X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;ds=sidebyside;f=ao_write.c;h=a2e86ed258c5857ff10014ea99d1335009e2a97b;hb=d2c65fd068a5c2e7cde52bd06e1eadc7e7e37364;hp=52c4b11e1a11c51a419bb32bbc58c6052c7221cd;hpb=751e3811e99c744f9f651b191950010ce118eb78;p=paraslash.git

diff --git a/ao_write.c b/ao_write.c
index 52c4b11e..a2e86ed2 100644
--- a/ao_write.c
+++ b/ao_write.c
@@ -51,14 +51,34 @@ static void aow_pre_select(struct sched *s, struct task *t)
 	struct private_aow_data *pawd = wn->private_data;
 	int ret;
 
-	if (pawd)
-		pthread_mutex_lock(&pawd->mutex);
+	if (!pawd) { /* not yet started */
+		assert(wn->btrn);
+		ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
+		if (ret != 0)
+			goto min_delay;
+		return; /* no data available */
+	}
+	if (!wn->btrn) { /* EOF */
+		if (!pawd->thread_btrn) /* ready to exit */
+			goto min_delay;
+		/* wait for the play thread to terminate */
+		goto timeout;
+	}
+	pthread_mutex_lock(&pawd->mutex);
 	ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
-	if (pawd)
-		pthread_mutex_unlock(&pawd->mutex);
-
-	if (ret == 0)
-		return;
+	pthread_mutex_unlock(&pawd->mutex);
+	if (ret != 0)
+		goto min_delay;
+	/*
+	 * Even though the node status is zero, we might have data available,
+	 * but the output buffer is full. If we don't set a timeout here, we
+	 * are woken up only if new data arrives, which might be too late and
+	 * result in a buffer underrun in the playing thread. To avoid this we
+	 * never sleep longer than the (default) buffer time.
+	 */
+timeout:
+	return sched_request_timeout_ms(20, s);
+min_delay:
 	sched_min_delay(s);
 }
 
@@ -239,6 +259,7 @@ unlock:
 out:
 	assert(ret < 0);
 	PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+	btr_remove_node(&pawd->thread_btrn);
 	pthread_exit(NULL);
 }
 
@@ -323,6 +344,12 @@ static int aow_post_select(__a_unused struct sched *s,
 			goto remove_thread_btrn;
 		return 0;
 	}
+	if (!wn->btrn) {
+		if (!pawd->thread_btrn)
+			return -E_AO_EOF;
+		PARA_INFO_LOG("waiting for play thread to terminate\n");
+		return 0;
+	}
 	pthread_mutex_lock(&pawd->mutex);
 	ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
 	if (ret > 0) {
@@ -334,10 +361,9 @@ static int aow_post_select(__a_unused struct sched *s,
 		goto out;
 	pthread_mutex_lock(&pawd->mutex);
 	btr_remove_node(&wn->btrn);
-	PARA_INFO_LOG("waiting for thread to terminate\n");
 	pthread_cond_signal(&pawd->data_available);
 	pthread_mutex_unlock(&pawd->mutex);
-	pthread_join(pawd->thread, NULL);
+	return 0;
 remove_thread_btrn:
 	btr_remove_node(&pawd->thread_btrn);
 remove_btrn: