On Mon, Mar 13, 2017 at 9:37 AM, Tom Marchant < [email protected]> wrote:
> On Sat, 11 Mar 2017 18:44:01 -0600, Bill Woodger wrote: > > >Enterprise COBOL is now, with the re-write, prepared for 64-bit > addressing. > > Unless IBM has changed their direction, 64-bit Cobol will only be useful > for new applications. It will not interact with existing code unless that > code is also converted to AMODE 64. > > The reason for that is that 64-bit Cobol will only be supported with > XPLINK-64. The design of XPLINK-64 makes it incompatible with 31-bit > XPLINK. XPLINK-64 can call non-XPLINK programs, but since it passes a save > area located above the bar, it can only call AMODE 64 programs. > > XPLINK is touted as a performance improvement over standard linkage. The > small improvement in performance makes a big difference with C programs, > with its tendency to create very small subroutines. However, the cost of > calling a program that uses standard linkage is considerably higher. > > Every time an XPLINK program issues a GET or PUT, it has to make that > transition. > ​Would you mind expanding a bit on the above? Are you talking about doing I/O to read or write a z/OS type data set (DCB or ACB)? > > -- > Tom Marchant > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- "Irrigation of the land with seawater desalinated by fusion power is ancient. It's called 'rain'." -- Michael McClary, in alt.fusion Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
