Introduce cron_shutdown function for stopping the main background worker #381
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Normally the main background worker ued to start tasks cannot be stopped, because it always auto restarts. This SQL function can be used to stop the background worker.
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@microsoft-github-policy-service agree |
marcoslot
reviewed
Feb 28, 2025
| @@ -1 +1,7 @@ | |||
| /* no SQL changes in 1.6 */ | |||
| DROP FUNCTION IF EXISTS cron.shutdown(); | |||
| CREATE FUNCTION cron.shutdown() | |||
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this would require a new SQL script (1.7), otherwise existing 1.6 users will never get the function.
| LANGUAGE C STRICT | ||
| AS 'MODULE_PATHNAME', $$cron_shutdown$$; | ||
| COMMENT ON FUNCTION cron.shutdown() | ||
| IS 'shutdown pg_cron'; |
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should also revoke execute from public, to ensure only superuser can call this (or grant privileges)
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| LWLockAcquire(scheduler_shared_data->lock, LW_EXCLUSIVE); | ||
| pid = scheduler_shared_data->scheduler_pid; | ||
| scheduler_shared_data->scheduler_pid = 0; |
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the code style should be adapted to the rest of the project
(except the Vixie cron logic in entry.c/misc.c)
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Normally the main background worker used to start tasks cannot be stopped, because it always auto restarts.
This change introduces SQL function
cron_shutdownthat can be used to stop the background worker.It works by creating a shared memory that holds pid of the main background worker and bool flag specifying whether to restart the worker. By default, this keeps the current behaviour of automatically restarting the worker whenever it's killed. In situations when the user actually wants the main worker to be killed, It gives a way to do it.
This currently doesn't stop any other worker started by the scheduler.
The change that introduced auto-restarts is #286
Fixes #352