Re: why yield?

On POSIX system, I think the 'poll()' must do a 'pthread_testcancel()'
and should be ASYNC-SAFE, so perhaps the YIELD() is for non-POSIX
implementations.

William J. Mills wrote:
> 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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