/*

 * 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 <https://www.gnu.org/licenses/>

 *

 */

#ifndef GNUTLS_LIB_LOCKS_H

#define GNUTLS_LIB_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:

 * https://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 /* GNUTLS_LIB_LOCKS_H */