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pulsesink: release pa_shared_resource_mutex before pa_threaded_mainloop_wait

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Not doing so can result in a deadlock when two threads enter
gst_pulseringbuffer_open_device at the same time, as
pa_threaded_mainloop_wait releases the mainloop lock while waiting,
allowing another thread to take it, resulting in a deadlock as two
threads waits for the lock the other is holding.

https://bugzilla.gnome.org/show_bug.cgi?id=643087
This commit is contained in:
Philip Jägenstedt 2011-02-23 17:41:22 +01:00 committed by Arun Raghavan
parent 683c96b37a
commit dd4ec22e7e
1 changed files with 3 additions and 3 deletions
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6
ext/pulse/pulsesink.c
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@ -452,6 +452,7 @@ gst_pulseringbuffer_open_device (GstRingBuffer * buf)
pbuf->context_name = g_strdup (psink->client_name);
pa_threaded_mainloop_lock (mainloop);
g_mutex_lock (pa_shared_resource_mutex);
pctx = g_hash_table_lookup (gst_pulse_shared_contexts, pbuf->context_name);
@ -490,6 +491,8 @@ gst_pulseringbuffer_open_device (GstRingBuffer * buf)
pctx->ring_buffers = g_slist_prepend (pctx->ring_buffers, pbuf);
}
g_mutex_unlock (pa_shared_resource_mutex);
/* context created or shared okay */
pbuf->context = pa_context_ref (pctx->context);
@ -513,7 +516,6 @@ gst_pulseringbuffer_open_device (GstRingBuffer * buf)
GST_LOG_OBJECT (psink, "opened the device");
g_mutex_unlock (pa_shared_resource_mutex);
pa_threaded_mainloop_unlock (mainloop);
return TRUE;
@ -521,9 +523,7 @@ gst_pulseringbuffer_open_device (GstRingBuffer * buf)
/* ERRORS */
unlock_and_fail:
{
g_mutex_unlock (pa_shared_resource_mutex);
gst_pulsering_destroy_context (pbuf);
pa_threaded_mainloop_unlock (mainloop);
return FALSE;
}