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/*
* Copyright (C) 2010-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS 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 2.1 of
* the License, or (at your option) any later version.
*
* This library 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 GNUTLS_LOCKS_H
#define GNUTLS_LOCKS_H
#include <gnutls/gnutls.h>
#include "gnutls_int.h"
#include <system.h>
#ifdef HAVE_STDATOMIC_H
# include <stdatomic.h>
#endif
extern mutex_init_func gnutls_mutex_init;
extern mutex_deinit_func gnutls_mutex_deinit;
extern mutex_lock_func gnutls_mutex_lock;
extern mutex_unlock_func gnutls_mutex_unlock;
#if defined(HAVE_WIN32_LOCKS)
# include <windows.h>
/* Idea based based on comment 2 at:
* http://stackoverflow.com/questions/3555859/is-it-possible-to-do-static-initialization-of-mutexes-in-windows
*/
# define GNUTLS_STATIC_MUTEX(mutex) \
static CRITICAL_SECTION *mutex = NULL
# define GNUTLS_STATIC_MUTEX_LOCK(mutex) \
if (mutex == NULL) { \
CRITICAL_SECTION *mutex##tmp = malloc(sizeof(CRITICAL_SECTION)); \
InitializeCriticalSection(mutex##tmp); \
if (InterlockedCompareExchangePointer((PVOID*)&mutex, (PVOID)mutex##tmp, NULL) != NULL) { \
DeleteCriticalSection(mutex##tmp); \
free(mutex##tmp); \
} \
} \
EnterCriticalSection(mutex)
# define GNUTLS_STATIC_MUTEX_UNLOCK(mutex) \
LeaveCriticalSection(mutex)
#elif defined(HAVE_PTHREAD_LOCKS)
# include <pthread.h>
# define GNUTLS_STATIC_MUTEX(mutex) \
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER
# define GNUTLS_STATIC_MUTEX_LOCK(mutex) \
pthread_mutex_lock(&mutex)
# define GNUTLS_STATIC_MUTEX_UNLOCK(mutex) \
pthread_mutex_unlock(&mutex)
#else
# define GNUTLS_STATIC_MUTEX(mutex)
# define GNUTLS_STATIC_MUTEX_LOCK(mutex)
# define GNUTLS_STATIC_MUTEX_UNLOCK(mutex)
#endif
#endif
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