On Sun, Feb 19, 2017 at 5:54 PM, Robert Haas <robertmh...@gmail.com> wrote: > However, it looks like there's a race condition here, because the slot > doesn't get freed up at the same time that the PID gets set to 0. > That actually happens later, when the postmaster calls > maybe_start_bgworker() or DetermineSleepTime() and one of those > functions calls ForgetBackgroundWorker(). We could tighten this up by > changing CleanupBackgroundWorker() to also call > ForgetBackgroundWorker() immediately after calling > ReportBackgroundWorker() if rw->rw_terminate || > rw->rw_worker.bgw_restart_time == BGW_NEVER_RESTART. If we do that > BEFORE sending the notification to the starting process, that closes > this hole. Almost.
And here's a patch implementing something along those lines. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
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