Re: Thread safe?

FROM : Thomas Engelmeier
DATE : Sun Mar 30 15:10:41 2008

On 29.03.2008, at 18:54, Adam R. Maxwell wrote:
>
> Drawing into an NSImage is explicitly documented to be thread safe 
> in the article you linked to, and each thread has its own graphics 
> context.  The post I linked to does indicate that you might want to 
> use [image setCacheMode:NSImageCacheNever].  If your goal is just to 
> get an NSBitmapImageRep from a file, it's probably easier just to 
> use +imageRepWithContentsOfFile:.


While it is documented to be thread save you might get crashes later 
when an NSBitmapImageRep created by drawing into from an secondary 
thread gets drawn itself. The crash occurs when the image tries to 
access an NULL (offscreen) window context (it probably was originally 
drawn into).

Tried to debug that on 10.5.2 (and simply worked around)...

Regards,
   Tom_E