lock.go: fix another race condition #1214
Merged
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The previous fix to
consul lock
(commit 6875e8d) didn't completelyeliminate the race that could occur if the lock was acquired around the
same time SIGTERM was received: It was still possible for
Run() to spawn the process via startChild() after killChild() had
released the shared mutex.
Now, when SIGTERM is received, we acquire a mutex that prevents
spawning a new process and never release it.
We've tested this fix pretty thoroughly and believe it completely
resolves the issue.