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// Copyright 2014 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 CONTENT_CHILD_WORKER_THREAD_REGISTRY_H_
#define CONTENT_CHILD_WORKER_THREAD_REGISTRY_H_
#include <map>
#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/threading/platform_thread.h"
#include "content/common/content_export.h"
#include "content/public/child/worker_thread.h"
namespace base {
class TaskRunner;
}
namespace content {
class CONTENT_EXPORT WorkerThreadRegistry {
public:
WorkerThreadRegistry();
int PostTaskToAllThreads(const base::Closure& task);
static WorkerThreadRegistry* Instance();
void DidStartCurrentWorkerThread();
void WillStopCurrentWorkerThread();
// Always returns a non-null task runner regardless of whether the
// corresponding worker thread is gone or not. If the thread is already gone
// the tasks posted onto the task runner will be silently discarded.
base::TaskRunner* GetTaskRunnerFor(int worker_id);
private:
friend class WorkerThread;
friend class WorkerThreadRegistryTest;
bool PostTask(int id, const base::Closure& task);
using IDToTaskRunnerMap = std::map<base::PlatformThreadId, base::TaskRunner*>;
~WorkerThreadRegistry();
// It is possible for an IPC message to arrive for a worker thread that has
// already gone away. In such cases, it is still necessary to provide a
// task-runner for that particular thread, because otherwise the message will
// end up being handled as per usual in the main-thread, causing incorrect
// results. |task_runner_for_dead_worker_| is used to handle such messages,
// which silently discards all the tasks it receives.
scoped_refptr<base::TaskRunner> task_runner_for_dead_worker_;
IDToTaskRunnerMap task_runner_map_;
base::Lock task_runner_map_lock_;
};
} // namespace content
#endif // CONTENT_CHILD_WORKER_THREAD_REGISTRY_H_
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