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/*
* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/AutomaticThread.h>
#include <wtf/Deque.h>
#include <wtf/Function.h>
#include <wtf/NumberOfCores.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>
namespace WTF {
class WorkerPool : public ThreadSafeRefCounted<WorkerPool> {
public:
WTF_EXPORT_PRIVATE void postTask(Function<void()>&&);
WTF_EXPORT_PRIVATE ~WorkerPool();
// If timeout is infinity, it means AutomaticThread will be never automatically destroyed.
static Ref<WorkerPool> create(ASCIILiteral name, unsigned numberOfWorkers = WTF::numberOfProcessorCores(), Seconds timeout = Seconds::infinity())
{
ASSERT(numberOfWorkers >= 1);
return adoptRef(*new WorkerPool(name, numberOfWorkers, timeout));
}
ASCIILiteral name() const { return m_name; }
WTF_EXPORT_PRIVATE unsigned numberOfTasks() const;
private:
class Worker;
friend class Worker;
WTF_EXPORT_PRIVATE WorkerPool(ASCIILiteral name, unsigned numberOfWorkers, Seconds timeout);
bool shouldSleep(const AbstractLocker&);
Box<Lock> m_lock;
const Ref<AutomaticThreadCondition> m_condition;
Seconds m_timeout;
MonotonicTime m_lastTimeoutTime { MonotonicTime::nan() };
unsigned m_numberOfActiveWorkers { 0 };
Vector<Ref<Worker>> m_workers;
Deque<Function<void()>> m_tasks;
ASCIILiteral m_name;
};
}
using WTF::WorkerPool;
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