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/**
* \file threading.h
*
* \brief Threading abstraction layer
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#ifndef MBEDTLS_THREADING_H
#define MBEDTLS_THREADING_H
#include "mbedtls/private_access.h"
#include "mbedtls/build_info.h"
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
/** Bad input parameters to function. */
#define MBEDTLS_ERR_THREADING_BAD_INPUT_DATA -0x001C
/** Locking / unlocking / free failed with error code. */
#define MBEDTLS_ERR_THREADING_MUTEX_ERROR -0x001E
#if defined(MBEDTLS_THREADING_PTHREAD)
#include <pthread.h>
typedef struct mbedtls_threading_mutex_t {
pthread_mutex_t MBEDTLS_PRIVATE(mutex);
/* is_valid is 0 after a failed init or a free, and nonzero after a
* successful init. This field is not considered part of the public
* API of Mbed TLS and may change without notice. */
char MBEDTLS_PRIVATE(is_valid);
} mbedtls_threading_mutex_t;
#endif
#if defined(MBEDTLS_THREADING_ALT)
/* You should define the mbedtls_threading_mutex_t type in your header */
#include "threading_alt.h"
/**
* \brief Set your alternate threading implementation function
* pointers and initialize global mutexes. If used, this
* function must be called once in the main thread before any
* other Mbed TLS function is called, and
* mbedtls_threading_free_alt() must be called once in the main
* thread after all other Mbed TLS functions.
*
* \note mutex_init() and mutex_free() don't return a status code.
* If mutex_init() fails, it should leave its argument (the
* mutex) in a state such that mutex_lock() will fail when
* called with this argument.
*
* \param mutex_init the init function implementation
* \param mutex_free the free function implementation
* \param mutex_lock the lock function implementation
* \param mutex_unlock the unlock function implementation
*/
void mbedtls_threading_set_alt(void (*mutex_init)(mbedtls_threading_mutex_t *),
void (*mutex_free)(mbedtls_threading_mutex_t *),
int (*mutex_lock)(mbedtls_threading_mutex_t *),
int (*mutex_unlock)(mbedtls_threading_mutex_t *));
/**
* \brief Free global mutexes.
*/
void mbedtls_threading_free_alt(void);
#endif /* MBEDTLS_THREADING_ALT */
#if defined(MBEDTLS_THREADING_C)
/*
* The function pointers for mutex_init, mutex_free, mutex_ and mutex_unlock
*
* All these functions are expected to work or the result will be undefined.
*/
extern void (*mbedtls_mutex_init)(mbedtls_threading_mutex_t *mutex);
extern void (*mbedtls_mutex_free)(mbedtls_threading_mutex_t *mutex);
extern int (*mbedtls_mutex_lock)(mbedtls_threading_mutex_t *mutex);
extern int (*mbedtls_mutex_unlock)(mbedtls_threading_mutex_t *mutex);
/*
* Global mutexes
*/
#if defined(MBEDTLS_FS_IO)
extern mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex;
#endif
#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
/* This mutex may or may not be used in the default definition of
* mbedtls_platform_gmtime_r(), but in order to determine that,
* we need to check POSIX features, hence modify _POSIX_C_SOURCE.
* With the current approach, this declaration is orphaned, lacking
* an accompanying definition, in case mbedtls_platform_gmtime_r()
* doesn't need it, but that's not a problem. */
extern mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex;
#endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
#endif /* MBEDTLS_THREADING_C */
#ifdef __cplusplus
}
#endif
#endif /* threading.h */
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