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/*

 *  Threading abstraction layer

 *

 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved

 *  SPDX-License-Identifier: GPL-2.0

 *

 *  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 2 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, write to the Free Software Foundation, Inc.,

 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 *  This file is part of mbed TLS (https://tls.mbed.org)

 */

/*

 * Ensure gmtime_r is available even with -std=c99; must be defined before

 * config.h, which pulls in glibc's features.h. Harmless on other platforms.

 */

#if !defined(_POSIX_C_SOURCE)

#define _POSIX_C_SOURCE 200112L

#endif

#if !defined(MBEDTLS_CONFIG_FILE)

#include "mbedtls/config.h"

#else

#include MBEDTLS_CONFIG_FILE

#endif

#if defined(MBEDTLS_THREADING_C)

#include "mbedtls/threading.h"

#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)

#if !defined(_WIN32) && (defined(unix) || \

    defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \

    defined(__MACH__)))

#include 

#endif /* !_WIN32 && (unix || __unix || __unix__ ||

        * (__APPLE__ && __MACH__)) */

#if !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) ||     \

       ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) &&                     \

         _POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) )

/*

 * This is a convenience shorthand macro to avoid checking the long

 * preprocessor conditions above. Ideally, we could expose this macro in

 * platform_util.h and simply use it in platform_util.c, threading.c and

 * threading.h. However, this macro is not part of the Mbed TLS public API, so

 * we keep it private by only defining it in this file

 */

#if ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) )

#define THREADING_USE_GMTIME

#endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */

#endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) ||     \

             ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) &&                     \

                _POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) ) */

#endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */

#if defined(MBEDTLS_THREADING_PTHREAD)

static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )

{

    if( mutex == NULL )

        return;

    mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;

}

static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )

{

    if( mutex == NULL || !mutex->is_valid )

        return;

    (void) pthread_mutex_destroy( &mutex->mutex );

    mutex->is_valid = 0;

}

static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )

{

    if( mutex == NULL || ! mutex->is_valid )

        return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );

    if( pthread_mutex_lock( &mutex->mutex ) != 0 )

        return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );

    return( 0 );

}

static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )

{

    if( mutex == NULL || ! mutex->is_valid )

        return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );

    if( pthread_mutex_unlock( &mutex->mutex ) != 0 )

        return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );

    return( 0 );

}

void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;

void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;

int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;

int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;

/*

 * With phtreads we can statically initialize mutexes

 */

#define MUTEX_INIT  = { PTHREAD_MUTEX_INITIALIZER, 1 }

#endif /* MBEDTLS_THREADING_PTHREAD */

#if defined(MBEDTLS_THREADING_ALT)

static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )

{

    ((void) mutex );

    return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );

}

static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )

{

    ((void) mutex );

    return;

}

void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;

void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;

int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;

int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;

/*

 * Set functions pointers and initialize global mutexes

 */

void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),

                       void (*mutex_free)( mbedtls_threading_mutex_t * ),

                       int (*mutex_lock)( mbedtls_threading_mutex_t * ),

                       int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )

{

    mbedtls_mutex_init = mutex_init;

    mbedtls_mutex_free = mutex_free;

    mbedtls_mutex_lock = mutex_lock;

    mbedtls_mutex_unlock = mutex_unlock;

#if defined(MBEDTLS_FS_IO)

    mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );

#endif

#if defined(THREADING_USE_GMTIME)

    mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );

#endif

}

/*

 * Free global mutexes

 */

void mbedtls_threading_free_alt( void )

{

#if defined(MBEDTLS_FS_IO)

    mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );

#endif

#if defined(THREADING_USE_GMTIME)

    mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );

#endif

}

#endif /* MBEDTLS_THREADING_ALT */

/*

 * Define global mutexes

 */

#ifndef MUTEX_INIT

#define MUTEX_INIT

#endif

#if defined(MBEDTLS_FS_IO)

mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;

#endif

#if defined(THREADING_USE_GMTIME)

mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;

#endif

#endif /* MBEDTLS_THREADING_C */