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comparison: layout/build/nsLayoutStatics.h
layout/build/nsLayoutStatics.h
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| 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/. */ | |
| 4 | |
| 5 #ifndef nsLayoutStatics_h__ | |
| 6 #define nsLayoutStatics_h__ | |
| 7 | |
| 8 #include "nscore.h" | |
| 9 #include "MainThreadUtils.h" | |
| 10 #include "nsISupportsImpl.h" | |
| 11 #include "nsDebug.h" | |
| 12 | |
| 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. | |
| 16 | |
| 17 class nsLayoutStatics | |
| 18 { | |
| 19 public: | |
| 20 // Called by the layout module constructor. This call performs an AddRef() | |
| 21 // internally. | |
| 22 static nsresult Initialize(); | |
| 23 | |
| 24 static void AddRef() | |
| 25 { | |
| 26 NS_ASSERTION(NS_IsMainThread(), | |
| 27 "nsLayoutStatics reference counting must be on main thread"); | |
| 28 | |
| 29 NS_ASSERTION(sLayoutStaticRefcnt, | |
| 30 "nsLayoutStatics already dropped to zero!"); | |
| 31 | |
| 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"); | |
| 40 | |
| 41 --sLayoutStaticRefcnt; | |
| 42 NS_LOG_RELEASE(&sLayoutStaticRefcnt, sLayoutStaticRefcnt, | |
| 43 "nsLayoutStatics"); | |
| 44 | |
| 45 if (!sLayoutStaticRefcnt) | |
| 46 Shutdown(); | |
| 47 } | |
| 48 | |
| 49 private: | |
| 50 // not to be called! | |
| 51 nsLayoutStatics(); | |
| 52 | |
| 53 static void Shutdown(); | |
| 54 | |
| 55 static nsrefcnt sLayoutStaticRefcnt; | |
| 56 }; | |
| 57 | |
| 58 class nsLayoutStaticsRef | |
| 59 { | |
| 60 public: | |
| 61 nsLayoutStaticsRef() | |
| 62 { | |
| 63 nsLayoutStatics::AddRef(); | |
| 64 } | |
| 65 ~nsLayoutStaticsRef() | |
| 66 { | |
| 67 nsLayoutStatics::Release(); | |
| 68 } | |
| 69 }; | |
| 70 | |
| 71 #endif // nsLayoutStatics_h__ |
