The Tor Browser: layout/build/nsLayoutStatics.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #ifndef nsLayoutStatics_h__

     6 #define nsLayoutStatics_h__

     8 #include "nscore.h"

     9 #include "MainThreadUtils.h"

    10 #include "nsISupportsImpl.h"

    11 #include "nsDebug.h"

    13 // This isn't really a class, it's a namespace for static methods.

    14 // Documents and other objects can hold a reference to the layout static

    15 // objects so that they last past the xpcom-shutdown notification.

    17 class nsLayoutStatics

    18 {

    19 public:

    20   // Called by the layout module constructor. This call performs an AddRef()

    21   // internally.

    22   static nsresult Initialize();

    24   static void AddRef()

    25   {

    26     NS_ASSERTION(NS_IsMainThread(),

    27                  "nsLayoutStatics reference counting must be on main thread");

    29     NS_ASSERTION(sLayoutStaticRefcnt,

    30                  "nsLayoutStatics already dropped to zero!");

    32     ++sLayoutStaticRefcnt;

    33     NS_LOG_ADDREF(&sLayoutStaticRefcnt, sLayoutStaticRefcnt,

    34                   "nsLayoutStatics", 1);

    35   }

    36   static void Release()

    37   {

    38     NS_ASSERTION(NS_IsMainThread(),

    39                  "nsLayoutStatics reference counting must be on main thread");

    41     --sLayoutStaticRefcnt;

    42     NS_LOG_RELEASE(&sLayoutStaticRefcnt, sLayoutStaticRefcnt,

    43                    "nsLayoutStatics");

    45     if (!sLayoutStaticRefcnt)

    46       Shutdown();

    47   }

    49 private:

    50   // not to be called!

    51   nsLayoutStatics();

    53   static void Shutdown();

    55   static nsrefcnt sLayoutStaticRefcnt;

    56 };

    58 class nsLayoutStaticsRef

    59 {

    60 public:

    61   nsLayoutStaticsRef()

    62   {

    63     nsLayoutStatics::AddRef();

    64   }

    65   ~nsLayoutStaticsRef()

    66   {

    67     nsLayoutStatics::Release();

    68   }

    69 };

    71 #endif // nsLayoutStatics_h__

The Tor Browser / file revision