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UIGraphicsBeginImageContext thread safety

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UIGraphicsBeginImageContext thread safety

Subject: UIGraphicsBeginImageContext thread safety
From: Andrew <email@hidden>
Date: Fri, 2 Oct 2009 00:41:03 +1300

Hi All,

So clearly the UIGraphicsBeginImageContext() set of calls are not thread safe, I was attempting to use them in an NSOperation and they are causing a crash, further research has shown me that I need to drop down into the CG calls to do what I want to do.

.....and presumably I could have been forewarned if I had looked at the 'UI' at the front of the function, and had read that as a Sign.

I am, however, very interested...for my own curiosity...in why they are not? my mental image of that call had it simply wrapping the CGBitmapContextCreate() set of calls, and they are thread safe.


what is it doing that renders it not thread safe, does anyone know?


Yours cheerfully,

Andrew Bush

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