Function grouptask_block

freebsd/kern/subr_gtaskqueue.c:190–206

* Wait for all to complete, then prevent it from being enqueued */

 * Wait for all to complete, then prevent it from being enqueued
 */
void
grouptask_block(struct grouptask *grouptask)
{
	struct gtaskqueue *queue = grouptask->gt_taskqueue;
	struct gtask *gtask = &grouptask->gt_task;

#ifdef INVARIANTS
	if (queue == NULL) {
		gtask_dump(gtask);
		panic("queue == NULL");
	}
#endif
	TQ_LOCK(queue);
	gtask->ta_flags |= TASK_NOENQUEUE;
  	gtaskqueue_drain_locked(queue, gtask);
	TQ_UNLOCK(queue);
}

void
grouptask_unblock(struct grouptask *grouptask)