4 * \brief Threading abstraction layer
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7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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8 * SPDX-License-Identifier: Apache-2.0
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10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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11 * not use this file except in compliance with the License.
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12 * You may obtain a copy of the License at
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14 * http://www.apache.org/licenses/LICENSE-2.0
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16 * Unless required by applicable law or agreed to in writing, software
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17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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19 * See the License for the specific language governing permissions and
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20 * limitations under the License.
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22 * This file is part of mbed TLS (https://tls.mbed.org)
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24 #ifndef MBEDTLS_THREADING_H
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25 #define MBEDTLS_THREADING_H
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27 #if !defined(MBEDTLS_CONFIG_FILE)
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30 #include MBEDTLS_CONFIG_FILE
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39 /* MBEDTLS_ERR_THREADING_FEATURE_UNAVAILABLE is deprecated and should not be
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41 #define MBEDTLS_ERR_THREADING_FEATURE_UNAVAILABLE -0x001A /**< The selected feature is not available. */
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43 #define MBEDTLS_ERR_THREADING_BAD_INPUT_DATA -0x001C /**< Bad input parameters to function. */
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44 #define MBEDTLS_ERR_THREADING_MUTEX_ERROR -0x001E /**< Locking / unlocking / free failed with error code. */
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46 #if defined(MBEDTLS_THREADING_PTHREAD)
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47 #include <pthread.h>
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48 typedef struct mbedtls_threading_mutex_t
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50 pthread_mutex_t mutex;
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52 } mbedtls_threading_mutex_t;
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55 #if defined(MBEDTLS_THREADING_ALT)
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56 /* You should define the mbedtls_threading_mutex_t type in your header */
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57 #include "threading_alt.h"
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60 * \brief Set your alternate threading implementation function
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61 * pointers and initialize global mutexes. If used, this
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62 * function must be called once in the main thread before any
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63 * other mbed TLS function is called, and
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64 * mbedtls_threading_free_alt() must be called once in the main
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65 * thread after all other mbed TLS functions.
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67 * \note mutex_init() and mutex_free() don't return a status code.
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68 * If mutex_init() fails, it should leave its argument (the
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69 * mutex) in a state such that mutex_lock() will fail when
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70 * called with this argument.
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72 * \param mutex_init the init function implementation
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73 * \param mutex_free the free function implementation
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74 * \param mutex_lock the lock function implementation
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75 * \param mutex_unlock the unlock function implementation
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77 void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
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78 void (*mutex_free)( mbedtls_threading_mutex_t * ),
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79 int (*mutex_lock)( mbedtls_threading_mutex_t * ),
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80 int (*mutex_unlock)( mbedtls_threading_mutex_t * ) );
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83 * \brief Free global mutexes.
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85 void mbedtls_threading_free_alt( void );
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86 #endif /* MBEDTLS_THREADING_ALT */
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88 #if defined(MBEDTLS_THREADING_C)
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90 * The function pointers for mutex_init, mutex_free, mutex_ and mutex_unlock
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92 * All these functions are expected to work or the result will be undefined.
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94 extern void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t *mutex );
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95 extern void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t *mutex );
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96 extern int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t *mutex );
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97 extern int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t *mutex );
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102 #if defined(MBEDTLS_FS_IO)
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103 extern mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex;
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106 #if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
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107 /* This mutex may or may not be used in the default definition of
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108 * mbedtls_platform_gmtime_r(), but in order to determine that,
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109 * we need to check POSIX features, hence modify _POSIX_C_SOURCE.
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110 * With the current approach, this declaration is orphaned, lacking
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111 * an accompanying definition, in case mbedtls_platform_gmtime_r()
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112 * doesn't need it, but that's not a problem. */
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113 extern mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex;
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114 #endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
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116 #endif /* MBEDTLS_THREADING_C */
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122 #endif /* threading.h */
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