[cairo-atomic] Rewrite reference counting using atomic ops.

Introduce an opaque cairo_reference_count_t and define operations on it
in terms of atomic ops. Update all users of reference counters to use
the new opaque type.

1 files changed, 66 insertions, 0 deletions

diff --git a/src/cairo-reference-count-private.h b/src/cairo-reference-count-private.h
new file mode 100644
index 000000000..2d1d81b8d
--- /dev/null
+++ b/src/cairo-reference-count-private.h
@@ -0,0 +1,66 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2007 Chris Wilson
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is University of Southern
+ * California.
+ *
+ * Contributor(s):
+ *	Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#ifndef CAIRO_REFRENCE_COUNT_PRIVATE_H
+#define CAIRO_REFRENCE_COUNT_PRIVATE_H
+
+#include "cairo-atomic-private.h"
+
+CAIRO_BEGIN_DECLS
+
+/* Encapsulate operations on the object's reference count */
+typedef struct {
+    cairo_atomic_int_t ref_count;
+} cairo_reference_count_t;
+
+#define _cairo_reference_count_inc(RC) _cairo_atomic_int_inc (&(RC)->ref_count)
+#define _cairo_reference_count_dec_and_test(RC) _cairo_atomic_int_dec_and_test (&(RC)->ref_count)
+
+#define CAIRO_REFERENCE_COUNT_INIT(RC, VALUE) ((RC)->ref_count = (VALUE))
+
+#define CAIRO_REFERENCE_COUNT_GET_VALUE(RC) _cairo_atomic_int_get (&(RC)->ref_count)
+#define CAIRO_REFERENCE_COUNT_SET_VALUE(RC, VALUE) _cairo_atomic_int_set (&(RC)->ref_count, (VALUE))
+
+#define CAIRO_REFERENCE_COUNT_INVALID_VALUE ((cairo_atomic_int_t) -1)
+#define CAIRO_REFERENCE_COUNT_INVALID ((cairo_reference_count_t) {CAIRO_REFERENCE_COUNT_INVALID_VALUE})
+
+#define CAIRO_REFERENCE_COUNT_IS_INVALID(RC) (CAIRO_REFERENCE_COUNT_GET_VALUE (RC) == CAIRO_REFERENCE_COUNT_INVALID_VALUE)
+
+#define CAIRO_REFERENCE_COUNT_HAS_REFERENCE(RC) (CAIRO_REFERENCE_COUNT_GET_VALUE (RC) > 0)
+
+CAIRO_END_DECLS
+
+#endif