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ext/jack/gstjackaudioclient.c: Don't need to take the connection lock, it will not be used and could cause deadlocks.

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Original commit message from CVS:
Based on patch by: Paul Davis <paul at linuxaudiosystems dot com>
* ext/jack/gstjackaudioclient.c: (gst_jack_audio_unref_connection):
Don't need to take the connection lock, it will not be used and could
cause deadlocks.
This commit is contained in:
Paul Davis 2007-03-18 17:57:48 +00:00 committed by Tim-Philipp Müller
parent 60bcffa5ef
commit a70ffeed7c
1 changed files with 19 additions and 7 deletions
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26
ext/jack/gstjackaudioclient.c
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@ -283,18 +283,32 @@ static void
gst_jack_audio_unref_connection (GstJackAudioConnection * conn) gst_jack_audio_unref_connection (GstJackAudioConnection * conn)
{ {
gint res; gint res;
gboolean zero;
GST_DEBUG ("unref connection %p", conn); GST_DEBUG ("unref connection %p refcnt %d", conn, conn->refcount);
G_LOCK (connections_lock); G_LOCK (connections_lock);
conn->refcount--; conn->refcount--;
if (conn->refcount == 0) { if ((zero = (conn->refcount == 0))) {
GST_DEBUG ("closing connection %p", conn); GST_DEBUG ("closing connection %p", conn);
/* remove from list */ /* remove from list, we can release the mutex after removing the connection
* from the list because after that, nobody can access the connection anymore. */
connections = g_list_remove (connections, conn); connections = g_list_remove (connections, conn);
}
G_UNLOCK (connections_lock);
/* grab lock to be sure that we are not in one of the callbacks */ /* if we are zero, close and cleanup the connection */
g_mutex_lock (conn->lock); if (zero) {
/* don't use conn->lock here. two reasons:
*
* 1) its not necessary: jack_deactivate() will not return until the JACK thread
* associated with this connection is cleaned up by a thread join, hence
* no more callbacks can occur or be in progress.
*
* 2) it would deadlock anyway, because jack_deactivate() will sleep
* waiting for the JACK thread, and can thus cause deadlock in
* jack_process_cb()
*/
if ((res = jack_deactivate (conn->client))) { if ((res = jack_deactivate (conn->client))) {
/* we only warn, this means the server is probably shut down and the client /* we only warn, this means the server is probably shut down and the client
* is gone anyway. */ * is gone anyway. */
@ -305,7 +319,6 @@ gst_jack_audio_unref_connection (GstJackAudioConnection * conn)
/* we assume the client is gone. */ /* we assume the client is gone. */
GST_WARNING ("close failed (%d)", res); GST_WARNING ("close failed (%d)", res);
} }
g_mutex_unlock (conn->lock);
/* free resources */ /* free resources */
g_mutex_free (conn->lock); g_mutex_free (conn->lock);
@ -313,7 +326,6 @@ gst_jack_audio_unref_connection (GstJackAudioConnection * conn)
g_free (conn->server); g_free (conn->server);
g_free (conn); g_free (conn);
} }
G_UNLOCK (connections_lock);
} }
static void static void