- Account for number of pending tasks in old-space collections.

runtime/vm/lockers.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_LOCKERS_H_
 #define VM_LOCKERS_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/globals.h"
 #include "vm/isolate.h"
 #include "vm/thread.h"
 
 namespace dart {
 
-class MutexLocker : public StackResource {
+class MutexLocker : public ValueObject {
  public:
-  explicit MutexLocker(Mutex* mutex) :
-    StackResource(Isolate::Current()),
-    mutex_(mutex) {
+  explicit MutexLocker(Mutex* mutex) : mutex_(mutex) {
     ASSERT(mutex != NULL);
     // TODO(iposva): Consider adding a no GC scope here.
     mutex_->Lock();
   }
 
   virtual ~MutexLocker() {
     mutex_->Unlock();
     // TODO(iposva): Consider decrementing the no GC scope here.
   }
 
  private:
   Mutex* const mutex_;
 
   DISALLOW_COPY_AND_ASSIGN(MutexLocker);
 };
 
 
-class MonitorLocker : public StackResource {
+class MonitorLocker : public ValueObject {
  public:
-  explicit MonitorLocker(Monitor* monitor)
-      : StackResource(Isolate::Current()),
-        monitor_(monitor) {
+  explicit MonitorLocker(Monitor* monitor) : monitor_(monitor) {
     ASSERT(monitor != NULL);
     // TODO(iposva): Consider adding a no GC scope here.
     monitor_->Enter();
   }
 
   virtual ~MonitorLocker() {
     monitor_->Exit();
     // TODO(iposva): Consider decrementing the no GC scope here.
   }
 
@@ skipping 16 matching lines @@
  private:
   Monitor* const monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(MonitorLocker);
 };
 
 }  // namespace dart
 
 
 #endif  // VM_LOCKERS_H_