Parameters

HDR=

Specifies the address of a fullword queue header.

BLK=

Specifies the register in which the address of the dequeued block is returned after the macro completes processing. If the queue is empty, zero is returned.

PTR=

Specifies the field name in the DSECT which represents the chain field for blocks on this queue.

REF=

Specifies the name of the DSECT used to describe blocks on this queue.

EMPTY=

Specifies the address to return to when the queue is empty.