Method for specifying execution of only one of a pair of I/O com

Details Method for specifying execution of only one of a pair of I/O com Method for specifying execution of only one of a pair of I/O com

1996-03-15

1998-08-18

Shin, Christopher B.

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

Patent

active

057970343

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. In this method, an abort bit in each of the one and another I/O command blocks is set and an aborted bit is reset in each of the one and another I/O command blocks. Upon execution of the one and another I/O command blocks, in one embodiment, the execution of that I/O command block first initiating data transfer sets the aborted bit in the I/O command block pointed to by the offshoot block pointer in the I/O command block first initiating data transfer. After the aborted bit is set, the I/O command block is aborted at the next opportunity during execution of the I/O command block when the state of the aborted bit is checked.

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