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Graham Dumpleton
grahamd at dscpl.com.au
Wed Nov 8 17:43:28 EST 2006
Graham Dumpleton wrote .. > Sam Morris wrote .. > > 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. > > Good to hear it works. > > At this stage the best course of action is probably to create an issue > on the > mod_python bug tracker with the suggested new feature of an option to configure > which allows the locking scheme used for the global locks to be overridden > at > compile time. As well as the changes to configure, obviously need to make > code > changes in src/mod_python.c and elsewhere. > > Note that because of where we are at with releases this would not be looked > at > until some future release after 3.3. Thus, for the time being at least, > just go with > the manual change. > > I'll create an issue in the bug tracking system later when I get a chance > and after > I have done some research on what this experimental MPM is all about. For future reference, have created issue tracker item: http://issues.apache.org/jira/browse/MODPYTHON-202 If you ever come up with any problems with the solution or other gotchas, best to add it against the bug tracker issue. Graham
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