layout/build/nsLayoutStatics.h@b8a032363ba2 (annotated)
layout/build/nsLayoutStatics.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef nsLayoutStatics_h__ |
| michael@0 | 6 | #define nsLayoutStatics_h__ |
| michael@0 | 7 | |
| michael@0 | 8 | #include "nscore.h" |
| michael@0 | 9 | #include "MainThreadUtils.h" |
| michael@0 | 10 | #include "nsISupportsImpl.h" |
| michael@0 | 11 | #include "nsDebug.h" |
| michael@0 | 12 | |
| michael@0 | 13 | // This isn't really a class, it's a namespace for static methods. |
| michael@0 | 14 | // Documents and other objects can hold a reference to the layout static |
| michael@0 | 15 | // objects so that they last past the xpcom-shutdown notification. |
| michael@0 | 16 | |
| michael@0 | 17 | class nsLayoutStatics |
| michael@0 | 18 | { |
| michael@0 | 19 | public: |
| michael@0 | 20 | // Called by the layout module constructor. This call performs an AddRef() |
| michael@0 | 21 | // internally. |
| michael@0 | 22 | static nsresult Initialize(); |
| michael@0 | 23 | |
| michael@0 | 24 | static void AddRef() |
| michael@0 | 25 | { |
| michael@0 | 26 | NS_ASSERTION(NS_IsMainThread(), |
| michael@0 | 27 | "nsLayoutStatics reference counting must be on main thread"); |
| michael@0 | 28 | |
| michael@0 | 29 | NS_ASSERTION(sLayoutStaticRefcnt, |
| michael@0 | 30 | "nsLayoutStatics already dropped to zero!"); |
| michael@0 | 31 | |
| michael@0 | 32 | ++sLayoutStaticRefcnt; |
| michael@0 | 33 | NS_LOG_ADDREF(&sLayoutStaticRefcnt, sLayoutStaticRefcnt, |
| michael@0 | 34 | "nsLayoutStatics", 1); |
| michael@0 | 35 | } |
| michael@0 | 36 | static void Release() |
| michael@0 | 37 | { |
| michael@0 | 38 | NS_ASSERTION(NS_IsMainThread(), |
| michael@0 | 39 | "nsLayoutStatics reference counting must be on main thread"); |
| michael@0 | 40 | |
| michael@0 | 41 | --sLayoutStaticRefcnt; |
| michael@0 | 42 | NS_LOG_RELEASE(&sLayoutStaticRefcnt, sLayoutStaticRefcnt, |
| michael@0 | 43 | "nsLayoutStatics"); |
| michael@0 | 44 | |
| michael@0 | 45 | if (!sLayoutStaticRefcnt) |
| michael@0 | 46 | Shutdown(); |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | private: |
| michael@0 | 50 | // not to be called! |
| michael@0 | 51 | nsLayoutStatics(); |
| michael@0 | 52 | |
| michael@0 | 53 | static void Shutdown(); |
| michael@0 | 54 | |
| michael@0 | 55 | static nsrefcnt sLayoutStaticRefcnt; |
| michael@0 | 56 | }; |
| michael@0 | 57 | |
| michael@0 | 58 | class nsLayoutStaticsRef |
| michael@0 | 59 | { |
| michael@0 | 60 | public: |
| michael@0 | 61 | nsLayoutStaticsRef() |
| michael@0 | 62 | { |
| michael@0 | 63 | nsLayoutStatics::AddRef(); |
| michael@0 | 64 | } |
| michael@0 | 65 | ~nsLayoutStaticsRef() |
| michael@0 | 66 | { |
| michael@0 | 67 | nsLayoutStatics::Release(); |
| michael@0 | 68 | } |
| michael@0 | 69 | }; |
| michael@0 | 70 | |
| michael@0 | 71 | #endif // nsLayoutStatics_h__ |
