GODOT IS OPEN SOURCE

1 files changed, 55 insertions, 0 deletions

diff --git a/core/safe_refcount.cpp b/core/safe_refcount.cpp
new file mode 100644
index 0000000000..3d867448e8
--- /dev/null
+++ b/core/safe_refcount.cpp
@@ -0,0 +1,55 @@
+/*************************************************************************/
+/*  safe_refcount.cpp                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+#include "safe_refcount.h"
+
+
+#ifdef _MSC_VER
+
+// don't pollute my namespace!
+#include <windows.h>
+long atomic_conditional_increment( register long * pw ) {
+
+	/* try to increment until it actually works */
+	// taken from boost
+
+	while (true) {
+		long tmp = static_cast< long const volatile& >( *pw );
+		if( tmp == 0 ) 
+      return 0; // if zero, can't add to it anymore
+		if( InterlockedCompareExchange( pw, tmp + 1, tmp ) == tmp ) 
+			return tmp+1;
+	}
+
+}
+
+long atomic_decrement( register long * pw ) {
+	return InterlockedDecrement( pw );
+}
+
+#endif