From dcfe540627e65381697785201af5cd6fc90ac3c9 Mon Sep 17 00:00:00 2001

From: Takashi Iwai <tiwai@suse.de>

Date: Wed, 30 May 2012 12:56:55 +0200

Subject: [PATCH 2/9] Fix alsaseq polling at idle time

The select() must be called even at idle time.  Otherwise it goes to

busy loop.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

---

 interface/alsaseq_c.c |   27 +++++++++++++--------------

 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/interface/alsaseq_c.c b/interface/alsaseq_c.c

index 876a62c..1785ab1 100644

--- a/interface/alsaseq_c.c

+++ b/interface/alsaseq_c.c

@@ -484,6 +484,8 @@ static void stop_playing(void)

 static void doit(struct seq_context *ctxp)

 {

+	fd_set rfds;

+	struct timeval timeout;

 	for (;;) {

 		while (snd_seq_event_input_pending(ctxp->handle, 1)) {

 			if (do_sequencer(ctxp))

@@ -511,20 +513,17 @@ static void doit(struct seq_context *ctxp)

 			play_event(&ev);

 			aq_fill_nonblocking();

 		}

-		if (! ctxp->active || ! IS_STREAM_TRACE) {

-			fd_set rfds;

-			FD_ZERO(&rfds);

-			FD_SET(ctxp->fd, &rfds);

-			if (! IS_STREAM_TRACE) {

-				struct timeval timeout;

-				timeout.tv_sec = 0;

-				timeout.tv_usec = 10000; /* 10ms */

-				if (select(ctxp->fd + 1, &rfds, NULL, NULL, &timeout) < 0)

-					goto __done;

-			} else {

-				if (select(ctxp->fd + 1, &rfds, NULL, NULL, NULL) < 0)

-					goto __done;

-			}				

+

+		FD_ZERO(&rfds);

+		FD_SET(ctxp->fd, &rfds);

+		if (ctxp->active) {

+			timeout.tv_sec = 0;

+			timeout.tv_usec = 10000; /* 10ms */

+			if (select(ctxp->fd + 1, &rfds, NULL, NULL, &timeout) < 0)

+				goto __done;

+		} else {

+			if (select(ctxp->fd + 1, &rfds, NULL, NULL, NULL) < 0)

+				goto __done;

 		}

 	}

-- 

1.7.9.2