sync: add len and is_empty methods to mpsc senders
#7103
+156
−2
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Motivation
Closes #7077
Tldr; adds
lenandis_emptymethods to both bounded and unbounded Senders.Solution
@conradludgate mentioned in the issue in a comment that the unbounded len can be derived from the seamphore's available permits / 2. However it seems like I didn't need to divide the semaphore available permits based on tests.
The implementation of
lenfor boundedSenderdid not use the semaphore's available permits directly, and instead used the semaphore'sbound - available_permits.I've added tests for these new methods which are passing.
Related PR #7092