Graham Dumpleton commented on MODPYTHON-202:

A configuration option can possibly be modelled off how the AcceptMutex 
directive for Apache works. Ie:


Would just need to decide whether we do it as a PythonOption or introduce a new 
directive instead.

Note there is an interesting comment in there about using pthread which may be 
relevant to the problem you are seeing. Specifically:

  On most systems, when the pthread option is selected, if a child process 
  abnormally while holding the AcceptCntl mutex the server will stop responding 
  requests. When this occurs, the server will require a manual restart to 

  Solaris is a notable exception as it provides a mechanism, used by Apache, 
  usually allows the mutex to be recovered after a child process terminates 
  while holding a mutex.

  If your system implements the pthread_mutexattr_setrobust_np() function, you 
  be able to use the pthread option safely.

> Allow mechanism used by global mutex locks to be specified.
> -----------------------------------------------------------
>                 Key: MODPYTHON-202
>                 URL: http://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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