Metal renderer threading issues [macOS]

[Alan Bateman]

On 07/10/2023 13:59, Alan Snyder wrote:
> I’ve been investigating a problem with a long running application that 
> accumulates an apparently unbounded number of
> CVDisplayLink threads. I do not yet have an explanation or a test case.
>
> The code that creates and releases CVDisplayLinks looks fine, but that 
> assumes there are no threading issues.
> It looks like there are threading issues.
>
> Specifically, it appears that the startDisplayLink and stopDisplayLink 
> methods of the Objective-C class MTLLayer are invoked on multiple threads.
>
> They are invoked on the AppKit main thread from screen sleep 
> notifications and blitTexture.
>
> They are invoked on the EDT from MTLLayer.validate.
>
> They are invoked on the Queue Flusher thread 
> from MTLRenderQueue.flushBuffer.
>
> Perhaps someone familiar with this code could comment?
>
It would be better to being this to client-lib-dev as that is where the 
metal pipeline is maintained.

-Alan
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