TaskScheduler [2/9] Scheduler Lock

base/task_scheduler/scheduler_lock_impl.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_TASK_SCHEDULER_SCHEDULER_LOCK_IMPL_H
+#define BASE_TASK_SCHEDULER_SCHEDULER_LOCK_IMPL_H
+
+#include "base/base_export.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+
+namespace base {
+
+class ConditionVariable;
+
+namespace internal {
+
+// A regular lock with simple deadlock correctness checking.
+// This lock tracks all of the available locks to make sure that any locks are
+// acquired in an expected order. It serves as the primary lock in the scheduler
+// when DCHECK_IS_ON() via inheritance by SchedulerLock.
+class BASE_EXPORT SchedulerLockImpl {
+ public:
+  SchedulerLockImpl();
+  explicit SchedulerLockImpl(const SchedulerLockImpl* predecessor);
+  ~SchedulerLockImpl();
+
+  void Acquire();
+  void Release();
+
+  scoped_ptr<ConditionVariable> CreateConditionVariable();
+
+ private:
+  Lock lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(SchedulerLockImpl);
+};
+
+}  // namespace internal
+}  // namespace base
+
+#endif  // BASE_TASK_SCHEDULER_SCHEDULER_LOCK_IMPL_H