On Wed, Apr 3, 2013 at 3:03 PM, Greg Lazar <greglazar@hotmail.com> wrote:
The apr_file_lock routine, in the version of apr runtime library that I've currently built uses fnctl which does not appear to be thread safe. I need to use the worker MPM, so is it recommended that I build the apr runtime library to use flock instead. NFS file systems aren't a concern in this case. I didn't know how extensively the apr_file_lock was used through the rest of apache and if I'd be introducing any regressions by switching the apr runtime library to use flock.

I'm not aware of any apr_file_lock() use within httpd, so you wouldn't regress anything (unless you're using third-party modules that use apr_file_lock).  But I guess you've introduced a third-party module that uses apr_file_lock() or you wouldn't be asking about this?

I guess the apr_file_lock() use of fcntl() needs to get a thread mutex too.

What OS is this?

Born in Roswell... married an alien...