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From Brian Pane <brian.p...@cnet.com>
Subject Re: [PATCH] apr_atomic.h on Linux
Date Thu, 18 Apr 2002 15:38:31 GMT
Joe Orton wrote:

>There are issues with use of asm/atomic.h on Linux: according to the
>kernel gurus here this is a header for internal use of the kernel,
>and shouldn't be used from userspace.
>The problems are, if I understand them correctly:
>- with newer kernel/glibc combinations (e.g the RHL7.3 beta) this stuff
>really isn't exported to userspace, so they can't be used at all. (this
>is the most serious problem, it prevents APR from building)

Thanks for reporting this.  I agree that we need to stop relying on
asm/atomic.h on Linux.

My only objection to the patch is that it solves the problem by switching
to the mutex-based default implementation on Linux--which defeats the whole
point of the API on one of our most important platforms.  I suppose we can
fix that by using inline assembly to generate the atomic operations for the
Linux+gcc+x86 case.


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