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1. 发明公开

EP2174227A1 RESERVED DEVICE ACCESS CONTENTION REDUCTION 有权
标题翻译：保留的设备访问权限降低
公开(公告)号：EP2174227A1
公开(公告)日：2010-04-14
申请号：EP09711029.0
申请日：2009-02-09
申请人： International Business Machines Corporation
发明人： CASPER, Daniel , BENDYK, Mark , HATHORN, Roger , FLANAGAN, John , HARDY, Clint , HUANG, Catherine , KALOS, Matthew , RICCI, Louis , SITTMANN III, Gustav , YUDENFRIEND, Harry
IPC分类号： G06F13/14
CPC分类号： G06F13/122 , G06F9/50
摘要： A computer program product, an apparatus, and a method for reducing reserved device access contention at a control unit in communication with a plurality of operating systems via one or more channels are provided. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method that includes receiving a command message at the control unit from a first operating system, including an I/O operation command for a device. A device busy indicator is received, indicating that a second operating system has reserved the device. The command message is queued on a device busy queue in response to the device busy indicator. The control unit monitors for a device end indicator. The device busy queue is serviced to perform the I/O operation command in response to the device end indicator.
摘要翻译：提供了一种用于减少在经由一个或多个通道与多个操作系统进行通信的控制单元处的预留设备访问争用的计算机程序产品，装置和方法。该计算机程序产品包括可由处理电路读取的有形存储介质，并存储由处理电路执行的用于执行一种方法的指令，该方法包括：在控制单元处从第一操作系统接收命令消息，该消息包括I / O操作命令为设备。接收到设备忙指示符，指示第二个操作系统已预留该设备。响应于设备繁忙指示符，命令消息在设备繁忙队列中排队。控制单元监视设备结束指示符。设备繁忙队列被服务以执行I / O操作命令以响应设备结束指示符。

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