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From "Boyle Owen" <>
Subject RE: [users@httpd] Help understanding DSO
Date Fri, 06 Dec 2002 16:57:06 GMT
>-----Original Message-----
>From: []
>1. When you load a module using the LoadModule directive is it 
>loaded as another process?

A module is an additional chunk of compiled code which is loaded into
memory along with the main httpd binary. It is like pasting a subroutine
onto the bottom of your program  - it is thereafter available if you
want to use it. The module doesn't run as a separate process - it
becomes a part of the main binary in memory.

A side-effect of this are that if there are any bugs in the module, the
main program will crash as well when those bugs are hit.

There are two ways to use a module:

- load it at runtime (dynamic shared object)
- compile it in permanently at compilation (static build).

DSO is good for developing (you can easily switch out a faulty module)
and if you want to be parsimonious with memory while a static build is
simpler for management and portability.


Owen Boyle

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