Re: [Boost-users] Thread events

From: Roland Schwarz (roland.schwarz_at_[hidden])
Date: 2005-09-09 10:32:12

Johan 't Hart schrieb:

>Thanks for your replies.
>
>To me boost::condition looks very much like the old event variable, except
>that it works together with a mutex. I am now wondering why you should lock
>a mutex before waiting for the condition? Is there a rationale about this?
>
>  
>
I recommend getting a book on pthreads (Posix Threads). E.g. 
"Programming with
POSIX Threads" David. R. Butenhof.

You will understand then why the sole combination of mutex and condition 
valiables
will solve (almost) every MT need.
I said almost because there is on some platforms (Win32) an inherent 
inability to cancel out
of blocking IO calls. However the clever guys that ported pthreads to 
Win32 solved
a lot of these problems.

You might also look into my thread_alert submission which is in the 
boost file vault.
It does address this later issue to some degree.

Regards,
Roland