src/os/solaris/vm/osThread_solaris.cpp

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rev 4773 : 8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>

*** 1,7 **** /* ! * Copyright (c) 1998, 2010, 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. --- 1,7 ---- /* ! * Copyright (c) 1998, 2013, 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.
*** 39,225 **** void OSThread::pd_initialize() { _thread_id = 0; sigemptyset(&_caller_sigmask); - _current_callback = NULL; - _current_callback_lock = VM_Version::supports_compare_and_exchange() ? NULL - : new Mutex(Mutex::suspend_resume, "Callback_lock", true); - _saved_interrupt_thread_state = _thread_new; _vm_created_thread = false; } void OSThread::pd_destroy() { } - // Synchronous interrupt support - // - // _current_callback == NULL no pending callback - // == 1 callback_in_progress - // == other value pointer to the pending callback - // - - // CAS on v8 is implemented by using a global atomic_memory_operation_lock, - // which is shared by other atomic functions. It is OK for normal uses, but - // dangerous if used after some thread is suspended or if used in signal - // handlers. Instead here we use a special per-thread lock to synchronize - // updating _current_callback if we are running on v8. Note in general trying - // to grab locks after a thread is suspended is not safe, but it is safe for - // updating _current_callback, because synchronous interrupt callbacks are - // currently only used in: - // 1. GetThreadPC_Callback - used by WatcherThread to profile VM thread - // There is no overlap between the callbacks, which means we won't try to - // grab a thread's sync lock after the thread has been suspended while holding - // the same lock. - - // used after a thread is suspended - static intptr_t compare_and_exchange_current_callback ( - intptr_t callback, intptr_t *addr, intptr_t compare_value, Mutex *sync) { - if (VM_Version::supports_compare_and_exchange()) { - return Atomic::cmpxchg_ptr(callback, addr, compare_value); - } else { - MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); - if (*addr == compare_value) { - *addr = callback; - return compare_value; - } else { - return callback; - } - } - } - - // used in signal handler - static intptr_t exchange_current_callback(intptr_t callback, intptr_t *addr, Mutex *sync) { - if (VM_Version::supports_compare_and_exchange()) { - return Atomic::xchg_ptr(callback, addr); - } else { - MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); - intptr_t cb = *addr; - *addr = callback; - return cb; - } - } - - // one interrupt at a time. spin if _current_callback != NULL - int OSThread::set_interrupt_callback(Sync_Interrupt_Callback * cb) { - int count = 0; - while (compare_and_exchange_current_callback( - (intptr_t)cb, (intptr_t *)&_current_callback, (intptr_t)NULL, _current_callback_lock) != NULL) { - while (_current_callback != NULL) { - count++; - #ifdef ASSERT - if ((WarnOnStalledSpinLock > 0) && - (count % WarnOnStalledSpinLock == 0)) { - warning("_current_callback seems to be stalled: %p", _current_callback); - } - #endif - os::yield_all(count); - } - } - return 0; - } - - // reset _current_callback, spin if _current_callback is callback_in_progress - void OSThread::remove_interrupt_callback(Sync_Interrupt_Callback * cb) { - int count = 0; - while (compare_and_exchange_current_callback( - (intptr_t)NULL, (intptr_t *)&_current_callback, (intptr_t)cb, _current_callback_lock) != (intptr_t)cb) { - #ifdef ASSERT - intptr_t p = (intptr_t)_current_callback; - assert(p == (intptr_t)callback_in_progress || - p == (intptr_t)cb, "wrong _current_callback value"); - #endif - while (_current_callback != cb) { - count++; - #ifdef ASSERT - if ((WarnOnStalledSpinLock > 0) && - (count % WarnOnStalledSpinLock == 0)) { - warning("_current_callback seems to be stalled: %p", _current_callback); - } - #endif - os::yield_all(count); - } - } - } - - void OSThread::do_interrupt_callbacks_at_interrupt(InterruptArguments *args) { - Sync_Interrupt_Callback * cb; - cb = (Sync_Interrupt_Callback *)exchange_current_callback( - (intptr_t)callback_in_progress, (intptr_t *)&_current_callback, _current_callback_lock); - - if (cb == NULL) { - // signal is delivered too late (thread is masking interrupt signal??). - // there is nothing we need to do because requesting thread has given up. - } else if ((intptr_t)cb == (intptr_t)callback_in_progress) { - fatal("invalid _current_callback state"); - } else { - assert(cb->target()->osthread() == this, "wrong target"); - cb->execute(args); - cb->leave_callback(); // notify the requester - } - - // restore original _current_callback value - intptr_t p; - p = exchange_current_callback((intptr_t)cb, (intptr_t *)&_current_callback, _current_callback_lock); - assert(p == (intptr_t)callback_in_progress, "just checking"); - } - - // Called by the requesting thread to send a signal to target thread and - // execute "this" callback from the signal handler. - int OSThread::Sync_Interrupt_Callback::interrupt(Thread * target, int timeout) { - // Let signals to the vm_thread go even if the Threads_lock is not acquired - assert(Threads_lock->owned_by_self() || (target == VMThread::vm_thread()), - "must have threads lock to call this"); - - OSThread * osthread = target->osthread(); - - // may block if target thread already has a pending callback - osthread->set_interrupt_callback(this); - - _target = target; - - int rslt = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); - assert(rslt == 0, "thr_kill != 0"); - - bool status = false; - jlong t1 = os::javaTimeMillis(); - { // don't use safepoint check because we might be the watcher thread. - MutexLockerEx ml(_sync, Mutex::_no_safepoint_check_flag); - while (!is_done()) { - status = _sync->wait(Mutex::_no_safepoint_check_flag, timeout); - - // status == true if timed out - if (status) break; - - // update timeout - jlong t2 = os::javaTimeMillis(); - timeout -= t2 - t1; - t1 = t2; - } - } - - // reset current_callback - osthread->remove_interrupt_callback(this); - - return status; - } - - void OSThread::Sync_Interrupt_Callback::leave_callback() { - if (!_sync->owned_by_self()) { - // notify requesting thread - MutexLockerEx ml(_sync, Mutex::_no_safepoint_check_flag); - _is_done = true; - _sync->notify_all(); - } else { - // Current thread is interrupted while it is holding the _sync lock, trying - // to grab it again will deadlock. The requester will timeout anyway, - // so just return. - _is_done = true; - } - } - // copied from synchronizer.cpp void OSThread::handle_spinlock_contention(int tries) { if (NoYieldsInMicrolock) return; --- 39,55 ----
*** 227,231 **** --- 57,65 ---- os::yield_all(tries); // Yield to threads of any priority } else if (tries > 5) { os::yield(); // Yield to threads of same or higher priority } } + + void OSThread::SR_handler(Thread* thread, ucontext_t* uc) { + os::Solaris::SR_handler(thread, uc); + }