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

[Johnny Billquist]

On 2015-08-28 19:06, Bob Koehler wrote:
> 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.

Yes, but now we talked about "checking", not "waiting". :-)

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

Indeed.

	Johnny