Variable timeout method for improving missing-interrupt-handler

Details Variable timeout method for improving missing-interrupt-handler Variable timeout method for improving missing-interrupt-handler

1996-04-09

1999-04-13

Shin, Christopher B.

395878, 395733, 395739, 39518501, 39518301, 39518509, G06F 1100

Patent

active

058945830

ABSTRACT:
Missing interrupt handler (MIH) software features for supporting a variable MIH timeout for I/O requests issued by an operating system (OS). The MIH timeout is varied to prevent a false indication of a failure in an I/O device operation, which is indicated if the MIH timeout occurs. By extending the MIH timeout, the I/O device is given more time to complete its operation, and the extension is provided when the device control unit (CU), or the OS, determines an I/O operation cannot complete before the shortest available MIH timeout. The length of a primary MIH timeout period is extended to a secondary MIH timeout period in response to the OS detecting that an I/O request has a long command that requires a long operating time in the I/O device, or a signal from the device's CU indicating that the current operation in the I/O device is taking an excessive time without the device being in any error condition.

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