HP 3000 Manuals HP 3000 Manuals
Aborting NOWAIT I/O Occasionally, after a process has started a NOWAIT I/O with FREAD or FWRITE, something occurs that causes completion of that I/O to be no longer needed. Perhaps the process is "shutting down" and does not want to wait for the I/O (that is, to issue IOWAIT or IODONTWAIT). MPE XL lets the process abort NOWAIT I/Os that have not yet completed by using FCONTROL with a controlcode of 43. A condition code of CCE is returned if the I/O was aborted; in this case, nothing more needs to be done. CCG is returned if the I/O has already completed; in this case, IODONTWAIT or IOWAIT must be called to clear it. CCL and FSERR 79, No NOWAIT I/O pending for special file, are returned if there was nothing to abort.