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From "Sam Morris (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MODPYTHON-202) Allow mechanism used by global mutex locks to be specified.
Date Sun, 18 Mar 2007 14:12:09 GMT

    [ https://issues.apache.org/jira/browse/MODPYTHON-202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12481939

Sam Morris commented on MODPYTHON-202:

I did some investigating today and it seems that a pthread_mutexattr_setrobust_np function
was introduced in glibc 2.4, so mod_python could check for it at build time.

My platform (Debian) will stick with glibc 3.2 until the release of Debian 4.0 ("etch"), so
I'm inclined to add a PythonOption for this 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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