Re: why yield?

I think it has to do with forcing a yield to the other threads in the
case that the poll grabs the CPU.  Not sure though what the specific
cases are where we needed this.  Might be a holdover from previous
thread/race debuggig or it might be current and needed.

-bill



On Mon, Oct 21, 2002 at 10:53:12AM -0400, Chris Hanson wrote:
> I am puzzled by the YIELD() in the code below from tcp_bp_listen().
> (I've edited the code below to remove the win32 conditionalizations.)
> Can someone explain why there's any reason to YIELD() here?  It seems
> to me that the program simply loops back to poll(), which will block
> if there isn't any input.
> 
> ----------------------------------------
>     do {
>         int	msecs = 5;
> 
>         if (poll(ready, 1, msecs) <= 0)
>         {
>             if (TERMINATE) {
>                 return NULL;
>             }
>             YIELD();
>             continue;
>         }
> ----------------------------------------
> 
> 
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