Comments (8)
这道题我也的确有疑问,但是老师有明确给出回复么?
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不需要老师给回复…spooling是把独占的设备变成共享的…这能是一回事吗
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emmmm好像百度出的答案是有spooling的:joy:
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没……现在我觉得答案是对的……
SPOOLing(Simultaneous Peripheral Operations On Line)的直译意思是“联机情况下同时进行的外围设备操作”,通常称其为“假脱机操作”。SPOOLing系统是虚拟设备最典型的代表,包括假脱机输入系统和假脱机输出系统两个部分,是对脱机输入/输出技术的改进。
脱机操作需要卫星以及操作员的来回走动并装卸磁带,假脱机操作则不需要卫星机以及操作员工作。假脱机操作时在中断系统和I/O通道的支持下,利用多道程序技术,完成了脱机操作的功能,故称作假脱机操作。它的基本工作原理是,使用一道程序管理通道,完成从低速的I/O设备输入数据到高速的磁盘上;使用另一道程序管理通道,完成将数据从高速的磁盘输出到低速的I/O设备上;同时,其他进程可进行数据处理。
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