[MacRuby-devel] Threading Problems

[Jan Kassens]

I traced the bug down to a small script, but can’t get it smaller than this: http://pastie.textmate.org/private/m21wkng3mgu7wvksbu4rq
According to the apple documentation [1] the Calendar Store framework is thread safe, but removing it removes the seg faults and bus errors I’m getting. It might just be Obj C calls from threads?

If this is a bug, I can file a ticket, but I might as well be doing something stupid here.

[1]: http://developer.apple.com/mac/library/documentation/AppleApplications/Reference/CalendarStoreReference/index.html


Jan


On May 15, 2010, at 21:24, Laurent Sansonetti wrote:

> Hi Jan,
> 
> Indeed this looks like a classic threading problem. I thought we eliminated most of these in 0.6.
> 
> What does your #update method do specifically? Also, do the problems disappear if you call #update only once from the main thread before starting the thread?
> 
> A minor (but likely irrelevant here) note: I think your drawRect: method might be called from the thread, which is AFAIK not supported in Cocoa. 
> 
> Laurent
> 
> On May 15, 2010, at 8:25 AM, Jan Kassens wrote:
> 
>> Hi,
>> 
>> I’m writing a small widget application rendering a couple of NSView subclasses which update periodically.
>> 
>> The widgets are subclasses of [1] and added as subviews to my main view, but the more I add the more likely are some random errors thrown on initialization.
>> The errors include a variety of failed assertions and seg faults (see [2] for examples) and don’t yield any helpful clues. I’m guessing that I’m dealing with something not thread-safe here.
>> 
>> Am I doing something wrong here? I’m doing all the drawing inside the drawRect(rect) method (or synchronously called methods) which I don’t call manually. “update” pulls data from various resources, but doesn’t draw.
>> 
>> 
>> [1] WidgetView class: http://pastie.textmate.org/private/hwfozrwudk2lcwzker20q
>> [2] Different Errors: http://pastie.textmate.org/private/vbp7iuw11ig26zxegzg
>> 
>> Jan
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> 
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