unlimited select() timeout

mpd sets a 1s select() timeout for no reason. This makes mpd wake up the CPU, consume some cycles just to see there is nothing to do. We can save that by specifying NULL instead of a timeout. git-svn-id: https://svn.musicpd.org/mpd/trunk@7212 09075e82-0dd4-0310-85a5-a0d7c8717e4f

unlimited select() timeout
f9e317cc · Max Kellermann · Eric Wong · d78ddd1e · f9e317cc
Commit f9e317cc authored Mar 26, 2008 by Max Kellermann Committed by Eric Wong Mar 26, 2008
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Showing with 3 additions and 5 deletions

interface.c src/interface.c +3 -5

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--- a/src/interface.c
+++ b/src/interface.c
@@ -478,14 +478,11 @@ int doIOForInterfaces(void)
 	fd_set rfds;
 	fd_set wfds;
 	fd_set efds;
-	struct timeval tv;
+	struct timeval tv, *tvp = NULL;
 	int i;
 	int selret;
 	int fdmax;

-	tv.tv_sec = 1;
-	tv.tv_usec = 0;
-
 	while (1) {
 		fdmax = 0;

@@ -495,7 +492,7 @@ int doIOForInterfaces(void)

 		registered_IO_add_fds(&fdmax, &rfds, &wfds, &efds);

-		selret = select(fdmax + 1, &rfds, &wfds, &efds, &tv);
+		selret = select(fdmax + 1, &rfds, &wfds, &efds, tvp);

 		if (selret < 0 && errno == EINTR)
 			break;
@@ -530,6 +527,7 @@ int doIOForInterfaces(void)

 		tv.tv_sec = 0;
 		tv.tv_usec = 0;
+		tvp = &tv;
 	}

 	return 1;