Implementation of semaphore in Queues in freeRtos

Question

Is queues in freeRtos from the beginning also mutual exclusive, by that i mean, shall i create some kind of mutual exclusion for writing or reading from a queue, or is it already implemented by the function xQueueRead and xQueueSend.

Answer 1

If you look at the source in "queue.c" you will notice that xQueueGenericSend() and xQueueGenericReceive() functions are using tastENTER_CRITICAL()/taskEXIT_CRITICAL() macro pair to ensure atomic operation of the function, which, in a sense, is kind of mutual exclusion you are asking for.