esp-idf/components/aws_iot/port/threads_freertos.c

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/*
* Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Additions Copyright 2016 Espressif Systems (Shanghai) PTE LTD
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "threads_platform.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Initialize the provided mutex
*
* Call this function to initialize the mutex
*
* @param IoT_Mutex_t - pointer to the mutex to be initialized
* @return IoT_Error_t - error code indicating result of operation
*/
IoT_Error_t aws_iot_thread_mutex_init(IoT_Mutex_t *pMutex) {
pMutex->mutex = xSemaphoreCreateRecursiveMutex();
return pMutex->mutex ? SUCCESS : MUTEX_INIT_ERROR;
}
/**
* @brief Lock the provided mutex
*
* Call this function to lock the mutex before performing a state change
* Blocking, thread will block until lock request fails
*
* @param IoT_Mutex_t - pointer to the mutex to be locked
* @return IoT_Error_t - error code indicating result of operation
*/
IoT_Error_t aws_iot_thread_mutex_lock(IoT_Mutex_t *pMutex) {
xSemaphoreTakeRecursive(pMutex->mutex, portMAX_DELAY);
return SUCCESS;
}
/**
* @brief Try to lock the provided mutex
*
* Call this function to attempt to lock the mutex before performing a state change
* Non-Blocking, immediately returns with failure if lock attempt fails
*
* @param IoT_Mutex_t - pointer to the mutex to be locked
* @return IoT_Error_t - error code indicating result of operation
*/
IoT_Error_t aws_iot_thread_mutex_trylock(IoT_Mutex_t *pMutex) {
if (xSemaphoreTakeRecursive(pMutex->mutex, 0)) {
return SUCCESS;
} else {
return MUTEX_LOCK_ERROR;
}
}
/**
* @brief Unlock the provided mutex
*
* Call this function to unlock the mutex before performing a state change
*
* @param IoT_Mutex_t - pointer to the mutex to be unlocked
* @return IoT_Error_t - error code indicating result of operation
*/
IoT_Error_t aws_iot_thread_mutex_unlock(IoT_Mutex_t *pMutex) {
if (xSemaphoreGiveRecursive(pMutex->mutex)) {
return SUCCESS;
} else {
return MUTEX_UNLOCK_ERROR;
}
}
/**
* @brief Destroy the provided mutex
*
* Call this function to destroy the mutex
*
* @param IoT_Mutex_t - pointer to the mutex to be destroyed
* @return IoT_Error_t - error code indicating result of operation
*/
IoT_Error_t aws_iot_thread_mutex_destroy(IoT_Mutex_t *pMutex) {
vSemaphoreDelete(pMutex->mutex);
return SUCCESS;
}
#ifdef __cplusplus
}
#endif