adjust_timeout: with default lws_plat_service_tsi allow beings passed…

… 0 timeout

Some people are calling service with zero timeout, taking care of
not busywaiting by some other external arrangements.

Adapt the forced service signalling to survive this.

lib/lws-plat-unix.c

@@ -130,19 +130,16 @@ lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
 	}
 	context->service_tid = context->service_tid_detected;
 
-	timeout_ms = lws_service_adjust_timeout(context, timeout_ms, tsi);
 	/*
 	 * is there anybody with pending stuff that needs service forcing?
 	 */
-	if (!timeout_ms) {
+	if (!lws_service_adjust_timeout(context, 1, tsi)) {
 		/* -1 timeout means just do forced service */
 		lws_plat_service_tsi(context, -1, pt->tid);
 		/* still somebody left who wants forced service? */
-		if (!lws_service_adjust_timeout(context, 1, pt->tid)) {
-			/* yes... come back again later */
-			//lwsl_debug("%s: done again\n", __func__);
-		}
-		return 0;
+		if (!lws_service_adjust_timeout(context, 1, pt->tid))
+			/* yes... come back again quickly */
+			timeout_ms = 0;
 	}
 
 	n = poll(pt->fds, pt->fds_count, timeout_ms);

lib/lws-plat-win.c

@@ -212,8 +212,17 @@ lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
 			i--;
 	}
 
-	/* if we know something needs service already, don't wait in poll */
-	timeout_ms = lws_service_adjust_timeout(context, timeout_ms, tsi);
+	/*
+	 * is there anybody with pending stuff that needs service forcing?
+	 */
+	if (!lws_service_adjust_timeout(context, 1, tsi)) {
+		/* -1 timeout means just do forced service */
+		lws_plat_service_tsi(context, -1, pt->tid);
+		/* still somebody left who wants forced service? */
+		if (!lws_service_adjust_timeout(context, 1, pt->tid))
+			/* yes... come back again quickly */
+			timeout_ms = 0;
+	}
 
 	ev = WSAWaitForMultipleEvents( 1,  pt->events , FALSE, timeout_ms, FALSE);
 	if (ev == WSA_WAIT_EVENT_0) {