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6 Janvier 2021
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Each task maintains its own stack. If a task is created using xTaskCreate() then the memory used as the task's stack is allocated automatically from the FreeRTOS heap, and dimensioned by a parameter passed to the xTaskCreate() API function. If a task is created using xTaskCreateStatic() then the memory used as the task's stack is pre-allocated by the application writer. Stack overflow is a very common cause of application instability. FreeRTOS therefore provides two optional mechanisms that can be used to assist in the detection and correction of just such an occurrence. The option used is configured using the configCHECK_FOR_STACK_OVERFLOW configuration constant.
Note that these options are only available on architectures where the memory map is not segmented. Also, some processors could generate a fault or exception in response to a stack corruption before the RTOS kernel overflow check can occur. The application must provide a stack overflow hook function if configCHECK_FOR_STACK_OVERFLOW is not set to 0. The hook function must be called vApplicationStackOverflowHook(), and have the prototype below:
The xTask and pcTaskName parameters pass to the hook function the handle and name of the offending task respectively. Note however, depending on the severity of the overflow, these parameters could themselves be corrupted, in which case the pxCurrentTCB variable can be inspected directly.
Stack overflow checking introduces a context switch overhead so its use is only recommended during the development or testing phases. Adobe premiere pro change language mac.
This method is quick but not guaranteed to catch all stack overflows. Set configCHECK_FOR_STACK_OVERFLOW to 1 to use this method.
This method is less efficient than method one, but still fairly fast. It is very likely to catch stack overflows but is still not guaranteed to catch all overflows. Sublime text 3 1 1.
