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   1 /**
   2  * \file threading.h
   3  *
   4  * \brief Threading abstraction layer
   5  */
   6 /*
   7  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   8  *  SPDX-License-Identifier: GPL-2.0
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  *
  24  *  This file is part of mbed TLS (https://tls.mbed.org)
  25  */
  26 #ifndef MBEDTLS_THREADING_H
  27 #define MBEDTLS_THREADING_H
  28
  29 #if !defined(MBEDTLS_CONFIG_FILE)
  30 #include "config.h"
  31 #else
  32 #include MBEDTLS_CONFIG_FILE
  33 #endif
  34
  35 #include <stdlib.h>
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 #define MBEDTLS_ERR_THREADING_FEATURE_UNAVAILABLE         -0x001A  /**< The selected feature is not available. */
  42 #define MBEDTLS_ERR_THREADING_BAD_INPUT_DATA              -0x001C  /**< Bad input parameters to function. */
  43 #define MBEDTLS_ERR_THREADING_MUTEX_ERROR                 -0x001E  /**< Locking / unlocking / free failed with error code. */
  44
  45 #if defined(MBEDTLS_THREADING_PTHREAD)
  46 #include <pthread.h>
  47 typedef struct mbedtls_threading_mutex_t
  48 {
  49     pthread_mutex_t mutex;
  50     char is_valid;
  51 } mbedtls_threading_mutex_t;
  52 #endif
  53
  54 #if defined(MBEDTLS_THREADING_ALT)
  55 /* You should define the mbedtls_threading_mutex_t type in your header */
  56 #include "threading_alt.h"
  57
  58 /**
  59  * \brief           Set your alternate threading implementation function
  60  *                  pointers and initialize global mutexes. If used, this
  61  *                  function must be called once in the main thread before any
  62  *                  other mbed TLS function is called, and
  63  *                  mbedtls_threading_free_alt() must be called once in the main
  64  *                  thread after all other mbed TLS functions.
  65  *
  66  * \note            mutex_init() and mutex_free() don't return a status code.
  67  *                  If mutex_init() fails, it should leave its argument (the
  68  *                  mutex) in a state such that mutex_lock() will fail when
  69  *                  called with this argument.
  70  *
  71  * \param mutex_init    the init function implementation
  72  * \param mutex_free    the free function implementation
  73  * \param mutex_lock    the lock function implementation
  74  * \param mutex_unlock  the unlock function implementation
  75  */
  76 void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
  77                        void (*mutex_free)( mbedtls_threading_mutex_t * ),
  78                        int (*mutex_lock)( mbedtls_threading_mutex_t * ),
  79                        int (*mutex_unlock)( mbedtls_threading_mutex_t * ) );
  80
  81 /**
  82  * \brief               Free global mutexes.
  83  */
  84 void mbedtls_threading_free_alt( void );
  85 #endif /* MBEDTLS_THREADING_ALT */
  86
  87 #if defined(MBEDTLS_THREADING_C)
  88 /*
  89  * The function pointers for mutex_init, mutex_free, mutex_ and mutex_unlock
  90  *
  91  * All these functions are expected to work or the result will be undefined.
  92  */
  93 extern void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t *mutex );
  94 extern void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t *mutex );
  95 extern int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t *mutex );
  96 extern int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t *mutex );
  97
  98 /*
  99  * Global mutexes
 100  */
 101 #if defined(MBEDTLS_FS_IO)
 102 extern mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex;
 103 #endif
 104 #endif /* MBEDTLS_THREADING_C */
 105
 106 #ifdef __cplusplus
 107 }
 108 #endif
 109
 110 #endif /* threading.h */