Re: [boost] [thread] condition suffering from lost wakup bug?

From: Matt Hurd (matt.hurd_at_[hidden])
Date: 2005-09-15 01:48:23

> On 15/09/05, Roland Schwarz <roland.schwarz_at_[hidden]> wrote:
> Matt Hurd schrieb:
> 
> >>    { // we wait until all threads are up
> >>        lock_type lock(guard);
> >>        while (global_number_of_threads <
> >>            number_of_threads_for_test+1)
> >>            cond.wait(lock);
> >>    }
> >>
> >>
> >
> >I can't see why you get here?  I might be missing something but you're
> >likely to end up with all threads waiting on conditions here...
> >
> This is intentionally, since I need to create a "thundering herd here".

Sorry I wasn't clear.  I didn't get to looking at the thundering herd
bit in detail as according to me, my debugger agrees too, your main
thread is locked waiting before this loop.

That is, I don't get out of this loop:

> >>    { // we wait until all threads are up
> >>        lock_type lock(guard);
> >>        while (global_number_of_threads <
> >>            number_of_threads_for_test+1)
> >>            cond.wait(lock);
> >>    }

Which is what I was trying to explain but did a rather poor job.

matt.