andler.
<P>
The Linux and Irix implementations use
only documented Pthreads calls, but rely on extensions to their semantics.
The Linux implementation <TT>linux_threads.c</tt> relies on only very
mild extensions to the pthreads semantics, and already supports a large number
of other Unix-like pthreads implementations.  Our goal is to make this the
only pthread support in the collector.
<P>
(The Irix implementation is separate only for historical reasons and should
clearly be merged.  The current Solaris imp