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The previous coding relied on the PID file appearing and the query starting "fast enough", which can fail on slow machines. Also, there might have been an undocumented interference between alarm and IPC::Run. This new coding doesn't rely on any of these concurrency mechanisms. Instead, we wait unitl the PID file is complete before proceeding, and then also wait until the sleep query is registered by the server. Discussion: https://www.postgresql.org/message-id/flat/E1mH14Q-0002gh-HS%40gemulon.postgresql.org