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Check collector has started in pg_wait_sampling_reset_profile. #100

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Check collector has started in pg_wait_sampling_reset_profile. #100

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18 changes: 18 additions & 0 deletions pg_wait_sampling.c
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Original file line number Diff line number Diff line change
Expand Up @@ -808,8 +808,26 @@ pg_wait_sampling_reset_profile(PG_FUNCTION_ARGS)
{
LOCKTAG collectorTag;

/*
* This also guards against the case when the
* extension was not loaded at all, but this
* function was called. pgws_collector_hdr is
* NULL in this case.
*/
check_shmem();

/* The collector may have not started yet (it'd be a
* race condition with background worker startup to
* use latch without a check here).
* Or worse, registration of the worker might have been
* denied, if there are too many workers already.
* This is why we cannot wait for its start with a while
* loop.
*/
if (!pgws_collector_hdr->latch)
ereport(ERROR, (errcode(ERRCODE_INTERNAL_ERROR),
errmsg("pg_wait_sampling collector wasn't started")));

pgws_init_lock_tag(&queueTag, PGWS_QUEUE_LOCK);

LockAcquire(&queueTag, ExclusiveLock, false, false);
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