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https://issues.apache.org/jira/browse/MODPYTHON-202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494242
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Graham Dumpleton commented on MODPYTHON-202:
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mod_python should perhaps simply be using 'ap_accept_lock_mech' instead of
'APR_LOCK_DEFAULT'.
The value of 'ap_accept_lock_mech' is more likely by default to be correct for
what type of MPM is being used, if not, it can be overridden using the existing
AcceptMutex directive, which if 'APR_LOCK_DEFAULT' is wrong for the MPM being
used would have to be done to get the MPM to work anyway.
> Allow mechanism used by global mutex locks to be specified.
> -----------------------------------------------------------
>
> Key: MODPYTHON-202
> URL: https://issues.apache.org/jira/browse/MODPYTHON-202
> Project: mod_python
> Issue Type: New Feature
> Components: core
> Affects Versions: 3.2.10
> Reporter: Graham Dumpleton
>
> When using experimental Apache ITK MPM, described at:
> http://home.samfundet.no/~sesse/mpm-itk/
> global mutex locks will fail if Apache used semaphores because requests
> against different virtual hosts run as different users and user will not have
> permission to access the semaphore to lock it. See:
> http://www.modpython.org/pipermail/mod_python/2006-November/022536.html
> for original mailing list post about this from Sam Morris.
> A suggested fix of finding a specific mechanism that works rather than
> default used by Apache, seems to work:
> http://www.modpython.org/pipermail/mod_python/2006-November/022537.html
> http://www.modpython.org/pipermail/mod_python/2006-November/022538.html
> http://www.modpython.org/pipermail/mod_python/2006-November/022539.html
> If available MPMs with such constraints are going to appear, may make sense
> to have an option to configure which allows one to override at compile time
> the default mechanism used for global mutex locks so that it can be made to
> match what may be required for a specific MPM that Apache is compiled to use.
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