library/threading.c (mbedTLS)

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/* * Threading abstraction layer * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * 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 <unistd.h> #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 */