Hi Joe,
From what I remembered and understood, actions like FrameLoader::stopAllLoaders
is not safe to be executed in a nested event loop. I would try to find a way to
exit all nested event loops first and then close the page if it has to be done
gracefully.
In EventLoopBlackBerry.cpp, the loop’s end flag is set when the thread’s
isRunning() method returns false.
m_ended = !BlackBerry::Platform::webKitThreadMessageClient()->isRunning();
It could be something like:
m_ended = !BlackBerry::Platform::webKitThreadMessageClient()->isRunning() ||
...->shouldExitNestedEventLoop();
-yong
From: Joe Mason
Sent: Monday, April 22, 2013 11:37 AM
To: [email protected]
Cc: Mike Lattanzio, Mike Fenton
I'm trying to debug a deadlock on exit in a BlackBerry app that uses webkit
(which is pretty hard to reproduce, so I don't have a cut-down test case yet).
Right now my suspicions are on this behaviour:
a synchronous XMLHttpRequest starts loading (from a script running in the main
frame)
ResourceHandle::platformLoadResourceSynchronously gets called
On BlackBerry, this is implemented by creating a nested EventLoop and calling
loop.cycle()
While in the nested event loop, BlackBerry::WebPage::stopLoading is called
This is implemented by calling m_mainFrame->loader()->stopAllLoaders()
As far as I can see, FrameLoader::stopAllLoaders does NOT stop any
XMLHttpRequest started from this frame - it just stops the
provisionalDocumentLoader and documentLoader for the frame itself, and
recursively does the same for all subframes. Is that correct?
Is there a way to find and stop all synchronous requests associated with a
frame? (There should be only one...)
Thanks,
Joe
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