--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/vm_operations.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,450 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_vm_operations.cpp.incl"
+
+#define VM_OP_NAME_INITIALIZE(name) #name,
+
+const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
+ { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
+
+void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
+ _calling_thread = thread;
+ assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
+ _priority = priority;
+}
+
+
+void VM_Operation::evaluate() {
+ ResourceMark rm;
+ if (TraceVMOperation) {
+ tty->print("[");
+ NOT_PRODUCT(print();)
+ }
+ doit();
+ if (TraceVMOperation) {
+ tty->print_cr("]");
+ }
+}
+
+// Called by fatal error handler.
+void VM_Operation::print_on_error(outputStream* st) const {
+ st->print("VM_Operation (" PTR_FORMAT "): ", this);
+ st->print("%s", name());
+
+ const char* mode;
+ switch(evaluation_mode()) {
+ case _safepoint : mode = "safepoint"; break;
+ case _no_safepoint : mode = "no safepoint"; break;
+ case _concurrent : mode = "concurrent"; break;
+ case _async_safepoint: mode = "async safepoint"; break;
+ default : mode = "unknown"; break;
+ }
+ st->print(", mode: %s", mode);
+
+ if (calling_thread()) {
+ st->print(", requested by thread " PTR_FORMAT, calling_thread());
+ }
+}
+
+void VM_ThreadStop::doit() {
+ assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
+ JavaThread* target = java_lang_Thread::thread(target_thread());
+ // Note that this now allows multiple ThreadDeath exceptions to be
+ // thrown at a thread.
+ if (target != NULL) {
+ // the thread has run and is not already in the process of exiting
+ target->send_thread_stop(throwable());
+ }
+}
+
+void VM_Deoptimize::doit() {
+ // We do not want any GCs to happen while we are in the middle of this VM operation
+ ResourceMark rm;
+ DeoptimizationMarker dm;
+
+ // Deoptimize all activations depending on marked nmethods
+ Deoptimization::deoptimize_dependents();
+
+ // Make the dependent methods zombies
+ CodeCache::make_marked_nmethods_zombies();
+}
+
+
+VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) {
+ _thread = thread;
+ _id = id;
+}
+
+
+void VM_DeoptimizeFrame::doit() {
+ Deoptimization::deoptimize_frame(_thread, _id);
+}
+
+
+#ifndef PRODUCT
+
+void VM_DeoptimizeAll::doit() {
+ DeoptimizationMarker dm;
+ // deoptimize all java threads in the system
+ if (DeoptimizeALot) {
+ for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
+ if (thread->has_last_Java_frame()) {
+ thread->deoptimize();
+ }
+ }
+ } else if (DeoptimizeRandom) {
+
+ // Deoptimize some selected threads and frames
+ int tnum = os::random() & 0x3;
+ int fnum = os::random() & 0x3;
+ int tcount = 0;
+ for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
+ if (thread->has_last_Java_frame()) {
+ if (tcount++ == tnum) {
+ tcount = 0;
+ int fcount = 0;
+ // Deoptimize some selected frames.
+ // Biased llocking wants a updated register map
+ for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
+ if (fst.current()->can_be_deoptimized()) {
+ if (fcount++ == fnum) {
+ fcount = 0;
+ Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+}
+
+
+void VM_ZombieAll::doit() {
+ JavaThread *thread = (JavaThread *)calling_thread();
+ assert(thread->is_Java_thread(), "must be a Java thread");
+ thread->make_zombies();
+}
+
+#endif // !PRODUCT
+
+void VM_Verify::doit() {
+ Universe::verify();
+}
+
+bool VM_PrintThreads::doit_prologue() {
+ assert(Thread::current()->is_Java_thread(), "just checking");
+
+ // Make sure AbstractOwnableSynchronizer is loaded
+ if (JDK_Version::is_gte_jdk16x_version()) {
+ java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
+ }
+
+ // Get Heap_lock if concurrent locks will be dumped
+ if (_print_concurrent_locks) {
+ Heap_lock->lock();
+ }
+ return true;
+}
+
+void VM_PrintThreads::doit() {
+ Threads::print_on(_out, true, false, _print_concurrent_locks);
+}
+
+void VM_PrintThreads::doit_epilogue() {
+ if (_print_concurrent_locks) {
+ // Release Heap_lock
+ Heap_lock->unlock();
+ }
+}
+
+void VM_PrintJNI::doit() {
+ JNIHandles::print_on(_out);
+}
+
+VM_FindDeadlocks::~VM_FindDeadlocks() {
+ if (_deadlocks != NULL) {
+ DeadlockCycle* cycle = _deadlocks;
+ while (cycle != NULL) {
+ DeadlockCycle* d = cycle;
+ cycle = cycle->next();
+ delete d;
+ }
+ }
+}
+
+bool VM_FindDeadlocks::doit_prologue() {
+ assert(Thread::current()->is_Java_thread(), "just checking");
+
+ // Load AbstractOwnableSynchronizer class
+ if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) {
+ java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
+ }
+
+ return true;
+}
+
+void VM_FindDeadlocks::doit() {
+ _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks);
+ if (_out != NULL) {
+ int num_deadlocks = 0;
+ for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
+ num_deadlocks++;
+ cycle->print_on(_out);
+ }
+
+ if (num_deadlocks == 1) {
+ _out->print_cr("\nFound 1 deadlock.\n");
+ _out->flush();
+ } else if (num_deadlocks > 1) {
+ _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
+ _out->flush();
+ }
+ }
+}
+
+VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
+ int max_depth,
+ bool with_locked_monitors,
+ bool with_locked_synchronizers) {
+ _result = result;
+ _num_threads = 0; // 0 indicates all threads
+ _threads = NULL;
+ _result = result;
+ _max_depth = max_depth;
+ _with_locked_monitors = with_locked_monitors;
+ _with_locked_synchronizers = with_locked_synchronizers;
+}
+
+VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
+ GrowableArray<instanceHandle>* threads,
+ int num_threads,
+ int max_depth,
+ bool with_locked_monitors,
+ bool with_locked_synchronizers) {
+ _result = result;
+ _num_threads = num_threads;
+ _threads = threads;
+ _result = result;
+ _max_depth = max_depth;
+ _with_locked_monitors = with_locked_monitors;
+ _with_locked_synchronizers = with_locked_synchronizers;
+}
+
+bool VM_ThreadDump::doit_prologue() {
+ assert(Thread::current()->is_Java_thread(), "just checking");
+
+ // Load AbstractOwnableSynchronizer class before taking thread snapshots
+ if (JDK_Version::is_gte_jdk16x_version()) {
+ java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
+ }
+
+ if (_with_locked_synchronizers) {
+ // Acquire Heap_lock to dump concurrent locks
+ Heap_lock->lock();
+ }
+
+ return true;
+}
+
+void VM_ThreadDump::doit_epilogue() {
+ if (_with_locked_synchronizers) {
+ // Release Heap_lock
+ Heap_lock->unlock();
+ }
+}
+
+void VM_ThreadDump::doit() {
+ ResourceMark rm;
+
+ ConcurrentLocksDump concurrent_locks(true);
+ if (_with_locked_synchronizers) {
+ concurrent_locks.dump_at_safepoint();
+ }
+
+ if (_num_threads == 0) {
+ // Snapshot all live threads
+ for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
+ if (jt->is_exiting() ||
+ jt->is_hidden_from_external_view()) {
+ // skip terminating threads and hidden threads
+ continue;
+ }
+ ThreadConcurrentLocks* tcl = NULL;
+ if (_with_locked_synchronizers) {
+ tcl = concurrent_locks.thread_concurrent_locks(jt);
+ }
+ ThreadSnapshot* ts = snapshot_thread(jt, tcl);
+ _result->add_thread_snapshot(ts);
+ }
+ } else {
+ // Snapshot threads in the given _threads array
+ // A dummy snapshot is created if a thread doesn't exist
+ for (int i = 0; i < _num_threads; i++) {
+ instanceHandle th = _threads->at(i);
+ if (th() == NULL) {
+ // skip if the thread doesn't exist
+ // Add a dummy snapshot
+ _result->add_thread_snapshot(new ThreadSnapshot());
+ continue;
+ }
+
+ // Dump thread stack only if the thread is alive and not exiting
+ // and not VM internal thread.
+ JavaThread* jt = java_lang_Thread::thread(th());
+ if (jt == NULL || /* thread not alive */
+ jt->is_exiting() ||
+ jt->is_hidden_from_external_view()) {
+ // add a NULL snapshot if skipped
+ _result->add_thread_snapshot(new ThreadSnapshot());
+ continue;
+ }
+ ThreadConcurrentLocks* tcl = NULL;
+ if (_with_locked_synchronizers) {
+ tcl = concurrent_locks.thread_concurrent_locks(jt);
+ }
+ ThreadSnapshot* ts = snapshot_thread(jt, tcl);
+ _result->add_thread_snapshot(ts);
+ }
+ }
+}
+
+ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
+ ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread);
+ snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
+ snapshot->set_concurrent_locks(tcl);
+ return snapshot;
+}
+
+volatile bool VM_Exit::_vm_exited = false;
+Thread * VM_Exit::_shutdown_thread = NULL;
+
+int VM_Exit::set_vm_exited() {
+ Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
+
+ assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
+
+ int num_active = 0;
+
+ _shutdown_thread = thr_cur;
+ _vm_exited = true; // global flag
+ for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next())
+ if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
+ ++num_active;
+ thr->set_terminated(JavaThread::_vm_exited); // per-thread flag
+ }
+
+ return num_active;
+}
+
+int VM_Exit::wait_for_threads_in_native_to_block() {
+ // VM exits at safepoint. This function must be called at the final safepoint
+ // to wait for threads in _thread_in_native state to be quiescent.
+ assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
+
+ Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
+ Monitor timer(Mutex::leaf, "VM_Exit timer", true);
+
+ // Compiler threads need longer wait because they can access VM data directly
+ // while in native. If they are active and some structures being used are
+ // deleted by the shutdown sequence, they will crash. On the other hand, user
+ // threads must go through native=>Java/VM transitions first to access VM
+ // data, and they will be stopped during state transition. In theory, we
+ // don't have to wait for user threads to be quiescent, but it's always
+ // better to terminate VM when current thread is the only active thread, so
+ // wait for user threads too. Numbers are in 10 milliseconds.
+ int max_wait_user_thread = 30; // at least 300 milliseconds
+ int max_wait_compiler_thread = 1000; // at least 10 seconds
+
+ int max_wait = max_wait_compiler_thread;
+
+ int attempts = 0;
+ while (true) {
+ int num_active = 0;
+ int num_active_compiler_thread = 0;
+
+ for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) {
+ if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
+ num_active++;
+ if (thr->is_Compiler_thread()) {
+ num_active_compiler_thread++;
+ }
+ }
+ }
+
+ if (num_active == 0) {
+ return 0;
+ } else if (attempts > max_wait) {
+ return num_active;
+ } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
+ return num_active;
+ }
+
+ attempts++;
+
+ MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
+ timer.wait(Mutex::_no_safepoint_check_flag, 10);
+ }
+}
+
+void VM_Exit::doit() {
+ CompileBroker::set_should_block();
+
+ // Wait for a short period for threads in native to block. Any thread
+ // still executing native code after the wait will be stopped at
+ // native==>Java/VM barriers.
+ // Among 16276 JCK tests, 94% of them come here without any threads still
+ // running in native; the other 6% are quiescent within 250ms (Ultra 80).
+ wait_for_threads_in_native_to_block();
+
+ set_vm_exited();
+
+ // cleanup globals resources before exiting. exit_globals() currently
+ // cleans up outputStream resources and PerfMemory resources.
+ exit_globals();
+
+ // Check for exit hook
+ exit_hook_t exit_hook = Arguments::exit_hook();
+ if (exit_hook != NULL) {
+ // exit hook should exit.
+ exit_hook(_exit_code);
+ // ... but if it didn't, we must do it here
+ vm_direct_exit(_exit_code);
+ } else {
+ vm_direct_exit(_exit_code);
+ }
+}
+
+
+void VM_Exit::wait_if_vm_exited() {
+ if (_vm_exited &&
+ ThreadLocalStorage::get_thread_slow() != _shutdown_thread) {
+ // _vm_exited is set at safepoint, and the Threads_lock is never released
+ // we will block here until the process dies
+ Threads_lock->lock_without_safepoint_check();
+ ShouldNotReachHere();
+ }
+}