Semaphore.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/DateTime.h>
#include <sptk5/Exception.h>
#include <sptk5/sptk.h>
 
#if CXX_VERSION < 20
#include <condition_variable>
#else
#include <semaphore>
#endif
 
#include <chrono>
 
namespace sptk {
 
class SP_EXPORT Semaphore
{
public:
    void post();
 
    bool sleep_for(std::chrono::milliseconds timeout);
 
    bool sleep_until(DateTime timeout);
 
private:
#if CXX_VERSION < 20
    std::mutex m_lockMutex;
 
    std::condition_variable m_condition;
 
    size_t m_value {0};
#else
    std::counting_semaphore<0x7FFFFFFF> m_value {0};
#endif
};
} // namespace sptk