mavlink / MAVSDK

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LAST BUILD ON BRANCH refs/tags/v2.12.8

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• refs/tags/v2.12.8
• 133-race-in-grpc
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• import-qgc-plan-mission
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Build # 11155262327

Build Type

push

github

Committed by web-flow

Commit Message

core: prevent lockup on connection destruction (#2412)

When we destroy Mavsdk and clear the list of connections, we likely
end up in a deadlock.

What happens is that:
1. A connection wants to forward a message and is trying to acquire the
   connection mutex.
2. At the same time, the connection is being destroyed, so we are
   waiting for the connection receive thread to be joinable. While the
   connections are being destroyed, we have the connection mutex which
   is blocking 1.

The proposed solution is to:
1. Make it less likely by acquiring the connection mutex properly before
   checking _connections.size() and not for the individual connections.
2. Check the _should_exit flag before trying to acquire the mutex. I
   believe by the time the connections are being cleared, this flag is
   set, and hence the deadlock should not happen, fingers crossed.

Run Details

5 of 13 new or added lines in 1 file covered. (38.46%)

3 existing lines in 1 file now uncovered.

11107 of 29722 relevant lines covered (37.37%)

255.2 hits per line