cleaner compensation for spurious increment of pending in poke

Author: dgrove-oss

src/queue.c

@@ -694,6 +694,13 @@ _dispatch_root_queue_init_pthread_pool(dispatch_root_queue_context_t qc,
 		thread_pool_size = pool_size;
 	}
 	qc->dgq_thread_pool_size = thread_pool_size;
+	if (qc->dgq_kworkqueue == (void*)(~0ul)) {
+		// when _dispatch_root_queues_init is invoked from
+		// _dispatch_global_queue_poke_slow we need to clear
+		// dgq_pending here because qc->dgq_kworkqueue wasn't
+		// initialized to (~0ul) when we went through _dispatch_global_queue_poke
+		qc->dgq_pending = 0;
+	}
 #if HAVE_PTHREAD_WORKQUEUES
 	if (qc->dgq_qos) {
 		(void)dispatch_assume_zero(pthread_attr_init(&pqc->dpq_thread_attr));
@@ -4060,9 +4067,6 @@ _dispatch_global_queue_poke(dispatch_queue_t dq, int n, int floor)
 #if HAVE_PTHREAD_WORKQUEUES
 	dispatch_root_queue_context_t qc = dq->do_ctxt;
 	if (
-#if HAVE_INTERNAL_PTHREAD_WORKQUEUE
-		false && /* counting done in poke_slow for this config */
-#endif
 #if DISPATCH_USE_PTHREAD_POOL
 		(qc->dgq_kworkqueue != (void*)(~0ul)) &&
 #endif