API change request for xQueueReceive() to drop an entry

[cmcqueen (Craig McQueen)]

I have used a programming idiom where I want to xQueuePeek() a message queue, and attempt to send the message. If the send succeeds, then I want to drop the message from the queue. At the moment, the only way to drop the message from the queue is to call xQueueReceive(), with a non-NULL value for pvBuffer.

It would be good if xQueueReceive() would accept a NULL value for pvBuffer, allowing it to drop the next entry in the queue without the overhead of copying it to a buffer.

[aggarg (Gaurav Aggarwal)]

@cmcqueen

If the send succeeds, then I want to drop the message from the queue.

What is the more likely path? If the send succeds more often, can you do xQueueReceive and do xQueueSend/xQueueSendToFront when send fails?