[jira] Commented: (MODPYTHON-202) Allow mechanism used by global mutex locks to be specified.

["Graham Dumpleton (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MODPYTHON-202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494242 ] 

Graham Dumpleton commented on MODPYTHON-202:
--------------------------------------------

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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