[Devel] Patch: Multithreading support for mysql module

[Henning Westerholt]

Hello,

the attached patch adds multithreading functionality based on the posix 
threads library to the mysql module. We're using this module (in an older 
version) with 0.9.5 to better support database failover scenarios. 
As the porting to current cvs demanded heavy adaptions, this code is rather 
untested now. This is probably not the right think to use in a production 
environment for now.. Any suggestions and bug reports are welcome!

This patch adds two new files for the threading functions to the mysql module 
and should cleanly apply to cvs head. It starts a master and a worker thread. 
If the worker hang due problems with the database, the master tries to 
restart the worker after a configurable timeout value. 
Compile with "EXTRA_DEBUG" to activate more locking checks and debugging 
output. You need a multithreading capable mysql library to use this patch, 
otherwise the module will not start.


By the way, I would like to introduce myself:

I work for the german internet service provider "1und1" as unix system 
developer. We're using OpenSER as mentioned before as part of our VoIP system 
for our customer since 0.9.X times. We have made many enchancements to this 
version, some bugfixes and modules to provides new functionality as well.

Now we would like to work more closely with the openser community, to help 
with testing, bugfixing and feature enchancements. I already submit some 
patches in the last weak, expect some more..

I'm linux user since 2000, and occasional contributor to many open source 
projects. I come from a C++/Java Background and have a good knowledge in 
system-/ network administration topics. As my experience with openser 
is limited at the moment, please bear with me if i ask sometimes obvious 
questions.

Thank you for the time for now - best regards,

Henning Westerholt
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