Sorry about posting to the wrong list. In my case, I really do need
multiple threads due to the interaction between the widget plugin and
the widget's WebView, so I set up some notification-passing to do the
WebKit API calls from the main thread. Not only is it working, but I
now know more about threads as a result of your response. Thanks very
much!
Ben
--
Ben Kazez
http://www.benkazez.com
On Jul 10, 2005, at 9:09 PM, Timothy Hatcher wrote:
First I would like to point out this mailing list if for
discussions about WebKit internal development. There is webkitsdk-
[EMAIL PROTECTED] for discussions about development of
applications/widgets using WebKit. You might have more exposure there.
Simply locking around WebKit's WebView wont solve this problem. The
reason is you don't know what other Cocoa classes or System APIs
WebKit uses that aren't thread safe. Most Cocoa classes are
publicly listed as not thread safe.
There is a list of thread safe classes and other information here:
http://developer.apple.com/documentation/Cocoa/Conceptual/
Multithreading/articles/CocoaSafety.html
You might want to rethink your design, calling WebKit from only the
main thread. This will save you many headaches. Most of WebKit's
API is non-blocking and callback/delegate based, so threads really
aren't needed.
— Timothy Hatcher » colloquy.info
On Jul 10, 2005, at 7:51 PM, Ben Kazez wrote:
In fact, I am calling WebKit APIs from multiple threads, which
wasn't a good idea on my part. This is my first experience with
multiple threads, and I'm enjoying it but am still quite a novice.
My only WebKit call is to [WebView -
stringByEvaluatingJavaScriptFromString:], so I've changed it to
[_webViewLock lock];
[_webView
stringByEvaluatingJavaScriptFromString:endHandlerJavaScript];
[_webViewLock unlock];
where _webViewLock is an instance variable in the Dashboard plugin
object. However, the crash still happens -- some elements too
tall, others too short, elements disappearing until you mouse over
them, and then EXC_BAD_ACCESS. Should my locking code above have
worked? (I can move this discussion to Cocoa-dev if it becomes off-
topic for this list.)
Thank you very much for your help.
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