write lock attributes object.
Once initialized, the lock can be used any number of times without
being reinitialized. Results are undefined if <B>pthread_rwlock_init</B>
is called specifying an already initialized read-write lock. Results
are undefined if a read-write lock is used without first being
initialized. 
</P>
<P>If the <B>pthread_rwlock_init</B> function fails, <I>rwlock</I>
shall not be initialized and the contents of <I>rwlock</I> are
undefined. 
</P>
<P><B>PThreads4W</B> supports statically ini