From: Andre Noll <maan@systemlinux.org>
Date: Sun, 10 Feb 2008 13:20:09 +0000 (+0100)
Subject: Speed up audiod_pre_select.
X-Git-Tag: v0.3.1~23
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=19e10ff96914706d93f3c92bc325dc6ec62a8508;ds=sidebyside

Speed up audiod_pre_select.

Catch the common case early in the function to minimize the
number of checks for that case.
---

diff --git a/audiod.c b/audiod.c
index 701f8278..dee31d5c 100644
--- a/audiod.c
+++ b/audiod.c
@@ -599,6 +599,8 @@ static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 		a = &afi[sl->format];
 		if (!sl->receiver_node)
 			continue;
+		if ((!a->num_filters || sl->fc) && sl->wng)
+			continue; /* everything already started */
 		if (!a->num_filters) {
 			if (sl->receiver_node->loaded && !sl->wng) {
 				open_writers(i);
@@ -611,7 +613,7 @@ static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 			s->timeout = min_delay;
 			continue;
 		}
-		if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
+		if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 			continue;
 		if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 			open_writers(i);