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When a message queue is configured from the stack, that main function must never return -- otherwise, during sched_task_exit (which the thread's function "returns" to), message senders might still send messages into already freed stack space (which would be reused by sched_task_exit). Co-authored-by: Marian Buschsieweke <maribu@users.noreply.github.com>
Background
This test application checks for the behavior reported in https://github.com/RIOT-OS/RIOT/issues/100:
Usually, when a thread (here sender_thread) sends a message to another thread (here the main thread) whose message queue already holds a message, the message of sender_thread is copied into main's message queue and sender_thread is set to STATUS_PENDING. However, this should not happen if sender_thread is currently in STATUS_REPLY_BLOCKED mode, since it is in the middle of a different, blocking send.
In the aforementioned issue, it was reported that this undesired behavior was happening. It has been fixed since, and this test ensures that it doesn't re-occur again.
Expected result
The output should look as follows:
sender_thread start
main thread alive
If you see
ERROR: sender_thread should be blocking
something went wrong.