[Cbc] Threadsafe usage of Cbc

[John Forrest]

Cornelius,

It would be more work to enable CBC_THREAD_SAFE by default as the 
standalone solver normally can read commands from stdin and environment 
variables.  CBC_THREAD_SAFE switches that ability off.  To make Cbc 
threadsafe out of box AND still allow parsing commands would be boring 
work - maybe a week.

I never plan - especially releases and I never fiddle too much with 
configuration.  So until next release you could just use svn and then no 
patches are needed - just svn checkout ...../2.8 and add

-DCBC_THREAD_SAFE -DCBC_NO_INTERRUPT

to configure.

John
> Great,
> that exactly what I needed!
> My preliminary tests show that cbc works as intended :-)
> When do you plan to make a new 2.8 release?
> And could you either include a configure option for thread safety, or, even better, just enable CBC_THREAD_SAFE by default?
> Or do you need more testing for that?
> Ideally, we'd like to use our framework without any patches, and I think that would be the easiest if cbc was threadsafe out of the box.
>