threading.c

00001 /*
00002  *  Threading abstraction layer
00003  *
00004  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
00005  *  SPDX-License-Identifier: Apache-2.0
00006  *
00007  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
00008  *  not use this file except in compliance with the License.
00009  *  You may obtain a copy of the License at
00010  *
00011  *  http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  *  Unless required by applicable law or agreed to in writing, software
00014  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00015  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016  *  See the License for the specific language governing permissions and
00017  *  limitations under the License.
00018  *
00019  *  This file is part of mbed TLS (https://tls.mbed.org)
00020  */
00021 
00022 #if !defined(MBEDTLS_CONFIG_FILE)
00023 #include "mbedtls/config.h"
00024 #else
00025 #include MBEDTLS_CONFIG_FILE
00026 #endif
00027 
00028 #if defined(MBEDTLS_THREADING_C)
00029 
00030 #include "mbedtls/threading.h"
00031 
00032 #if defined(MBEDTLS_THREADING_PTHREAD)
00033 static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )
00034 {
00035     if( mutex == NULL )
00036         return;
00037 
00038     mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;
00039 }
00040 
00041 static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )
00042 {
00043     if( mutex == NULL || !mutex->is_valid )
00044         return;
00045 
00046     (void) pthread_mutex_destroy( &mutex->mutex );
00047     mutex->is_valid = 0;
00048 }
00049 
00050 static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )
00051 {
00052     if( mutex == NULL || ! mutex->is_valid )
00053         return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
00054 
00055     if( pthread_mutex_lock( &mutex->mutex ) != 0 )
00056         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
00057 
00058     return( 0 );
00059 }
00060 
00061 static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )
00062 {
00063     if( mutex == NULL || ! mutex->is_valid )
00064         return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
00065 
00066     if( pthread_mutex_unlock( &mutex->mutex ) != 0 )
00067         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
00068 
00069     return( 0 );
00070 }
00071 
00072 void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;
00073 void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;
00074 int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;
00075 int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;
00076 
00077 /*
00078  * With phtreads we can statically initialize mutexes
00079  */
00080 #define MUTEX_INIT  = { PTHREAD_MUTEX_INITIALIZER, 1 }
00081 
00082 #endif /* MBEDTLS_THREADING_PTHREAD */
00083 
00084 #if defined(MBEDTLS_THREADING_ALT)
00085 static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )
00086 {
00087     ((void) mutex );
00088     return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
00089 }
00090 static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )
00091 {
00092     ((void) mutex );
00093     return;
00094 }
00095 
00096 void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
00097 void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
00098 int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
00099 int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
00100 
00101 /*
00102  * Set functions pointers and initialize global mutexes
00103  */
00104 void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
00105                        void (*mutex_free)( mbedtls_threading_mutex_t * ),
00106                        int (*mutex_lock)( mbedtls_threading_mutex_t * ),
00107                        int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )
00108 {
00109     mbedtls_mutex_init = mutex_init;
00110     mbedtls_mutex_free = mutex_free;
00111     mbedtls_mutex_lock = mutex_lock;
00112     mbedtls_mutex_unlock = mutex_unlock;
00113 
00114     mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
00115     mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
00116 }
00117 
00118 /*
00119  * Free global mutexes
00120  */
00121 void mbedtls_threading_free_alt( void )
00122 {
00123     mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
00124     mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
00125 }
00126 #endif /* MBEDTLS_THREADING_ALT */
00127 
00128 /*
00129  * Define global mutexes
00130  */
00131 #ifndef MUTEX_INIT
00132 #define MUTEX_INIT
00133 #endif
00134 mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
00135 mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
00136 
00137 #endif /* MBEDTLS_THREADING_C */