celery / celery / 2745

19%

Pull #2789

travis-ci

Changed multi stopwait to wait on pidfiles instead of process.

Sending signals to kill a process has a race condition where a pid may
be recycled by a new, unrelated process.

Instead, now use watchdog to watch the directory containing the
pidfile. Hold a lock until the pidfile is deleted. Once all pidfiles
are deleted, all celery processes have finished.

Introduces a dependecy on watchdog.

Fixes #2785

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