| 摘要 |
PURPOSE:To confirm the normal transition of a constitution state on a device without stopping access from CPU when the constitution state is transited by providing a conclusion status confirmation means for respective input/output instructions, repeatedly issuing an input/output instruction that does not cause the state transition of an adapter device from CPU, and issuing an input/output instruction that causes state transition from other CPU. CONSTITUTION:A processor module PM#1 having CPU issues the completion- type input/output instruction for the adapter device and it causes the adapter device to transit from an A state to a B state. PM#2 continues issuing the respective input/output instructions. PM#1 receives the conclusion status of the input/output instruction which itself issues and confirms the state transition of the adapter by a TADS instruction monitoring the constitution state of the adapter device. PM#2 confirms the state transition of the adapter by the change from the conclusion status for the A state to the conclusion status for the B state. |
