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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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Semaphore/Mutex QuestionsPosted by Amr Ali on June 20, 2010 What is the initial value of a binary semaphore after creation? How can I delete a semaphore or a mutex after use? What if by accident I used a deleted semaphore or a mutex? RE: Semaphore/Mutex QuestionsPosted by Dave on June 21, 2010 The code for vSemaphoreCreateBinary() is in semphr.h. It first creates the semaphore, then gives it. Mutexes are also created in a similar way. I think you can use vQueueDelete() to delete a semaphore (they use the same structs) but don't do that if there are any tasks blocked on the semaphore at the time. RE: Semaphore/Mutex QuestionsPosted by Amr Ali on June 21, 2010 Actually deleting a queue while tasks blocked is dangerous as well. What about deleting a mutex? vQueueDelete i think can't be used cause the allocated data is not the same as for a semaphore or a queue. a free function for the structure of the queue plus unregister function would be enough.
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