| 摘要 |
<p>PURPOSE:To suppress the alteration of the display priority order of new data or previously displayed data by providing a first control table that controls mutual display priority order and a second control table that controls priority window declaration related to data of the highest priority out of plural data being displayed and queue requesting display. CONSTITUTION:A task displaying the front display data is enabled to issue priority window declaration, and when the priority window declaration is made, it is set to the second control table. When another task makes request for display anew, or priority of display of data being displayed is changed, priority window declaration of the second control table is checked. Thereby, it is made to the state of waiting in the queue requesting display of the second control table, and these request for display or request for changing display is suppressed. Accordingly, an operator and task which are renewing the front display data can proceed processing without interfered by other data display task, and he can make operation just like he has sole possession of the display picture.</p> |
