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Sam Morris
sam at robots.org.uk
Wed Nov 8 06:11:18 EST 2006
On Tue, 07 Nov 2006 18:46:44 -0500, Graham Dumpleton wrote: > Looking at: > > http://apr.apache.org/docs/apr/apr__global__mutex_8h-source.html > > you might consider changing mod_python code such that instead of > passing APR_LOCK_DEFAULT to the call of apr_global_mutex_create() in > src/mod_python.c, change it some some other specific locking > mechanism rather than relying on APR to choose one for you. Thanks very much for the pointers! My results: APR_LOCK_FCNTL: works! APR_LOCK_FLOCK: works! APR_LOCK_SYSVSEM: fail (permission denied when acquiring semaphore) APR_LOCK_POSIXSEM: fail (not implemented on my platform) APR_LOCK_PROC_PTHREAD: works! (On my platform, Debian GNU/Linux, APR_LOCK_DEFAULT causes SysV Semaphores to be used). Out of these, I guess pthread semaphores are the fastest. Would you consider adding an option to mod_python's Apache configuration to control which semaphore implementation is chosen? I can try to come up with a patch for this. -- Sam Morris http://robots.org.uk/ PGP key id 1024D/5EA01078 3412 EA18 1277 354B 991B C869 B219 7FDB 5EA0 1078
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