I/O command block chain structure in a memory

Details I/O command block chain structure in a memory I/O command block chain structure in a memory

1996-03-15

1998-09-22

Shin, Christopher B.

395827, 395826, 395841, 395852, 395879, G06F 1314

Patent

active

058128778

ABSTRACT:
An I/O command block, that is stored in a memory, includes information for connecting the I/O command block to other I/O command blocks in a chain structure. Each I/O command block structure in the chain includes a chain control field, a next block pointer, and an offshoot block pointer. The chain control field includes a hold-off field, a concurrent field, an abort field, an aborted field and a progress counter. Upon the hold-off flag having the first state, execution of the I/O command block structure is inhibited. Upon the hold-off flag having the second state, execution of the I/O command block structure is enabled. The concurrent field defines a string of I/O command blocks that are enabled simultaneously for execution. The abort and aborted fields are used to allow one I/O command block to terminate another I/O command block. The progress counter determines when to enable an I/O command block, that is not an offshoot command block, for execution.

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