前台任务 meaning in English

foreground task

To complete a task properly , threads were used to realize both downstage and backstage duties commonly , so the communications among threads were demanded widely
为恰当地完成任务，往往以线程来实现前台任务及后台任务，从而线程间的通信就是广泛的要求了。
The system software uses typical foreground / background model . the main program serves as background and interrupts " isrs serve as foreground . system program responses all measuring , controlling , communicating and displaying tasks in time through switching between foreground and background and queuing tasks in terms of priority level
在软件组织上，采用典型的前后台模式，以主程序作为后台任务，中断服务程序作为前台任务，通过对前后台任务的及时切换以及对前台任务进行优先级排序，达到及时响应系统测量、控制、显示等一系列任务。