B>_POSIX_THREAD_PROCESS_SHARED</B> in
pthread.h as -1 to indicate that these routines are implemented but
the process shared option is not supported.</P>
<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
<P>Upon successful completion, <B>pthread_mutexattr_setpshared</B>
shall return zero; otherwise, an error number shall be returned to
indicate the error. 
</P>
<P>Upon successful completion, <B>pthread_mutexattr_getpshared</B>
shall return zero and store the value of the <I>process-shared</I>
attribute