esp-idf/components/freertos/esp_additions/include/freertos/task_snapshot.h

/*
 * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#pragma once

#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

#ifdef __cplusplus
extern "C" {
#endif

#if CONFIG_FREERTOS_ENABLE_TASK_SNAPSHOT || defined __DOXYGEN__
/**
 * @brief Task Snapshot structure
 *
 * - Used with the uxTaskGetSnapshotAll() function to save memory snapshot of each task in the system.
 * - We need this structure because TCB_t is defined (hidden) in tasks.c.
 */
typedef struct xTASK_SNAPSHOT
{
    void        *pxTCB;         /*!< Address of the task control block. */
    StackType_t *pxTopOfStack;  /*!< Points to the location of the last item placed on the tasks stack. */
    StackType_t *pxEndOfStack;  /*!< Points to the end of the stack. pxTopOfStack < pxEndOfStack, stack grows hi2lo
                                    pxTopOfStack > pxEndOfStack, stack grows lo2hi*/
} TaskSnapshot_t;

/**
 * @brief Iterate over all tasks in the system
 *
 * - This function can be used to iterate over every task in the system
 * - The first call to this function must set pxTask to NULL
 * - When all functions have been iterated, this function will return NULL.
 * - This function is only available when CONFIG_FREERTOS_ENABLE_TASK_SNAPSHOT is set to 1.
 *
 * @note This function should only be called when FreeRTOS is no longer running (e.g., during a panic) as this function
 * 		 does not acquire any locks.
 * @param pxTask Handle of the previous task (or NULL on the first call of this function)
 * @return TaskHandle_t Handle of the next task (or NULL when all tasks have been iterated over)
 */
TaskHandle_t pxTaskGetNext( TaskHandle_t pxTask );

/**
 * @brief Fill a TaskSnapshot_t structure for specified task.
 *
 * - This function is used by the panic handler to get the snapshot of a particular task.
 * - This function is only available when CONFIG_FREERTOS_ENABLE_TASK_SNAPSHOT is set to 1.
 *
 * @note This function should only be called when FreeRTOS is no longer running (e.g., during a panic) as this function
 * 		 does not acquire any locks.
 * @param[in] pxTask Task's handle
 * @param[out] pxTaskSnapshot Snapshot of the task
 */
void vTaskGetSnapshot( TaskHandle_t pxTask, TaskSnapshot_t *pxTaskSnapshot );

/**
 * @brief Fill an array of TaskSnapshot_t structures for every task in the system
 *
 * - This function is used by the panic handler to get a snapshot of all tasks in the system
 * - This function is only available when CONFIG_FREERTOS_ENABLE_TASK_SNAPSHOT is set to 1.
 *
 * @note This function should only be called when FreeRTOS is no longer running (e.g., during a panic) as this function
 * 		 does not acquire any locks.
 * @param[out] pxTaskSnapshotArray Array of TaskSnapshot_t structures filled by this function
 * @param[in] uxArrayLength Length of the provided array
 * @param[out] pxTCBSize Size of the a task's TCB structure
 * @return UBaseType_t
 */
UBaseType_t uxTaskGetSnapshotAll( TaskSnapshot_t * const pxTaskSnapshotArray, const UBaseType_t uxArrayLength, UBaseType_t * const pxTCBSize );

#endif // CONFIG_FREERTOS_ENABLE_TASK_SNAPSHOT || defined __DOXYGEN__

#ifdef __cplusplus
}
#endif