LmmsSemaphore.h

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/*
 * Semaphore.h - Semaphore declaration
 *
 * Copyright (c) 2022-2022 Johannes Lorenz <jlsf2013$users.sourceforge.net, $=@>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
/*
 * This code has been copied and adapted from https://github.com/drobilla/jalv
 * File src/zix/sem.h
 */
 
#ifndef LMMS_SEMAPHORE_H
#define LMMS_SEMAPHORE_H
 
#include "lmmsconfig.h"
 
#ifdef LMMS_BUILD_APPLE
#    include <mach/mach.h>
#elif defined(LMMS_BUILD_WIN32)
#    include <windows.h>
#else
#    include <semaphore.h>
#endif
 
 
namespace lmms {

class Semaphore
{
public:
    Semaphore(unsigned initial);
    Semaphore(const Semaphore&) = delete;
    Semaphore& operator=(const Semaphore&) = delete;
    Semaphore(Semaphore&&) = delete;
    Semaphore& operator=(Semaphore&&) = delete;
    ~Semaphore();
 
    void post();
    void wait();
    bool tryWait();
 
private:
#ifdef LMMS_BUILD_APPLE
    semaphore_t m_sem;
#elif defined(LMMS_BUILD_WIN32)
    HANDLE m_sem;
#else
    sem_t m_sem;
#endif
};
 
} // namespace lmms
 
#endif // LMMS_SEMAPHORE_H