I wish to take up the opportunity of GSoC for submitting a project. I
can work as tutor for it
mod_rivet can only work with non-threaded MPM (Multi-Processing Module).
An attempt to create a threaded module had been made by George Petasis
in 2012. George was able to rebuild mod_rivet using CMake on Windows and
for what I know he had some initial success, but I haven't heard any
news from him since then.
The project will be aimed at attain a prototype module supporting both
threaded and non threaded MPMs. For example when running with the
prefork MPM I wish mod_rivet to preserve the feature of fast cloning
running Tcl interpreters. On the other hand with a threaded MPM the
module should be able to start a thread pool and control it (as a
reference implementation I'm thinking of mod_perl, as George suggested
back in 2012)
Therefore by design the new module should be able to understand what
is the running MPM and fit into its architecture. This requirement is
also needed because, starting with Apache 2.4, the MPM is chosen at run-time
I envision a solution where MPM dependent code is stored in different
files building different binary libraries sharing the same API and
binary interface. They will be dlopened (using the Unix terminology) at
run time during module initialization so that their functions can be
transparently called by a new mod_rivet core module (much like Apache
HTTP server core calls its modules). The goals of the project would be
met if the developer can achieve a working module capable of running
basic Tcl scripts with both families of MPMs. On this prototype we can
develop the future of Rivet
The degree of difficulty is probably to be ranked as easy for a student
who is already familiar with threads.
Last but not least: having a GSoC student would be an opportunity to get
new people involved in Apache/Tcl.
-- Massimo
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