On Fri, 13 Dec 2002, Aaron Bannert wrote: > > On Thursday, December 12, 2002, at 12:34 PM, Greg Ames wrote: > > I dug into APR locks a little bit. The apr_global_mutex_* functions > > turn into two separate syscalls, with #if APR_HAS_THREADS around the > > thread mutexing. So unfortunately they wouldn't save us any syscalls > > :-( :-( But they might save a little bit of function call overhead. > > > > Another interesting place to look is in > > srclib/apr/include/arch/unix/apr_private.h . > > There are several xxxx_IS_GLOBAL symbols for various serialization > > mechanisms. On my Linux box, all of them are #undef'ed and commented > > out, including fcntl and flock which are the two choices for > > apr_file_lock. Madhu, could you take a look there and see what you've > > got? > > You really shouldn't use those xxxx_IS_GLOBAL symbols for anything > outside of APR. > They are there for platforms like s390 where some of the file-based > locks do actually > serialize multiple threads within multiple processes.
Um, then why in the world are those symbols in a public header file? They are only ever used inside of APR, so they should exist in apr_private.h, not apr.h. Ryan
