Ensure that prio msgq markers are only installed when needed - #11485
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Priority message queue markers were sometimes installed in the message queue even when no priority messages could be received. As a result, the two markers had to be traversed unnecessarily when scanning the message queue, introducing a small but avoidable overhead.
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Priority message queue markers were sometimes installed in the message queue even when no priority messages could be received. As a result, the two markers had to be traversed unnecessarily when scanning the message queue, introducing a small but avoidable overhead.
Thanks to @Maria-12648430 for reporting the issue.