[boost] Re: Moving Boost.Thread barrier from thread_devto HEAD

From: Matthew Vogt (mvogt_at_[hidden])
Date: 2004-02-18 18:57:13

Michael Glassford <glassfordm <at> hotmail.com> writes:

> > Actually, to get enough threads to reenter barrier while some threads are
> > still inside, you need fresh threads on the next barrier. IOW, threads A, B
> > and C wait on barrier. A gets through and spawns B' and C'. Then A, B' and
> > C' wait on barrier, get though, and leave B and C stuck on condition wait
> > forever.
> 
> True, I realize that. Or you could simply create a barrier that blocks 
> until it reaches, say, 5 threads and then send 10 threads through it. In 
> a worst case scenario, 4 of the first 5 threads to wait on the barrier 
> could get stuck there permanently.
> 

Is it possible to create a barrier that waits for a set of threads before
permitting them to continue, rather than a count of threads?  Perhaps a
thread_group is a safer layer at which to implement a barrier...

Matt

(Adding extra lines at the end to make gmane let this through...)