Order and Priority of Asynchronous I/O Calls

An application can issue several AIO requests on the same file or device.

However, because the I/O operations are performed asynchronously, the order in which they are handled might not be the order in which the I/O calls are made. The application must enforce ordering of its own I/O requests if ordering is required.

For files that support seek operations, seeking can be done as part of the asynchronous read or write operations. The whence and offset fields are provided in the control block of the request to set the seek parameters. The seek pointer is updated when the asynchronous read or write call returns.