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/* Copyright 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <cstddef>
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/stdx/functional.h"
#include "mongo/util/concurrency/thread_pool.h"
namespace mongo {
/**
* Implementation of a fixed-size pool of threads that can perform scheduled
* tasks.
*
* Deprecated. Use ThreadPool from thread_pool.h, instead.
*/
class OldThreadPool {
MONGO_DISALLOW_COPYING(OldThreadPool);
public:
typedef stdx::function<void()> Task; // nullary function or functor
struct DoNotStartThreadsTag {};
explicit OldThreadPool(int nThreads = 8, const std::string& threadNamePrefix = "");
explicit OldThreadPool(const DoNotStartThreadsTag&,
int nThreads = 8,
const std::string& threadNamePrefix = "");
std::size_t getNumThreads() const;
ThreadPool::Stats getStats() const;
// Launches the worker threads; call exactly once, if and only if
// you used the DoNotStartThreadsTag form of the constructor.
void startThreads();
// blocks until all tasks are complete (tasks_remaining() == 0)
// does not prevent new tasks from being scheduled so could wait forever.
// Also, new tasks could be scheduled after this returns.
void join();
// task will be copied a few times so make sure it's relatively cheap
void schedule(Task task);
private:
ThreadPool _pool;
};
} // namespace mongo
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