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gstpad: Make calls to GstPadActivateFunction MT-safe

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checking whether we already were in the target GstPadMode was being
done too early and there was the risk that we *would* end up
(de)activating a pad more than once.

Instead, re-do the check for pad mode when entering the final pad
(de)activation block.

https://bugzilla.gnome.org/show_bug.cgi?id=790431
This commit is contained in:
Edward Hervey 2017-11-16 08:26:12 +01:00 committed by Edward Hervey
parent 7595c38a73
commit 80262013ca
1 changed files with 28 additions and 10 deletions
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38
gst/gstpad.c
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@ -959,12 +959,19 @@ gst_pad_mode_get_name (GstPadMode mode)
return "unknown";
}
static void
/* Returns TRUE if pad wasn't already in the new_mode */
static gboolean
pre_activate (GstPad * pad, GstPadMode new_mode)
{
switch (new_mode) {
case GST_PAD_MODE_NONE:
GST_OBJECT_LOCK (pad);
if (new_mode == GST_PAD_MODE (pad)) {
GST_WARNING_OBJECT (pad,
"Pad is already in the process of being deactivated");
GST_OBJECT_UNLOCK (pad);
return FALSE;
}
GST_DEBUG_OBJECT (pad, "setting PAD_MODE NONE, set flushing");
GST_PAD_SET_FLUSHING (pad);
pad->ABI.abi.last_flowret = GST_FLOW_FLUSHING;
@ -976,6 +983,12 @@ pre_activate (GstPad * pad, GstPadMode new_mode)
case GST_PAD_MODE_PUSH:
case GST_PAD_MODE_PULL:
GST_OBJECT_LOCK (pad);
if (new_mode == GST_PAD_MODE (pad)) {
GST_WARNING_OBJECT (pad,
"Pad is already in the process of being activated");
GST_OBJECT_UNLOCK (pad);
return FALSE;
}
GST_DEBUG_OBJECT (pad, "setting pad into %s mode, unset flushing",
gst_pad_mode_get_name (new_mode));
GST_PAD_UNSET_FLUSHING (pad);
@ -1004,6 +1017,7 @@ pre_activate (GstPad * pad, GstPadMode new_mode)
}
break;
}
return TRUE;
}
static void
@ -1173,18 +1187,22 @@ activate_mode_internal (GstPad * pad, GstObject * parent, GstPadMode mode,
/* Mark pad as needing reconfiguration */
if (active)
GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_RECONFIGURE);
pre_activate (pad, new);
if (GST_PAD_ACTIVATEMODEFUNC (pad)) {
if (G_UNLIKELY (!GST_PAD_ACTIVATEMODEFUNC (pad) (pad, parent, mode,
active)))
goto failure;
} else {
/* can happen for sinks of passthrough elements */
/* pre_activate returns TRUE if we weren't already in the process of
* switching to the 'new' mode */
if (pre_activate (pad, new)) {
if (GST_PAD_ACTIVATEMODEFUNC (pad)) {
if (G_UNLIKELY (!GST_PAD_ACTIVATEMODEFUNC (pad) (pad, parent, mode,
active)))
goto failure;
} else {
/* can happen for sinks of passthrough elements */
}
post_activate (pad, new);
}
post_activate (pad, new);
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in %s mode",
active ? "activated" : "deactivated", gst_pad_mode_get_name (mode));