118 lines
4.3 KiB
C
118 lines
4.3 KiB
C
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/**
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* \file threading.h
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*
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* \brief Threading abstraction layer
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_THREADING_H
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#define MBEDTLS_THREADING_H
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#include "mbedtls/private_access.h"
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#include "mbedtls/build_info.h"
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Bad input parameters to function. */
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#define MBEDTLS_ERR_THREADING_BAD_INPUT_DATA -0x001C
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/** Locking / unlocking / free failed with error code. */
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#define MBEDTLS_ERR_THREADING_MUTEX_ERROR -0x001E
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#if defined(MBEDTLS_THREADING_PTHREAD)
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#include <pthread.h>
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typedef struct mbedtls_threading_mutex_t {
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pthread_mutex_t MBEDTLS_PRIVATE(mutex);
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/* is_valid is 0 after a failed init or a free, and nonzero after a
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* successful init. This field is not considered part of the public
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* API of Mbed TLS and may change without notice. */
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char MBEDTLS_PRIVATE(is_valid);
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} mbedtls_threading_mutex_t;
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#endif
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#if defined(MBEDTLS_THREADING_ALT)
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/* You should define the mbedtls_threading_mutex_t type in your header */
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#include "threading_alt.h"
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/**
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* \brief Set your alternate threading implementation function
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* pointers and initialize global mutexes. If used, this
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* function must be called once in the main thread before any
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* other mbed TLS function is called, and
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* mbedtls_threading_free_alt() must be called once in the main
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* thread after all other mbed TLS functions.
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*
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* \note mutex_init() and mutex_free() don't return a status code.
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* If mutex_init() fails, it should leave its argument (the
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* mutex) in a state such that mutex_lock() will fail when
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* called with this argument.
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*
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* \param mutex_init the init function implementation
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* \param mutex_free the free function implementation
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* \param mutex_lock the lock function implementation
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* \param mutex_unlock the unlock function implementation
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*/
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void mbedtls_threading_set_alt(void (*mutex_init)(mbedtls_threading_mutex_t *),
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void (*mutex_free)(mbedtls_threading_mutex_t *),
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int (*mutex_lock)(mbedtls_threading_mutex_t *),
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int (*mutex_unlock)(mbedtls_threading_mutex_t *));
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/**
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* \brief Free global mutexes.
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*/
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void mbedtls_threading_free_alt(void);
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#endif /* MBEDTLS_THREADING_ALT */
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#if defined(MBEDTLS_THREADING_C)
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/*
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* The function pointers for mutex_init, mutex_free, mutex_ and mutex_unlock
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*
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* All these functions are expected to work or the result will be undefined.
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*/
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extern void (*mbedtls_mutex_init)(mbedtls_threading_mutex_t *mutex);
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extern void (*mbedtls_mutex_free)(mbedtls_threading_mutex_t *mutex);
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extern int (*mbedtls_mutex_lock)(mbedtls_threading_mutex_t *mutex);
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extern int (*mbedtls_mutex_unlock)(mbedtls_threading_mutex_t *mutex);
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/*
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* Global mutexes
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*/
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#if defined(MBEDTLS_FS_IO)
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extern mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex;
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#endif
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#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
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/* This mutex may or may not be used in the default definition of
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* mbedtls_platform_gmtime_r(), but in order to determine that,
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* we need to check POSIX features, hence modify _POSIX_C_SOURCE.
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* With the current approach, this declaration is orphaned, lacking
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* an accompanying definition, in case mbedtls_platform_gmtime_r()
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* doesn't need it, but that's not a problem. */
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extern mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex;
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#endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
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#endif /* MBEDTLS_THREADING_C */
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#ifdef __cplusplus
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}
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#endif
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#endif /* threading.h */
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