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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef ZT_BINARYSEMAPHORE_HPP
#define ZT_BINARYSEMAPHORE_HPP
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "Constants.hpp"
#include "NonCopyable.hpp"
#ifdef __WINDOWS__
#include <Windows.h>
namespace ZeroTier {
class BinarySemaphore : NonCopyable
{
public:
BinarySemaphore() throw() { _sem = CreateSemaphore(NULL,0,1,NULL); }
~BinarySemaphore() { CloseHandle(_sem); }
inline void wait() { WaitForSingleObject(_sem,INFINITE); }
inline void post() { ReleaseSemaphore(_sem,1,NULL); }
private:
HANDLE _sem;
};
} // namespace ZeroTier
#else // !__WINDOWS__
#include <pthread.h>
namespace ZeroTier {
class BinarySemaphore : NonCopyable
{
public:
BinarySemaphore()
{
pthread_mutex_init(&_mh,(const pthread_mutexattr_t *)0);
pthread_cond_init(&_cond,(const pthread_condattr_t *)0);
_f = false;
}
~BinarySemaphore()
{
pthread_cond_destroy(&_cond);
pthread_mutex_destroy(&_mh);
}
inline void wait()
{
pthread_mutex_lock(const_cast <pthread_mutex_t *>(&_mh));
while (!_f)
pthread_cond_wait(const_cast <pthread_cond_t *>(&_cond),const_cast <pthread_mutex_t *>(&_mh));
_f = false;
pthread_mutex_unlock(const_cast <pthread_mutex_t *>(&_mh));
}
inline void post()
{
pthread_mutex_lock(const_cast <pthread_mutex_t *>(&_mh));
_f = true;
pthread_mutex_unlock(const_cast <pthread_mutex_t *>(&_mh));
pthread_cond_signal(const_cast <pthread_cond_t *>(&_cond));
}
private:
pthread_cond_t _cond;
pthread_mutex_t _mh;
volatile bool _f;
};
} // namespace ZeroTier
#endif // !__WINDOWS__
#endif
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