Method for executing I/O request by I/O processor after receiving trapped memory address directed to I/O device from all processors concurrently executing same program
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United States of America Patent
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Mar 25, 1997
Issued Date -
N/A
app pub date -
Oct 2, 1995
filing date -
Dec 1, 1993
priority date (Note) -
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Abstract
The effects of I/O race conditions caused by asynchrony between processors concurrently executing the same software and I/O devices are eliminated by executing an application program and a first associated operating system with firs processors, and executing an I/O processing program and a second associated operating system with an I/O processor. Memory requests from the application program or the first associated operating system are processed with the first processors, and memory requests from the application program to memory addresses associated with I/O devices are trapped and transmitted to the I/O processor. The I/O processor then performs the trapped memory requests with the I/O processing program after waiting for the identical request to be received from each of the first processors to eliminate the effects of race conditions caused by asynchrony between processors concurrently executing the application program or the first associated operating system and I/O devices. I/O requests may be trapped and performed by the I/O processor for the same purpose.
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