ThreadPool.h

/*
╔══════════════════════════════════════════════════════════════════════════════╗
║                       SIMPLY POWERFUL TOOLKIT (SPTK)                         ║
╟──────────────────────────────────────────────────────────────────────────────╢
║  copyright            © 1999-2022 Alexey Parshin. All rights reserved.       ║
║  email                alexeyp@gmail.com                                      ║
╚══════════════════════════════════════════════════════════════════════════════╝
┌──────────────────────────────────────────────────────────────────────────────┐
│   This library is free software; you can redistribute it and/or modify it    │
│   under the terms of the GNU Library General Public License as published by  │
│   the Free Software Foundation; either version 2 of the License, or (at your │
│   option) any later version.                                                 │
│                                                                              │
│   This library 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 Library   │
│   General Public License for more details.                                   │
│                                                                              │
│   You should have received a copy of the GNU Library General Public License  │
│   along with this library; if not, write to the Free Software Foundation,    │
│   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.               │
│                                                                              │
│   Please report all bugs and problems to alexeyp@gmail.com.                  │
└──────────────────────────────────────────────────────────────────────────────┘
*/
 
#pragma once
 
#include <sptk5/LogEngine.h>
#include <sptk5/threads/Runable.h>
#include <sptk5/threads/SynchronizedList.h>
#include <sptk5/threads/SynchronizedQueue.h>
#include <sptk5/threads/ThreadEvent.h>
#include <sptk5/threads/ThreadManager.h>
#include <sptk5/threads/WorkerThread.h>
 
namespace sptk {
 
class SP_EXPORT ThreadPool
    : public ThreadEvent
    , public std::mutex
{
public:
    ThreadPool(uint32_t threadLimit, std::chrono::milliseconds threadIdleSeconds, const String& threadName,
               LogEngine* logEngine);
 
    virtual void execute(const SRunable& task);
 
    void threadEvent(Thread* thread, ThreadEvent::Type eventType, SRunable runable) override;
 
    virtual void stop();
 
    size_t size() const;
 
private:
    SThreadManager m_threadManager;             
    size_t m_threadLimit;                       
    SynchronizedQueue<SRunable> m_taskQueue;    
    Semaphore m_availableThreads;               
    std::chrono::milliseconds m_threadIdleTime; 
    SLogger m_logger;                           
 
    std::atomic_bool m_shutdown {false}; 
 
    WorkerThread* createThread();
 
    void logThreadEvent(const String& event, const Thread* workerThread) const;
};
 
} // namespace sptk