Method for sequencing execution of I/O command blocks in a chain

Details Method for sequencing execution of I/O command blocks in a chain Method for sequencing execution of I/O command blocks in a chain

1996-03-15

1999-07-13

Lee, Thomas C.

395844, G06F 930

Patent

active

059238968

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. The I/O command block chain structure allows simultaneity of execution, provides a mechanism to inhibit and enable execution of an individual I/O command block, and a mechanism for establishing precedence in the sequence of execution of the I/O command blocks. This level of capability is provided by only information in the I/O command blocks within the chain. To make a chain, a chain control field, a next block pointer, and an offshoot block pointer are configured in each I/O command block in the chain. The process of making a chain is a method for specifying a sequence of execution of a chain of I/O command blocks stored in a memory and execution of each I/O command block using only information in the chain of I/O command blocks, because as explained above the chain controls the sequence and precedence of execution of the I/O command blocks in the chain.

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