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tpool_dispatch: fail if it cannot start at least 1 worker. 

Sponsored by: Axcient
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Wilson <gwilson@delphix.com>
Signed-off-by: Alan Somers <asomers@FreeBSD.org>
Closes #16178
This commit is contained in:
Alan Somers 2024-05-07 13:53:38 -06:00 committed by Brian Behlendorf
parent 89acef992b
commit f625d038d2
1 changed files with 20 additions and 8 deletions
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28
lib/libtpool/thread_pool.c
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@ -423,6 +423,26 @@ tpool_dispatch(tpool_t *tpool, void (*func)(void *), void *arg)
pthread_mutex_lock(&tpool->tp_mutex);
if (!(tpool->tp_flags & TP_SUSPEND)) {
if (tpool->tp_idle > 0)
(void) pthread_cond_signal(&tpool->tp_workcv);
else if (tpool->tp_current >= tpool->tp_maximum) {
/* At worker limit. Leave task on queue */
} else {
if (create_worker(tpool) == 0) {
/* Started a new worker thread */
tpool->tp_current++;
} else if (tpool->tp_current > 0) {
/* Leave task on queue */
} else {
/* Cannot start a single worker! */
pthread_mutex_unlock(&tpool->tp_mutex);
free(job);
return (-1);
}
}
}
if (tpool->tp_head == NULL)
tpool->tp_head = job;
else
@ -430,14 +450,6 @@ tpool_dispatch(tpool_t *tpool, void (*func)(void *), void *arg)
tpool->tp_tail = job;
tpool->tp_njobs++;
if (!(tpool->tp_flags & TP_SUSPEND)) {
if (tpool->tp_idle > 0)
(void) pthread_cond_signal(&tpool->tp_workcv);
else if (tpool->tp_current < tpool->tp_maximum &&
create_worker(tpool) == 0)
tpool->tp_current++;
}
pthread_mutex_unlock(&tpool->tp_mutex);
return (0);
}