From f42d7e6ac838de485206dcdfd8f65031863ecb25 Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Tue, 19 Nov 2002 02:29:18 +0000
Subject: [PATCH] Added gst_data_needs_copy_on_write()

Original commit message from CVS:
Added gst_data_needs_copy_on_write()
---
 gst/gstdata.c | 20 ++++++++++++++++++++
 gst/gstdata.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/gst/gstdata.c b/gst/gstdata.c
index 72d01e8a1b..afc99e2c69 100644
--- a/gst/gstdata.c
+++ b/gst/gstdata.c
@@ -92,6 +92,26 @@ gst_data_copy (const GstData *data)
   return NULL;
 }
 
+/**
+ * gst_data_needs_copy_on_write:
+ * @data: a #GstData to copy
+ *
+ * Returns: TRUE if the given #GstData is potentially shared and needs to
+ * be copied before it can be modified safely.
+ */
+gboolean
+gst_data_needs_copy_on_write (GstData *data) 
+{
+  gint refcount;
+
+  GST_ATOMIC_INT_READ (&data->refcount, &refcount);
+
+  if (refcount == 1 && !GST_DATA_FLAG_IS_SET (data, GST_DATA_READONLY))
+    return FALSE;
+
+  return TRUE;
+}
+
 /**
  * gst_data_copy_on_write:
  * @data: a #GstData to copy
diff --git a/gst/gstdata.h b/gst/gstdata.h
index 20b85ba07d..0a17e23c51 100644
--- a/gst/gstdata.h
+++ b/gst/gstdata.h
@@ -87,6 +87,7 @@ void			gst_data_copy_into		(const GstData *data, GstData *target);
 
 /* basic operations on data */
 GstData*		gst_data_copy	 		(const GstData *data);
+gboolean 		gst_data_needs_copy_on_write 	(GstData *data);
 GstData* 		gst_data_copy_on_write 		(GstData *data);
 void 			gst_data_free	 		(GstData *data);