Exemplo n.º 1
0
bool VM_GC_Operation::doit_prologue() {
  assert(Thread::current()->is_Java_thread(), "just checking");
  assert(((_gc_cause != GCCause::_no_gc) &&
          (_gc_cause != GCCause::_no_cause_specified)), "Illegal GCCause");

  // To be able to handle a GC the VM initialization needs to be completed.
  if (!is_init_completed()) {
    vm_exit_during_initialization(
      err_msg("GC triggered before VM initialization completed. Try increasing "
              "NewSize, current value " UINTX_FORMAT "%s.",
              byte_size_in_proper_unit(NewSize),
              proper_unit_for_byte_size(NewSize)));
  }

  acquire_pending_list_lock();
  // If the GC count has changed someone beat us to the collection
  // Get the Heap_lock after the pending_list_lock.
  Heap_lock->lock();

  // Check invocations
  if (skip_operation()) {
    // skip collection
    Heap_lock->unlock();
    release_and_notify_pending_list_lock();
    _prologue_succeeded = false;
  } else {
    _prologue_succeeded = true;
    SharedHeap* sh = SharedHeap::heap();
    if (sh != NULL) sh->_thread_holds_heap_lock_for_gc = true;
  }
  return _prologue_succeeded;
}
Exemplo n.º 2
0
void ConcurrentMarkSweepThread::run() {
  assert(this == cmst(), "just checking");

  this->record_stack_base_and_size();
  this->initialize_thread_local_storage();
  this->set_active_handles(JNIHandleBlock::allocate_block());
  // From this time Thread::current() should be working.
  assert(this == Thread::current(), "just checking");
  if (BindCMSThreadToCPU && !os::bind_to_processor(CPUForCMSThread)) {
    warning("Couldn't bind CMS thread to processor %u", CPUForCMSThread);
  }
  // Wait until Universe::is_fully_initialized()
  {
    CMSLoopCountWarn loopX("CMS::run", "waiting for "
                           "Universe::is_fully_initialized()", 2);
    MutexLockerEx x(CGC_lock, true);
    set_CMS_flag(CMS_cms_wants_token);
    // Wait until Universe is initialized and all initialization is completed.
    while (!is_init_completed() && !Universe::is_fully_initialized() &&
           !_should_terminate) {
      CGC_lock->wait(true, 200);
      loopX.tick();
    }
    // Wait until the surrogate locker thread that will do
    // pending list locking on our behalf has been created.
    // We cannot start the SLT thread ourselves since we need
    // to be a JavaThread to do so.
    CMSLoopCountWarn loopY("CMS::run", "waiting for SLT installation", 2);
    while (_slt == NULL && !_should_terminate) {
      CGC_lock->wait(true, 200);
      loopY.tick();
    }
    clear_CMS_flag(CMS_cms_wants_token);
  }

  while (!_should_terminate) {
    sleepBeforeNextCycle();
    if (_should_terminate) break;
    GCCause::Cause cause = _collector->_full_gc_requested ?
      _collector->_full_gc_cause : GCCause::_cms_concurrent_mark;
    _collector->collect_in_background(false, cause);
  }
  assert(_should_terminate, "just checking");
  // Check that the state of any protocol for synchronization
  // between background (CMS) and foreground collector is "clean"
  // (i.e. will not potentially block the foreground collector,
  // requiring action by us).
  verify_ok_to_terminate();
  // Signal that it is terminated
  {
    MutexLockerEx mu(Terminator_lock,
                     Mutex::_no_safepoint_check_flag);
    assert(_cmst == this, "Weird!");
    _cmst = NULL;
    Terminator_lock->notify();
  }

  // Thread destructor usually does this..
  ThreadLocalStorage::set_thread(NULL);
}
Exemplo n.º 3
0
ExceptionMark::~ExceptionMark() {
    if (_thread->has_pending_exception()) {
        Handle exception(_thread, _thread->pending_exception());
        _thread->clear_pending_exception(); // Needed to avoid infinite recursion
        if (is_init_completed()) {
            exception->print();
            fatal("ExceptionMark destructor expects no pending exceptions");
        } else {
            vm_exit_during_initialization(exception);
        }
    }
}
Exemplo n.º 4
0
void InterfaceSupport::zombieAll() {
  // This method is called by all threads when a thread make
  // transition to VM state (for example, runtime calls).
  // Divide number of calls by number of threads to avoid
  // dependence of ZombieAll events frequency on number of threads.
  int value = zombieAllCounter / Threads::number_of_threads();
  if (is_init_completed() && value > ZombieALotInterval) {
    zombieAllCounter = 0;
    VM_ZombieAll op;
    VMThread::execute(&op);
  }
  zombieAllCounter++;
}
Exemplo n.º 5
0
void pd_obfuscate_location(char *buf,int buflen) {
  const char *tag = NULL;

#ifndef PRODUCT
  if( is_init_completed() ) {
    if(os::Solaris::mutator_libthread()) {
      tag = " [ Patched ]";
    } else {
      tag = " [ Unpatched ]";
    }
  } else {
    tag = " [ Unknown ]";
  }
#else

  // State info
  // 0x00 = unpatched
  // 0x01 = patched
  // 0xFF = unknown

  if( is_init_completed() ) {
    if(os::Solaris::mutator_libthread()) {
      tag = " 01";
    } else {
      tag = " 00";
    }
  } else {
    tag = " FF";
  }  
#endif

  if(strlen(buf) + strlen(tag) + 1 < buflen) {
    strcat(buf,tag);
  }

}
Exemplo n.º 6
0
void vm_perform_shutdown_actions() {
  // Warning: do not call 'exit_globals()' here. All threads are still running.
  // Calling 'exit_globals()' will disable thread-local-storage and cause all
  // kinds of assertions to trigger in debug mode.
  if (is_init_completed()) {
    Thread* thread = Thread::current();
    if (thread->is_Java_thread()) {
      // We are leaving the VM, set state to native (in case any OS exit
      // handlers call back to the VM)
      JavaThread* jt = (JavaThread*)thread;
      // Must always be walkable or have no last_Java_frame when in
      // thread_in_native
      jt->frame_anchor()->make_walkable(jt);
      jt->set_thread_state(_thread_in_native);
    }
  }
  notify_vm_shutdown();
}
Exemplo n.º 7
0
void InterfaceSupport::deoptimizeAll() {
  // This method is called by all threads when a thread make
  // transition to VM state (for example, runtime calls).
  // Divide number of calls by number of threads to avoid
  // dependence of DeoptimizeAll events frequency on number of threads.
  int value = deoptimizeAllCounter / Threads::number_of_threads();
  if (is_init_completed()) {
    if (DeoptimizeALot && value > DeoptimizeALotInterval) {
      deoptimizeAllCounter = 0;
      VM_DeoptimizeAll op;
      VMThread::execute(&op);
    } else if (DeoptimizeRandom && (value & 0x1F) == (os::random() & 0x1F)) {
      VM_DeoptimizeAll op;
      VMThread::execute(&op);
    }
  }
  deoptimizeAllCounter++;
}
Exemplo n.º 8
0
void vm_perform_shutdown_actions() {
  // Warning: do not call 'exit_globals()' here. All threads are still running.
  // Calling 'exit_globals()' will disable thread-local-storage and cause all
  // kinds of assertions to trigger in debug mode.
  if (is_init_completed()) {
    Thread* thread = Thread::current();
    if (thread->is_Java_thread()) {
      JavaThread *jt = (JavaThread*)thread;
if(jt->jvm_locked_by_self()){
        // We are leaving the VM, unlock the JVM lock like we would if we were
        // running in native code.  (in case any OS exit handlers call back to
        // the VM)
jt->jvm_unlock_self();
      }
    }
  }
  notify_vm_shutdown();
}
Exemplo n.º 9
0
void InterfaceSupport::stress_derived_pointers() {
#ifdef COMPILER2
  JavaThread *thread = JavaThread::current();
  if (!is_init_completed()) return;
  ResourceMark rm(thread);
  bool found = false;
  for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
    CodeBlob* cb = sfs.current()->cb();
    if (cb != NULL && cb->oop_maps() ) {
      // Find oopmap for current method
      const ImmutableOopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
      assert(map != NULL, "no oopmap found for pc");
      found = map->has_derived_pointer();
    }
  }
  if (found) {
    // $$$ Not sure what to do here.
    /*
    Scavenge::invoke(0);
    */
  }
#endif
}
Exemplo n.º 10
0
void ConcurrentGCThread::wait_for_universe_init() {
  MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
  while (!is_init_completed() && !_should_terminate) {
    CGC_lock->wait(Mutex::_no_safepoint_check_flag, 200);
  }
}