On Wed, 30 Jun 2021 04:29:56 GMT, Sergey Bylokhov <s...@openjdk.org> wrote:

>> At this point if we exit, we just return and unlock MTLRenderQueue for 
>> backbuffer rendering. And when it is done we again start CVDisplayLink in 
>> MTLRenderQueue which in turn calls setNeedsDisplay to get callback to 
>> MTLLayer.display().
>> 
>> This scenario is same as returning from CGLLayer.blitTexture() when 
>> textureID is 0. Appkit thread will be running in the background and we dont 
>> stop it.
>
> No, I meant if we dispose the frame/exist from the app/etc before 
> "Java_sun_java2d_metal_MTLLayer_blitTexture" method is executed but after we 
> call "startDisplayLink", when we will call the stopDisplayLink in this case?

In that case it will hit MTLLayer.dealloc() where we stop and release 
CVDisplayLink.

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PR: https://git.openjdk.java.net/jdk17/pull/175

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