[Insight-developers] RE: SGI builds and libCio.a

[Brad King]

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> No. Multiprocessor sgi. Any test that had I/O would crash.
> Multiprocessor suns work fine. Don't change anything that will affect
> them please.
> > The original problem can from a multiprocessor Sun didn't it?

I think the problem was originally on a multiprocessor Sun, and was solved
by adding -D_PTHREADS.  Adding that caused ANY sgi machine to crash when
doing I/O with the ansi std library.

I've attached what I think is the last version of the small test program
Jim Miller and I used to recreate the problem on the multiprocessor sun.
If it wasn't the last version, Jim has a slightly more recent one
somewhere.

Build it with

  CC thread1.cxx -lthread

(or maybe with gcc?) and run it with the number of threads as the first
command line argument.  If it is built with -D_PTHREADS defined, it works
fine.  Otherwise, it fails almost immediately.  Once you have duplicated
this behavior on the sun, try it on the SGI.  I bet it will work fine.
The default SGI STL behavior is to use SPROC (SGI's native spin-locks) for
thread safety.

I think the solution is to remove the SGI std library and define _PTHREADS
only on the Sun.

-Brad

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