219 lines
7.2 KiB
C
219 lines
7.2 KiB
C
/*
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* Threading abstraction layer
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*
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* This file is provided under the Apache License 2.0, or the
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* GNU General Public License v2.0 or later.
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*
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* **********
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* Apache License 2.0:
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* **********
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*
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* **********
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* GNU General Public License v2.0 or later:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* **********
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*/
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/*
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* Ensure gmtime_r is available even with -std=c99; must be defined before
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* config.h, which pulls in glibc's features.h. Harmless on other platforms.
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*/
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#if !defined(_POSIX_C_SOURCE)
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#define _POSIX_C_SOURCE 200112L
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#endif
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_THREADING_C)
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#include "mbedtls/threading.h"
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#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
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#if !defined(_WIN32) && (defined(unix) || \
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defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
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defined(__MACH__)))
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#include <unistd.h>
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#endif /* !_WIN32 && (unix || __unix || __unix__ ||
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* (__APPLE__ && __MACH__)) */
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#if !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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_POSIX_THREAD_SAFE_FUNCTIONS >= 200112L ) )
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/*
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* This is a convenience shorthand macro to avoid checking the long
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* preprocessor conditions above. Ideally, we could expose this macro in
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* platform_util.h and simply use it in platform_util.c, threading.c and
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* threading.h. However, this macro is not part of the Mbed TLS public API, so
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* we keep it private by only defining it in this file
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*/
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#if ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) )
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#define THREADING_USE_GMTIME
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#endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */
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#endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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_POSIX_THREAD_SAFE_FUNCTIONS >= 200112L ) ) */
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#endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
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#if defined(MBEDTLS_THREADING_PTHREAD)
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static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )
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{
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if( mutex == NULL )
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return;
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/* A nonzero value of is_valid indicates a successfully initialized
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* mutex. This is a workaround for not being able to return an error
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* code for this function. The lock/unlock functions return an error
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* if is_valid is nonzero. The Mbed TLS unit test code uses this field
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* to distinguish more states of the mutex; see helpers.function for
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* details. */
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mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;
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}
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static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )
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{
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if( mutex == NULL || !mutex->is_valid )
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return;
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(void) pthread_mutex_destroy( &mutex->mutex );
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mutex->is_valid = 0;
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}
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static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )
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{
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if( mutex == NULL || ! mutex->is_valid )
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return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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if( pthread_mutex_lock( &mutex->mutex ) != 0 )
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return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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return( 0 );
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}
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static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )
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{
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if( mutex == NULL || ! mutex->is_valid )
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return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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if( pthread_mutex_unlock( &mutex->mutex ) != 0 )
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return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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return( 0 );
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}
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void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;
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void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;
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int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;
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int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;
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/*
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* With phtreads we can statically initialize mutexes
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*/
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#define MUTEX_INIT = { PTHREAD_MUTEX_INITIALIZER, 1 }
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#endif /* MBEDTLS_THREADING_PTHREAD */
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#if defined(MBEDTLS_THREADING_ALT)
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static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )
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{
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((void) mutex );
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return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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}
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static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )
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{
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((void) mutex );
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return;
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}
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void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
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void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
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int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
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int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
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/*
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* Set functions pointers and initialize global mutexes
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*/
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void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
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void (*mutex_free)( mbedtls_threading_mutex_t * ),
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int (*mutex_lock)( mbedtls_threading_mutex_t * ),
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int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )
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{
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mbedtls_mutex_init = mutex_init;
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mbedtls_mutex_free = mutex_free;
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mbedtls_mutex_lock = mutex_lock;
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mbedtls_mutex_unlock = mutex_unlock;
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#if defined(MBEDTLS_FS_IO)
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mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
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#endif
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#if defined(THREADING_USE_GMTIME)
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mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
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#endif
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}
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/*
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* Free global mutexes
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*/
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void mbedtls_threading_free_alt( void )
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{
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#if defined(MBEDTLS_FS_IO)
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mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
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#endif
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#if defined(THREADING_USE_GMTIME)
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mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
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#endif
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}
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#endif /* MBEDTLS_THREADING_ALT */
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/*
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* Define global mutexes
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*/
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#ifndef MUTEX_INIT
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#define MUTEX_INIT
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#endif
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#if defined(MBEDTLS_FS_IO)
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mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
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#endif
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#if defined(THREADING_USE_GMTIME)
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mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
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#endif
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#endif /* MBEDTLS_THREADING_C */
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