Specifications

Completing an I/O Request and Handling Timeouts
8.2 Timeout Handling Routines
g. Issues a SETIPL macro to raise IPL$_POWER and prevent power failure
interrupts on the local processor.
h. Invokes the WFIKPCH macro to wait for another interrupt or timeout.
When the OPCOM process reads the message in its mailbox, it sends the
requested message, in this case ‘‘device-offline,’’ to all operator terminals enabled
for that device class.
8–7