reactos/dll/3rdparty/mbedtls/threading.c

   1 /*
   2  *  Threading abstraction layer
   3  *
   4  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   5  *  SPDX-License-Identifier: Apache-2.0
   6  *
   7  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
   8  *  not use this file except in compliance with the License.
   9  *  You may obtain a copy of the License at
  10  *
  11  *  http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  15  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  18  *
  19  *  This file is part of mbed TLS (https://tls.mbed.org)
  20  */
  21
  22 #if !defined(MBEDTLS_CONFIG_FILE)
  23 #include "mbedtls/config.h"
  24 #else
  25 #include MBEDTLS_CONFIG_FILE
  26 #endif
  27
  28 #if defined(MBEDTLS_THREADING_C)
  29
  30 #include "mbedtls/threading.h"
  31
  32 #if defined(MBEDTLS_THREADING_PTHREAD)
  33 static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )
  34 {
  35     if( mutex == NULL )
  36         return;
  37
  38     mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;
  39 }
  40
  41 static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )
  42 {
  43     if( mutex == NULL )
  44         return;
  45
  46     (void) pthread_mutex_destroy( &mutex->mutex );
  47 }
  48
  49 static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )
  50 {
  51     if( mutex == NULL || ! mutex->is_valid )
  52         return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
  53
  54     if( pthread_mutex_lock( &mutex->mutex ) != 0 )
  55         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
  56
  57     return( 0 );
  58 }
  59
  60 static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )
  61 {
  62     if( mutex == NULL || ! mutex->is_valid )
  63         return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
  64
  65     if( pthread_mutex_unlock( &mutex->mutex ) != 0 )
  66         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
  67
  68     return( 0 );
  69 }
  70
  71 void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;
  72 void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;
  73 int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;
  74 int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;
  75
  76 /*
  77  * With phtreads we can statically initialize mutexes
  78  */
  79 #define MUTEX_INIT  = { PTHREAD_MUTEX_INITIALIZER, 1 }
  80
  81 #endif /* MBEDTLS_THREADING_PTHREAD */
  82
  83 #if defined(MBEDTLS_THREADING_ALT)
  84 static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )
  85 {
  86     ((void) mutex );
  87     return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
  88 }
  89 static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )
  90 {
  91     ((void) mutex );
  92     return;
  93 }
  94
  95 void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
  96 void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
  97 int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
  98 int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
  99
 100 /*
 101  * Set functions pointers and initialize global mutexes
 102  */
 103 void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
 104                        void (*mutex_free)( mbedtls_threading_mutex_t * ),
 105                        int (*mutex_lock)( mbedtls_threading_mutex_t * ),
 106                        int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )
 107 {
 108     mbedtls_mutex_init = mutex_init;
 109     mbedtls_mutex_free = mutex_free;
 110     mbedtls_mutex_lock = mutex_lock;
 111     mbedtls_mutex_unlock = mutex_unlock;
 112
 113     mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
 114     mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
 115 }
 116
 117 /*
 118  * Free global mutexes
 119  */
 120 void mbedtls_threading_free_alt( void )
 121 {
 122     mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
 123     mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
 124 }
 125 #endif /* MBEDTLS_THREADING_ALT */
 126
 127 /*
 128  * Define global mutexes
 129  */
 130 #ifndef MUTEX_INIT
 131 #define MUTEX_INIT
 132 #endif
 133 mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
 134 mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
 135
 136 #endif /* MBEDTLS_THREADING_C */