Re: Proposal for a userspace "architecture portability" library

[Dan Kegel]

Roland McGrath <roland () redhat ! com> wrote:
>> I don't think glibc exports any atomic operations.
>
>That is true.  But it does have implementations in bits/atomic.h for many
>processors, and that is under the LGPL.

Interesting.  This seems to be new as of glibc-2.3.3.
(glibc-2.3.2 had implementations of all sorts of things,
spinlocks even, but they were all internal.)

gcc's libstdc++ also exports an atomicity.h
(in e.g. /usr/include/c++/3.4.2/bits/atomicity.h).

gcc's libjava also has its own set of lock primitives
(buried in a file named locks.h).

It would be quite the engineering feat to demonstrate
a gcc/glibc toolchain actually using your proposed
portability layer and demonstrate zero loss of performance.
Even that might not be enough to convince the glibc
maintainer to use it...
- Dan

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