I/O command block chain structure in a memory

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