[Info-vax] QIO Writes to a mailbox

[Jim Duff]

On 5/11/2011 2:53 PM, JF Mezei wrote:
> Michael Moroney wrote:
> 
>> Not checking the status is almost certainly the cause of the problem.
> 
> 
> I disagree. It is not the *cause* of the problem. It merely means that
> the aplication won't detect a problem and attempt to correct it.
> 
> [snip]
> Since a write to a mailbox is nearly instantaneous if here is sufficient
> buffer space to add the new message, the use of QIO or QIOW doesn't make
> much of a difference from a timing point of view. They either work right
> away or cause the process to get hung in RWMBX until someone reads from
> the mailbox.

Remind me not to hire you as a programmer, as QIO vs QIOW sure does make
a difference.

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