/* * Copyright (c) 1997, 2015, 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. * */ #ifndef OS_WINDOWS_VM_OS_WINDOWS_HPP #define OS_WINDOWS_VM_OS_WINDOWS_HPP // Win32_OS defines the interface to windows operating systems // Information about the protection of the page at address '0' on this os. static bool zero_page_read_protected() { return true; } // File conventions static const char* file_separator() { return "\\"; } static const char* line_separator() { return "\r\n"; } static const char* path_separator() { return ";"; } class win32 { friend class os; friend unsigned __stdcall thread_native_entry(class Thread*); protected: static int _vm_page_size; static int _vm_allocation_granularity; static int _processor_type; static int _processor_level; static julong _physical_memory; static size_t _default_stack_size; static bool _is_windows_server; static bool _has_exit_bug; static void print_windows_version(outputStream* st); public: // Windows-specific interface: static void initialize_system_info(); static void setmode_streams(); // Processor info as provided by NT static int processor_type() { return _processor_type; } static int processor_level() { return _processor_level; } static julong available_memory(); static julong physical_memory() { return _physical_memory; } // load dll from Windows system directory or Windows directory static HINSTANCE load_Windows_dll(const char* name, char *ebuf, int ebuflen); private: enum Ept { EPT_THREAD, EPT_PROCESS, EPT_PROCESS_DIE }; // Wrapper around _endthreadex(), exit() and _exit() static int exit_process_or_thread(Ept what, int exit_code); static void initialize_performance_counter(); public: // Generic interface: // Trace number of created threads static intx _os_thread_limit; static volatile intx _os_thread_count; // Tells whether this is a server version of Windows static bool is_windows_server() { return _is_windows_server; } // Tells whether there can be the race bug during process exit on this platform static bool has_exit_bug() { return _has_exit_bug; } // Returns the byte size of a virtual memory page static int vm_page_size() { return _vm_page_size; } // Returns the size in bytes of memory blocks which can be allocated. static int vm_allocation_granularity() { return _vm_allocation_granularity; } // Read the headers for the executable that started the current process into // the structure passed in (see winnt.h). static void read_executable_headers(PIMAGE_NT_HEADERS); // Default stack size for the current process. static size_t default_stack_size() { return _default_stack_size; } static bool get_frame_at_stack_banging_point(JavaThread* thread, struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr); #ifndef _WIN64 // A wrapper to install a structured exception handler for fast JNI accesors. static address fast_jni_accessor_wrapper(BasicType); #endif // filter function to ignore faults on serializations page static LONG WINAPI serialize_fault_filter(struct _EXCEPTION_POINTERS* e); // Fast access to current thread protected: static int _thread_ptr_offset; private: static void initialize_thread_ptr_offset(); public: static inline void set_thread_ptr_offset(int offset) { _thread_ptr_offset = offset; } static inline int get_thread_ptr_offset() { return _thread_ptr_offset; } }; static void write_memory_serialize_page_with_handler(JavaThread* thread) { // Due to chained nature of SEH handlers we have to be sure // that our handler is always last handler before an attempt to write // into serialization page - it can fault if we access this page // right in the middle of protect/unprotect sequence by remote // membar logic. // __try/__except are very lightweight operations (only several // instructions not affecting control flow directly on x86) // so we can use it here, on very time critical path __try { write_memory_serialize_page(thread); } __except (win32::serialize_fault_filter((_EXCEPTION_POINTERS*)_exception_info())) {} } /* * Crash protection for the watcher thread. Wrap the callback * with a __try { call() } * To be able to use this - don't take locks, don't rely on destructors, * don't make OS library calls, don't allocate memory, don't print, * don't call code that could leave the heap / memory in an inconsistent state, * or anything else where we are not in control if we suddenly jump out. */ class WatcherThreadCrashProtection : public StackObj { public: WatcherThreadCrashProtection(); bool call(os::CrashProtectionCallback& cb); }; class PlatformEvent : public CHeapObj { private: double CachePad [4] ; // increase odds that _Event is sole occupant of cache line volatile int _Event ; HANDLE _ParkHandle ; public: // TODO-FIXME: make dtor private ~PlatformEvent() { guarantee (0, "invariant") ; } public: PlatformEvent() { _Event = 0 ; _ParkHandle = CreateEvent (NULL, false, false, NULL) ; guarantee (_ParkHandle != NULL, "invariant") ; } // Exercise caution using reset() and fired() - they may require MEMBARs void reset() { _Event = 0 ; } int fired() { return _Event; } void park () ; void unpark () ; int park (jlong millis) ; } ; class PlatformParker : public CHeapObj { protected: HANDLE _ParkEvent ; public: ~PlatformParker () { guarantee (0, "invariant") ; } PlatformParker () { _ParkEvent = CreateEvent (NULL, true, false, NULL) ; guarantee (_ParkEvent != NULL, "invariant") ; } } ; #endif // OS_WINDOWS_VM_OS_WINDOWS_HPP