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Clarify that cds_wfcq_dequeue_blocking() doesn't block if empty

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Ondřej Surý 2024-07-03 11:51:09 +02:00
parent b9cbd3bc76
commit 912eaf6cb9
1 changed files with 4 additions and 0 deletions
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4
lib/isc/quota.c
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@ -70,6 +70,10 @@ isc_quota_release(isc_quota_t *quota) {
* We are using the cds_wfcq_dequeue_blocking() variant here that
* has an internal mutex because we need synchronization on
* multiple dequeues running from different threads.
*
* NOTE: cds_wfcq_dequeue_blocking() checks whether the queue is free
* with cds_wfcq_empty() before acquiring the internal lock, so if
* there's nothing queued, the call should be very lightweight.
*/
struct cds_wfcq_node *node =
cds_wfcq_dequeue_blocking(&quota->jobs.head, &quota->jobs.tail);