--- old/src/hotspot/os/solaris/os_solaris.cpp 2020-05-01 02:29:37.836310404 -0700 +++ /dev/null 2020-03-09 18:57:19.455001459 -0700 @@ -1,5229 +0,0 @@ -/* - * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - * - */ - -// no precompiled headers -#include "jvm.h" -#include "classfile/classLoader.hpp" -#include "classfile/systemDictionary.hpp" -#include "classfile/vmSymbols.hpp" -#include "code/icBuffer.hpp" -#include "code/vtableStubs.hpp" -#include "compiler/compileBroker.hpp" -#include "compiler/disassembler.hpp" -#include "interpreter/interpreter.hpp" -#include "logging/log.hpp" -#include "logging/logStream.hpp" -#include "memory/allocation.inline.hpp" -#include "memory/filemap.hpp" -#include "memory/universe.hpp" -#include "oops/oop.inline.hpp" -#include "os_share_solaris.hpp" -#include "os_solaris.inline.hpp" -#include "prims/jniFastGetField.hpp" -#include "prims/jvm_misc.hpp" -#include "runtime/arguments.hpp" -#include "runtime/atomic.hpp" -#include "runtime/extendedPC.hpp" -#include "runtime/globals.hpp" -#include "runtime/interfaceSupport.inline.hpp" -#include "runtime/java.hpp" -#include "runtime/javaCalls.hpp" -#include "runtime/mutexLocker.hpp" -#include "runtime/objectMonitor.hpp" -#include "runtime/orderAccess.hpp" -#include "runtime/osThread.hpp" -#include "runtime/perfMemory.hpp" -#include "runtime/sharedRuntime.hpp" -#include "runtime/statSampler.hpp" -#include "runtime/stubRoutines.hpp" -#include "runtime/thread.inline.hpp" -#include "runtime/threadCritical.hpp" -#include "runtime/timer.hpp" -#include "runtime/vm_version.hpp" -#include "semaphore_posix.hpp" -#include "services/attachListener.hpp" -#include "services/memTracker.hpp" -#include "services/runtimeService.hpp" -#include "utilities/align.hpp" -#include "utilities/decoder.hpp" -#include "utilities/defaultStream.hpp" -#include "utilities/events.hpp" -#include "utilities/growableArray.hpp" -#include "utilities/macros.hpp" -#include "utilities/vmError.hpp" - -// put OS-includes here -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include // for elf Sym structure used by dladdr1 -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include -# include - -# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later -# include // see comment in - -#define MAX_PATH (2 * K) - -// for timer info max values which include all bits -#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) - - -// Here are some liblgrp types from sys/lgrp_user.h to be able to -// compile on older systems without this header file. - -#ifndef MADV_ACCESS_LWP - #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ -#endif -#ifndef MADV_ACCESS_MANY - #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ -#endif - -#ifndef LGRP_RSRC_CPU - #define LGRP_RSRC_CPU 0 /* CPU resources */ -#endif -#ifndef LGRP_RSRC_MEM - #define LGRP_RSRC_MEM 1 /* memory resources */ -#endif - -// Values for ThreadPriorityPolicy == 1 -int prio_policy1[CriticalPriority+1] = { - -99999, 0, 16, 32, 48, 64, - 80, 96, 112, 124, 127, 127 }; - -// System parameters used internally -static clock_t clock_tics_per_sec = 100; - -// Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) -static bool enabled_extended_FILE_stdio = false; - -// For diagnostics to print a message once. see run_periodic_checks -static bool check_addr0_done = false; -static sigset_t check_signal_done; -static bool check_signals = true; - -address os::Solaris::handler_start; // start pc of thr_sighndlrinfo -address os::Solaris::handler_end; // end pc of thr_sighndlrinfo - -address os::Solaris::_main_stack_base = NULL; // 4352906 workaround - -os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; - -// "default" initializers for missing libc APIs -extern "C" { - static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } - static int lwp_mutex_destroy(mutex_t *mx) { return 0; } - - static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } - static int lwp_cond_destroy(cond_t *cv) { return 0; } -} - -// "default" initializers for pthread-based synchronization -extern "C" { - static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } - static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } -} - -static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); - -static inline size_t adjust_stack_size(address base, size_t size) { - if ((ssize_t)size < 0) { - // 4759953: Compensate for ridiculous stack size. - size = max_intx; - } - if (size > (size_t)base) { - // 4812466: Make sure size doesn't allow the stack to wrap the address space. - size = (size_t)base; - } - return size; -} - -static inline stack_t get_stack_info() { - stack_t st; - int retval = thr_stksegment(&st); - st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); - assert(retval == 0, "incorrect return value from thr_stksegment"); - assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); - assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); - return st; -} - -static void _handle_uncaught_cxx_exception() { - VMError::report_and_die("An uncaught C++ exception"); -} - -bool os::is_primordial_thread(void) { - int r = thr_main(); - guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); - return r == 1; -} - -address os::current_stack_base() { - bool _is_primordial_thread = is_primordial_thread(); - - // Workaround 4352906, avoid calls to thr_stksegment by - // thr_main after the first one (it looks like we trash - // some data, causing the value for ss_sp to be incorrect). - if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) { - stack_t st = get_stack_info(); - if (_is_primordial_thread) { - // cache initial value of stack base - os::Solaris::_main_stack_base = (address)st.ss_sp; - } - return (address)st.ss_sp; - } else { - guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); - return os::Solaris::_main_stack_base; - } -} - -size_t os::current_stack_size() { - size_t size; - - if (!is_primordial_thread()) { - size = get_stack_info().ss_size; - } else { - struct rlimit limits; - getrlimit(RLIMIT_STACK, &limits); - size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); - } - // base may not be page aligned - address base = current_stack_base(); - address bottom = align_up(base - size, os::vm_page_size());; - return (size_t)(base - bottom); -} - -struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { - return localtime_r(clock, res); -} - -void os::Solaris::try_enable_extended_io() { - typedef int (*enable_extended_FILE_stdio_t)(int, int); - - if (!UseExtendedFileIO) { - return; - } - - enable_extended_FILE_stdio_t enabler = - (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, - "enable_extended_FILE_stdio"); - if (enabler) { - enabler(-1, -1); - } -} - -jint os::Solaris::_os_thread_limit = 0; -volatile jint os::Solaris::_os_thread_count = 0; - -julong os::available_memory() { - return Solaris::available_memory(); -} - -julong os::Solaris::available_memory() { - return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); -} - -julong os::Solaris::_physical_memory = 0; - -julong os::physical_memory() { - return Solaris::physical_memory(); -} - -static hrtime_t first_hrtime = 0; -static const hrtime_t hrtime_hz = 1000*1000*1000; -static volatile hrtime_t max_hrtime = 0; - - -void os::Solaris::initialize_system_info() { - set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); - _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * - (julong)sysconf(_SC_PAGESIZE); -} - -uint os::processor_id() { - const processorid_t id = ::getcpuid(); - assert(id >= 0 && id < _processor_count, "Invalid processor id"); - return (uint)id; -} - -int os::active_processor_count() { - // User has overridden the number of active processors - if (ActiveProcessorCount > 0) { - log_trace(os)("active_processor_count: " - "active processor count set by user : %d", - ActiveProcessorCount); - return ActiveProcessorCount; - } - - int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); - pid_t pid = getpid(); - psetid_t pset = PS_NONE; - // Are we running in a processor set or is there any processor set around? - if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { - uint_t pset_cpus; - // Query the number of cpus available to us. - if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { - assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); - return pset_cpus; - } - } - // Otherwise return number of online cpus - return online_cpus; -} - -void os::set_native_thread_name(const char *name) { - if (Solaris::_pthread_setname_np != NULL) { - // Only the first 31 bytes of 'name' are processed by pthread_setname_np - // but we explicitly copy into a size-limited buffer to avoid any - // possible overflow. - char buf[32]; - snprintf(buf, sizeof(buf), "%s", name); - buf[sizeof(buf) - 1] = '\0'; - Solaris::_pthread_setname_np(pthread_self(), buf); - } -} - -bool os::bind_to_processor(uint processor_id) { - // We assume that a processorid_t can be stored in a uint. - assert(sizeof(uint) == sizeof(processorid_t), - "can't convert uint to processorid_t"); - int bind_result = - processor_bind(P_LWPID, // bind LWP. - P_MYID, // bind current LWP. - (processorid_t) processor_id, // id. - NULL); // don't return old binding. - return (bind_result == 0); -} - -// Return true if user is running as root. - -bool os::have_special_privileges() { - static bool init = false; - static bool privileges = false; - if (!init) { - privileges = (getuid() != geteuid()) || (getgid() != getegid()); - init = true; - } - return privileges; -} - - -void os::init_system_properties_values() { - // The next steps are taken in the product version: - // - // Obtain the JAVA_HOME value from the location of libjvm.so. - // This library should be located at: - // /jre/lib//{client|server}/libjvm.so. - // - // If "/jre/lib/" appears at the right place in the path, then we - // assume libjvm.so is installed in a JDK and we use this path. - // - // Otherwise exit with message: "Could not create the Java virtual machine." - // - // The following extra steps are taken in the debugging version: - // - // If "/jre/lib/" does NOT appear at the right place in the path - // instead of exit check for $JAVA_HOME environment variable. - // - // If it is defined and we are able to locate $JAVA_HOME/jre/lib/, - // then we append a fake suffix "hotspot/libjvm.so" to this path so - // it looks like libjvm.so is installed there - // /jre/lib//hotspot/libjvm.so. - // - // Otherwise exit. - // - // Important note: if the location of libjvm.so changes this - // code needs to be changed accordingly. - -// Base path of extensions installed on the system. -#define SYS_EXT_DIR "/usr/jdk/packages" -#define EXTENSIONS_DIR "/lib/ext" - - // Buffer that fits several sprintfs. - // Note that the space for the colon and the trailing null are provided - // by the nulls included by the sizeof operator. - const size_t bufsize = - MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. - sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path - (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir - char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); - - // sysclasspath, java_home, dll_dir - { - char *pslash; - os::jvm_path(buf, bufsize); - - // Found the full path to libjvm.so. - // Now cut the path to /jre if we can. - *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. - pslash = strrchr(buf, '/'); - if (pslash != NULL) { - *pslash = '\0'; // Get rid of /{client|server|hotspot}. - } - Arguments::set_dll_dir(buf); - - if (pslash != NULL) { - pslash = strrchr(buf, '/'); - if (pslash != NULL) { - *pslash = '\0'; // Get rid of /lib. - } - } - Arguments::set_java_home(buf); - if (!set_boot_path('/', ':')) { - vm_exit_during_initialization("Failed setting boot class path.", NULL); - } - } - - // Where to look for native libraries. - { - // Use dlinfo() to determine the correct java.library.path. - // - // If we're launched by the Java launcher, and the user - // does not set java.library.path explicitly on the commandline, - // the Java launcher sets LD_LIBRARY_PATH for us and unsets - // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case - // dlinfo returns LD_LIBRARY_PATH + crle settings (including - // /usr/lib), which is exactly what we want. - // - // If the user does set java.library.path, it completely - // overwrites this setting, and always has. - // - // If we're not launched by the Java launcher, we may - // get here with any/all of the LD_LIBRARY_PATH[_32|64] - // settings. Again, dlinfo does exactly what we want. - - Dl_serinfo info_sz, *info = &info_sz; - Dl_serpath *path; - char *library_path; - char *common_path = buf; - - // Determine search path count and required buffer size. - if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { - FREE_C_HEAP_ARRAY(char, buf); - vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); - } - - // Allocate new buffer and initialize. - info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); - info->dls_size = info_sz.dls_size; - info->dls_cnt = info_sz.dls_cnt; - - // Obtain search path information. - if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { - FREE_C_HEAP_ARRAY(char, buf); - FREE_C_HEAP_ARRAY(char, info); - vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); - } - - path = &info->dls_serpath[0]; - - // Note: Due to a legacy implementation, most of the library path - // is set in the launcher. This was to accomodate linking restrictions - // on legacy Solaris implementations (which are no longer supported). - // Eventually, all the library path setting will be done here. - // - // However, to prevent the proliferation of improperly built native - // libraries, the new path component /usr/jdk/packages is added here. - - // Construct the invariant part of ld_library_path. - sprintf(common_path, SYS_EXT_DIR "/lib"); - - // Struct size is more than sufficient for the path components obtained - // through the dlinfo() call, so only add additional space for the path - // components explicitly added here. - size_t library_path_size = info->dls_size + strlen(common_path); - library_path = NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); - library_path[0] = '\0'; - - // Construct the desired Java library path from the linker's library - // search path. - // - // For compatibility, it is optimal that we insert the additional path - // components specific to the Java VM after those components specified - // in LD_LIBRARY_PATH (if any) but before those added by the ld.so - // infrastructure. - if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. - strcpy(library_path, common_path); - } else { - int inserted = 0; - int i; - for (i = 0; i < info->dls_cnt; i++, path++) { - uint_t flags = path->dls_flags & LA_SER_MASK; - if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { - strcat(library_path, common_path); - strcat(library_path, os::path_separator()); - inserted = 1; - } - strcat(library_path, path->dls_name); - strcat(library_path, os::path_separator()); - } - // Eliminate trailing path separator. - library_path[strlen(library_path)-1] = '\0'; - } - - // happens before argument parsing - can't use a trace flag - // tty->print_raw("init_system_properties_values: native lib path: "); - // tty->print_raw_cr(library_path); - - // Callee copies into its own buffer. - Arguments::set_library_path(library_path); - - FREE_C_HEAP_ARRAY(char, library_path); - FREE_C_HEAP_ARRAY(char, info); - } - - // Extensions directories. - sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); - Arguments::set_ext_dirs(buf); - - FREE_C_HEAP_ARRAY(char, buf); - -#undef SYS_EXT_DIR -#undef EXTENSIONS_DIR -} - -void os::breakpoint() { - BREAKPOINT; -} - -extern "C" void breakpoint() { - // use debugger to set breakpoint here -} - -static thread_t main_thread; - -// Thread start routine for all newly created threads -extern "C" void* thread_native_entry(void* thread_addr) { - - Thread* thread = (Thread*)thread_addr; - - thread->record_stack_base_and_size(); - - // Try to randomize the cache line index of hot stack frames. - // This helps when threads of the same stack traces evict each other's - // cache lines. The threads can be either from the same JVM instance, or - // from different JVM instances. The benefit is especially true for - // processors with hyperthreading technology. - static int counter = 0; - int pid = os::current_process_id(); - alloca(((pid ^ counter++) & 7) * 128); - - int prio; - - thread->initialize_thread_current(); - - OSThread* osthr = thread->osthread(); - - osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound - - log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", - os::current_thread_id()); - - if (UseNUMA) { - int lgrp_id = os::numa_get_group_id(); - if (lgrp_id != -1) { - thread->set_lgrp_id(lgrp_id); - } - } - - // Our priority was set when we were created, and stored in the - // osthread, but couldn't be passed through to our LWP until now. - // So read back the priority and set it again. - - if (osthr->thread_id() != -1) { - if (UseThreadPriorities) { - int prio = osthr->native_priority(); - if (ThreadPriorityVerbose) { - tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " - INTPTR_FORMAT ", setting priority: %d\n", - osthr->thread_id(), osthr->lwp_id(), prio); - } - os::set_native_priority(thread, prio); - } - } else if (ThreadPriorityVerbose) { - warning("Can't set priority in _start routine, thread id hasn't been set\n"); - } - - assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); - - // initialize signal mask for this thread - os::Solaris::hotspot_sigmask(thread); - - os::Solaris::init_thread_fpu_state(); - std::set_terminate(_handle_uncaught_cxx_exception); - - thread->call_run(); - - // Note: at this point the thread object may already have deleted itself. - // Do not dereference it from here on out. - - // One less thread is executing - // When the VMThread gets here, the main thread may have already exited - // which frees the CodeHeap containing the Atomic::dec code - if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { - Atomic::dec(&os::Solaris::_os_thread_count); - } - - log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); - - if (UseDetachedThreads) { - thr_exit(NULL); - ShouldNotReachHere(); - } - return NULL; -} - -static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { - // Allocate the OSThread object - OSThread* osthread = new OSThread(NULL, NULL); - if (osthread == NULL) return NULL; - - // Store info on the Solaris thread into the OSThread - osthread->set_thread_id(thread_id); - osthread->set_lwp_id(_lwp_self()); - - if (UseNUMA) { - int lgrp_id = os::numa_get_group_id(); - if (lgrp_id != -1) { - thread->set_lgrp_id(lgrp_id); - } - } - - if (ThreadPriorityVerbose) { - tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", - osthread->thread_id(), osthread->lwp_id()); - } - - // Initial thread state is INITIALIZED, not SUSPENDED - osthread->set_state(INITIALIZED); - - return osthread; -} - -void os::Solaris::hotspot_sigmask(Thread* thread) { - //Save caller's signal mask - sigset_t sigmask; - pthread_sigmask(SIG_SETMASK, NULL, &sigmask); - OSThread *osthread = thread->osthread(); - osthread->set_caller_sigmask(sigmask); - - pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); - if (!ReduceSignalUsage) { - if (thread->is_VM_thread()) { - // Only the VM thread handles BREAK_SIGNAL ... - pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); - } else { - // ... all other threads block BREAK_SIGNAL - assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); - pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); - } - } -} - -bool os::create_attached_thread(JavaThread* thread) { -#ifdef ASSERT - thread->verify_not_published(); -#endif - OSThread* osthread = create_os_thread(thread, thr_self()); - if (osthread == NULL) { - return false; - } - - // Initial thread state is RUNNABLE - osthread->set_state(RUNNABLE); - thread->set_osthread(osthread); - - // initialize signal mask for this thread - // and save the caller's signal mask - os::Solaris::hotspot_sigmask(thread); - - log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", - os::current_thread_id()); - - return true; -} - -bool os::create_main_thread(JavaThread* thread) { -#ifdef ASSERT - thread->verify_not_published(); -#endif - if (_starting_thread == NULL) { - _starting_thread = create_os_thread(thread, main_thread); - if (_starting_thread == NULL) { - return false; - } - } - - // The primodial thread is runnable from the start - _starting_thread->set_state(RUNNABLE); - - thread->set_osthread(_starting_thread); - - // initialize signal mask for this thread - // and save the caller's signal mask - os::Solaris::hotspot_sigmask(thread); - - return true; -} - -// Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() -static char* describe_thr_create_attributes(char* buf, size_t buflen, - size_t stacksize, long flags) { - stringStream ss(buf, buflen); - ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); - ss.print("flags: "); - #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); - #define ALL(X) \ - X(THR_SUSPENDED) \ - X(THR_DETACHED) \ - X(THR_BOUND) \ - X(THR_NEW_LWP) \ - X(THR_DAEMON) - ALL(PRINT_FLAG) - #undef ALL - #undef PRINT_FLAG - return buf; -} - -// return default stack size for thr_type -size_t os::Posix::default_stack_size(os::ThreadType thr_type) { - // default stack size when not specified by caller is 1M (2M for LP64) - size_t s = (BytesPerWord >> 2) * K * K; - return s; -} - -bool os::create_thread(Thread* thread, ThreadType thr_type, - size_t req_stack_size) { - // Allocate the OSThread object - OSThread* osthread = new OSThread(NULL, NULL); - if (osthread == NULL) { - return false; - } - - if (ThreadPriorityVerbose) { - char *thrtyp; - switch (thr_type) { - case vm_thread: - thrtyp = (char *)"vm"; - break; - case cgc_thread: - thrtyp = (char *)"cgc"; - break; - case pgc_thread: - thrtyp = (char *)"pgc"; - break; - case java_thread: - thrtyp = (char *)"java"; - break; - case compiler_thread: - thrtyp = (char *)"compiler"; - break; - case watcher_thread: - thrtyp = (char *)"watcher"; - break; - default: - thrtyp = (char *)"unknown"; - break; - } - tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); - } - - // calculate stack size if it's not specified by caller - size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); - - // Initial state is ALLOCATED but not INITIALIZED - osthread->set_state(ALLOCATED); - - if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { - // We got lots of threads. Check if we still have some address space left. - // Need to be at least 5Mb of unreserved address space. We do check by - // trying to reserve some. - const size_t VirtualMemoryBangSize = 20*K*K; - char* mem = os::reserve_memory(VirtualMemoryBangSize); - if (mem == NULL) { - delete osthread; - return false; - } else { - // Release the memory again - os::release_memory(mem, VirtualMemoryBangSize); - } - } - - // Setup osthread because the child thread may need it. - thread->set_osthread(osthread); - - // Create the Solaris thread - thread_t tid = 0; - long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; - int status; - - // Mark that we don't have an lwp or thread id yet. - // In case we attempt to set the priority before the thread starts. - osthread->set_lwp_id(-1); - osthread->set_thread_id(-1); - - status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); - - char buf[64]; - if (status == 0) { - log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", - (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); - } else { - log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", - os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); - // Log some OS information which might explain why creating the thread failed. - log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); - LogStream st(Log(os, thread)::info()); - os::Posix::print_rlimit_info(&st); - os::print_memory_info(&st); - } - - if (status != 0) { - thread->set_osthread(NULL); - // Need to clean up stuff we've allocated so far - delete osthread; - return false; - } - - Atomic::inc(&os::Solaris::_os_thread_count); - - // Store info on the Solaris thread into the OSThread - osthread->set_thread_id(tid); - - // Remember that we created this thread so we can set priority on it - osthread->set_vm_created(); - - // Most thread types will set an explicit priority before starting the thread, - // but for those that don't we need a valid value to read back in thread_native_entry. - osthread->set_native_priority(NormPriority); - - // Initial thread state is INITIALIZED, not SUSPENDED - osthread->set_state(INITIALIZED); - - // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain - return true; -} - -debug_only(static bool signal_sets_initialized = false); -static sigset_t unblocked_sigs, vm_sigs; - -void os::Solaris::signal_sets_init() { - // Should also have an assertion stating we are still single-threaded. - assert(!signal_sets_initialized, "Already initialized"); - // Fill in signals that are necessarily unblocked for all threads in - // the VM. Currently, we unblock the following signals: - // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden - // by -Xrs (=ReduceSignalUsage)); - // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all - // other threads. The "ReduceSignalUsage" boolean tells us not to alter - // the dispositions or masks wrt these signals. - // Programs embedding the VM that want to use the above signals for their - // own purposes must, at this time, use the "-Xrs" option to prevent - // interference with shutdown hooks and BREAK_SIGNAL thread dumping. - // (See bug 4345157, and other related bugs). - // In reality, though, unblocking these signals is really a nop, since - // these signals are not blocked by default. - sigemptyset(&unblocked_sigs); - sigaddset(&unblocked_sigs, SIGILL); - sigaddset(&unblocked_sigs, SIGSEGV); - sigaddset(&unblocked_sigs, SIGBUS); - sigaddset(&unblocked_sigs, SIGFPE); - sigaddset(&unblocked_sigs, ASYNC_SIGNAL); - - if (!ReduceSignalUsage) { - if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { - sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); - } - if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { - sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); - } - if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { - sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); - } - } - // Fill in signals that are blocked by all but the VM thread. - sigemptyset(&vm_sigs); - if (!ReduceSignalUsage) { - sigaddset(&vm_sigs, BREAK_SIGNAL); - } - debug_only(signal_sets_initialized = true); - - // For diagnostics only used in run_periodic_checks - sigemptyset(&check_signal_done); -} - -// These are signals that are unblocked while a thread is running Java. -// (For some reason, they get blocked by default.) -sigset_t* os::Solaris::unblocked_signals() { - assert(signal_sets_initialized, "Not initialized"); - return &unblocked_sigs; -} - -// These are the signals that are blocked while a (non-VM) thread is -// running Java. Only the VM thread handles these signals. -sigset_t* os::Solaris::vm_signals() { - assert(signal_sets_initialized, "Not initialized"); - return &vm_sigs; -} - -// CR 7190089: on Solaris, primordial thread's stack needs adjusting. -// Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited). -void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) { - assert(is_primordial_thread(), "Call only for primordial thread"); - - JavaThread* jt = (JavaThread *)thr; - assert(jt != NULL, "Sanity check"); - size_t stack_size; - address base = jt->stack_base(); - if (Arguments::created_by_java_launcher()) { - // Use 2MB to allow for Solaris 7 64 bit mode. - stack_size = JavaThread::stack_size_at_create() == 0 - ? 2048*K : JavaThread::stack_size_at_create(); - - // There are rare cases when we may have already used more than - // the basic stack size allotment before this method is invoked. - // Attempt to allow for a normally sized java_stack. - size_t current_stack_offset = (size_t)(base - (address)&stack_size); - stack_size += ReservedSpace::page_align_size_down(current_stack_offset); - } else { - // 6269555: If we were not created by a Java launcher, i.e. if we are - // running embedded in a native application, treat the primordial thread - // as much like a native attached thread as possible. This means using - // the current stack size from thr_stksegment(), unless it is too large - // to reliably setup guard pages. A reasonable max size is 8MB. - size_t current_size = os::current_stack_size(); - // This should never happen, but just in case.... - if (current_size == 0) current_size = 2 * K * K; - stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; - } - address bottom = align_up(base - stack_size, os::vm_page_size());; - stack_size = (size_t)(base - bottom); - - assert(stack_size > 0, "Stack size calculation problem"); - - if (stack_size > jt->stack_size()) { -#ifndef PRODUCT - struct rlimit limits; - getrlimit(RLIMIT_STACK, &limits); - size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); - assert(size >= jt->stack_size(), "Stack size problem in main thread"); -#endif - tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" - "(Stack sizes are rounded up to a multiple of the system page size.)\n" - "See limit(1) to increase the stack size limit.", - stack_size / K, jt->stack_size() / K); - vm_exit(1); - } - assert(jt->stack_size() >= stack_size, - "Attempt to map more stack than was allocated"); - jt->set_stack_size(stack_size); - -} - - - -// Free Solaris resources related to the OSThread -void os::free_thread(OSThread* osthread) { - assert(osthread != NULL, "os::free_thread but osthread not set"); - - // We are told to free resources of the argument thread, - // but we can only really operate on the current thread. - assert(Thread::current()->osthread() == osthread, - "os::free_thread but not current thread"); - - // Restore caller's signal mask - sigset_t sigmask = osthread->caller_sigmask(); - pthread_sigmask(SIG_SETMASK, &sigmask, NULL); - - delete osthread; -} - -void os::pd_start_thread(Thread* thread) { - int status = thr_continue(thread->osthread()->thread_id()); - assert_status(status == 0, status, "thr_continue failed"); -} - - -intx os::current_thread_id() { - return (intx)thr_self(); -} - -static pid_t _initial_pid = 0; - -int os::current_process_id() { - return (int)(_initial_pid ? _initial_pid : getpid()); -} - -// gethrtime() should be monotonic according to the documentation, -// but some virtualized platforms are known to break this guarantee. -// getTimeNanos() must be guaranteed not to move backwards, so we -// are forced to add a check here. -inline hrtime_t getTimeNanos() { - const hrtime_t now = gethrtime(); - const hrtime_t prev = max_hrtime; - if (now <= prev) { - return prev; // same or retrograde time; - } - const hrtime_t obsv = Atomic::cmpxchg(&max_hrtime, prev, now); - assert(obsv >= prev, "invariant"); // Monotonicity - // If the CAS succeeded then we're done and return "now". - // If the CAS failed and the observed value "obsv" is >= now then - // we should return "obsv". If the CAS failed and now > obsv > prv then - // some other thread raced this thread and installed a new value, in which case - // we could either (a) retry the entire operation, (b) retry trying to install now - // or (c) just return obsv. We use (c). No loop is required although in some cases - // we might discard a higher "now" value in deference to a slightly lower but freshly - // installed obsv value. That's entirely benign -- it admits no new orderings compared - // to (a) or (b) -- and greatly reduces coherence traffic. - // We might also condition (c) on the magnitude of the delta between obsv and now. - // Avoiding excessive CAS operations to hot RW locations is critical. - // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate - return (prev == obsv) ? now : obsv; -} - -// Time since start-up in seconds to a fine granularity. -// Used by VMSelfDestructTimer and the MemProfiler. -double os::elapsedTime() { - return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; -} - -jlong os::elapsed_counter() { - return (jlong)(getTimeNanos() - first_hrtime); -} - -jlong os::elapsed_frequency() { - return hrtime_hz; -} - -// Return the real, user, and system times in seconds from an -// arbitrary fixed point in the past. -bool os::getTimesSecs(double* process_real_time, - double* process_user_time, - double* process_system_time) { - struct tms ticks; - clock_t real_ticks = times(&ticks); - - if (real_ticks == (clock_t) (-1)) { - return false; - } else { - double ticks_per_second = (double) clock_tics_per_sec; - *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; - *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; - // For consistency return the real time from getTimeNanos() - // converted to seconds. - *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); - - return true; - } -} - -bool os::supports_vtime() { return true; } - -double os::elapsedVTime() { - return (double)gethrvtime() / (double)hrtime_hz; -} - -// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis -jlong os::javaTimeMillis() { - timeval t; - if (gettimeofday(&t, NULL) == -1) { - fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); - } - return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; -} - -// Must return seconds+nanos since Jan 1 1970. This must use the same -// time source as javaTimeMillis and can't use get_nsec_fromepoch as -// we need better than 1ms accuracy -void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { - timeval t; - if (gettimeofday(&t, NULL) == -1) { - fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); - } - seconds = jlong(t.tv_sec); - nanos = jlong(t.tv_usec) * 1000; -} - - -jlong os::javaTimeNanos() { - return (jlong)getTimeNanos(); -} - -void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { - info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits - info_ptr->may_skip_backward = false; // not subject to resetting or drifting - info_ptr->may_skip_forward = false; // not subject to resetting or drifting - info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time -} - -char * os::local_time_string(char *buf, size_t buflen) { - struct tm t; - time_t long_time; - time(&long_time); - localtime_r(&long_time, &t); - jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", - t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, - t.tm_hour, t.tm_min, t.tm_sec); - return buf; -} - -// Note: os::shutdown() might be called very early during initialization, or -// called from signal handler. Before adding something to os::shutdown(), make -// sure it is async-safe and can handle partially initialized VM. -void os::shutdown() { - - // allow PerfMemory to attempt cleanup of any persistent resources - perfMemory_exit(); - - // needs to remove object in file system - AttachListener::abort(); - - // flush buffered output, finish log files - ostream_abort(); - - // Check for abort hook - abort_hook_t abort_hook = Arguments::abort_hook(); - if (abort_hook != NULL) { - abort_hook(); - } -} - -// Note: os::abort() might be called very early during initialization, or -// called from signal handler. Before adding something to os::abort(), make -// sure it is async-safe and can handle partially initialized VM. -void os::abort(bool dump_core, void* siginfo, const void* context) { - os::shutdown(); - if (dump_core) { -#ifndef PRODUCT - fdStream out(defaultStream::output_fd()); - out.print_raw("Current thread is "); - char buf[16]; - jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); - out.print_raw_cr(buf); - out.print_raw_cr("Dumping core ..."); -#endif - ::abort(); // dump core (for debugging) - } - - ::exit(1); -} - -// Die immediately, no exit hook, no abort hook, no cleanup. -// Dump a core file, if possible, for debugging. -void os::die() { - if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { - // For TimeoutInErrorHandlingTest.java, we just kill the VM - // and don't take the time to generate a core file. - os::signal_raise(SIGKILL); - } else { - ::abort(); - } -} - -// DLL functions - -const char* os::dll_file_extension() { return ".so"; } - -// This must be hard coded because it's the system's temporary -// directory not the java application's temp directory, ala java.io.tmpdir. -const char* os::get_temp_directory() { return "/tmp"; } - -// check if addr is inside libjvm.so -bool os::address_is_in_vm(address addr) { - static address libjvm_base_addr; - Dl_info dlinfo; - - if (libjvm_base_addr == NULL) { - if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { - libjvm_base_addr = (address)dlinfo.dli_fbase; - } - assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); - } - - if (dladdr((void *)addr, &dlinfo) != 0) { - if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; - } - - return false; -} - -typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); -static dladdr1_func_type dladdr1_func = NULL; - -bool os::dll_address_to_function_name(address addr, char *buf, - int buflen, int * offset, - bool demangle) { - // buf is not optional, but offset is optional - assert(buf != NULL, "sanity check"); - - Dl_info dlinfo; - - // dladdr1_func was initialized in os::init() - if (dladdr1_func != NULL) { - // yes, we have dladdr1 - - // Support for dladdr1 is checked at runtime; it may be - // available even if the vm is built on a machine that does - // not have dladdr1 support. Make sure there is a value for - // RTLD_DL_SYMENT. -#ifndef RTLD_DL_SYMENT - #define RTLD_DL_SYMENT 1 -#endif -#ifdef _LP64 - Elf64_Sym * info; -#else - Elf32_Sym * info; -#endif - if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, - RTLD_DL_SYMENT) != 0) { - // see if we have a matching symbol that covers our address - if (dlinfo.dli_saddr != NULL && - (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { - if (dlinfo.dli_sname != NULL) { - if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { - jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); - } - if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; - return true; - } - } - // no matching symbol so try for just file info - if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { - if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), - buf, buflen, offset, dlinfo.dli_fname, demangle)) { - return true; - } - } - } - buf[0] = '\0'; - if (offset != NULL) *offset = -1; - return false; - } - - // no, only dladdr is available - if (dladdr((void *)addr, &dlinfo) != 0) { - // see if we have a matching symbol - if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { - if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { - jio_snprintf(buf, buflen, dlinfo.dli_sname); - } - if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; - return true; - } - // no matching symbol so try for just file info - if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { - if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), - buf, buflen, offset, dlinfo.dli_fname, demangle)) { - return true; - } - } - } - buf[0] = '\0'; - if (offset != NULL) *offset = -1; - return false; -} - -bool os::dll_address_to_library_name(address addr, char* buf, - int buflen, int* offset) { - // buf is not optional, but offset is optional - assert(buf != NULL, "sanity check"); - - Dl_info dlinfo; - - if (dladdr((void*)addr, &dlinfo) != 0) { - if (dlinfo.dli_fname != NULL) { - jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); - } - if (dlinfo.dli_fbase != NULL && offset != NULL) { - *offset = addr - (address)dlinfo.dli_fbase; - } - return true; - } - - buf[0] = '\0'; - if (offset) *offset = -1; - return false; -} - -int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { - Dl_info dli; - // Sanity check? - if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || - dli.dli_fname == NULL) { - return 1; - } - - void * handle = dlopen(dli.dli_fname, RTLD_LAZY); - if (handle == NULL) { - return 1; - } - - Link_map *map; - dlinfo(handle, RTLD_DI_LINKMAP, &map); - if (map == NULL) { - dlclose(handle); - return 1; - } - - while (map->l_prev != NULL) { - map = map->l_prev; - } - - while (map != NULL) { - // Iterate through all map entries and call callback with fields of interest - if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { - dlclose(handle); - return 1; - } - map = map->l_next; - } - - dlclose(handle); - return 0; -} - -int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { - outputStream * out = (outputStream *) param; - out->print_cr(PTR_FORMAT " \t%s", base_address, name); - return 0; -} - -void os::print_dll_info(outputStream * st) { - st->print_cr("Dynamic libraries:"); st->flush(); - if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { - st->print_cr("Error: Cannot print dynamic libraries."); - } -} - -static void change_endianness(Elf32_Half& val) { - unsigned char *ptr = (unsigned char *)&val; - unsigned char swp = ptr[0]; - ptr[0] = ptr[1]; - ptr[1] = swp; -} - -// Loads .dll/.so and -// in case of error it checks if .dll/.so was built for the -// same architecture as Hotspot is running on - -void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { - log_info(os)("attempting shared library load of %s", filename); - - void * result= ::dlopen(filename, RTLD_LAZY); - if (result != NULL) { - // Successful loading - Events::log(NULL, "Loaded shared library %s", filename); - log_info(os)("shared library load of %s was successful", filename); - return result; - } - - Elf32_Ehdr elf_head; - const char* error_report = ::dlerror(); - if (error_report == NULL) { - error_report = "dlerror returned no error description"; - } - if (ebuf != NULL && ebuflen > 0) { - ::strncpy(ebuf, error_report, ebuflen-1); - ebuf[ebuflen-1]='\0'; - } - - Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); - log_info(os)("shared library load of %s failed, %s", filename, error_report); - - int diag_msg_max_length=ebuflen-strlen(ebuf); - char* diag_msg_buf=ebuf+strlen(ebuf); - - if (diag_msg_max_length==0) { - // No more space in ebuf for additional diagnostics message - return NULL; - } - - - int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); - - if (file_descriptor < 0) { - // Can't open library, report dlerror() message - return NULL; - } - - bool failed_to_read_elf_head= - (sizeof(elf_head)!= - (::read(file_descriptor, &elf_head,sizeof(elf_head)))); - - ::close(file_descriptor); - if (failed_to_read_elf_head) { - // file i/o error - report dlerror() msg - return NULL; - } - - if (elf_head.e_ident[EI_DATA] != LITTLE_ENDIAN_ONLY(ELFDATA2LSB) BIG_ENDIAN_ONLY(ELFDATA2MSB)) { - // handle invalid/out of range endianness values - if (elf_head.e_ident[EI_DATA] == 0 || elf_head.e_ident[EI_DATA] > 2) { - return NULL; - } - change_endianness(elf_head.e_machine); - } - - typedef struct { - Elf32_Half code; // Actual value as defined in elf.h - Elf32_Half compat_class; // Compatibility of archs at VM's sense - unsigned char elf_class; // 32 or 64 bit - unsigned char endianess; // MSB or LSB - char* name; // String representation - } arch_t; - - static const arch_t arch_array[]={ - {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, - {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, - {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, - {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, - {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, - {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, - {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, - {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, - {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, - {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, - // we only support 64 bit z architecture - {EM_S390, EM_S390, ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"}, - {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"} - }; - -#if (defined IA32) - static Elf32_Half running_arch_code=EM_386; -#elif (defined AMD64) - static Elf32_Half running_arch_code=EM_X86_64; -#elif (defined IA64) - static Elf32_Half running_arch_code=EM_IA_64; -#elif (defined __sparc) && (defined _LP64) - static Elf32_Half running_arch_code=EM_SPARCV9; -#elif (defined __sparc) && (!defined _LP64) - static Elf32_Half running_arch_code=EM_SPARC; -#elif (defined __powerpc64__) - static Elf32_Half running_arch_code=EM_PPC64; -#elif (defined __powerpc__) - static Elf32_Half running_arch_code=EM_PPC; -#elif (defined ARM) - static Elf32_Half running_arch_code=EM_ARM; -#else - #error Method os::dll_load requires that one of following is defined:\ - IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM -#endif - - // Identify compatibility class for VM's architecture and library's architecture - // Obtain string descriptions for architectures - - arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; - int running_arch_index=-1; - - for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { - if (running_arch_code == arch_array[i].code) { - running_arch_index = i; - } - if (lib_arch.code == arch_array[i].code) { - lib_arch.compat_class = arch_array[i].compat_class; - lib_arch.name = arch_array[i].name; - } - } - - assert(running_arch_index != -1, - "Didn't find running architecture code (running_arch_code) in arch_array"); - if (running_arch_index == -1) { - // Even though running architecture detection failed - // we may still continue with reporting dlerror() message - return NULL; - } - - if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { - if (lib_arch.name != NULL) { - ::snprintf(diag_msg_buf, diag_msg_max_length-1, - " (Possible cause: can't load %s .so on a %s platform)", - lib_arch.name, arch_array[running_arch_index].name); - } else { - ::snprintf(diag_msg_buf, diag_msg_max_length-1, - " (Possible cause: can't load this .so (machine code=0x%x) on a %s platform)", - lib_arch.code, arch_array[running_arch_index].name); - } - return NULL; - } - - if (lib_arch.endianess != arch_array[running_arch_index].endianess) { - ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); - return NULL; - } - - // ELF file class/capacity : 0 - invalid, 1 - 32bit, 2 - 64bit - if (lib_arch.elf_class > 2 || lib_arch.elf_class < 1) { - ::snprintf(diag_msg_buf, diag_msg_max_length-1, " (Possible cause: invalid ELF file class)"); - return NULL; - } - - if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { - ::snprintf(diag_msg_buf, diag_msg_max_length-1, - " (Possible cause: architecture word width mismatch, can't load %d-bit .so on a %d-bit platform)", - (int) lib_arch.elf_class * 32, arch_array[running_arch_index].elf_class * 32); - return NULL; - } - - return NULL; -} - -void* os::dll_lookup(void* handle, const char* name) { - return dlsym(handle, name); -} - -void* os::get_default_process_handle() { - return (void*)::dlopen(NULL, RTLD_LAZY); -} - -static inline time_t get_mtime(const char* filename) { - struct stat st; - int ret = os::stat(filename, &st); - assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); - return st.st_mtime; -} - -int os::compare_file_modified_times(const char* file1, const char* file2) { - time_t t1 = get_mtime(file1); - time_t t2 = get_mtime(file2); - return t1 - t2; -} - -static bool _print_ascii_file(const char* filename, outputStream* st) { - int fd = ::open(filename, O_RDONLY); - if (fd == -1) { - return false; - } - - char buf[32]; - int bytes; - while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { - st->print_raw(buf, bytes); - } - - ::close(fd); - - return true; -} - -void os::print_os_info_brief(outputStream* st) { - os::Solaris::print_distro_info(st); - - os::Posix::print_uname_info(st); - - os::Solaris::print_libversion_info(st); -} - -void os::print_os_info(outputStream* st) { - st->print("OS:"); - - os::Solaris::print_distro_info(st); - - os::Posix::print_uname_info(st); - - os::Posix::print_uptime_info(st); - - os::Solaris::print_libversion_info(st); - - os::Posix::print_rlimit_info(st); - - os::Posix::print_load_average(st); -} - -void os::Solaris::print_distro_info(outputStream* st) { - if (!_print_ascii_file("/etc/release", st)) { - st->print("Solaris"); - } - st->cr(); -} - -void os::get_summary_os_info(char* buf, size_t buflen) { - strncpy(buf, "Solaris", buflen); // default to plain solaris - FILE* fp = fopen("/etc/release", "r"); - if (fp != NULL) { - char tmp[256]; - // Only get the first line and chop out everything but the os name. - if (fgets(tmp, sizeof(tmp), fp)) { - char* ptr = tmp; - // skip past whitespace characters - while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; - if (*ptr != '\0') { - char* nl = strchr(ptr, '\n'); - if (nl != NULL) *nl = '\0'; - strncpy(buf, ptr, buflen); - } - } - fclose(fp); - } -} - -void os::Solaris::print_libversion_info(outputStream* st) { - st->print(" (T2 libthread)"); - st->cr(); -} - -static bool check_addr0(outputStream* st) { - jboolean status = false; - const int read_chunk = 200; - int ret = 0; - int nmap = 0; - int fd = ::open("/proc/self/map",O_RDONLY); - if (fd >= 0) { - prmap_t *p = NULL; - char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); - if (NULL == mbuff) { - ::close(fd); - return status; - } - while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { - //check if read() has not read partial data - if( 0 != ret % sizeof(prmap_t)){ - break; - } - nmap = ret / sizeof(prmap_t); - p = (prmap_t *)mbuff; - for(int i = 0; i < nmap; i++){ - if (p->pr_vaddr == 0x0) { - st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); - st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); - st->print("Access: "); - st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); - st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); - st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); - st->cr(); - status = true; - } - p++; - } - } - free(mbuff); - ::close(fd); - } - return status; -} - -void os::get_summary_cpu_info(char* buf, size_t buflen) { - // Get MHz with system call. We don't seem to already have this. - processor_info_t stats; - processorid_t id = getcpuid(); - int clock = 0; - if (processor_info(id, &stats) != -1) { - clock = stats.pi_clock; // pi_processor_type isn't more informative than below - } -#ifdef AMD64 - snprintf(buf, buflen, "x86 64 bit %d MHz", clock); -#else - // must be sparc - snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); -#endif -} - -void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { - // Nothing to do for now. -} - -void os::print_memory_info(outputStream* st) { - st->print("Memory:"); - st->print(" %dk page", os::vm_page_size()>>10); - st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); - st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); - st->cr(); - (void) check_addr0(st); -} - -// Moved from whole group, because we need them here for diagnostic -// prints. -static int Maxsignum = 0; -static int *ourSigFlags = NULL; - -int os::Solaris::get_our_sigflags(int sig) { - assert(ourSigFlags!=NULL, "signal data structure not initialized"); - assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); - return ourSigFlags[sig]; -} - -void os::Solaris::set_our_sigflags(int sig, int flags) { - assert(ourSigFlags!=NULL, "signal data structure not initialized"); - assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); - ourSigFlags[sig] = flags; -} - - -static const char* get_signal_handler_name(address handler, - char* buf, int buflen) { - int offset; - bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); - if (found) { - // skip directory names - const char *p1, *p2; - p1 = buf; - size_t len = strlen(os::file_separator()); - while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; - jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); - } else { - jio_snprintf(buf, buflen, PTR_FORMAT, handler); - } - return buf; -} - -static void print_signal_handler(outputStream* st, int sig, - char* buf, size_t buflen) { - struct sigaction sa; - - sigaction(sig, NULL, &sa); - - st->print("%s: ", os::exception_name(sig, buf, buflen)); - - address handler = (sa.sa_flags & SA_SIGINFO) - ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) - : CAST_FROM_FN_PTR(address, sa.sa_handler); - - if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { - st->print("SIG_DFL"); - } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { - st->print("SIG_IGN"); - } else { - st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); - } - - st->print(", sa_mask[0]="); - os::Posix::print_signal_set_short(st, &sa.sa_mask); - - address rh = VMError::get_resetted_sighandler(sig); - // May be, handler was resetted by VMError? - if (rh != NULL) { - handler = rh; - sa.sa_flags = VMError::get_resetted_sigflags(sig); - } - - st->print(", sa_flags="); - os::Posix::print_sa_flags(st, sa.sa_flags); - - // Check: is it our handler? - if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { - // It is our signal handler - // check for flags - if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { - st->print( - ", flags was changed from " PTR32_FORMAT ", consider using jsig library", - os::Solaris::get_our_sigflags(sig)); - } - } - st->cr(); -} - -void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { - st->print_cr("Signal Handlers:"); - print_signal_handler(st, SIGSEGV, buf, buflen); - print_signal_handler(st, SIGBUS , buf, buflen); - print_signal_handler(st, SIGFPE , buf, buflen); - print_signal_handler(st, SIGPIPE, buf, buflen); - print_signal_handler(st, SIGXFSZ, buf, buflen); - print_signal_handler(st, SIGILL , buf, buflen); - print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); - print_signal_handler(st, BREAK_SIGNAL, buf, buflen); - print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); - print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); - print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); -} - -static char saved_jvm_path[MAXPATHLEN] = { 0 }; - -// Find the full path to the current module, libjvm.so -void os::jvm_path(char *buf, jint buflen) { - // Error checking. - if (buflen < MAXPATHLEN) { - assert(false, "must use a large-enough buffer"); - buf[0] = '\0'; - return; - } - // Lazy resolve the path to current module. - if (saved_jvm_path[0] != 0) { - strcpy(buf, saved_jvm_path); - return; - } - - Dl_info dlinfo; - int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); - assert(ret != 0, "cannot locate libjvm"); - if (ret != 0 && dlinfo.dli_fname != NULL) { - if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { - return; - } - } else { - buf[0] = '\0'; - return; - } - - if (Arguments::sun_java_launcher_is_altjvm()) { - // Support for the java launcher's '-XXaltjvm=' option. Typical - // value for buf is "/jre/lib///libjvm.so". - // If "/jre/lib/" appears at the right place in the string, then - // assume we are installed in a JDK and we're done. Otherwise, check - // for a JAVA_HOME environment variable and fix up the path so it - // looks like libjvm.so is installed there (append a fake suffix - // hotspot/libjvm.so). - const char *p = buf + strlen(buf) - 1; - for (int count = 0; p > buf && count < 5; ++count) { - for (--p; p > buf && *p != '/'; --p) - /* empty */ ; - } - - if (strncmp(p, "/jre/lib/", 9) != 0) { - // Look for JAVA_HOME in the environment. - char* java_home_var = ::getenv("JAVA_HOME"); - if (java_home_var != NULL && java_home_var[0] != 0) { - char* jrelib_p; - int len; - - // Check the current module name "libjvm.so". - p = strrchr(buf, '/'); - assert(strstr(p, "/libjvm") == p, "invalid library name"); - - if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { - return; - } - // determine if this is a legacy image or modules image - // modules image doesn't have "jre" subdirectory - len = strlen(buf); - assert(len < buflen, "Ran out of buffer space"); - jrelib_p = buf + len; - snprintf(jrelib_p, buflen-len, "/jre/lib"); - if (0 != access(buf, F_OK)) { - snprintf(jrelib_p, buflen-len, "/lib"); - } - - if (0 == access(buf, F_OK)) { - // Use current module name "libjvm.so" - len = strlen(buf); - snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); - } else { - // Go back to path of .so - if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { - return; - } - } - } - } - } - - strncpy(saved_jvm_path, buf, MAXPATHLEN); - saved_jvm_path[MAXPATHLEN - 1] = '\0'; -} - - -void os::print_jni_name_prefix_on(outputStream* st, int args_size) { - // no prefix required, not even "_" -} - - -void os::print_jni_name_suffix_on(outputStream* st, int args_size) { - // no suffix required -} - -// sun.misc.Signal - -extern "C" { - static void UserHandler(int sig, void *siginfo, void *context) { - // Ctrl-C is pressed during error reporting, likely because the error - // handler fails to abort. Let VM die immediately. - if (sig == SIGINT && VMError::is_error_reported()) { - os::die(); - } - - os::signal_notify(sig); - // We do not need to reinstate the signal handler each time... - } -} - -void* os::user_handler() { - return CAST_FROM_FN_PTR(void*, UserHandler); -} - -extern "C" { - typedef void (*sa_handler_t)(int); - typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); -} - -void* os::signal(int signal_number, void* handler) { - struct sigaction sigAct, oldSigAct; - sigfillset(&(sigAct.sa_mask)); - sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; - sigAct.sa_flags |= SA_SIGINFO; - sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); - - if (sigaction(signal_number, &sigAct, &oldSigAct)) { - // -1 means registration failed - return (void *)-1; - } - - return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); -} - -void os::signal_raise(int signal_number) { - raise(signal_number); -} - -// The following code is moved from os.cpp for making this -// code platform specific, which it is by its very nature. - -// a counter for each possible signal value -static int Sigexit = 0; -static jint *pending_signals = NULL; -static int *preinstalled_sigs = NULL; -static struct sigaction *chainedsigactions = NULL; -static Semaphore* sig_sem = NULL; - -int os::sigexitnum_pd() { - assert(Sigexit > 0, "signal memory not yet initialized"); - return Sigexit; -} - -void os::Solaris::init_signal_mem() { - // Initialize signal structures - Maxsignum = SIGRTMAX; - Sigexit = Maxsignum+1; - assert(Maxsignum >0, "Unable to obtain max signal number"); - - // Initialize signal structures - // pending_signals has one int per signal - // The additional signal is for SIGEXIT - exit signal to signal_thread - pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); - memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); - - if (UseSignalChaining) { - chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) - * (Maxsignum + 1), mtInternal); - memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); - preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); - memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); - } - ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); - memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); -} - -static void jdk_misc_signal_init() { - // Initialize signal semaphore - sig_sem = new Semaphore(); -} - -void os::signal_notify(int sig) { - if (sig_sem != NULL) { - Atomic::inc(&pending_signals[sig]); - sig_sem->signal(); - } else { - // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init - // initialization isn't called. - assert(ReduceSignalUsage, "signal semaphore should be created"); - } -} - -static int check_pending_signals() { - int ret; - while (true) { - for (int i = 0; i < Sigexit + 1; i++) { - jint n = pending_signals[i]; - if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) { - return i; - } - } - JavaThread *thread = JavaThread::current(); - ThreadBlockInVM tbivm(thread); - - bool threadIsSuspended; - do { - thread->set_suspend_equivalent(); - sig_sem->wait(); - - // were we externally suspended while we were waiting? - threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); - if (threadIsSuspended) { - // The semaphore has been incremented, but while we were waiting - // another thread suspended us. We don't want to continue running - // while suspended because that would surprise the thread that - // suspended us. - sig_sem->signal(); - - thread->java_suspend_self(); - } - } while (threadIsSuspended); - } -} - -int os::signal_wait() { - return check_pending_signals(); -} - -//////////////////////////////////////////////////////////////////////////////// -// Virtual Memory - -static int page_size = -1; - -int os::vm_page_size() { - assert(page_size != -1, "must call os::init"); - return page_size; -} - -// Solaris allocates memory by pages. -int os::vm_allocation_granularity() { - assert(page_size != -1, "must call os::init"); - return page_size; -} - -static bool recoverable_mmap_error(int err) { - // See if the error is one we can let the caller handle. This - // list of errno values comes from the Solaris mmap(2) man page. - switch (err) { - case EBADF: - case EINVAL: - case ENOTSUP: - // let the caller deal with these errors - return true; - - default: - // Any remaining errors on this OS can cause our reserved mapping - // to be lost. That can cause confusion where different data - // structures think they have the same memory mapped. The worst - // scenario is if both the VM and a library think they have the - // same memory mapped. - return false; - } -} - -static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, - int err) { - warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT - ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, - os::strerror(err), err); -} - -static void warn_fail_commit_memory(char* addr, size_t bytes, - size_t alignment_hint, bool exec, - int err) { - warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT - ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, - alignment_hint, exec, os::strerror(err), err); -} - -int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { - int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; - size_t size = bytes; - char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); - if (res != NULL) { - if (UseNUMAInterleaving) { - numa_make_global(addr, bytes); - } - return 0; - } - - int err = errno; // save errno from mmap() call in mmap_chunk() - - if (!recoverable_mmap_error(err)) { - warn_fail_commit_memory(addr, bytes, exec, err); - vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); - } - - return err; -} - -bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { - return Solaris::commit_memory_impl(addr, bytes, exec) == 0; -} - -void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, - const char* mesg) { - assert(mesg != NULL, "mesg must be specified"); - int err = os::Solaris::commit_memory_impl(addr, bytes, exec); - if (err != 0) { - // the caller wants all commit errors to exit with the specified mesg: - warn_fail_commit_memory(addr, bytes, exec, err); - vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); - } -} - -size_t os::Solaris::page_size_for_alignment(size_t alignment) { - assert(is_aligned(alignment, (size_t) vm_page_size()), - SIZE_FORMAT " is not aligned to " SIZE_FORMAT, - alignment, (size_t) vm_page_size()); - - for (int i = 0; _page_sizes[i] != 0; i++) { - if (is_aligned(alignment, _page_sizes[i])) { - return _page_sizes[i]; - } - } - - return (size_t) vm_page_size(); -} - -int os::Solaris::commit_memory_impl(char* addr, size_t bytes, - size_t alignment_hint, bool exec) { - int err = Solaris::commit_memory_impl(addr, bytes, exec); - if (err == 0 && UseLargePages && alignment_hint > 0) { - assert(is_aligned(bytes, alignment_hint), - SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); - - // The syscall memcntl requires an exact page size (see man memcntl for details). - size_t page_size = page_size_for_alignment(alignment_hint); - if (page_size > (size_t) vm_page_size()) { - (void)Solaris::setup_large_pages(addr, bytes, page_size); - } - } - return err; -} - -bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, - bool exec) { - return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; -} - -void os::pd_commit_memory_or_exit(char* addr, size_t bytes, - size_t alignment_hint, bool exec, - const char* mesg) { - assert(mesg != NULL, "mesg must be specified"); - int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); - if (err != 0) { - // the caller wants all commit errors to exit with the specified mesg: - warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); - vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); - } -} - -// Uncommit the pages in a specified region. -void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { - if (madvise(addr, bytes, MADV_FREE) < 0) { - debug_only(warning("MADV_FREE failed.")); - return; - } -} - -bool os::pd_create_stack_guard_pages(char* addr, size_t size) { - return os::commit_memory(addr, size, !ExecMem); -} - -bool os::remove_stack_guard_pages(char* addr, size_t size) { - return os::uncommit_memory(addr, size); -} - -// Change the page size in a given range. -void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { - assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); - assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); - if (UseLargePages) { - size_t page_size = Solaris::page_size_for_alignment(alignment_hint); - if (page_size > (size_t) vm_page_size()) { - Solaris::setup_large_pages(addr, bytes, page_size); - } - } -} - -// Tell the OS to make the range local to the first-touching LWP -void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { - assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); - if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { - debug_only(warning("MADV_ACCESS_LWP failed.")); - } -} - -// Tell the OS that this range would be accessed from different LWPs. -void os::numa_make_global(char *addr, size_t bytes) { - assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); - if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { - debug_only(warning("MADV_ACCESS_MANY failed.")); - } -} - -// Get the number of the locality groups. -size_t os::numa_get_groups_num() { - size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); - return n != -1 ? n : 1; -} - -// Get a list of leaf locality groups. A leaf lgroup is group that -// doesn't have any children. Typical leaf group is a CPU or a CPU/memory -// board. An LWP is assigned to one of these groups upon creation. -size_t os::numa_get_leaf_groups(int *ids, size_t size) { - if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { - ids[0] = 0; - return 1; - } - int result_size = 0, top = 1, bottom = 0, cur = 0; - for (int k = 0; k < size; k++) { - int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], - (Solaris::lgrp_id_t*)&ids[top], size - top); - if (r == -1) { - ids[0] = 0; - return 1; - } - if (!r) { - // That's a leaf node. - assert(bottom <= cur, "Sanity check"); - // Check if the node has memory - if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], - NULL, 0, LGRP_RSRC_MEM) > 0) { - ids[bottom++] = ids[cur]; - } - } - top += r; - cur++; - } - if (bottom == 0) { - // Handle a situation, when the OS reports no memory available. - // Assume UMA architecture. - ids[0] = 0; - return 1; - } - return bottom; -} - -// Detect the topology change. Typically happens during CPU plugging-unplugging. -bool os::numa_topology_changed() { - int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); - if (is_stale != -1 && is_stale) { - Solaris::lgrp_fini(Solaris::lgrp_cookie()); - Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); - assert(c != 0, "Failure to initialize LGRP API"); - Solaris::set_lgrp_cookie(c); - return true; - } - return false; -} - -// Get the group id of the current LWP. -int os::numa_get_group_id() { - int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); - if (lgrp_id == -1) { - return 0; - } - const int size = os::numa_get_groups_num(); - int *ids = (int*)alloca(size * sizeof(int)); - - // Get the ids of all lgroups with memory; r is the count. - int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, - (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); - if (r <= 0) { - return 0; - } - return ids[os::random() % r]; -} - -int os::numa_get_group_id_for_address(const void* address) { - return 0; -} - -// Request information about the page. -bool os::get_page_info(char *start, page_info* info) { - const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; - uint64_t addr = (uintptr_t)start; - uint64_t outdata[2]; - uint_t validity = 0; - - if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { - return false; - } - - info->size = 0; - info->lgrp_id = -1; - - if ((validity & 1) != 0) { - if ((validity & 2) != 0) { - info->lgrp_id = outdata[0]; - } - if ((validity & 4) != 0) { - info->size = outdata[1]; - } - return true; - } - return false; -} - -// Scan the pages from start to end until a page different than -// the one described in the info parameter is encountered. -char *os::scan_pages(char *start, char* end, page_info* page_expected, - page_info* page_found) { - const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; - const size_t types = sizeof(info_types) / sizeof(info_types[0]); - uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; - uint_t validity[MAX_MEMINFO_CNT]; - - size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); - uint64_t p = (uint64_t)start; - while (p < (uint64_t)end) { - addrs[0] = p; - size_t addrs_count = 1; - while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { - addrs[addrs_count] = addrs[addrs_count - 1] + page_size; - addrs_count++; - } - - if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { - return NULL; - } - - size_t i = 0; - for (; i < addrs_count; i++) { - if ((validity[i] & 1) != 0) { - if ((validity[i] & 4) != 0) { - if (outdata[types * i + 1] != page_expected->size) { - break; - } - } else if (page_expected->size != 0) { - break; - } - - if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { - if (outdata[types * i] != page_expected->lgrp_id) { - break; - } - } - } else { - return NULL; - } - } - - if (i < addrs_count) { - if ((validity[i] & 2) != 0) { - page_found->lgrp_id = outdata[types * i]; - } else { - page_found->lgrp_id = -1; - } - if ((validity[i] & 4) != 0) { - page_found->size = outdata[types * i + 1]; - } else { - page_found->size = 0; - } - return (char*)addrs[i]; - } - - p = addrs[addrs_count - 1] + page_size; - } - return end; -} - -bool os::pd_uncommit_memory(char* addr, size_t bytes) { - size_t size = bytes; - // Map uncommitted pages PROT_NONE so we fail early if we touch an - // uncommitted page. Otherwise, the read/write might succeed if we - // have enough swap space to back the physical page. - return - NULL != Solaris::mmap_chunk(addr, size, - MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, - PROT_NONE); -} - -char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { - char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); - - if (b == MAP_FAILED) { - return NULL; - } - return b; -} - -char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, - size_t alignment_hint, bool fixed) { - char* addr = requested_addr; - int flags = MAP_PRIVATE | MAP_NORESERVE; - - assert(!(fixed && (alignment_hint > 0)), - "alignment hint meaningless with fixed mmap"); - - if (fixed) { - flags |= MAP_FIXED; - } else if (alignment_hint > (size_t) vm_page_size()) { - flags |= MAP_ALIGN; - addr = (char*) alignment_hint; - } - - // Map uncommitted pages PROT_NONE so we fail early if we touch an - // uncommitted page. Otherwise, the read/write might succeed if we - // have enough swap space to back the physical page. - return mmap_chunk(addr, bytes, flags, PROT_NONE); -} - -char* os::pd_reserve_memory(size_t bytes, char* requested_addr, - size_t alignment_hint) { - char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, - (requested_addr != NULL)); - - guarantee(requested_addr == NULL || requested_addr == addr, - "OS failed to return requested mmap address."); - return addr; -} - -char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { - assert(file_desc >= 0, "file_desc is not valid"); - char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); - if (result != NULL) { - if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { - vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); - } - } - return result; -} - -// Reserve memory at an arbitrary address, only if that area is -// available (and not reserved for something else). - -char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { - // Assert only that the size is a multiple of the page size, since - // that's all that mmap requires, and since that's all we really know - // about at this low abstraction level. If we need higher alignment, - // we can either pass an alignment to this method or verify alignment - // in one of the methods further up the call chain. See bug 5044738. - assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); - - // Since snv_84, Solaris attempts to honor the address hint - see 5003415. - char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); - - volatile int err = errno; - if (addr == requested_addr) { - return addr; - } - - if (addr != NULL) { - pd_unmap_memory(addr, bytes); - } - - return NULL; -} - -bool os::pd_release_memory(char* addr, size_t bytes) { - size_t size = bytes; - return munmap(addr, size) == 0; -} - -static bool solaris_mprotect(char* addr, size_t bytes, int prot) { - assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), - "addr must be page aligned"); - Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot); - int retVal = mprotect(addr, bytes, prot); - return retVal == 0; -} - -// Protect memory (Used to pass readonly pages through -// JNI GetArrayElements with empty arrays.) -// Also, used for serialization page and for compressed oops null pointer -// checking. -bool os::protect_memory(char* addr, size_t bytes, ProtType prot, - bool is_committed) { - unsigned int p = 0; - switch (prot) { - case MEM_PROT_NONE: p = PROT_NONE; break; - case MEM_PROT_READ: p = PROT_READ; break; - case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; - case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; - default: - ShouldNotReachHere(); - } - // is_committed is unused. - return solaris_mprotect(addr, bytes, p); -} - -// guard_memory and unguard_memory only happens within stack guard pages. -// Since ISM pertains only to the heap, guard and unguard memory should not -/// happen with an ISM region. -bool os::guard_memory(char* addr, size_t bytes) { - return solaris_mprotect(addr, bytes, PROT_NONE); -} - -bool os::unguard_memory(char* addr, size_t bytes) { - return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); -} - -// Large page support -static size_t _large_page_size = 0; - -// Insertion sort for small arrays (descending order). -static void insertion_sort_descending(size_t* array, int len) { - for (int i = 0; i < len; i++) { - size_t val = array[i]; - for (size_t key = i; key > 0 && array[key - 1] < val; --key) { - size_t tmp = array[key]; - array[key] = array[key - 1]; - array[key - 1] = tmp; - } - } -} - -bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { - const unsigned int usable_count = VM_Version::page_size_count(); - if (usable_count == 1) { - return false; - } - - // Find the right getpagesizes interface. When solaris 11 is the minimum - // build platform, getpagesizes() (without the '2') can be called directly. - typedef int (*gps_t)(size_t[], int); - gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); - if (gps_func == NULL) { - gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); - if (gps_func == NULL) { - if (warn) { - warning("MPSS is not supported by the operating system."); - } - return false; - } - } - - // Fill the array of page sizes. - int n = (*gps_func)(_page_sizes, page_sizes_max); - assert(n > 0, "Solaris bug?"); - - if (n == page_sizes_max) { - // Add a sentinel value (necessary only if the array was completely filled - // since it is static (zeroed at initialization)). - _page_sizes[--n] = 0; - DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) - } - assert(_page_sizes[n] == 0, "missing sentinel"); - trace_page_sizes("available page sizes", _page_sizes, n); - - if (n == 1) return false; // Only one page size available. - - // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and - // select up to usable_count elements. First sort the array, find the first - // acceptable value, then copy the usable sizes to the top of the array and - // trim the rest. Make sure to include the default page size :-). - // - // A better policy could get rid of the 4M limit by taking the sizes of the - // important VM memory regions (java heap and possibly the code cache) into - // account. - insertion_sort_descending(_page_sizes, n); - const size_t size_limit = - FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; - int beg; - for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; - const int end = MIN2((int)usable_count, n) - 1; - for (int cur = 0; cur < end; ++cur, ++beg) { - _page_sizes[cur] = _page_sizes[beg]; - } - _page_sizes[end] = vm_page_size(); - _page_sizes[end + 1] = 0; - - if (_page_sizes[end] > _page_sizes[end - 1]) { - // Default page size is not the smallest; sort again. - insertion_sort_descending(_page_sizes, end + 1); - } - *page_size = _page_sizes[0]; - - trace_page_sizes("usable page sizes", _page_sizes, end + 1); - return true; -} - -void os::large_page_init() { - if (UseLargePages) { - // print a warning if any large page related flag is specified on command line - bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || - !FLAG_IS_DEFAULT(LargePageSizeInBytes); - - UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); - } -} - -bool os::Solaris::is_valid_page_size(size_t bytes) { - for (int i = 0; _page_sizes[i] != 0; i++) { - if (_page_sizes[i] == bytes) { - return true; - } - } - return false; -} - -bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { - assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); - assert(is_aligned((void*) start, align), - PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); - assert(is_aligned(bytes, align), - SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); - - // Signal to OS that we want large pages for addresses - // from addr, addr + bytes - struct memcntl_mha mpss_struct; - mpss_struct.mha_cmd = MHA_MAPSIZE_VA; - mpss_struct.mha_pagesize = align; - mpss_struct.mha_flags = 0; - // Upon successful completion, memcntl() returns 0 - if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { - debug_only(warning("Attempt to use MPSS failed.")); - return false; - } - return true; -} - -char* os::pd_reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { - fatal("os::reserve_memory_special should not be called on Solaris."); - return NULL; -} - -bool os::pd_release_memory_special(char* base, size_t bytes) { - fatal("os::release_memory_special should not be called on Solaris."); - return false; -} - -size_t os::large_page_size() { - return _large_page_size; -} - -// MPSS allows application to commit large page memory on demand; with ISM -// the entire memory region must be allocated as shared memory. -bool os::can_commit_large_page_memory() { - return true; -} - -bool os::can_execute_large_page_memory() { - return true; -} - -// Sleep forever; naked call to OS-specific sleep; use with CAUTION -void os::infinite_sleep() { - while (true) { // sleep forever ... - ::sleep(100); // ... 100 seconds at a time - } -} - -// Used to convert frequent JVM_Yield() to nops -bool os::dont_yield() { - if (DontYieldALot) { - static hrtime_t last_time = 0; - hrtime_t diff = getTimeNanos() - last_time; - - if (diff < DontYieldALotInterval * 1000000) { - return true; - } - - last_time += diff; - - return false; - } else { - return false; - } -} - -// Note that yield semantics are defined by the scheduling class to which -// the thread currently belongs. Typically, yield will _not yield to -// other equal or higher priority threads that reside on the dispatch queues -// of other CPUs. - -void os::naked_yield() { - thr_yield(); -} - -// Interface for setting lwp priorities. We are using T2 libthread, -// which forces the use of bound threads, so all of our threads will -// be assigned to real lwp's. Using the thr_setprio function is -// meaningless in this mode so we must adjust the real lwp's priority. -// The routines below implement the getting and setting of lwp priorities. -// -// Note: There are three priority scales used on Solaris. Java priotities -// which range from 1 to 10, libthread "thr_setprio" scale which range -// from 0 to 127, and the current scheduling class of the process we -// are running in. This is typically from -60 to +60. -// The setting of the lwp priorities in done after a call to thr_setprio -// so Java priorities are mapped to libthread priorities and we map from -// the latter to lwp priorities. We don't keep priorities stored in -// Java priorities since some of our worker threads want to set priorities -// higher than all Java threads. -// -// For related information: -// (1) man -s 2 priocntl -// (2) man -s 4 priocntl -// (3) man dispadmin -// = librt.so -// = libthread/common/rtsched.c - thrp_setlwpprio(). -// = ps -cL ... to validate priority. -// = sched_get_priority_min and _max -// pthread_create -// sched_setparam -// pthread_setschedparam -// -// Assumptions: -// + We assume that all threads in the process belong to the same -// scheduling class. IE. an homogenous process. -// + Must be root or in IA group to change change "interactive" attribute. -// Priocntl() will fail silently. The only indication of failure is when -// we read-back the value and notice that it hasn't changed. -// + Interactive threads enter the runq at the head, non-interactive at the tail. -// + For RT, change timeslice as well. Invariant: -// constant "priority integral" -// Konst == TimeSlice * (60-Priority) -// Given a priority, compute appropriate timeslice. -// + Higher numerical values have higher priority. - -// sched class attributes -typedef struct { - int schedPolicy; // classID - int maxPrio; - int minPrio; -} SchedInfo; - - -static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; - -#ifdef ASSERT -static int ReadBackValidate = 1; -#endif -static int myClass = 0; -static int myMin = 0; -static int myMax = 0; -static int myCur = 0; -static bool priocntl_enable = false; - -static const int criticalPrio = FXCriticalPriority; -static int java_MaxPriority_to_os_priority = 0; // Saved mapping - - -// lwp_priocntl_init -// -// Try to determine the priority scale for our process. -// -// Return errno or 0 if OK. -// -static int lwp_priocntl_init() { - int rslt; - pcinfo_t ClassInfo; - pcparms_t ParmInfo; - int i; - - if (!UseThreadPriorities) return 0; - - // If ThreadPriorityPolicy is 1, switch tables - if (ThreadPriorityPolicy == 1) { - for (i = 0; i < CriticalPriority+1; i++) - os::java_to_os_priority[i] = prio_policy1[i]; - } - if (UseCriticalJavaThreadPriority) { - // MaxPriority always maps to the FX scheduling class and criticalPrio. - // See set_native_priority() and set_lwp_class_and_priority(). - // Save original MaxPriority mapping in case attempt to - // use critical priority fails. - java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; - // Set negative to distinguish from other priorities - os::java_to_os_priority[MaxPriority] = -criticalPrio; - } - - // Get IDs for a set of well-known scheduling classes. - // TODO-FIXME: GETCLINFO returns the current # of classes in the - // the system. We should have a loop that iterates over the - // classID values, which are known to be "small" integers. - - strcpy(ClassInfo.pc_clname, "TS"); - ClassInfo.pc_cid = -1; - rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); - if (rslt < 0) return errno; - assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); - tsLimits.schedPolicy = ClassInfo.pc_cid; - tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; - tsLimits.minPrio = -tsLimits.maxPrio; - - strcpy(ClassInfo.pc_clname, "IA"); - ClassInfo.pc_cid = -1; - rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); - if (rslt < 0) return errno; - assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); - iaLimits.schedPolicy = ClassInfo.pc_cid; - iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; - iaLimits.minPrio = -iaLimits.maxPrio; - - strcpy(ClassInfo.pc_clname, "RT"); - ClassInfo.pc_cid = -1; - rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); - if (rslt < 0) return errno; - assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); - rtLimits.schedPolicy = ClassInfo.pc_cid; - rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; - rtLimits.minPrio = 0; - - strcpy(ClassInfo.pc_clname, "FX"); - ClassInfo.pc_cid = -1; - rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); - if (rslt < 0) return errno; - assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); - fxLimits.schedPolicy = ClassInfo.pc_cid; - fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; - fxLimits.minPrio = 0; - - // Query our "current" scheduling class. - // This will normally be IA, TS or, rarely, FX or RT. - memset(&ParmInfo, 0, sizeof(ParmInfo)); - ParmInfo.pc_cid = PC_CLNULL; - rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); - if (rslt < 0) return errno; - myClass = ParmInfo.pc_cid; - - // We now know our scheduling classId, get specific information - // about the class. - ClassInfo.pc_cid = myClass; - ClassInfo.pc_clname[0] = 0; - rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); - if (rslt < 0) return errno; - - if (ThreadPriorityVerbose) { - tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); - } - - memset(&ParmInfo, 0, sizeof(pcparms_t)); - ParmInfo.pc_cid = PC_CLNULL; - rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); - if (rslt < 0) return errno; - - if (ParmInfo.pc_cid == rtLimits.schedPolicy) { - myMin = rtLimits.minPrio; - myMax = rtLimits.maxPrio; - } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { - iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; - myMin = iaLimits.minPrio; - myMax = iaLimits.maxPrio; - myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict - } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { - tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; - myMin = tsLimits.minPrio; - myMax = tsLimits.maxPrio; - myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict - } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { - fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; - myMin = fxLimits.minPrio; - myMax = fxLimits.maxPrio; - myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict - } else { - // No clue - punt - if (ThreadPriorityVerbose) { - tty->print_cr("Unknown scheduling class: %s ... \n", - ClassInfo.pc_clname); - } - return EINVAL; // no clue, punt - } - - if (ThreadPriorityVerbose) { - tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); - } - - priocntl_enable = true; // Enable changing priorities - return 0; -} - -#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) -#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) -#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) -#define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) - - -// scale_to_lwp_priority -// -// Convert from the libthread "thr_setprio" scale to our current -// lwp scheduling class scale. -// -static int scale_to_lwp_priority(int rMin, int rMax, int x) { - int v; - - if (x == 127) return rMax; // avoid round-down - v = (((x*(rMax-rMin)))/128)+rMin; - return v; -} - - -// set_lwp_class_and_priority -int set_lwp_class_and_priority(int ThreadID, int lwpid, - int newPrio, int new_class, bool scale) { - int rslt; - int Actual, Expected, prv; - pcparms_t ParmInfo; // for GET-SET -#ifdef ASSERT - pcparms_t ReadBack; // for readback -#endif - - // Set priority via PC_GETPARMS, update, PC_SETPARMS - // Query current values. - // TODO: accelerate this by eliminating the PC_GETPARMS call. - // Cache "pcparms_t" in global ParmCache. - // TODO: elide set-to-same-value - - // If something went wrong on init, don't change priorities. - if (!priocntl_enable) { - if (ThreadPriorityVerbose) { - tty->print_cr("Trying to set priority but init failed, ignoring"); - } - return EINVAL; - } - - // If lwp hasn't started yet, just return - // the _start routine will call us again. - if (lwpid <= 0) { - if (ThreadPriorityVerbose) { - tty->print_cr("deferring the set_lwp_class_and_priority of thread " - INTPTR_FORMAT " to %d, lwpid not set", - ThreadID, newPrio); - } - return 0; - } - - if (ThreadPriorityVerbose) { - tty->print_cr ("set_lwp_class_and_priority(" - INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", - ThreadID, lwpid, newPrio); - } - - memset(&ParmInfo, 0, sizeof(pcparms_t)); - ParmInfo.pc_cid = PC_CLNULL; - rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); - if (rslt < 0) return errno; - - int cur_class = ParmInfo.pc_cid; - ParmInfo.pc_cid = (id_t)new_class; - - if (new_class == rtLimits.schedPolicy) { - rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; - rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, - rtLimits.maxPrio, newPrio) - : newPrio; - rtInfo->rt_tqsecs = RT_NOCHANGE; - rtInfo->rt_tqnsecs = RT_NOCHANGE; - if (ThreadPriorityVerbose) { - tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); - } - } else if (new_class == iaLimits.schedPolicy) { - iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; - int maxClamped = MIN2(iaLimits.maxPrio, - cur_class == new_class - ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); - iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, - maxClamped, newPrio) - : newPrio; - iaInfo->ia_uprilim = cur_class == new_class - ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; - iaInfo->ia_mode = IA_NOCHANGE; - if (ThreadPriorityVerbose) { - tty->print_cr("IA: [%d...%d] %d->%d\n", - iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); - } - } else if (new_class == tsLimits.schedPolicy) { - tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; - int maxClamped = MIN2(tsLimits.maxPrio, - cur_class == new_class - ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); - tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, - maxClamped, newPrio) - : newPrio; - tsInfo->ts_uprilim = cur_class == new_class - ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; - if (ThreadPriorityVerbose) { - tty->print_cr("TS: [%d...%d] %d->%d\n", - tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); - } - } else if (new_class == fxLimits.schedPolicy) { - fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; - int maxClamped = MIN2(fxLimits.maxPrio, - cur_class == new_class - ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); - fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, - maxClamped, newPrio) - : newPrio; - fxInfo->fx_uprilim = cur_class == new_class - ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; - fxInfo->fx_tqsecs = FX_NOCHANGE; - fxInfo->fx_tqnsecs = FX_NOCHANGE; - if (ThreadPriorityVerbose) { - tty->print_cr("FX: [%d...%d] %d->%d\n", - fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); - } - } else { - if (ThreadPriorityVerbose) { - tty->print_cr("Unknown new scheduling class %d\n", new_class); - } - return EINVAL; // no clue, punt - } - - rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); - if (ThreadPriorityVerbose && rslt) { - tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); - } - if (rslt < 0) return errno; - -#ifdef ASSERT - // Sanity check: read back what we just attempted to set. - // In theory it could have changed in the interim ... - // - // The priocntl system call is tricky. - // Sometimes it'll validate the priority value argument and - // return EINVAL if unhappy. At other times it fails silently. - // Readbacks are prudent. - - if (!ReadBackValidate) return 0; - - memset(&ReadBack, 0, sizeof(pcparms_t)); - ReadBack.pc_cid = PC_CLNULL; - rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); - assert(rslt >= 0, "priocntl failed"); - Actual = Expected = 0xBAD; - assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); - if (ParmInfo.pc_cid == rtLimits.schedPolicy) { - Actual = RTPRI(ReadBack)->rt_pri; - Expected = RTPRI(ParmInfo)->rt_pri; - } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { - Actual = IAPRI(ReadBack)->ia_upri; - Expected = IAPRI(ParmInfo)->ia_upri; - } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { - Actual = TSPRI(ReadBack)->ts_upri; - Expected = TSPRI(ParmInfo)->ts_upri; - } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { - Actual = FXPRI(ReadBack)->fx_upri; - Expected = FXPRI(ParmInfo)->fx_upri; - } else { - if (ThreadPriorityVerbose) { - tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", - ParmInfo.pc_cid); - } - } - - if (Actual != Expected) { - if (ThreadPriorityVerbose) { - tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", - lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); - } - } -#endif - - return 0; -} - -// Solaris only gives access to 128 real priorities at a time, -// so we expand Java's ten to fill this range. This would be better -// if we dynamically adjusted relative priorities. -// -// The ThreadPriorityPolicy option allows us to select 2 different -// priority scales. -// -// ThreadPriorityPolicy=0 -// Since the Solaris' default priority is MaximumPriority, we do not -// set a priority lower than Max unless a priority lower than -// NormPriority is requested. -// -// ThreadPriorityPolicy=1 -// This mode causes the priority table to get filled with -// linear values. NormPriority get's mapped to 50% of the -// Maximum priority an so on. This will cause VM threads -// to get unfair treatment against other Solaris processes -// which do not explicitly alter their thread priorities. - -int os::java_to_os_priority[CriticalPriority + 1] = { - -99999, // 0 Entry should never be used - - 0, // 1 MinPriority - 32, // 2 - 64, // 3 - - 96, // 4 - 127, // 5 NormPriority - 127, // 6 - - 127, // 7 - 127, // 8 - 127, // 9 NearMaxPriority - - 127, // 10 MaxPriority - - -criticalPrio // 11 CriticalPriority -}; - -OSReturn os::set_native_priority(Thread* thread, int newpri) { - OSThread* osthread = thread->osthread(); - - // Save requested priority in case the thread hasn't been started - osthread->set_native_priority(newpri); - - // Check for critical priority request - bool fxcritical = false; - if (newpri == -criticalPrio) { - fxcritical = true; - newpri = criticalPrio; - } - - assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); - if (!UseThreadPriorities) return OS_OK; - - int status = 0; - - if (!fxcritical) { - // Use thr_setprio only if we have a priority that thr_setprio understands - status = thr_setprio(thread->osthread()->thread_id(), newpri); - } - - int lwp_status = - set_lwp_class_and_priority(osthread->thread_id(), - osthread->lwp_id(), - newpri, - fxcritical ? fxLimits.schedPolicy : myClass, - !fxcritical); - if (lwp_status != 0 && fxcritical) { - // Try again, this time without changing the scheduling class - newpri = java_MaxPriority_to_os_priority; - lwp_status = set_lwp_class_and_priority(osthread->thread_id(), - osthread->lwp_id(), - newpri, myClass, false); - } - status |= lwp_status; - return (status == 0) ? OS_OK : OS_ERR; -} - - -OSReturn os::get_native_priority(const Thread* const thread, - int *priority_ptr) { - int p; - if (!UseThreadPriorities) { - *priority_ptr = NormalPriority; - return OS_OK; - } - int status = thr_getprio(thread->osthread()->thread_id(), &p); - if (status != 0) { - return OS_ERR; - } - *priority_ptr = p; - return OS_OK; -} - -//////////////////////////////////////////////////////////////////////////////// -// suspend/resume support - -// The low-level signal-based suspend/resume support is a remnant from the -// old VM-suspension that used to be for java-suspension, safepoints etc, -// within hotspot. Currently used by JFR's OSThreadSampler -// -// The remaining code is greatly simplified from the more general suspension -// code that used to be used. -// -// The protocol is quite simple: -// - suspend: -// - sends a signal to the target thread -// - polls the suspend state of the osthread using a yield loop -// - target thread signal handler (SR_handler) sets suspend state -// and blocks in sigsuspend until continued -// - resume: -// - sets target osthread state to continue -// - sends signal to end the sigsuspend loop in the SR_handler -// -// Note that the SR_lock plays no role in this suspend/resume protocol, -// but is checked for NULL in SR_handler as a thread termination indicator. -// The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. -// -// Note that resume_clear_context() and suspend_save_context() are needed -// by SR_handler(), so that fetch_frame_from_ucontext() works, -// which in part is used by: -// - Forte Analyzer: AsyncGetCallTrace() -// - StackBanging: get_frame_at_stack_banging_point() -// - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() - -static void resume_clear_context(OSThread *osthread) { - osthread->set_ucontext(NULL); -} - -static void suspend_save_context(OSThread *osthread, ucontext_t* context) { - osthread->set_ucontext(context); -} - -static PosixSemaphore sr_semaphore; - -void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { - // Save and restore errno to avoid confusing native code with EINTR - // after sigsuspend. - int old_errno = errno; - - OSThread* osthread = thread->osthread(); - assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); - - os::SuspendResume::State current = osthread->sr.state(); - if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { - suspend_save_context(osthread, context); - - // attempt to switch the state, we assume we had a SUSPEND_REQUEST - os::SuspendResume::State state = osthread->sr.suspended(); - if (state == os::SuspendResume::SR_SUSPENDED) { - sigset_t suspend_set; // signals for sigsuspend() - - // get current set of blocked signals and unblock resume signal - pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); - sigdelset(&suspend_set, ASYNC_SIGNAL); - - sr_semaphore.signal(); - // wait here until we are resumed - while (1) { - sigsuspend(&suspend_set); - - os::SuspendResume::State result = osthread->sr.running(); - if (result == os::SuspendResume::SR_RUNNING) { - sr_semaphore.signal(); - break; - } - } - - } else if (state == os::SuspendResume::SR_RUNNING) { - // request was cancelled, continue - } else { - ShouldNotReachHere(); - } - - resume_clear_context(osthread); - } else if (current == os::SuspendResume::SR_RUNNING) { - // request was cancelled, continue - } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { - // ignore - } else { - // ignore - } - - errno = old_errno; -} - -void os::print_statistics() { -} - -bool os::message_box(const char* title, const char* message) { - int i; - fdStream err(defaultStream::error_fd()); - for (i = 0; i < 78; i++) err.print_raw("="); - err.cr(); - err.print_raw_cr(title); - for (i = 0; i < 78; i++) err.print_raw("-"); - err.cr(); - err.print_raw_cr(message); - for (i = 0; i < 78; i++) err.print_raw("="); - err.cr(); - - char buf[16]; - // Prevent process from exiting upon "read error" without consuming all CPU - while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } - - return buf[0] == 'y' || buf[0] == 'Y'; -} - -static int sr_notify(OSThread* osthread) { - int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); - assert_status(status == 0, status, "thr_kill"); - return status; -} - -// "Randomly" selected value for how long we want to spin -// before bailing out on suspending a thread, also how often -// we send a signal to a thread we want to resume -static const int RANDOMLY_LARGE_INTEGER = 1000000; -static const int RANDOMLY_LARGE_INTEGER2 = 100; - -static bool do_suspend(OSThread* osthread) { - assert(osthread->sr.is_running(), "thread should be running"); - assert(!sr_semaphore.trywait(), "semaphore has invalid state"); - - // mark as suspended and send signal - if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { - // failed to switch, state wasn't running? - ShouldNotReachHere(); - return false; - } - - if (sr_notify(osthread) != 0) { - ShouldNotReachHere(); - } - - // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED - while (true) { - if (sr_semaphore.timedwait(2000)) { - break; - } else { - // timeout - os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); - if (cancelled == os::SuspendResume::SR_RUNNING) { - return false; - } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { - // make sure that we consume the signal on the semaphore as well - sr_semaphore.wait(); - break; - } else { - ShouldNotReachHere(); - return false; - } - } - } - - guarantee(osthread->sr.is_suspended(), "Must be suspended"); - return true; -} - -static void do_resume(OSThread* osthread) { - assert(osthread->sr.is_suspended(), "thread should be suspended"); - assert(!sr_semaphore.trywait(), "invalid semaphore state"); - - if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { - // failed to switch to WAKEUP_REQUEST - ShouldNotReachHere(); - return; - } - - while (true) { - if (sr_notify(osthread) == 0) { - if (sr_semaphore.timedwait(2)) { - if (osthread->sr.is_running()) { - return; - } - } - } else { - ShouldNotReachHere(); - } - } - - guarantee(osthread->sr.is_running(), "Must be running!"); -} - -void os::SuspendedThreadTask::internal_do_task() { - if (do_suspend(_thread->osthread())) { - SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); - do_task(context); - do_resume(_thread->osthread()); - } -} - -// This does not do anything on Solaris. This is basically a hook for being -// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. -void os::os_exception_wrapper(java_call_t f, JavaValue* value, - const methodHandle& method, JavaCallArguments* args, - Thread* thread) { - f(value, method, args, thread); -} - -// This routine may be used by user applications as a "hook" to catch signals. -// The user-defined signal handler must pass unrecognized signals to this -// routine, and if it returns true (non-zero), then the signal handler must -// return immediately. If the flag "abort_if_unrecognized" is true, then this -// routine will never retun false (zero), but instead will execute a VM panic -// routine kill the process. -// -// If this routine returns false, it is OK to call it again. This allows -// the user-defined signal handler to perform checks either before or after -// the VM performs its own checks. Naturally, the user code would be making -// a serious error if it tried to handle an exception (such as a null check -// or breakpoint) that the VM was generating for its own correct operation. -// -// This routine may recognize any of the following kinds of signals: -// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, -// ASYNC_SIGNAL. -// It should be consulted by handlers for any of those signals. -// -// The caller of this routine must pass in the three arguments supplied -// to the function referred to in the "sa_sigaction" (not the "sa_handler") -// field of the structure passed to sigaction(). This routine assumes that -// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. -// -// Note that the VM will print warnings if it detects conflicting signal -// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". -// -extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, - siginfo_t* siginfo, - void* ucontext, - int abort_if_unrecognized); - - -void signalHandler(int sig, siginfo_t* info, void* ucVoid) { - int orig_errno = errno; // Preserve errno value over signal handler. - JVM_handle_solaris_signal(sig, info, ucVoid, true); - errno = orig_errno; -} - -// This boolean allows users to forward their own non-matching signals -// to JVM_handle_solaris_signal, harmlessly. -bool os::Solaris::signal_handlers_are_installed = false; - -// For signal-chaining -bool os::Solaris::libjsig_is_loaded = false; -typedef struct sigaction *(*get_signal_t)(int); -get_signal_t os::Solaris::get_signal_action = NULL; - -struct sigaction* os::Solaris::get_chained_signal_action(int sig) { - struct sigaction *actp = NULL; - - if ((libjsig_is_loaded) && (sig <= Maxsignum)) { - // Retrieve the old signal handler from libjsig - actp = (*get_signal_action)(sig); - } - if (actp == NULL) { - // Retrieve the preinstalled signal handler from jvm - actp = get_preinstalled_handler(sig); - } - - return actp; -} - -static bool call_chained_handler(struct sigaction *actp, int sig, - siginfo_t *siginfo, void *context) { - // Call the old signal handler - if (actp->sa_handler == SIG_DFL) { - // It's more reasonable to let jvm treat it as an unexpected exception - // instead of taking the default action. - return false; - } else if (actp->sa_handler != SIG_IGN) { - if ((actp->sa_flags & SA_NODEFER) == 0) { - // automaticlly block the signal - sigaddset(&(actp->sa_mask), sig); - } - - sa_handler_t hand; - sa_sigaction_t sa; - bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; - // retrieve the chained handler - if (siginfo_flag_set) { - sa = actp->sa_sigaction; - } else { - hand = actp->sa_handler; - } - - if ((actp->sa_flags & SA_RESETHAND) != 0) { - actp->sa_handler = SIG_DFL; - } - - // try to honor the signal mask - sigset_t oset; - pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); - - // call into the chained handler - if (siginfo_flag_set) { - (*sa)(sig, siginfo, context); - } else { - (*hand)(sig); - } - - // restore the signal mask - pthread_sigmask(SIG_SETMASK, &oset, 0); - } - // Tell jvm's signal handler the signal is taken care of. - return true; -} - -bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { - bool chained = false; - // signal-chaining - if (UseSignalChaining) { - struct sigaction *actp = get_chained_signal_action(sig); - if (actp != NULL) { - chained = call_chained_handler(actp, sig, siginfo, context); - } - } - return chained; -} - -struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { - assert((chainedsigactions != (struct sigaction *)NULL) && - (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); - if (preinstalled_sigs[sig] != 0) { - return &chainedsigactions[sig]; - } - return NULL; -} - -void os::Solaris::save_preinstalled_handler(int sig, - struct sigaction& oldAct) { - assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); - assert((chainedsigactions != (struct sigaction *)NULL) && - (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); - chainedsigactions[sig] = oldAct; - preinstalled_sigs[sig] = 1; -} - -void os::Solaris::set_signal_handler(int sig, bool set_installed, - bool oktochain) { - // Check for overwrite. - struct sigaction oldAct; - sigaction(sig, (struct sigaction*)NULL, &oldAct); - void* oldhand = - oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) - : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); - if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && - oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && - oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { - if (AllowUserSignalHandlers || !set_installed) { - // Do not overwrite; user takes responsibility to forward to us. - return; - } else if (UseSignalChaining) { - if (oktochain) { - // save the old handler in jvm - save_preinstalled_handler(sig, oldAct); - } else { - vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); - } - // libjsig also interposes the sigaction() call below and saves the - // old sigaction on it own. - } else { - fatal("Encountered unexpected pre-existing sigaction handler " - "%#lx for signal %d.", (long)oldhand, sig); - } - } - - struct sigaction sigAct; - sigfillset(&(sigAct.sa_mask)); - sigAct.sa_handler = SIG_DFL; - - sigAct.sa_sigaction = signalHandler; - // Handle SIGSEGV on alternate signal stack if - // not using stack banging - if (!UseStackBanging && sig == SIGSEGV) { - sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; - } else { - sigAct.sa_flags = SA_SIGINFO | SA_RESTART; - } - os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); - - sigaction(sig, &sigAct, &oldAct); - - void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) - : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); - assert(oldhand2 == oldhand, "no concurrent signal handler installation"); -} - - -#define DO_SIGNAL_CHECK(sig) \ - do { \ - if (!sigismember(&check_signal_done, sig)) { \ - os::Solaris::check_signal_handler(sig); \ - } \ - } while (0) - -// This method is a periodic task to check for misbehaving JNI applications -// under CheckJNI, we can add any periodic checks here - -void os::run_periodic_checks() { - // A big source of grief is hijacking virt. addr 0x0 on Solaris, - // thereby preventing a NULL checks. - if (!check_addr0_done) check_addr0_done = check_addr0(tty); - - if (check_signals == false) return; - - // SEGV and BUS if overridden could potentially prevent - // generation of hs*.log in the event of a crash, debugging - // such a case can be very challenging, so we absolutely - // check for the following for a good measure: - DO_SIGNAL_CHECK(SIGSEGV); - DO_SIGNAL_CHECK(SIGILL); - DO_SIGNAL_CHECK(SIGFPE); - DO_SIGNAL_CHECK(SIGBUS); - DO_SIGNAL_CHECK(SIGPIPE); - DO_SIGNAL_CHECK(SIGXFSZ); - DO_SIGNAL_CHECK(ASYNC_SIGNAL); - - // ReduceSignalUsage allows the user to override these handlers - // see comments at the very top and jvm_solaris.h - if (!ReduceSignalUsage) { - DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); - DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); - DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); - DO_SIGNAL_CHECK(BREAK_SIGNAL); - } -} - -typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); - -static os_sigaction_t os_sigaction = NULL; - -void os::Solaris::check_signal_handler(int sig) { - char buf[O_BUFLEN]; - address jvmHandler = NULL; - - struct sigaction act; - if (os_sigaction == NULL) { - // only trust the default sigaction, in case it has been interposed - os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); - if (os_sigaction == NULL) return; - } - - os_sigaction(sig, (struct sigaction*)NULL, &act); - - address thisHandler = (act.sa_flags & SA_SIGINFO) - ? CAST_FROM_FN_PTR(address, act.sa_sigaction) - : CAST_FROM_FN_PTR(address, act.sa_handler); - - - switch (sig) { - case SIGSEGV: - case SIGBUS: - case SIGFPE: - case SIGPIPE: - case SIGXFSZ: - case SIGILL: - case ASYNC_SIGNAL: - jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); - break; - - case SHUTDOWN1_SIGNAL: - case SHUTDOWN2_SIGNAL: - case SHUTDOWN3_SIGNAL: - case BREAK_SIGNAL: - jvmHandler = (address)user_handler(); - break; - - default: - return; - } - - if (thisHandler != jvmHandler) { - tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); - tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); - tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); - // No need to check this sig any longer - sigaddset(&check_signal_done, sig); - // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN - if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { - tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", - exception_name(sig, buf, O_BUFLEN)); - } - } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { - tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); - tty->print("expected:"); - os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); - tty->cr(); - tty->print(" found:"); - os::Posix::print_sa_flags(tty, act.sa_flags); - tty->cr(); - // No need to check this sig any longer - sigaddset(&check_signal_done, sig); - } - - // Print all the signal handler state - if (sigismember(&check_signal_done, sig)) { - print_signal_handlers(tty, buf, O_BUFLEN); - } - -} - -void os::Solaris::install_signal_handlers() { - signal_handlers_are_installed = true; - - // signal-chaining - typedef void (*signal_setting_t)(); - signal_setting_t begin_signal_setting = NULL; - signal_setting_t end_signal_setting = NULL; - begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, - dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); - if (begin_signal_setting != NULL) { - end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, - dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); - get_signal_action = CAST_TO_FN_PTR(get_signal_t, - dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); - libjsig_is_loaded = true; - assert(UseSignalChaining, "should enable signal-chaining"); - } - if (libjsig_is_loaded) { - // Tell libjsig jvm is setting signal handlers - (*begin_signal_setting)(); - } - - set_signal_handler(SIGSEGV, true, true); - set_signal_handler(SIGPIPE, true, true); - set_signal_handler(SIGXFSZ, true, true); - set_signal_handler(SIGBUS, true, true); - set_signal_handler(SIGILL, true, true); - set_signal_handler(SIGFPE, true, true); - set_signal_handler(ASYNC_SIGNAL, true, true); - - if (libjsig_is_loaded) { - // Tell libjsig jvm finishes setting signal handlers - (*end_signal_setting)(); - } - - // We don't activate signal checker if libjsig is in place, we trust ourselves - // and if UserSignalHandler is installed all bets are off. - // Log that signal checking is off only if -verbose:jni is specified. - if (CheckJNICalls) { - if (libjsig_is_loaded) { - log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled"); - check_signals = false; - } - if (AllowUserSignalHandlers) { - log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); - check_signals = false; - } - } -} - - -void report_error(const char* file_name, int line_no, const char* title, - const char* format, ...); - -// (Static) wrappers for the liblgrp API -os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; -os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; -os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; -os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; -os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; -os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; -os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; -os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; -os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; - -static address resolve_symbol_lazy(const char* name) { - address addr = (address) dlsym(RTLD_DEFAULT, name); - if (addr == NULL) { - // RTLD_DEFAULT was not defined on some early versions of 2.5.1 - addr = (address) dlsym(RTLD_NEXT, name); - } - return addr; -} - -static address resolve_symbol(const char* name) { - address addr = resolve_symbol_lazy(name); - if (addr == NULL) { - fatal(dlerror()); - } - return addr; -} - -void os::Solaris::libthread_init() { - address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); - - lwp_priocntl_init(); - - // RTLD_DEFAULT was not defined on some early versions of 5.5.1 - if (func == NULL) { - func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); - // Guarantee that this VM is running on an new enough OS (5.6 or - // later) that it will have a new enough libthread.so. - guarantee(func != NULL, "libthread.so is too old."); - } - - int size; - void (*handler_info_func)(address *, int *); - handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); - handler_info_func(&handler_start, &size); - handler_end = handler_start + size; -} - - -int_fnP_mutex_tP os::Solaris::_mutex_lock; -int_fnP_mutex_tP os::Solaris::_mutex_trylock; -int_fnP_mutex_tP os::Solaris::_mutex_unlock; -int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; -int_fnP_mutex_tP os::Solaris::_mutex_destroy; -int os::Solaris::_mutex_scope = USYNC_THREAD; - -int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; -int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; -int_fnP_cond_tP os::Solaris::_cond_signal; -int_fnP_cond_tP os::Solaris::_cond_broadcast; -int_fnP_cond_tP_i_vP os::Solaris::_cond_init; -int_fnP_cond_tP os::Solaris::_cond_destroy; -int os::Solaris::_cond_scope = USYNC_THREAD; -bool os::Solaris::_synchronization_initialized; - -void os::Solaris::synchronization_init() { - if (UseLWPSynchronization) { - os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); - os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); - os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); - os::Solaris::set_mutex_init(lwp_mutex_init); - os::Solaris::set_mutex_destroy(lwp_mutex_destroy); - os::Solaris::set_mutex_scope(USYNC_THREAD); - - os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); - os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); - os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); - os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); - os::Solaris::set_cond_init(lwp_cond_init); - os::Solaris::set_cond_destroy(lwp_cond_destroy); - os::Solaris::set_cond_scope(USYNC_THREAD); - } else { - os::Solaris::set_mutex_scope(USYNC_THREAD); - os::Solaris::set_cond_scope(USYNC_THREAD); - - if (UsePthreads) { - os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); - os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); - os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); - os::Solaris::set_mutex_init(pthread_mutex_default_init); - os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); - - os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); - os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); - os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); - os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); - os::Solaris::set_cond_init(pthread_cond_default_init); - os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); - } else { - os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); - os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); - os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); - os::Solaris::set_mutex_init(::mutex_init); - os::Solaris::set_mutex_destroy(::mutex_destroy); - - os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); - os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); - os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); - os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); - os::Solaris::set_cond_init(::cond_init); - os::Solaris::set_cond_destroy(::cond_destroy); - } - } - _synchronization_initialized = true; -} - -bool os::Solaris::liblgrp_init() { - void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); - if (handle != NULL) { - os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); - os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); - os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); - os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); - os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); - os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); - os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); - os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, - dlsym(handle, "lgrp_cookie_stale"))); - - lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); - set_lgrp_cookie(c); - return true; - } - return false; -} - -// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); -typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); -static pset_getloadavg_type pset_getloadavg_ptr = NULL; - -void init_pset_getloadavg_ptr(void) { - pset_getloadavg_ptr = - (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); - if (pset_getloadavg_ptr == NULL) { - log_warning(os)("pset_getloadavg function not found"); - } -} - -int os::Solaris::_dev_zero_fd = -1; - -// this is called _before_ the global arguments have been parsed -void os::init(void) { - _initial_pid = getpid(); - - max_hrtime = first_hrtime = gethrtime(); - - init_random(1234567); - - page_size = sysconf(_SC_PAGESIZE); - if (page_size == -1) { - fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); - } - init_page_sizes((size_t) page_size); - - Solaris::initialize_system_info(); - - int fd = ::open("/dev/zero", O_RDWR); - if (fd < 0) { - fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); - } else { - Solaris::set_dev_zero_fd(fd); - - // Close on exec, child won't inherit. - fcntl(fd, F_SETFD, FD_CLOEXEC); - } - - clock_tics_per_sec = CLK_TCK; - - // check if dladdr1() exists; dladdr1 can provide more information than - // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 - // and is available on linker patches for 5.7 and 5.8. - // libdl.so must have been loaded, this call is just an entry lookup - void * hdl = dlopen("libdl.so", RTLD_NOW); - if (hdl) { - dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); - } - - // main_thread points to the thread that created/loaded the JVM. - main_thread = thr_self(); - - // dynamic lookup of functions that may not be available in our lowest - // supported Solaris release - void * handle = dlopen("libc.so.1", RTLD_LAZY); - if (handle != NULL) { - Solaris::_pthread_setname_np = // from 11.3 - (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); - } - - // Shared Posix initialization - os::Posix::init(); -} - -// To install functions for atexit system call -extern "C" { - static void perfMemory_exit_helper() { - perfMemory_exit(); - } -} - -// this is called _after_ the global arguments have been parsed -jint os::init_2(void) { - // try to enable extended file IO ASAP, see 6431278 - os::Solaris::try_enable_extended_io(); - - // Check and sets minimum stack sizes against command line options - if (Posix::set_minimum_stack_sizes() == JNI_ERR) { - return JNI_ERR; - } - - Solaris::libthread_init(); - - if (UseNUMA) { - if (!Solaris::liblgrp_init()) { - UseNUMA = false; - } else { - size_t lgrp_limit = os::numa_get_groups_num(); - int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); - size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); - FREE_C_HEAP_ARRAY(int, lgrp_ids); - if (lgrp_num < 2) { - // There's only one locality group, disable NUMA unless - // user explicilty forces NUMA optimizations on single-node/UMA systems - UseNUMA = ForceNUMA; - } - } - } - - Solaris::signal_sets_init(); - Solaris::init_signal_mem(); - Solaris::install_signal_handlers(); - // Initialize data for jdk.internal.misc.Signal - if (!ReduceSignalUsage) { - jdk_misc_signal_init(); - } - - // initialize synchronization primitives to use either thread or - // lwp synchronization (controlled by UseLWPSynchronization) - Solaris::synchronization_init(); - DEBUG_ONLY(os::set_mutex_init_done();) - - if (MaxFDLimit) { - // set the number of file descriptors to max. print out error - // if getrlimit/setrlimit fails but continue regardless. - struct rlimit nbr_files; - int status = getrlimit(RLIMIT_NOFILE, &nbr_files); - if (status != 0) { - log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); - } else { - nbr_files.rlim_cur = nbr_files.rlim_max; - status = setrlimit(RLIMIT_NOFILE, &nbr_files); - if (status != 0) { - log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); - } - } - } - - // Calculate theoretical max. size of Threads to guard gainst - // artifical out-of-memory situations, where all available address- - // space has been reserved by thread stacks. Default stack size is 1Mb. - size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? - JavaThread::stack_size_at_create() : (1*K*K); - assert(pre_thread_stack_size != 0, "Must have a stack"); - // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when - // we should start doing Virtual Memory banging. Currently when the threads will - // have used all but 200Mb of space. - size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); - Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; - - // at-exit methods are called in the reverse order of their registration. - // In Solaris 7 and earlier, atexit functions are called on return from - // main or as a result of a call to exit(3C). There can be only 32 of - // these functions registered and atexit() does not set errno. In Solaris - // 8 and later, there is no limit to the number of functions registered - // and atexit() sets errno. In addition, in Solaris 8 and later, atexit - // functions are called upon dlclose(3DL) in addition to return from main - // and exit(3C). - - if (PerfAllowAtExitRegistration) { - // only register atexit functions if PerfAllowAtExitRegistration is set. - // atexit functions can be delayed until process exit time, which - // can be problematic for embedded VM situations. Embedded VMs should - // call DestroyJavaVM() to assure that VM resources are released. - - // note: perfMemory_exit_helper atexit function may be removed in - // the future if the appropriate cleanup code can be added to the - // VM_Exit VMOperation's doit method. - if (atexit(perfMemory_exit_helper) != 0) { - warning("os::init2 atexit(perfMemory_exit_helper) failed"); - } - } - - // Init pset_loadavg function pointer - init_pset_getloadavg_ptr(); - - // Shared Posix initialization - os::Posix::init_2(); - - return JNI_OK; -} - -// Is a (classpath) directory empty? -bool os::dir_is_empty(const char* path) { - DIR *dir = NULL; - struct dirent *ptr; - - dir = opendir(path); - if (dir == NULL) return true; - - // Scan the directory - bool result = true; - while (result && (ptr = readdir(dir)) != NULL) { - if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { - result = false; - } - } - closedir(dir); - return result; -} - -// This code originates from JDK's sysOpen and open64_w -// from src/solaris/hpi/src/system_md.c - -int os::open(const char *path, int oflag, int mode) { - if (strlen(path) > MAX_PATH - 1) { - errno = ENAMETOOLONG; - return -1; - } - int fd; - - fd = ::open64(path, oflag, mode); - if (fd == -1) return -1; - - // If the open succeeded, the file might still be a directory - { - struct stat64 buf64; - int ret = ::fstat64(fd, &buf64); - int st_mode = buf64.st_mode; - - if (ret != -1) { - if ((st_mode & S_IFMT) == S_IFDIR) { - errno = EISDIR; - ::close(fd); - return -1; - } - } else { - ::close(fd); - return -1; - } - } - - // 32-bit Solaris systems suffer from: - // - // - an historical default soft limit of 256 per-process file - // descriptors that is too low for many Java programs. - // - // - a design flaw where file descriptors created using stdio - // fopen must be less than 256, _even_ when the first limit above - // has been raised. This can cause calls to fopen (but not calls to - // open, for example) to fail mysteriously, perhaps in 3rd party - // native code (although the JDK itself uses fopen). One can hardly - // criticize them for using this most standard of all functions. - // - // We attempt to make everything work anyways by: - // - // - raising the soft limit on per-process file descriptors beyond - // 256 - // - // - As of Solaris 10u4, we can request that Solaris raise the 256 - // stdio fopen limit by calling function enable_extended_FILE_stdio. - // This is done in init_2 and recorded in enabled_extended_FILE_stdio - // - // - If we are stuck on an old (pre 10u4) Solaris system, we can - // workaround the bug by remapping non-stdio file descriptors below - // 256 to ones beyond 256, which is done below. - // - // See: - // 1085341: 32-bit stdio routines should support file descriptors >255 - // 6533291: Work around 32-bit Solaris stdio limit of 256 open files - // 6431278: Netbeans crash on 32 bit Solaris: need to call - // enable_extended_FILE_stdio() in VM initialisation - // Giri Mandalika's blog - // http://technopark02.blogspot.com/2005_05_01_archive.html - // -#ifndef _LP64 - if ((!enabled_extended_FILE_stdio) && fd < 256) { - int newfd = ::fcntl(fd, F_DUPFD, 256); - if (newfd != -1) { - ::close(fd); - fd = newfd; - } - } -#endif // 32-bit Solaris - - // All file descriptors that are opened in the JVM and not - // specifically destined for a subprocess should have the - // close-on-exec flag set. If we don't set it, then careless 3rd - // party native code might fork and exec without closing all - // appropriate file descriptors (e.g. as we do in closeDescriptors in - // UNIXProcess.c), and this in turn might: - // - // - cause end-of-file to fail to be detected on some file - // descriptors, resulting in mysterious hangs, or - // - // - might cause an fopen in the subprocess to fail on a system - // suffering from bug 1085341. - // - // (Yes, the default setting of the close-on-exec flag is a Unix - // design flaw) - // - // See: - // 1085341: 32-bit stdio routines should support file descriptors >255 - // 4843136: (process) pipe file descriptor from Runtime.exec not being closed - // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 - // -#ifdef FD_CLOEXEC - { - int flags = ::fcntl(fd, F_GETFD); - if (flags != -1) { - ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); - } - } -#endif - - return fd; -} - -// create binary file, rewriting existing file if required -int os::create_binary_file(const char* path, bool rewrite_existing) { - int oflags = O_WRONLY | O_CREAT; - if (!rewrite_existing) { - oflags |= O_EXCL; - } - return ::open64(path, oflags, S_IREAD | S_IWRITE); -} - -// return current position of file pointer -jlong os::current_file_offset(int fd) { - return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); -} - -// move file pointer to the specified offset -jlong os::seek_to_file_offset(int fd, jlong offset) { - return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); -} - -jlong os::lseek(int fd, jlong offset, int whence) { - return (jlong) ::lseek64(fd, offset, whence); -} - -int os::ftruncate(int fd, jlong length) { - return ::ftruncate64(fd, length); -} - -int os::fsync(int fd) { - RESTARTABLE_RETURN_INT(::fsync(fd)); -} - -int os::available(int fd, jlong *bytes) { - assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, - "Assumed _thread_in_native"); - jlong cur, end; - int mode; - struct stat64 buf64; - - if (::fstat64(fd, &buf64) >= 0) { - mode = buf64.st_mode; - if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { - int n,ioctl_return; - - RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); - if (ioctl_return>= 0) { - *bytes = n; - return 1; - } - } - } - if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { - return 0; - } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { - return 0; - } else if (::lseek64(fd, cur, SEEK_SET) == -1) { - return 0; - } - *bytes = end - cur; - return 1; -} - -// Map a block of memory. -char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, - char *addr, size_t bytes, bool read_only, - bool allow_exec) { - int prot; - int flags; - - if (read_only) { - prot = PROT_READ; - flags = MAP_SHARED; - } else { - prot = PROT_READ | PROT_WRITE; - flags = MAP_PRIVATE; - } - - if (allow_exec) { - prot |= PROT_EXEC; - } - - if (addr != NULL) { - flags |= MAP_FIXED; - } - - char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, - fd, file_offset); - if (mapped_address == MAP_FAILED) { - return NULL; - } - return mapped_address; -} - - -// Remap a block of memory. -char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, - char *addr, size_t bytes, bool read_only, - bool allow_exec) { - // same as map_memory() on this OS - return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, - allow_exec); -} - - -// Unmap a block of memory. -bool os::pd_unmap_memory(char* addr, size_t bytes) { - return munmap(addr, bytes) == 0; -} - -void os::pause() { - char filename[MAX_PATH]; - if (PauseAtStartupFile && PauseAtStartupFile[0]) { - jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); - } else { - jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); - } - - int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); - if (fd != -1) { - struct stat buf; - ::close(fd); - while (::stat(filename, &buf) == 0) { - (void)::poll(NULL, 0, 100); - } - } else { - jio_fprintf(stderr, - "Could not open pause file '%s', continuing immediately.\n", filename); - } -} - -#ifndef PRODUCT -#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS -// Turn this on if you need to trace synch operations. -// Set RECORD_SYNCH_LIMIT to a large-enough value, -// and call record_synch_enable and record_synch_disable -// around the computation of interest. - -void record_synch(char* name, bool returning); // defined below - -class RecordSynch { - char* _name; - public: - RecordSynch(char* name) :_name(name) { record_synch(_name, false); } - ~RecordSynch() { record_synch(_name, true); } -}; - -#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ -extern "C" ret name params { \ - typedef ret name##_t params; \ - static name##_t* implem = NULL; \ - static int callcount = 0; \ - if (implem == NULL) { \ - implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ - if (implem == NULL) fatal(dlerror()); \ - } \ - ++callcount; \ - RecordSynch _rs(#name); \ - inner; \ - return implem args; \ -} -// in dbx, examine callcounts this way: -// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done - -#define CHECK_POINTER_OK(p) \ - (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) -#define CHECK_MU \ - if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); -#define CHECK_CV \ - if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); -#define CHECK_P(p) \ - if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); - -#define CHECK_MUTEX(mutex_op) \ - CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); - -CHECK_MUTEX( mutex_lock) -CHECK_MUTEX( _mutex_lock) -CHECK_MUTEX( mutex_unlock) -CHECK_MUTEX(_mutex_unlock) -CHECK_MUTEX( mutex_trylock) -CHECK_MUTEX(_mutex_trylock) - -#define CHECK_COND(cond_op) \ - CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); - -CHECK_COND( cond_wait); -CHECK_COND(_cond_wait); -CHECK_COND(_cond_wait_cancel); - -#define CHECK_COND2(cond_op) \ - CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); - -CHECK_COND2( cond_timedwait); -CHECK_COND2(_cond_timedwait); -CHECK_COND2(_cond_timedwait_cancel); - -// do the _lwp_* versions too -#define mutex_t lwp_mutex_t -#define cond_t lwp_cond_t -CHECK_MUTEX( _lwp_mutex_lock) -CHECK_MUTEX( _lwp_mutex_unlock) -CHECK_MUTEX( _lwp_mutex_trylock) -CHECK_MUTEX( __lwp_mutex_lock) -CHECK_MUTEX( __lwp_mutex_unlock) -CHECK_MUTEX( __lwp_mutex_trylock) -CHECK_MUTEX(___lwp_mutex_lock) -CHECK_MUTEX(___lwp_mutex_unlock) - -CHECK_COND( _lwp_cond_wait); -CHECK_COND( __lwp_cond_wait); -CHECK_COND(___lwp_cond_wait); - -CHECK_COND2( _lwp_cond_timedwait); -CHECK_COND2( __lwp_cond_timedwait); -#undef mutex_t -#undef cond_t - -CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); -CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); -CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); -CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); -CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); -CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); -CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); -CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); - - -// recording machinery: - -enum { RECORD_SYNCH_LIMIT = 200 }; -char* record_synch_name[RECORD_SYNCH_LIMIT]; -void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; -bool record_synch_returning[RECORD_SYNCH_LIMIT]; -thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; -int record_synch_count = 0; -bool record_synch_enabled = false; - -// in dbx, examine recorded data this way: -// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done - -void record_synch(char* name, bool returning) { - if (record_synch_enabled) { - if (record_synch_count < RECORD_SYNCH_LIMIT) { - record_synch_name[record_synch_count] = name; - record_synch_returning[record_synch_count] = returning; - record_synch_thread[record_synch_count] = thr_self(); - record_synch_arg0ptr[record_synch_count] = &name; - record_synch_count++; - } - // put more checking code here: - // ... - } -} - -void record_synch_enable() { - // start collecting trace data, if not already doing so - if (!record_synch_enabled) record_synch_count = 0; - record_synch_enabled = true; -} - -void record_synch_disable() { - // stop collecting trace data - record_synch_enabled = false; -} - -#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS -#endif // PRODUCT - -const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); -const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - - (intptr_t)(&((prusage_t *)(NULL))->pr_utime); - - -// JVMTI & JVM monitoring and management support -// The thread_cpu_time() and current_thread_cpu_time() are only -// supported if is_thread_cpu_time_supported() returns true. -// They are not supported on Solaris T1. - -// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) -// are used by JVM M&M and JVMTI to get user+sys or user CPU time -// of a thread. -// -// current_thread_cpu_time() and thread_cpu_time(Thread *) -// returns the fast estimate available on the platform. - -// hrtime_t gethrvtime() return value includes -// user time but does not include system time -jlong os::current_thread_cpu_time() { - return (jlong) gethrvtime(); -} - -jlong os::thread_cpu_time(Thread *thread) { - // return user level CPU time only to be consistent with - // what current_thread_cpu_time returns. - // thread_cpu_time_info() must be changed if this changes - return os::thread_cpu_time(thread, false /* user time only */); -} - -jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { - if (user_sys_cpu_time) { - return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); - } else { - return os::current_thread_cpu_time(); - } -} - -jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { - char proc_name[64]; - int count; - prusage_t prusage; - jlong lwp_time; - int fd; - - sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", - getpid(), - thread->osthread()->lwp_id()); - fd = ::open(proc_name, O_RDONLY); - if (fd == -1) return -1; - - do { - count = ::pread(fd, - (void *)&prusage.pr_utime, - thr_time_size, - thr_time_off); - } while (count < 0 && errno == EINTR); - ::close(fd); - if (count < 0) return -1; - - if (user_sys_cpu_time) { - // user + system CPU time - lwp_time = (((jlong)prusage.pr_stime.tv_sec + - (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + - (jlong)prusage.pr_stime.tv_nsec + - (jlong)prusage.pr_utime.tv_nsec; - } else { - // user level CPU time only - lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + - (jlong)prusage.pr_utime.tv_nsec; - } - - return (lwp_time); -} - -void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { - info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits - info_ptr->may_skip_backward = false; // elapsed time not wall time - info_ptr->may_skip_forward = false; // elapsed time not wall time - info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned -} - -void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { - info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits - info_ptr->may_skip_backward = false; // elapsed time not wall time - info_ptr->may_skip_forward = false; // elapsed time not wall time - info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned -} - -bool os::is_thread_cpu_time_supported() { - return true; -} - -// System loadavg support. Returns -1 if load average cannot be obtained. -// Return the load average for our processor set if the primitive exists -// (Solaris 9 and later). Otherwise just return system wide loadavg. -int os::loadavg(double loadavg[], int nelem) { - if (pset_getloadavg_ptr != NULL) { - return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); - } else { - return ::getloadavg(loadavg, nelem); - } -} - -//--------------------------------------------------------------------------------- - -bool os::find(address addr, outputStream* st) { - Dl_info dlinfo; - memset(&dlinfo, 0, sizeof(dlinfo)); - if (dladdr(addr, &dlinfo) != 0) { - st->print(PTR_FORMAT ": ", addr); - if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { - st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); - } else if (dlinfo.dli_fbase != NULL) { - st->print("", addr-(intptr_t)dlinfo.dli_fbase); - } else { - st->print(""); - } - if (dlinfo.dli_fname != NULL) { - st->print(" in %s", dlinfo.dli_fname); - } - if (dlinfo.dli_fbase != NULL) { - st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); - } - st->cr(); - - if (Verbose) { - // decode some bytes around the PC - address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); - address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); - address lowest = (address) dlinfo.dli_sname; - if (!lowest) lowest = (address) dlinfo.dli_fbase; - if (begin < lowest) begin = lowest; - Dl_info dlinfo2; - if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr - && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { - end = (address) dlinfo2.dli_saddr; - } - Disassembler::decode(begin, end, st); - } - return true; - } - return false; -} - -// Following function has been added to support HotSparc's libjvm.so running -// under Solaris production JDK 1.2.2 / 1.3.0. These came from -// src/solaris/hpi/native_threads in the EVM codebase. -// -// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release -// libraries and should thus be removed. We will leave it behind for a while -// until we no longer want to able to run on top of 1.3.0 Solaris production -// JDK. See 4341971. - -#define STACK_SLACK 0x800 - -extern "C" { - intptr_t sysThreadAvailableStackWithSlack() { - stack_t st; - intptr_t retval, stack_top; - retval = thr_stksegment(&st); - assert(retval == 0, "incorrect return value from thr_stksegment"); - assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); - assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); - stack_top=(intptr_t)st.ss_sp-st.ss_size; - return ((intptr_t)&stack_top - stack_top - STACK_SLACK); - } -} - -// ObjectMonitor park-unpark infrastructure ... -// -// We implement Solaris and Linux PlatformEvents with the -// obvious condvar-mutex-flag triple. -// Another alternative that works quite well is pipes: -// Each PlatformEvent consists of a pipe-pair. -// The thread associated with the PlatformEvent -// calls park(), which reads from the input end of the pipe. -// Unpark() writes into the other end of the pipe. -// The write-side of the pipe must be set NDELAY. -// Unfortunately pipes consume a large # of handles. -// Native solaris lwp_park() and lwp_unpark() work nicely, too. -// Using pipes for the 1st few threads might be workable, however. -// -// park() is permitted to return spuriously. -// Callers of park() should wrap the call to park() in -// an appropriate loop. A litmus test for the correct -// usage of park is the following: if park() were modified -// to immediately return 0 your code should still work, -// albeit degenerating to a spin loop. -// -// In a sense, park()-unpark() just provides more polite spinning -// and polling with the key difference over naive spinning being -// that a parked thread needs to be explicitly unparked() in order -// to wake up and to poll the underlying condition. -// -// Assumption: -// Only one parker can exist on an event, which is why we allocate -// them per-thread. Multiple unparkers can coexist. -// -// _Event transitions in park() -// -1 => -1 : illegal -// 1 => 0 : pass - return immediately -// 0 => -1 : block; then set _Event to 0 before returning -// -// _Event transitions in unpark() -// 0 => 1 : just return -// 1 => 1 : just return -// -1 => either 0 or 1; must signal target thread -// That is, we can safely transition _Event from -1 to either -// 0 or 1. -// -// _Event serves as a restricted-range semaphore. -// -1 : thread is blocked, i.e. there is a waiter -// 0 : neutral: thread is running or ready, -// could have been signaled after a wait started -// 1 : signaled - thread is running or ready -// -// Another possible encoding of _Event would be with -// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. -// -// TODO-FIXME: add DTRACE probes for: -// 1. Tx parks -// 2. Ty unparks Tx -// 3. Tx resumes from park - - -// value determined through experimentation -#define ROUNDINGFIX 11 - -// utility to compute the abstime argument to timedwait. -// TODO-FIXME: switch from compute_abstime() to unpackTime(). - -static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { - // millis is the relative timeout time - // abstime will be the absolute timeout time - if (millis < 0) millis = 0; - struct timeval now; - int status = gettimeofday(&now, NULL); - assert(status == 0, "gettimeofday"); - jlong seconds = millis / 1000; - jlong max_wait_period; - - if (UseLWPSynchronization) { - // forward port of fix for 4275818 (not sleeping long enough) - // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where - // _lwp_cond_timedwait() used a round_down algorithm rather - // than a round_up. For millis less than our roundfactor - // it rounded down to 0 which doesn't meet the spec. - // For millis > roundfactor we may return a bit sooner, but - // since we can not accurately identify the patch level and - // this has already been fixed in Solaris 9 and 8 we will - // leave it alone rather than always rounding down. - - if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; - // It appears that when we go directly through Solaris _lwp_cond_timedwait() - // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 - max_wait_period = 21000000; - } else { - max_wait_period = 50000000; - } - millis %= 1000; - if (seconds > max_wait_period) { // see man cond_timedwait(3T) - seconds = max_wait_period; - } - abstime->tv_sec = now.tv_sec + seconds; - long usec = now.tv_usec + millis * 1000; - if (usec >= 1000000) { - abstime->tv_sec += 1; - usec -= 1000000; - } - abstime->tv_nsec = usec * 1000; - return abstime; -} - -void os::PlatformEvent::park() { // AKA: down() - // Transitions for _Event: - // -1 => -1 : illegal - // 1 => 0 : pass - return immediately - // 0 => -1 : block; then set _Event to 0 before returning - - // Invariant: Only the thread associated with the Event/PlatformEvent - // may call park(). - assert(_nParked == 0, "invariant"); - - int v; - for (;;) { - v = _Event; - if (Atomic::cmpxchg(&_Event, v, v-1) == v) break; - } - guarantee(v >= 0, "invariant"); - if (v == 0) { - // Do this the hard way by blocking ... - // See http://monaco.sfbay/detail.jsf?cr=5094058. - int status = os::Solaris::mutex_lock(_mutex); - assert_status(status == 0, status, "mutex_lock"); - guarantee(_nParked == 0, "invariant"); - ++_nParked; - while (_Event < 0) { - // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... - // Treat this the same as if the wait was interrupted - // With usr/lib/lwp going to kernel, always handle ETIME - status = os::Solaris::cond_wait(_cond, _mutex); - if (status == ETIME) status = EINTR; - assert_status(status == 0 || status == EINTR, status, "cond_wait"); - } - --_nParked; - _Event = 0; - status = os::Solaris::mutex_unlock(_mutex); - assert_status(status == 0, status, "mutex_unlock"); - // Paranoia to ensure our locked and lock-free paths interact - // correctly with each other. - OrderAccess::fence(); - } -} - -int os::PlatformEvent::park(jlong millis) { - // Transitions for _Event: - // -1 => -1 : illegal - // 1 => 0 : pass - return immediately - // 0 => -1 : block; then set _Event to 0 before returning - - guarantee(_nParked == 0, "invariant"); - int v; - for (;;) { - v = _Event; - if (Atomic::cmpxchg(&_Event, v, v-1) == v) break; - } - guarantee(v >= 0, "invariant"); - if (v != 0) return OS_OK; - - int ret = OS_TIMEOUT; - timestruc_t abst; - compute_abstime(&abst, millis); - - // See http://monaco.sfbay/detail.jsf?cr=5094058. - int status = os::Solaris::mutex_lock(_mutex); - assert_status(status == 0, status, "mutex_lock"); - guarantee(_nParked == 0, "invariant"); - ++_nParked; - while (_Event < 0) { - int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); - assert_status(status == 0 || status == EINTR || - status == ETIME || status == ETIMEDOUT, - status, "cond_timedwait"); - if (!FilterSpuriousWakeups) break; // previous semantics - if (status == ETIME || status == ETIMEDOUT) break; - // We consume and ignore EINTR and spurious wakeups. - } - --_nParked; - if (_Event >= 0) ret = OS_OK; - _Event = 0; - status = os::Solaris::mutex_unlock(_mutex); - assert_status(status == 0, status, "mutex_unlock"); - // Paranoia to ensure our locked and lock-free paths interact - // correctly with each other. - OrderAccess::fence(); - return ret; -} - -void os::PlatformEvent::unpark() { - // Transitions for _Event: - // 0 => 1 : just return - // 1 => 1 : just return - // -1 => either 0 or 1; must signal target thread - // That is, we can safely transition _Event from -1 to either - // 0 or 1. - // See also: "Semaphores in Plan 9" by Mullender & Cox - // - // Note: Forcing a transition from "-1" to "1" on an unpark() means - // that it will take two back-to-back park() calls for the owning - // thread to block. This has the benefit of forcing a spurious return - // from the first park() call after an unpark() call which will help - // shake out uses of park() and unpark() without condition variables. - - if (Atomic::xchg(&_Event, 1) >= 0) return; - - // If the thread associated with the event was parked, wake it. - // Wait for the thread assoc with the PlatformEvent to vacate. - int status = os::Solaris::mutex_lock(_mutex); - assert_status(status == 0, status, "mutex_lock"); - int AnyWaiters = _nParked; - status = os::Solaris::mutex_unlock(_mutex); - assert_status(status == 0, status, "mutex_unlock"); - guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); - if (AnyWaiters != 0) { - // Note that we signal() *after* dropping the lock for "immortal" Events. - // This is safe and avoids a common class of futile wakeups. In rare - // circumstances this can cause a thread to return prematurely from - // cond_{timed}wait() but the spurious wakeup is benign and the victim - // will simply re-test the condition and re-park itself. - // This provides particular benefit if the underlying platform does not - // provide wait morphing. - status = os::Solaris::cond_signal(_cond); - assert_status(status == 0, status, "cond_signal"); - } -} - -// JSR166 -// ------------------------------------------------------- - -// The solaris and linux implementations of park/unpark are fairly -// conservative for now, but can be improved. They currently use a -// mutex/condvar pair, plus _counter. -// Park decrements _counter if > 0, else does a condvar wait. Unpark -// sets count to 1 and signals condvar. Only one thread ever waits -// on the condvar. Contention seen when trying to park implies that someone -// is unparking you, so don't wait. And spurious returns are fine, so there -// is no need to track notifications. - -#define MAX_SECS 100000000 - -// This code is common to linux and solaris and will be moved to a -// common place in dolphin. -// -// The passed in time value is either a relative time in nanoseconds -// or an absolute time in milliseconds. Either way it has to be unpacked -// into suitable seconds and nanoseconds components and stored in the -// given timespec structure. -// Given time is a 64-bit value and the time_t used in the timespec is only -// a signed-32-bit value (except on 64-bit Linux) we have to watch for -// overflow if times way in the future are given. Further on Solaris versions -// prior to 10 there is a restriction (see cond_timedwait) that the specified -// number of seconds, in abstime, is less than current_time + 100,000,000. -// As it will be 28 years before "now + 100000000" will overflow we can -// ignore overflow and just impose a hard-limit on seconds using the value -// of "now + 100,000,000". This places a limit on the timeout of about 3.17 -// years from "now". -// -static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { - assert(time > 0, "convertTime"); - - struct timeval now; - int status = gettimeofday(&now, NULL); - assert(status == 0, "gettimeofday"); - - time_t max_secs = now.tv_sec + MAX_SECS; - - if (isAbsolute) { - jlong secs = time / 1000; - if (secs > max_secs) { - absTime->tv_sec = max_secs; - } else { - absTime->tv_sec = secs; - } - absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; - } else { - jlong secs = time / NANOSECS_PER_SEC; - if (secs >= MAX_SECS) { - absTime->tv_sec = max_secs; - absTime->tv_nsec = 0; - } else { - absTime->tv_sec = now.tv_sec + secs; - absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; - if (absTime->tv_nsec >= NANOSECS_PER_SEC) { - absTime->tv_nsec -= NANOSECS_PER_SEC; - ++absTime->tv_sec; // note: this must be <= max_secs - } - } - } - assert(absTime->tv_sec >= 0, "tv_sec < 0"); - assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); - assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); - assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); -} - -void Parker::park(bool isAbsolute, jlong time) { - // Ideally we'd do something useful while spinning, such - // as calling unpackTime(). - - // Optional fast-path check: - // Return immediately if a permit is available. - // We depend on Atomic::xchg() having full barrier semantics - // since we are doing a lock-free update to _counter. - if (Atomic::xchg(&_counter, 0) > 0) return; - - // Optional fast-exit: Check interrupt before trying to wait - Thread* thread = Thread::current(); - assert(thread->is_Java_thread(), "Must be JavaThread"); - JavaThread *jt = (JavaThread *)thread; - if (jt->is_interrupted(false)) { - return; - } - - // First, demultiplex/decode time arguments - timespec absTime; - if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all - return; - } - if (time > 0) { - // Warning: this code might be exposed to the old Solaris time - // round-down bugs. Grep "roundingFix" for details. - unpackTime(&absTime, isAbsolute, time); - } - - // Enter safepoint region - // Beware of deadlocks such as 6317397. - // The per-thread Parker:: _mutex is a classic leaf-lock. - // In particular a thread must never block on the Threads_lock while - // holding the Parker:: mutex. If safepoints are pending both the - // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. - ThreadBlockInVM tbivm(jt); - - // Can't access interrupt state now that we are _thread_blocked. If we've - // been interrupted since we checked above then _counter will be > 0. - - // Don't wait if cannot get lock since interference arises from - // unblocking. - if (os::Solaris::mutex_trylock(_mutex) != 0) { - return; - } - - int status; - - if (_counter > 0) { // no wait needed - _counter = 0; - status = os::Solaris::mutex_unlock(_mutex); - assert(status == 0, "invariant"); - // Paranoia to ensure our locked and lock-free paths interact - // correctly with each other and Java-level accesses. - OrderAccess::fence(); - return; - } - - OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); - jt->set_suspend_equivalent(); - // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() - - // Do this the hard way by blocking ... - // See http://monaco.sfbay/detail.jsf?cr=5094058. - if (time == 0) { - status = os::Solaris::cond_wait(_cond, _mutex); - } else { - status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); - } - // Note that an untimed cond_wait() can sometimes return ETIME on older - // versions of the Solaris. - assert_status(status == 0 || status == EINTR || - status == ETIME || status == ETIMEDOUT, - status, "cond_timedwait"); - - _counter = 0; - status = os::Solaris::mutex_unlock(_mutex); - assert_status(status == 0, status, "mutex_unlock"); - // Paranoia to ensure our locked and lock-free paths interact - // correctly with each other and Java-level accesses. - OrderAccess::fence(); - - // If externally suspended while waiting, re-suspend - if (jt->handle_special_suspend_equivalent_condition()) { - jt->java_suspend_self(); - } -} - -void Parker::unpark() { - int status = os::Solaris::mutex_lock(_mutex); - assert(status == 0, "invariant"); - const int s = _counter; - _counter = 1; - status = os::Solaris::mutex_unlock(_mutex); - assert(status == 0, "invariant"); - - if (s < 1) { - status = os::Solaris::cond_signal(_cond); - assert(status == 0, "invariant"); - } -} - -// Platform Mutex/Monitor implementations - -os::PlatformMutex::PlatformMutex() { - int status = os::Solaris::mutex_init(&_mutex); - assert_status(status == 0, status, "mutex_init"); -} - -os::PlatformMutex::~PlatformMutex() { - int status = os::Solaris::mutex_destroy(&_mutex); - assert_status(status == 0, status, "mutex_destroy"); -} - -void os::PlatformMutex::lock() { - int status = os::Solaris::mutex_lock(&_mutex); - assert_status(status == 0, status, "mutex_lock"); -} - -void os::PlatformMutex::unlock() { - int status = os::Solaris::mutex_unlock(&_mutex); - assert_status(status == 0, status, "mutex_unlock"); -} - -bool os::PlatformMutex::try_lock() { - int status = os::Solaris::mutex_trylock(&_mutex); - assert_status(status == 0 || status == EBUSY, status, "mutex_trylock"); - return status == 0; -} - -os::PlatformMonitor::PlatformMonitor() { - int status = os::Solaris::cond_init(&_cond); - assert_status(status == 0, status, "cond_init"); -} - -os::PlatformMonitor::~PlatformMonitor() { - int status = os::Solaris::cond_destroy(&_cond); - assert_status(status == 0, status, "cond_destroy"); -} - -// Must already be locked -int os::PlatformMonitor::wait(jlong millis) { - assert(millis >= 0, "negative timeout"); - if (millis > 0) { - timestruc_t abst; - int ret = OS_TIMEOUT; - compute_abstime(&abst, millis); - int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst); - assert_status(status == 0 || status == EINTR || - status == ETIME || status == ETIMEDOUT, - status, "cond_timedwait"); - // EINTR acts as spurious wakeup - which is permitted anyway - if (status == 0 || status == EINTR) { - ret = OS_OK; - } - return ret; - } else { - int status = os::Solaris::cond_wait(&_cond, &_mutex); - assert_status(status == 0 || status == EINTR, - status, "cond_wait"); - return OS_OK; - } -} - -void os::PlatformMonitor::notify() { - int status = os::Solaris::cond_signal(&_cond); - assert_status(status == 0, status, "cond_signal"); -} - -void os::PlatformMonitor::notify_all() { - int status = os::Solaris::cond_broadcast(&_cond); - assert_status(status == 0, status, "cond_broadcast"); -} - -extern char** environ; - -// Run the specified command in a separate process. Return its exit value, -// or -1 on failure (e.g. can't fork a new process). -// Unlike system(), this function can be called from signal handler. It -// doesn't block SIGINT et al. -int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { - char * argv[4]; - argv[0] = (char *)"sh"; - argv[1] = (char *)"-c"; - argv[2] = cmd; - argv[3] = NULL; - - // fork is async-safe, fork1 is not so can't use in signal handler - pid_t pid; - Thread* t = Thread::current_or_null_safe(); - if (t != NULL && t->is_inside_signal_handler()) { - pid = fork(); - } else { - pid = fork1(); - } - - if (pid < 0) { - // fork failed - warning("fork failed: %s", os::strerror(errno)); - return -1; - - } else if (pid == 0) { - // child process - - // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris - execve("/usr/bin/sh", argv, environ); - - // execve failed - _exit(-1); - - } else { - // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't - // care about the actual exit code, for now. - - int status; - - // Wait for the child process to exit. This returns immediately if - // the child has already exited. */ - while (waitpid(pid, &status, 0) < 0) { - switch (errno) { - case ECHILD: return 0; - case EINTR: break; - default: return -1; - } - } - - if (WIFEXITED(status)) { - // The child exited normally; get its exit code. - return WEXITSTATUS(status); - } else if (WIFSIGNALED(status)) { - // The child exited because of a signal - // The best value to return is 0x80 + signal number, - // because that is what all Unix shells do, and because - // it allows callers to distinguish between process exit and - // process death by signal. - return 0x80 + WTERMSIG(status); - } else { - // Unknown exit code; pass it through - return status; - } - } -} - -size_t os::write(int fd, const void *buf, unsigned int nBytes) { - size_t res; - RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); - return res; -} - -int os::close(int fd) { - return ::close(fd); -} - -int os::socket_close(int fd) { - return ::close(fd); -} - -int os::recv(int fd, char* buf, size_t nBytes, uint flags) { - assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, - "Assumed _thread_in_native"); - RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); -} - -int os::send(int fd, char* buf, size_t nBytes, uint flags) { - assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, - "Assumed _thread_in_native"); - RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); -} - -int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { - RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); -} - -// As both poll and select can be interrupted by signals, we have to be -// prepared to restart the system call after updating the timeout, unless -// a poll() is done with timeout == -1, in which case we repeat with this -// "wait forever" value. - -int os::connect(int fd, struct sockaddr *him, socklen_t len) { - int _result; - _result = ::connect(fd, him, len); - - // On Solaris, when a connect() call is interrupted, the connection - // can be established asynchronously (see 6343810). Subsequent calls - // to connect() must check the errno value which has the semantic - // described below (copied from the connect() man page). Handling - // of asynchronously established connections is required for both - // blocking and non-blocking sockets. - // EINTR The connection attempt was interrupted - // before any data arrived by the delivery of - // a signal. The connection, however, will be - // established asynchronously. - // - // EINPROGRESS The socket is non-blocking, and the connec- - // tion cannot be completed immediately. - // - // EALREADY The socket is non-blocking, and a previous - // connection attempt has not yet been com- - // pleted. - // - // EISCONN The socket is already connected. - if (_result == OS_ERR && errno == EINTR) { - // restarting a connect() changes its errno semantics - RESTARTABLE(::connect(fd, him, len), _result); - // undo these changes - if (_result == OS_ERR) { - if (errno == EALREADY) { - errno = EINPROGRESS; // fall through - } else if (errno == EISCONN) { - errno = 0; - return OS_OK; - } - } - } - return _result; -} - -// Get the default path to the core file -// Returns the length of the string -int os::get_core_path(char* buffer, size_t bufferSize) { - const char* p = get_current_directory(buffer, bufferSize); - - if (p == NULL) { - assert(p != NULL, "failed to get current directory"); - return 0; - } - - jio_snprintf(buffer, bufferSize, "%s/core or core.%d", - p, current_process_id()); - - return strlen(buffer); -} - -bool os::supports_map_sync() { - return false; -} - -#ifndef PRODUCT -void TestReserveMemorySpecial_test() { - // No tests available for this platform -} -#endif - -bool os::start_debugging(char *buf, int buflen) { - int len = (int)strlen(buf); - char *p = &buf[len]; - - jio_snprintf(p, buflen-len, - "\n\n" - "Do you want to debug the problem?\n\n" - "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" - "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" - "Otherwise, press RETURN to abort...", - os::current_process_id(), os::current_thread_id()); - - bool yes = os::message_box("Unexpected Error", buf); - - if (yes) { - // yes, user asked VM to launch debugger - jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); - - os::fork_and_exec(buf); - yes = false; - } - return yes; -}