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hotspot/src/share/vm/runtime/vm_operations.cpp

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+/*
+ * 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();
+  }
+}