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To: dev@apr.apache.org
From: Brian Ferris <bdferris@cs.washington.edu>
Subject: apr_thread_rwlock + PTHREAD_RWLOCK_INITIALIZER + Mac OS X
Date: Sun, 20 Feb 2005 14:58:16 -0800

I've been developing with the APR on Mac OS X 10.3.8, and I'm 
specifically looking at the apr_thread_rwlock functionality.  It's my 
understanding that Mac OS X has not supported rwlocks in the past, but 
that may have changed.  There is mention Specifically, my experiments 
with pthread_rwlock methods suggest the functionality is working.  
However, rwlock support fails to build in apr-1.1.0 because of the 
following check in the configure script:

[pthread_rwlock_t rwlock=PTHREAD_RWLOCK_INITIALIZER;]

The PTHREAD_RWLOCK_INITIALIZER macro is missing, which prevents the 
unix rwlock implementation from kicking in.  Changing it to something 
like:

[pthread_rwlock_t rwlock; pthread_rwlock_init( &rwlock, NULL);]

does the trick and more closely mirrors the code in 
locks/unix/thread_rwlock.c  Additionally, all the test-cases for 
rwlock's pass on Mac OS X 10.3.8 for me.  Any thoughts on this issue?  
I apologize if this is not the appropriate venue.  I'm new to the list 
and I was not able to find any archives to see if this issue had been 
discussed before.

Thanks,
Brian Ferris