Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers

Wed, 09 Mar 2016 03:41:49 -0800 

* Szabolcs Nagy <[email protected]> [2016-03-09 12:34:50 +0100]:
> * Ingo Molnar <[email protected]> [2016-03-09 09:56:31 +0100]:
> > Why is so much complexity added to avoid a ~3 instructions window where 
> > calcellation is tested? Cancellation at work atom boundaries is a 
> > fundamentally 
> > 'polling' model anyway, and signal delivery is asynchronous, with a 
> > fundamental 
> > IPI delay if it's cross-CPU.
> > 
> 
> to avoid the race when the thread is cancelled after the test but before
> the syscall see http://ewontfix.com/16/
> 
wrong link
http://ewontfix.com/2/

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