Implementation of SequencedTaskRunner based on SequencedWorkerPool.

base/threading/sequenced_task_runner_impl.h

+// Copyright (c) 2012 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_THREADING_SEQUENCED_TASK_RUNNER_IMPL_H_
+#define BASE_THREADING_SEQUENCED_TASK_RUNNER_IMPL_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner.h"
+#include "base/threading/sequenced_worker_pool.h"
+
+namespace base {
+
+// Note that this class is RefCountedThreadSafe (inherited from TaskRunner).
+class BASE_EXPORT SequencedTaskRunnerImpl
+    : public base::SequencedTaskRunner,
+      public base::SupportsWeakPtr<SequencedTaskRunnerImpl> {

[akalin, 2012/03/15 19:17:35]

It doesn't make sense for a ref-counted-thread-safe object to support weak
pointers, as weak pointers are non-thread-safe.

+ public:
+  explicit SequencedTaskRunnerImpl(scoped_refptr<SequencedWorkerPool> pool);
+
+  SequencedTaskRunnerImpl(scoped_refptr<SequencedWorkerPool> pool,

[akalin, 2012/03/15 19:17:35]

just one constructor, for pool + token

[Francois, 2012/03/18 16:28:29]

Done.

+                          SequencedWorkerPool::SequenceToken token);
+
+  SequencedTaskRunnerImpl(scoped_refptr<SequencedWorkerPool> pool,
+                          const std::string& token_name);
+
+  // TaskRunner implementation
+  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
+                               const Closure& task,
+                               int64 delay_ms) OVERRIDE;
+  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
+                               const Closure& task,
+                               TimeDelta delay) OVERRIDE;
+  virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
+
+  // SequencedTaskRunner implementation
+  virtual bool PostNonNestableDelayedTask(
+      const tracked_objects::Location& from_here,
+      const Closure& task,
+      int64 delay_ms) OVERRIDE;
+  virtual bool PostNonNestableDelayedTask(
+      const tracked_objects::Location& from_here,
+      const Closure& task,
+      base::TimeDelta delay) OVERRIDE;
+
+ private:
+  ~SequencedTaskRunnerImpl();
+
+  scoped_refptr<SequencedWorkerPool> pool_;
+
+  SequencedWorkerPool::SequenceToken token_;
+
+  DISALLOW_COPY_AND_ASSIGN(SequencedTaskRunnerImpl);
+};
+
+}  // namespace base
+
+#endif  // BASE_THREADING_SEQUENCED_TASK_RUNNER_IMPL_H_