svn commit: r196293 - head/sys/kern
Pawel Jakub Dawidek
pjd at FreeBSD.org
Mon Aug 17 08:42:34 UTC 2009
Author: pjd
Date: Mon Aug 17 08:42:34 2009
New Revision: 196293
URL: http://svn.freebsd.org/changeset/base/196293
Log:
Because taskqueue_run() can drop tq_mutex, we need to check if the
TQ_FLAGS_ACTIVE flag wasn't removed in the meantime, which means we missed a
wakeup.
Approved by: re (kib)
Modified:
head/sys/kern/subr_taskqueue.c
Modified: head/sys/kern/subr_taskqueue.c
==============================================================================
--- head/sys/kern/subr_taskqueue.c Mon Aug 17 08:38:41 2009 (r196292)
+++ head/sys/kern/subr_taskqueue.c Mon Aug 17 08:42:34 2009 (r196293)
@@ -401,6 +401,13 @@ taskqueue_thread_loop(void *arg)
TQ_LOCK(tq);
while ((tq->tq_flags & TQ_FLAGS_ACTIVE) != 0) {
taskqueue_run(tq);
+ /*
+ * Because taskqueue_run() can drop tq_mutex, we need to
+ * check if the TQ_FLAGS_ACTIVE flag wasn't removed in the
+ * meantime, which means we missed a wakeup.
+ */
+ if ((tq->tq_flags & TQ_FLAGS_ACTIVE) == 0)
+ break;
TQ_SLEEP(tq, tq, &tq->tq_mutex, 0, "-", 0);
}
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