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pubsub has potentially dangerous issues when messages have to be dropped #9

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jschall opened this issue Jan 19, 2019 · 0 comments

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bug

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jschall commented Jan 19, 2019

Failure scenarios I can think of:

Messages aren't protected during write. If a low-priority publisher is writing to the oldest message in the topic group, and a high-priority publisher needs to drop that message in order to publish, the topic group memory could become corrupted.
A low-priority listener is publishing something on its own topic group, and the topic group is full. In this case, the low-priority listener might try to take its own mutex.

These sorts of issues can be prevented by ensuring that topics never run out of memory. See also #5

jschall added the bug label

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