Patent ID: 6928492

Claim:
An access method comprising the steps of: requesting, by a process, an open procedure of an I/O device or an I/O interface to an operating system; allocating, by the operating system, a context identifier for indicating a request storing area of the process; mapping a memory page corresponding to the context identifier as an accessing address to a pending register, said pending register indicating that there is an unprocessed request; writing, by the process, contents of operation requests to the I/O device or the I/O interface into the request storing area; notifying, by the process, the I/O device or the I/O interface that there is an unprocessed request by use of the accessing address for the pending register; and reading, by the I/O device or the I/O interface, the operation requests of the process which are stored at the location related to the context identifier stored in the pending register.