The Tor Browser / file comparison
comparison: parser/html/nsHtml5StreamListener.h
parser/html/nsHtml5StreamListener.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:d691f13ae2c1 |
|---|---|
| 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 nsHtml5StreamListener_h | |
| 6 #define nsHtml5StreamListener_h | |
| 7 | |
| 8 #include "nsIStreamListener.h" | |
| 9 #include "nsIThreadRetargetableStreamListener.h" | |
| 10 #include "nsHtml5RefPtr.h" | |
| 11 #include "nsHtml5StreamParser.h" | |
| 12 | |
| 13 /** | |
| 14 * The purpose of this class is to reconcile the problem that | |
| 15 * nsHtml5StreamParser is a cycle collection participant, which means that it | |
| 16 * can only be refcounted on the main thread, but | |
| 17 * nsIThreadRetargetableStreamListener can be refcounted from another thread, | |
| 18 * so nsHtml5StreamParser being an nsIThreadRetargetableStreamListener was | |
| 19 * a memory corruption problem. | |
| 20 * | |
| 21 * mDelegate is an nsHtml5RefPtr, which releases the object that it points | |
| 22 * to from a runnable on the main thread. DropDelegate() is only called on | |
| 23 * the main thread. This call will finish before the main-thread derefs the | |
| 24 * nsHtml5StreamListener itself, so there is no risk of another thread making | |
| 25 * the refcount of nsHtml5StreamListener go to zero and running the destructor | |
| 26 * concurrently. Other than that, the thread-safe nsISupports implementation | |
| 27 * takes care of the destructor not running concurrently from different | |
| 28 * threads, so there is no need to have a mutex around nsHtml5RefPtr to | |
| 29 * prevent it from double-releasing nsHtml5StreamParser. | |
| 30 */ | |
| 31 class nsHtml5StreamListener : public nsIStreamListener, | |
| 32 public nsIThreadRetargetableStreamListener | |
| 33 { | |
| 34 public: | |
| 35 nsHtml5StreamListener(nsHtml5StreamParser* aDelegate); | |
| 36 virtual ~nsHtml5StreamListener(); | |
| 37 | |
| 38 NS_DECL_THREADSAFE_ISUPPORTS | |
| 39 NS_DECL_NSIREQUESTOBSERVER | |
| 40 NS_DECL_NSISTREAMLISTENER | |
| 41 NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER | |
| 42 | |
| 43 inline nsHtml5StreamParser* GetDelegate() | |
| 44 { | |
| 45 return mDelegate; | |
| 46 } | |
| 47 | |
| 48 void DropDelegate(); | |
| 49 | |
| 50 private: | |
| 51 nsHtml5RefPtr<nsHtml5StreamParser> mDelegate; | |
| 52 }; | |
| 53 | |
| 54 #endif // nsHtml5StreamListener_h |
