[Info-vax] QIO Writes to a mailbox

[JF Mezei]

Michael Moroney wrote:

> Not true, unless IO$M_NOW was specified on the write.  Otherwise, the 
> write QIO(W) won't complete until another process issues a read, and that
> could be a *significant* delay, if the reader was delayed.
> 


Are you sure of that for the mailbox driver ? You can do multiple writes
to a mailbox (even with QIOW which I what I have used for writes) before
the reading process collects the messages. This is why you declare a
buffer size when you create a mailbox.