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/*
* Copyright (C) 2010-2013 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
* Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
*
* 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __pbd_semutils_h__
#define __pbd_semutils_h__
#if (defined PLATFORM_WINDOWS && !defined USE_PTW32_SEMAPHORE)
#define WINDOWS_SEMAPHORE 1
#endif
#ifdef WINDOWS_SEMAPHORE
#include <windows.h>
#else
#include <pthread.h>
#include <semaphore.h>
#endif
#include "pbd/libpbd_visibility.h"
namespace PBD {
class LIBPBD_API Semaphore {
private:
#ifdef WINDOWS_SEMAPHORE
HANDLE _sem;
#elif __APPLE__
sem_t* _sem;
sem_t* ptr_to_sem() const { return _sem; }
#else
mutable sem_t _sem;
sem_t* ptr_to_sem() const { return &_sem; }
#endif
public:
Semaphore (const char* name, int val);
~Semaphore ();
#ifdef WINDOWS_SEMAPHORE
int signal ();
int wait ();
int reset ();
#else
int signal () { return sem_post (ptr_to_sem()); }
int wait () { return sem_wait (ptr_to_sem()); }
int reset () { int rv = 0 ; while (sem_trywait (ptr_to_sem()) == 0) ++rv; return rv; }
#endif
};
}
#endif /* __pbd_semutils_h__ */
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