[398] | 1 | /*
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| 2 | * Threading abstraction layer
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 |
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| 22 | /*
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| 23 | * Ensure gmtime_r is available even with -std=c99; must be defined before
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| 24 | * config.h, which pulls in glibc's features.h. Harmless on other platforms.
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| 25 | */
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| 26 | #if !defined(_POSIX_C_SOURCE)
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| 27 | #define _POSIX_C_SOURCE 200112L
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| 28 | #endif
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| 29 |
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| 30 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 31 | #include "mbedtls/config.h"
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| 32 | #else
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| 33 | #include MBEDTLS_CONFIG_FILE
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| 34 | #endif
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| 35 |
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| 36 | #if defined(MBEDTLS_THREADING_C)
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| 37 |
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| 38 | #include "mbedtls/threading.h"
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| 39 |
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| 40 | #if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
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| 41 |
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| 42 | #if !defined(_WIN32) && (defined(unix) || \
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| 43 | defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
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| 44 | defined(__MACH__)))
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| 45 | #include <unistd.h>
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| 46 | #endif /* !_WIN32 && (unix || __unix || __unix__ ||
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| 47 | * (__APPLE__ && __MACH__)) */
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| 48 |
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| 49 | #if !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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| 50 | ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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| 51 | _POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) )
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| 52 | /*
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| 53 | * This is a convenience shorthand macro to avoid checking the long
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| 54 | * preprocessor conditions above. Ideally, we could expose this macro in
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| 55 | * platform_util.h and simply use it in platform_util.c, threading.c and
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| 56 | * threading.h. However, this macro is not part of the Mbed TLS public API, so
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| 57 | * we keep it private by only defining it in this file
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| 58 | */
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| 59 |
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| 60 | #if ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) )
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| 61 | #define THREADING_USE_GMTIME
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| 62 | #endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */
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| 63 |
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| 64 | #endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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| 65 | ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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| 66 | _POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) ) */
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| 67 |
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| 68 | #endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
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| 69 |
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| 70 | #if defined(MBEDTLS_THREADING_PTHREAD)
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| 71 | static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )
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| 72 | {
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| 73 | if( mutex == NULL )
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| 74 | return;
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| 75 |
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| 76 | mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;
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| 77 | }
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| 78 |
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| 79 | static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )
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| 80 | {
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| 81 | if( mutex == NULL || !mutex->is_valid )
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| 82 | return;
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| 83 |
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| 84 | (void) pthread_mutex_destroy( &mutex->mutex );
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| 85 | mutex->is_valid = 0;
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| 86 | }
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| 87 |
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| 88 | static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )
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| 89 | {
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| 90 | if( mutex == NULL || ! mutex->is_valid )
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| 91 | return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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| 92 |
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| 93 | if( pthread_mutex_lock( &mutex->mutex ) != 0 )
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| 94 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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| 95 |
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| 96 | return( 0 );
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| 97 | }
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| 98 |
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| 99 | static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )
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| 100 | {
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| 101 | if( mutex == NULL || ! mutex->is_valid )
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| 102 | return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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| 103 |
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| 104 | if( pthread_mutex_unlock( &mutex->mutex ) != 0 )
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| 105 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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| 106 |
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| 107 | return( 0 );
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| 108 | }
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| 109 |
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| 110 | void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;
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| 111 | void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;
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| 112 | int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;
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| 113 | int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;
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| 114 |
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| 115 | /*
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| 116 | * With phtreads we can statically initialize mutexes
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| 117 | */
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| 118 | #define MUTEX_INIT = { PTHREAD_MUTEX_INITIALIZER, 1 }
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| 119 |
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| 120 | #endif /* MBEDTLS_THREADING_PTHREAD */
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| 121 |
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| 122 | #if defined(MBEDTLS_THREADING_ALT)
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| 123 | static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )
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| 124 | {
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| 125 | ((void) mutex );
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| 126 | return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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| 127 | }
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| 128 | static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )
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| 129 | {
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| 130 | ((void) mutex );
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| 131 | return;
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| 132 | }
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| 133 |
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| 134 | void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
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| 135 | void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
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| 136 | int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
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| 137 | int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
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| 138 |
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| 139 | /*
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| 140 | * Set functions pointers and initialize global mutexes
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| 141 | */
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| 142 | void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
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| 143 | void (*mutex_free)( mbedtls_threading_mutex_t * ),
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| 144 | int (*mutex_lock)( mbedtls_threading_mutex_t * ),
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| 145 | int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )
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| 146 | {
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| 147 | mbedtls_mutex_init = mutex_init;
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| 148 | mbedtls_mutex_free = mutex_free;
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| 149 | mbedtls_mutex_lock = mutex_lock;
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| 150 | mbedtls_mutex_unlock = mutex_unlock;
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| 151 |
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| 152 | #if defined(MBEDTLS_FS_IO)
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| 153 | mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
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| 154 | #endif
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| 155 | #if defined(THREADING_USE_GMTIME)
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| 156 | mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
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| 157 | #endif
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| 158 | }
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| 159 |
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| 160 | /*
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| 161 | * Free global mutexes
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| 162 | */
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| 163 | void mbedtls_threading_free_alt( void )
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| 164 | {
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| 165 | #if defined(MBEDTLS_FS_IO)
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| 166 | mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
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| 167 | #endif
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| 168 | #if defined(THREADING_USE_GMTIME)
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| 169 | mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
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| 170 | #endif
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| 171 | }
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| 172 | #endif /* MBEDTLS_THREADING_ALT */
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| 173 |
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| 174 | /*
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| 175 | * Define global mutexes
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| 176 | */
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| 177 | #ifndef MUTEX_INIT
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| 178 | #define MUTEX_INIT
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| 179 | #endif
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| 180 | #if defined(MBEDTLS_FS_IO)
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| 181 | mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
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| 182 | #endif
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| 183 | #if defined(THREADING_USE_GMTIME)
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| 184 | mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
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| 185 | #endif
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| 186 |
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| 187 | #endif /* MBEDTLS_THREADING_C */
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