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-rw-r--r--layout/build/nsLayoutStatics.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/layout/build/nsLayoutStatics.h b/layout/build/nsLayoutStatics.h
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+++ b/layout/build/nsLayoutStatics.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsLayoutStatics_h__
+#define nsLayoutStatics_h__
+
+#include "nscore.h"
+#include "MainThreadUtils.h"
+#include "nsISupportsImpl.h"
+#include "nsDebug.h"
+
+// This isn't really a class, it's a namespace for static methods.
+// Documents and other objects can hold a reference to the layout static
+// objects so that they last past the xpcom-shutdown notification.
+
+class nsLayoutStatics {
+ public:
+ // Called by the layout module constructor. This call performs an AddRef()
+ // internally.
+ static nsresult Initialize();
+
+ static void AddRef() {
+ NS_ASSERTION(NS_IsMainThread(),
+ "nsLayoutStatics reference counting must be on main thread");
+
+ NS_ASSERTION(sLayoutStaticRefcnt,
+ "nsLayoutStatics already dropped to zero!");
+
+ ++sLayoutStaticRefcnt;
+ NS_LOG_ADDREF(&sLayoutStaticRefcnt, sLayoutStaticRefcnt, "nsLayoutStatics",
+ 1);
+ }
+ static void Release() {
+ NS_ASSERTION(NS_IsMainThread(),
+ "nsLayoutStatics reference counting must be on main thread");
+
+ --sLayoutStaticRefcnt;
+ NS_LOG_RELEASE(&sLayoutStaticRefcnt, sLayoutStaticRefcnt,
+ "nsLayoutStatics");
+
+ if (!sLayoutStaticRefcnt) Shutdown();
+ }
+
+ private:
+ // not to be called!
+ nsLayoutStatics();
+
+ static void Shutdown();
+
+ static nsrefcnt sLayoutStaticRefcnt;
+};
+
+#endif // nsLayoutStatics_h__