On 23 November 2015 at 12:11, Doug Henry <[email protected]> wrote: > On Mon, 16 Nov 2015 15:02:34 -0500, Tony Harminc <[email protected]> wrote: > > In the case of a SYSOUT >>dataset handled by JESn, instead of an EXCP when the buffer is full, >>the special SVC 111 (HAM = HASP Access Method) is used to get control >>over to JESn code. >> > > This is historically accurate is hasn't been this way for a long time. If you > look in SHASSRC(HASCHAM) you will see that instead of svc it uses a PC. If > fact you can find " SVC 111 is no longer supported or used. "
Hmmph... Shows how up to date with JES2 I am. (Actually there are only minimal comment changes in HASCHAM, with plenty of references to SVC 111 remaining. But I accept that it's gone...) Nonetheless, my point remains that a would-be author of a subsystem I/O method has similar work to do: >> Since in general the caller of (say) >> PUT will be unprivileged, if you want to get privileged code of yours >> running, and/or transfer to another address space, you will need a >> mechanism such as SVC or PC to get into an appropriate state. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
