git.zerfleddert.de Git - proxmark3-svn/blob - common/mbedtls/threading.c

   1 /*
   2  *  Threading abstraction layer
   3  *
   4  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   5  *  SPDX-License-Identifier: GPL-2.0
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *  This file is part of mbed TLS (https://tls.mbed.org)
  22  */
  23
  24 #if !defined(MBEDTLS_CONFIG_FILE)
  25 #include "mbedtls/config.h"
  26 #else
  27 #include MBEDTLS_CONFIG_FILE
  28 #endif
  29
  30 #if defined(MBEDTLS_THREADING_C)
  31
  32 #include "mbedtls/threading.h"
  33
  34 #if defined(MBEDTLS_THREADING_PTHREAD)
  35 static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )
  36 {
  37     if( mutex == NULL )
  38         return;
  39
  40     mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;
  41 }
  42
  43 static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )
  44 {
  45     if( mutex == NULL || !mutex->is_valid )
  46         return;
  47
  48     (void) pthread_mutex_destroy( &mutex->mutex );
  49     mutex->is_valid = 0;
  50 }
  51
  52 static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )
  53 {
  54     if( mutex == NULL || ! mutex->is_valid )
  55         return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
  56
  57     if( pthread_mutex_lock( &mutex->mutex ) != 0 )
  58         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
  59
  60     return( 0 );
  61 }
  62
  63 static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )
  64 {
  65     if( mutex == NULL || ! mutex->is_valid )
  66         return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
  67
  68     if( pthread_mutex_unlock( &mutex->mutex ) != 0 )
  69         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
  70
  71     return( 0 );
  72 }
  73
  74 void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;
  75 void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;
  76 int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;
  77 int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;
  78
  79 /*
  80  * With phtreads we can statically initialize mutexes
  81  */
  82 #define MUTEX_INIT  = { PTHREAD_MUTEX_INITIALIZER, 1 }
  83
  84 #endif /* MBEDTLS_THREADING_PTHREAD */
  85
  86 #if defined(MBEDTLS_THREADING_ALT)
  87 static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )
  88 {
  89     ((void) mutex );
  90     return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
  91 }
  92 static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )
  93 {
  94     ((void) mutex );
  95     return;
  96 }
  97
  98 void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
  99 void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
 100 int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
 101 int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
 102
 103 /*
 104  * Set functions pointers and initialize global mutexes
 105  */
 106 void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
 107                        void (*mutex_free)( mbedtls_threading_mutex_t * ),
 108                        int (*mutex_lock)( mbedtls_threading_mutex_t * ),
 109                        int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )
 110 {
 111     mbedtls_mutex_init = mutex_init;
 112     mbedtls_mutex_free = mutex_free;
 113     mbedtls_mutex_lock = mutex_lock;
 114     mbedtls_mutex_unlock = mutex_unlock;
 115
 116 #if defined(MBEDTLS_FS_IO)
 117     mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
 118 #endif
 119 }
 120
 121 /*
 122  * Free global mutexes
 123  */
 124 void mbedtls_threading_free_alt( void )
 125 {
 126 #if defined(MBEDTLS_FS_IO)
 127     mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
 128 #endif
 129 }
 130 #endif /* MBEDTLS_THREADING_ALT */
 131
 132 /*
 133  * Define global mutexes
 134  */
 135 #ifndef MUTEX_INIT
 136 #define MUTEX_INIT
 137 #endif
 138 #if defined(MBEDTLS_FS_IO)
 139 mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
 140 #endif
 141
 142 #endif /* MBEDTLS_THREADING_C */