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since we don't set maximum time boundaries, just rely on
the logs to properly log the dead processes.
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since we've already waited for time to elapse, there's no
point in watching the upper limit here
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Avoid the chances of misfiring when waiting on the master
process to start in case something bad happens or we're
sharing the FIFO for other purposes.
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It seems possible to have a race condition here with
the FIFO being overloaded for both start detection
and blocking. Since SIGSTOP is unavoidable, just use
that instead and sleep immediately afterwards in case
SIGSTOP is not processed in time.
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We've worked around trigger happy timeouts in the
master since we track the timeout at a lower resolution
here.
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This module will be reused in upcoming Rev-derived concurrency
models.
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