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/* Part of SWI-Prolog

Author: Jan Wielemaker

E-mail: J.Wielemaker@vu.nl

WWW: http://www.swi-prolog.org

Copyright (c) 2011-2013, University of Amsterdam

VU University Amsterdam

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

1. Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in

the documentation and/or other materials provided with the

distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,

BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

*/

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

To allow for multiple thread-implementations, we do not use plain POSIX

mutex-primitives in the remainder of the code. Instead, mutexes are

controlled using the following macros:

type simpleMutex Non-recursive mutex

simpleMutexInit(p) Initialise a simple mutex

simpleMutexDelete(p) Delete a simple mutex

simpleMutexLock(p) Lock a simple mutex

simpleMutexTryLock(p) Try Lock a simple mutex

simpleMutexUnlock(p) unlock a simple mutex

This file is a modified copy of SWI-Prolog's pl-mutex.h, providing only

the simple mutexes.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

#ifndef MUTEX_H_DEFINED

#define MUTEX_H_DEFINED

#if defined(__WINDOWS__)

#define USE_CRITICAL_SECTIONS 1

#endif

#ifdef USE_CRITICAL_SECTIONS

#ifndef WINDOWS_LEAN_AND_MEAN

#define WINDOWS_LEAN_AND_MEAN

#endif

#include <winsock2.h>

#include <windows.h>

#define simpleMutex CRITICAL_SECTION

#define simpleMutexInit(p) InitializeCriticalSection(p)

#define simpleMutexDelete(p) DeleteCriticalSection(p)

#define simpleMutexLock(p) EnterCriticalSection(p)

#define simpleMutexUnlock(p) LeaveCriticalSection(p)

#else /* USE_CRITICAL_SECTIONS */

#include <pthread.h>

typedef pthread_mutex_t simpleMutex;

#define simpleMutexInit(p) pthread_mutex_init(p, NULL)

#define simpleMutexDelete(p) pthread_mutex_destroy(p)

#define simpleMutexLock(p) pthread_mutex_lock(p)

#define simpleMutexUnlock(p) pthread_mutex_unlock(p)

#endif /*USE_CRITICAL_SECTIONS*/

#endif /*MUTEX_H_DEFINED*/