On May 6, 1:57 am, Martin Winkler <[EMAIL PROTECTED]> wrote: > Am Fri, 04 May 2007 21:06:52 -0700 > schrieb Mambaragi <[EMAIL PROTECTED]>: > > > Is there anything like Servlet Listener in django,python? > > not easily if you use mod_python, because for every apache thread a new > python instance is being generated.
Sorry, but that is wrong. A new Python instance IS NOT created for every Apache thread. It is true that there can be multiple Python sub interpreter instances, but for a particular application there will generally only ever be one, albeit where Apache uses multiple processes, there will be a sub interpreter instance for that application in each process. The important thing and where your statement is wrong, is that in a multithreaded Apache MPM, when concurrent requests arrive and are handled within the one Apache child process, those requests will be handled within separate threads, but the code being executed will be in the same sub interpreter instance. In other words, they would have access to the same data. At no time are multiple sub interpreters for an application created based on which Apache thread is executing. For further information read: http://www.dscpl.com.au/wiki/ModPython/Articles/TheProcessInterpreterModel I have heard these claims about new interpreters being created for each request and/or thread a number of times and I really don't quite understand why this myth keeps being propagated and why it nearly always seems to be associated with a corresponding comment saying why FastCGI is a better solution. :-( FWIW, starting up a daemon thread which runs for the lifetime of a process when mod_python is being used is possible. To do it, use the mod_python PythonImport directive to import a module at the time that the specific named sub interpreter your application is using is created and from that create a daemonised thread to do what you need. If some action needs to be done related to shutdown, then one can use apache.register_cleanup() to trigger an action when a process is being shutdown. Now hopefully this post will get through, as it appears that my recent posts to this list are disappearing into a void. :-( Graham --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
