Re: [boost] Re: Threads docs updated in CVS

From: duncan_at_[hidden]
Date: 2001-08-13 13:16:09

pdimov_at_[hidden] (Peter Dimov) wrote:

> synchronized_queue<int> q;
> event e;
> 
> void threadfunc()
> {
>   for(;;)
>   {
>     waitFor(e);
> 
>     while(!q.empty())
>     {
>        int m = q.pop();
>        if(m & 1) do_something_a();
>        if(m & 2) do_something_b();
>        if(m & 4) do_something_c();
>     }
>   }
> }
> 
> void notifyThread(bool a, bool b, bool c)
> {
>    q.push(a + 2 * b + 4 * c);
>    e.raise();
> }
> 
> Did I utterly miss the point? :-)

Surely notifyThread() can happen between end of while loop and before 
the waitFor(e) is entered again. In which case you have a lost wakeup.

--
Duncan Harris, Sapio Design Ltd, Manchester, U.K.