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libs/gst/base/gstcollectpads.*: Add refcounting to the collectpads data so we can track when it's safe to free the da...

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Original commit message from CVS:
Patch by: Sjoerd Simons <sjoerd at luon dot net>
* libs/gst/base/gstcollectpads.c: (ref_data), (unref_data),
(gst_collect_pads_add_pad), (gst_collect_pads_remove_pad),
(gst_collect_pads_stop), (gst_collect_pads_event),
(gst_collect_pads_chain):
* libs/gst/base/gstcollectpads.h:
Add refcounting to the collectpads data so we can track when it's safe
to free the data. Fixes #383382.
This commit is contained in:
Sjoerd Simons 2006-12-16 15:17:54 +00:00 committed by Wim Taymans
parent 6e2306d436
commit 9479446ad8
3 changed files with 86 additions and 27 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2006-12-16 Wim Taymans <wim@fluendo.com>
Patch by: Sjoerd Simons <sjoerd at luon dot net>
* libs/gst/base/gstcollectpads.c: (ref_data), (unref_data),
(gst_collect_pads_add_pad), (gst_collect_pads_remove_pad),
(gst_collect_pads_stop), (gst_collect_pads_event),
(gst_collect_pads_chain):
* libs/gst/base/gstcollectpads.h:
Add refcounting to the collectpads data so we can track when it's safe
to free the data. Fixes #383382.
2006-12-15 Wim Taymans <wim@fluendo.com>
* libs/gst/base/gstcollectpads.c: (gst_collect_pads_add_pad),

100
libs/gst/base/gstcollectpads.c
View file

@ -192,6 +192,30 @@ gst_collect_pads_set_function (GstCollectPads * pads,
GST_OBJECT_UNLOCK (pads);
}
static void
ref_data (GstCollectData * data)
{
g_assert (data != NULL);
g_atomic_int_inc (&(data->abidata.ABI.refcount));
}
static void
unref_data (GstCollectData * data)
{
g_assert (data != NULL);
g_assert (data->abidata.ABI.refcount > 0);
if (!g_atomic_int_dec_and_test (&(data->abidata.ABI.refcount)))
return;
g_object_unref (data->pad);
if (data->buffer) {
gst_buffer_unref (data->buffer);
}
g_free (data);
}
/**
* gst_collect_pads_add_pad:
* @pads: the collectspads to use
@ -236,13 +260,16 @@ gst_collect_pads_add_pad (GstCollectPads * pads, GstPad * pad, guint size)
data->abidata.ABI.flushing = FALSE;
data->abidata.ABI.new_segment = FALSE;
data->abidata.ABI.eos = FALSE;
data->abidata.ABI.refcount = 1;
GST_COLLECT_PADS_PAD_LOCK (pads);
GST_OBJECT_LOCK (pad);
gst_pad_set_element_private (pad, data);
GST_OBJECT_UNLOCK (pad);
pads->abidata.ABI.pad_list =
g_slist_append (pads->abidata.ABI.pad_list, data);
gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads_chain));
gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads_event));
gst_pad_set_element_private (pad, data);
/* activate the pad when needed */
if (pads->started)
gst_pad_set_active (pad, TRUE);
@ -302,13 +329,9 @@ gst_collect_pads_remove_pad (GstCollectPads * pads, GstPad * pad)
/* clear the stuff we configured */
gst_pad_set_chain_function (pad, NULL);
gst_pad_set_event_function (pad, NULL);
/* FIXME, check that freeing the private data does not causes
* crashes in the streaming thread */
GST_OBJECT_LOCK (pad);
gst_pad_set_element_private (pad, NULL);
/* deactivate the pad when needed */
if (!pads->started)
gst_pad_set_active (pad, FALSE);
GST_OBJECT_UNLOCK (pad);
/* backward compat, also remove from data if stopped */
if (!pads->started) {
@ -325,13 +348,15 @@ gst_collect_pads_remove_pad (GstCollectPads * pads, GstPad * pad)
pads->abidata.ABI.pad_cookie++;
/* clean and free the collect data */
gst_object_unref (data->pad);
if (data->buffer)
gst_buffer_unref (data->buffer);
g_free (data);
unref_data (data);
/* signal waiters because something changed */
GST_COLLECT_PADS_BROADCAST (pads);
/* deactivate the pad when needed */
if (!pads->started)
gst_pad_set_active (pad, FALSE);
GST_COLLECT_PADS_PAD_UNLOCK (pads);
return TRUE;
@ -561,7 +586,7 @@ gst_collect_pads_stop (GstCollectPads * pads)
}
GST_COLLECT_PADS_PAD_UNLOCK (pads);
/* Wake them up so then can end the chain functions. */
/* Wake them up so they can end the chain functions. */
GST_COLLECT_PADS_BROADCAST (pads);
GST_OBJECT_UNLOCK (pads);
@ -904,9 +929,12 @@ gst_collect_pads_event (GstPad * pad, GstEvent * event)
GstCollectPads *pads;
/* some magic to get the managing collect_pads */
GST_OBJECT_LOCK (pad);
data = (GstCollectData *) gst_pad_get_element_private (pad);
if (G_UNLIKELY (data == NULL))
goto not_ours;
goto pad_removed;
ref_data (data);
GST_OBJECT_UNLOCK (pad);
res = TRUE;
@ -1014,12 +1042,14 @@ forward:
res = gst_pad_event_default (pad, event);
done:
unref_data (data);
return res;
/* ERRORS */
not_ours:
pad_removed:
{
GST_WARNING ("not our pad");
GST_DEBUG ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
return FALSE;
}
}
@ -1042,15 +1072,17 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
GST_DEBUG ("Got buffer for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
/* some magic to get the managing collect_pads */
GST_OBJECT_LOCK (pad);
data = (GstCollectData *) gst_pad_get_element_private (pad);
if (G_UNLIKELY (data == NULL))
goto not_ours;
goto no_data;
ref_data (data);
GST_OBJECT_UNLOCK (pad);
pads = data->collect;
size = GST_BUFFER_SIZE (buffer);
GST_OBJECT_LOCK (pads);
/* if not started, bail out */
if (G_UNLIKELY (!pads->started))
goto not_started;
@ -1091,13 +1123,22 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
if (data->buffer == NULL)
break;
/* Check if we got removed in the mean time, FIXME, this is racy.
* Between this check and the _WAIT, the pad could be removed which will
* makes us hang in the _WAIT. */
GST_OBJECT_LOCK (pad);
if (G_UNLIKELY (gst_pad_get_element_private (pad) == NULL))
goto pad_removed;
GST_OBJECT_UNLOCK (pad);
GST_DEBUG ("Pad %s:%s has a buffer queued, waiting",
GST_DEBUG_PAD_NAME (pad));
/* wait to be collected, this must happen from another thread triggered
* by the _chain function of another pad. We release the lock so we
* can get stopped or flushed as well. We can however not get EOS
* because we still hold the STREAM_LOCK. */
* because we still hold the STREAM_LOCK.
*/
GST_COLLECT_PADS_WAIT (pads);
GST_DEBUG ("Pad %s:%s resuming", GST_DEBUG_PAD_NAME (pad));
@ -1113,19 +1154,24 @@ gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer)
unlock_done:
GST_OBJECT_UNLOCK (pads);
done:
unref_data (data);
gst_buffer_unref (buffer);
return ret;
/* ERRORS */
not_ours:
pad_removed:
{
/* pretty fatal this one, can't post an error though... */
GST_WARNING ("not our pad");
ret = GST_FLOW_ERROR;
goto done;
GST_WARNING ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
ret = GST_FLOW_NOT_LINKED;
goto unlock_done;
}
/* ERRORS */
no_data:
{
GST_DEBUG ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
gst_buffer_unref (buffer);
return GST_FLOW_NOT_LINKED;
}
not_started:
{

1
libs/gst/base/gstcollectpads.h
View file

@ -62,6 +62,7 @@ struct _GstCollectData
gboolean flushing;
gboolean new_segment;
gboolean eos;
gint refcount;
} ABI;
/* adding + 0 to mark ABI change to be undone later */
gpointer _gst_reserved[GST_PADDING + 0];