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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ZMQ_MUTEX_HPP_INCLUDED__
#define __ZMQ_MUTEX_HPP_INCLUDED__
#include "platform.hpp"
#include "err.hpp"
// Mutex class encapsulates OS mutex in a platform-independent way.
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
namespace zmq
{
class mutex_t
{
public:
inline mutex_t ()
{
InitializeCriticalSection (&cs);
}
inline ~mutex_t ()
{
DeleteCriticalSection (&cs);
}
inline void lock ()
{
EnterCriticalSection (&cs);
}
inline bool try_lock ()
{
return (TryEnterCriticalSection (&cs)) ? true : false;
}
inline void unlock ()
{
LeaveCriticalSection (&cs);
}
private:
CRITICAL_SECTION cs;
// Disable copy construction and assignment.
mutex_t (const mutex_t&);
void operator = (const mutex_t&);
};
}
#else
#include <pthread.h>
namespace zmq
{
class mutex_t
{
public:
inline mutex_t ()
{
int rc = pthread_mutex_init (&mutex, NULL);
posix_assert (rc);
}
inline ~mutex_t ()
{
int rc = pthread_mutex_destroy (&mutex);
posix_assert (rc);
}
inline void lock ()
{
int rc = pthread_mutex_lock (&mutex);
posix_assert (rc);
}
inline bool try_lock ()
{
int rc = pthread_mutex_trylock (&mutex);
if (rc == EBUSY)
return false;
posix_assert (rc);
return true;
}
inline void unlock ()
{
int rc = pthread_mutex_unlock (&mutex);
posix_assert (rc);
}
private:
pthread_mutex_t mutex;
// Disable copy construction and assignment.
mutex_t (const mutex_t&);
const mutex_t &operator = (const mutex_t&);
};
}
#endif
namespace zmq
{
struct scoped_lock_t
{
scoped_lock_t (mutex_t& mutex_)
: mutex (mutex_)
{
mutex.lock ();
}
~scoped_lock_t ()
{
mutex.unlock ();
}
private:
mutex_t& mutex;
// Disable copy construction and assignment.
scoped_lock_t (const scoped_lock_t&);
const scoped_lock_t &operator = (const scoped_lock_t&);
};
}
#endif
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