HP 3000 Manuals HP 3000 Manuals
When to Use No-Wait I/O
You may want to use no-wait I/O with SNA IMF to do the following:
* Overlap processing on the host by using multiple SNA IMF devices.
* Respond to host or local (HP 3000) terminal interrupts
asynchronously.
You can overlap processing on the host during execution of one program on
the HP 3000 by using multiple HP devices. With no-wait I/O, the program
can issue a RECV3270 request for each device in use and then wait for the
first host response with IOWAIT.
You may want some of your applications to respond either to a host
interrupt or to a terminal local to the HP 3000. For example, when Pass
Thru, which uses SNA IMF intrinsics, issues a read to the HP terminal, it
follows the read with a call to RECV3270 and then a call to IOWAIT.
IOWAIT delays Pass Thru processing until either the RECV3270 or the
terminal read completes.