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// Copyright (c) 2011 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_WORKER_POOL_H_
#define BASE_THREADING_WORKER_POOL_H_
#pragma once
#include "base/base_api.h"
#include "base/callback.h"
#include "base/tracked.h"
class Task;
namespace base {
// This is a facility that runs tasks that don't require a specific thread or
// a message loop.
//
// WARNING: This shouldn't be used unless absolutely necessary. We don't wait
// for the worker pool threads to finish on shutdown, so the tasks running
// inside the pool must be extremely careful about other objects they access
// (MessageLoops, Singletons, etc). During shutdown these object may no longer
// exist.
class BASE_API WorkerPool {
public:
// This function posts |task| to run on a worker thread. |task_is_slow|
// should be used for tasks that will take a long time to execute. Returns
// false if |task| could not be posted to a worker thread. Regardless of
// return value, ownership of |task| is transferred to the worker pool.
//
// TODO(ajwong): Remove the Task* based overload once we've finishsed the
// Task -> Closure migration.
static bool PostTask(const tracked_objects::Location& from_here,
Task* task, bool task_is_slow);
static bool PostTask(const tracked_objects::Location& from_here,
const base::Closure& task, bool task_is_slow);
};
} // namespace base
#endif // BASE_THREADING_WORKER_POOL_H_
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