mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-11-03 19:05:35 +00:00
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
/* 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 nsHtml5StreamListener_h
|
|
#define nsHtml5StreamListener_h
|
|
|
|
#include "nsIStreamListener.h"
|
|
#include "nsIThreadRetargetableStreamListener.h"
|
|
#include "nsHtml5RefPtr.h"
|
|
#include "nsHtml5StreamParser.h"
|
|
|
|
/**
|
|
* The purpose of this class is to reconcile the problem that
|
|
* nsHtml5StreamParser is a cycle collection participant, which means that it
|
|
* can only be refcounted on the main thread, but
|
|
* nsIThreadRetargetableStreamListener can be refcounted from another thread,
|
|
* so nsHtml5StreamParser being an nsIThreadRetargetableStreamListener was
|
|
* a memory corruption problem.
|
|
*
|
|
* mDelegate is an nsHtml5RefPtr, which releases the object that it points
|
|
* to from a runnable on the main thread. DropDelegate() is only called on
|
|
* the main thread. This call will finish before the main-thread derefs the
|
|
* nsHtml5StreamListener itself, so there is no risk of another thread making
|
|
* the refcount of nsHtml5StreamListener go to zero and running the destructor
|
|
* concurrently. Other than that, the thread-safe nsISupports implementation
|
|
* takes care of the destructor not running concurrently from different
|
|
* threads, so there is no need to have a mutex around nsHtml5RefPtr to
|
|
* prevent it from double-releasing nsHtml5StreamParser.
|
|
*/
|
|
class nsHtml5StreamListener : public nsIStreamListener,
|
|
public nsIThreadRetargetableStreamListener
|
|
{
|
|
public:
|
|
explicit nsHtml5StreamListener(nsHtml5StreamParser* aDelegate);
|
|
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
NS_DECL_NSIREQUESTOBSERVER
|
|
NS_DECL_NSISTREAMLISTENER
|
|
NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
|
|
|
|
inline nsHtml5StreamParser* GetDelegate()
|
|
{
|
|
return mDelegate;
|
|
}
|
|
|
|
void DropDelegate();
|
|
|
|
private:
|
|
virtual ~nsHtml5StreamListener();
|
|
|
|
nsHtml5RefPtr<nsHtml5StreamParser> mDelegate;
|
|
};
|
|
|
|
#endif // nsHtml5StreamListener_h
|