[Info-vax] Volatile, was: Re: yet another sys$qiow question

[Bob Koehler]

In article <mrprkt$utq$2 at Iltempo.Update.UU.SE>, Johnny Billquist <bqt at softjar.se> writes:
> 
> Checking the event flags is no more valid than checking the IOSB, and is 
> way costlier.

   Yes, but you can wait on various combinations of event flags, which
   can be extreemly cheap compared to a CPU bound loop.

   There's no wait to wait on an IOSB.

   And if you add a something like a timed delay in your loop, you
   are waiting on an event flag.