[webkit-dev] Issue with calling javascript function from a
external thread
Geoffrey Garen
ggaren at apple.com
Fri Aug 10 10:41:14 PDT 2007
WebKit is not thread-safe. If you want to perform external processing
on a secondary thread, that's OK, but any calls into the DOM will have
to happen on the main thread.
Geoff
On Aug 10, 2007, at 3:00 AM, Julien Chaffraix wrote:
> Hi all,
>
> I am trying to make a wrapper in C++ for the Ivy protocol for OWB (I
> think it could work on Webkit even though I have not tested) that
> could world entirely in javascript. Ivy is a light-weigh publish/
> subscribe protocol. It is based on callback functions that you call
> when a regExp is seen on the bus.
>
> My main problem is that the thread that calls back functions is the
> thread that handles incoming transmissions, that is not one of
> Webkit threads.
>
> As my problem seems close to what is done in XMLHttpRequest, I have
> tried mecanisms used by that class and particularly reusing the code
> from JSAbstractEventListener::handleEvent to call my object. The
> callback seems to work but developing a javascript application on
> top of that lead me to discover that some part of javascript are not
> working : for example, accessing some (not all) element with
> document.getElementById("...") does return "null" in the callback
> (but works in the Webkit threads) even though I could access it
> directly in C++ through Document::getElementById.
>
> I do not know much about what I have done wrong but I am eager to do
> the necessary debugging and testing.
>
> Maybe also my method is not the best so if someone has a better
> idea, he is more than welcome.
>
> Thanks,
>
> Julien
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