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Last site update Jan 14 2014


semphr. h
xSemaphoreGetMutexHolder( SemaphoreHandle_t xMutex );

Return the handle of the task that holds the mutex specified by the function parameter, if any.

xSemaphoreGetMutexHolder() can be used reliably to determine if the calling task is the mutex holder, but cannot be used reliably if the mutex is held by any task other than the calling task. This is because the mutex holder might change between the calling task calling the function, and the calling task testing the functionís return value.

configUSE_MUTEXES must be set to 1 in FreeRTOSConfig.h for xSemaphoreGetMutexHolder() to be available.

xMutex The handle of the mutex being queried.
The handle of the task that holds the mutex specified by the xMutex parameter. NULL is returned if the semaphore passed in the xMutex parameter is not a mutex type semaphore, or if the mutex is available and so not held by any task.

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