Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

In <[EMAIL PROTECTED]>, on 01/22/2008 at 04:12 PM, "Van Dalsen, Herbie" <[EMAIL PROTECTED]> said: >I should not ask the question, but do they exist or is it a 'virus' >inside IBM-MAIN? Google for "Wheeler Scheduler". Yes, I find the long URL lists and the repetitive OT paragraphs to be frustra

Re: How does ATTACH pass address of ECB to child?

On Thu, 24 Jan 2008 07:26:55 -0500, Peter Relson <[EMAIL PROTECTED]> wrote: >... >I disagree. Especially when the thread gets into pointing out the >deficiencies of wait/post as a serialization mechanism. Not surprising. It >really isn't one. >... What? Not for serialization? And not for queu

Re: How does ATTACH pass address of ECB to child?

>Do the contents of the ECB other than the WAIT and POST bits >matter to WAIT? no. Although, when the WAIT bit is on, they do matter to POST. >IOW, instead of "XC ECB,ECB" (or CS) would it suffice >to do as little as "MVI ECB,x'3F'" yes >Even though task synchronization and resource serialization

Re: How does ATTACH pass address of ECB to child?

nuary 23, 2008 12:15 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? In <[EMAIL PROTECTED]>, on 01/23/2008 at 12:40 PM, "Craddock, Chris" <[EMAIL PROTECTED]> said: >The most common post code (which I tend to think of as being &qu

Re: How does ATTACH pass address of ECB to child?

In <[EMAIL PROTECTED]>, on 01/23/2008 at 12:40 PM, "Craddock, Chris" <[EMAIL PROTECTED]> said: >The most common post code (which I tend to think of as being "normal") is >zero, i.e. >"POST ecbaddr,0" We must not be looking at the same code; most of what I've seen either has an EXCP bias and

Re: How does ATTACH pass address of ECB to child? (1

On Wed, 23 Jan 2008 00:10:57 -0500, Craddock, Chris <[EMAIL PROTECTED]> wrote: >... >Yes because leaving aside the "quirks" with the current wait/post >mechanism, the wait/post logic is at best, half of the problem in any >true multitasking code. ... Sorry to be falling way behind in my pedanta

Re: How does ATTACH pass address of ECB to child? (1

On Wed, 23 Jan 2008 12:50:54 -0500, Craddock, Chris <[EMAIL PROTECTED]> wrote: >> BTW, do the contents of the ECB other than the WAIT and POST bits >> matter to WAIT? IOW, instead of "XC ECB,ECB" (or CS) would it suffice >> to do as little as "MVI ECB,x'3F'", or would it disrupt the fabric >> of

Re: How does ATTACH pass address of ECB to child?

Craddock, Chris wrote: BTW, why is everybody boycotting EVENTS? It's just a cover function for wait/post. It is more efficient than WAIT in the case where you have lots of potential events to be waited on, but the units are still ECBs so it has most of the same pitfalls. I never knew

Re: How does ATTACH pass address of ECB to child? (1

In <[EMAIL PROTECTED]>, on 01/22/2008 at 11:42 PM, "Craddock, Chris" <[EMAIL PROTECTED]> said: >You're comparing apples and fish. Locking has nothing to do with it. >Outside of the sup-state-only suspend/resume function, wait/post was the >only primitive available for synchronizing separate uni

Re: How does ATTACH pass address of ECB to child? (1

From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Paul Gilmartin Sent: Wednesday, January 23, 2008 11:31 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? (1 On Wed, 23 Jan 2008 07:53:42 -0800, Edward Jaffe wrote: > >I agree that WAIT/P

Re: How does ATTACH pass address of ECB to child? (1

> BTW, do the contents of the ECB other than the WAIT and POST bits > matter to WAIT? IOW, instead of "XC ECB,ECB" (or CS) would it suffice > to do as little as "MVI ECB,x'3F'", or would it disrupt the fabric > of the universe? (Don't ask "why"; mere scientific interest.) No the universe will be

Re: How does ATTACH pass address of ECB to child?

> >Nope. It falls prey to the TOCTTOU problem. Moreover, the "normal" > >content of the ECB after a post is X'4000', > > That's a legitimate value, but I doubt that it's normal. The most common post code (which I tend to think of as being "normal") is zero, i.e. "POST ecbaddr,0" And for th

Re: How does ATTACH pass address of ECB to child? (1

: Wednesday, January 23, 2008 9:31 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? (1 On Wed, 23 Jan 2008 07:53:42 -0800, Edward Jaffe wrote: > >I agree that WAIT/POST -- a service that's been around since OS/360 -- >seems simple enough on th

Re: How does ATTACH pass address of ECB to child? (1

On Wed, 23 Jan 2008 07:53:42 -0800, Edward Jaffe wrote: > >I agree that WAIT/POST -- a service that's been around since OS/360 -- >seems simple enough on the surface. But, look how many people on >IBM-MAIN are still exhibiting confusion regarding its use -- even about >something as fundamental as h

Re: How does ATTACH pass address of ECB to child? (1

David Logan wrote: Even though task synchronization and resource serialization are technically different, for the purposes of this discussion, they are essentially the same thing. Lock, ENQ, latch, etc.serialize update access to any resource being accessed concurrently by two or more asynch

Re: How does ATTACH pass address of ECB to child? (1

--- If you really do have multiple units of work that need to coordinate their processing then you need; not only a way to poke the other guy in the arm or wait for a poke in the arm, but you also need something that doesn't allow you to miss a poke in

Re: How does ATTACH pass address of ECB to child?

In <[EMAIL PROTECTED]>, on 01/22/2008 at 01:22 PM, "Craddock, Chris" <[EMAIL PROTECTED]> said: >Nope. It falls prey to the TOCTTOU problem. Moreover, the "normal" >content of the ECB after a post is X'4000', That's a legitimate value, but I doubt that it's normal. BTW, why is everybody bo

Re: How does ATTACH pass address of ECB to child? (1

Behalf Of Edward Jaffe Sent: Wednesday, January 23, 2008 12:19 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? (1 David Logan wrote: > No, I didn't think you were arguing that WAIT/POST didn't work, and you do > definitely have some valid poi

Re: How does ATTACH pass address of ECB to child? (1

On Jan 22, 2008, at 11:10 PM, Craddock, Chris wrote: Pat O'Keefe said But I have a feeling you want something that goes beyond the intended purpose of POST and WAIT, not just a cleaned up version of the existing function. ---SNIP Good Stuff-From Chris C--- A *LONG* time ago (

Re: How does ATTACH pass address of ECB to child? (1

David Logan wrote: No, I didn't think you were arguing that WAIT/POST didn't work, and you do definitely have some valid points. It would be *quite* difficult to use for more advanced locking requirements, such as multiple tasks. Task synchronization and locking only are tangentially related c

Re: How does ATTACH pass address of ECB to child? (1

David Logan wrote: I don't understand the reams of discussion about how to handle multiple threads working on a single ECB, or even a single thread spuriously posting an ECB. It isn't what it was designed for. Ummm. Yes. It is. That how most of z/OS is put together! And, most ISV software t

Re: How does ATTACH pass address of ECB to child? (1

Pat O'Keefe said > But I have a feeling you want something that goes beyond the intended > purpose of POST and WAIT, not just a cleaned up version of the > existing function. Yes because leaving aside the "quirks" with the current wait/post mechanism, the wait/post logic is at best, half of the p

Re: How does ATTACH pass address of ECB to child? (1

st [mailto:[EMAIL PROTECTED] On Behalf Of Craddock, Chris Sent: Tuesday, January 22, 2008 9:43 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? (1 > I don't understand the reams of discussion about how to handle multiple > threads working on a single

Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

On Jan 22, 2008, at 10:08 AM, Hardee, Charles H wrote: Edward, It may be better asked off list, but I have been wondering the same thing for a long time as well. Frankly, I'm glad the question was asked. Can anyone offer a definitive answer? Or just speculation? Chuck --SNIP-

Re: How does ATTACH pass address of ECB to child? (1

> I don't understand the reams of discussion about how to handle multiple > threads working on a single ECB, or even a single thread spuriously > posting an ECB. It isn't what it was designed for. Given it was the only mechanism provided, by definition it was intended for all synchronization purpo

Re: How does ATTACH pass address of ECB to child? (1

On Tue, 22 Jan 2008 21:36:02 -0500, Craddock, Chris <[EMAIL PROTECTED]> wrote: >... >I've been using it a little while myself :-) and so I do agree that when >used entirely within it's most tightly constrained boundaries "it >works". But as I pointed out earlier there are many unobvious traps for

Re: How does ATTACH pass address of ECB to child? (1

ficient and does exactly what it is supposed to do. David Logan -Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Craddock, Chris Sent: Tuesday, January 22, 2008 7:36 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to c

Re: How does ATTACH pass address of ECB to child? (1

Gerhard wrote: > Craddock, Chris wrote: > > Nope! After a normal post the compare value is going to be X'4000' > > and the swap value is going to be 0. If another post intervenes and > > stores another X'4000' in place of the first, then the compare is > > going to succeed and you'll miss a

Re: How does ATTACH pass address of ECB to child?

Lindy Mayfield wrote: I know personally that I couldn't get my head around this stuff unless I imagined some sort of application and how it would work using threads. Assume you have a start task that is designed to service requests from VTAM terminals. With the current VTAM design, one task h

Re: How does ATTACH pass address of ECB to child?

> Whenever the queue is empty, the queue emptier WAITs. But if the > queue is storage constrained, it can fill up. What does the > queue filler do then? There are at least two types of queues; static queues, where all of the elements are pre-allocated/formatted by the queue owner and dynamic que

Re: How does ATTACH pass address of ECB to child? (1

Craddock, Chris wrote: Nope! After a normal post the compare value is going to be X'4000' and the swap value is going to be 0. If another post intervenes and stores another X'4000' in place of the first, then the compare is going to succeed and you'll miss a valid post. There's no way out

Re: How does ATTACH pass address of ECB to child?

On Tue, 22 Jan 2008 18:28:02 -0600, Patrick O'Keefe wrote: > >I don't think there can be a general answer to that question. If the >queue is full the queue filler has to stop putting stuff on the queue. >That means it has to stop accepting (or generating) its input, or has >to throw that input awa

Re: How does ATTACH pass address of ECB to child?

Paul Gilmartin wrote: Aha! At last I see. That answers my question to Peter R. But I was envisioning a technique in which only one task at a time updates the queue, handing it back and forth with two ECBs. Now there's still need to manage concurrent accesses to the queue. I suppose CS can be

Re: How does ATTACH pass address of ECB to child?

On Tue, 22 Jan 2008 17:00:07 -0600, Paul Gilmartin <[EMAIL PROTECTED]> wrote: >... >Whenever the queue is empty, the queue emptier WAITs. But if the >queue is storage constrained, it can fill up. What does the >queue filler do then? >... I don't think there can be a general answer to that ques

Re: How does ATTACH pass address of ECB to child?

On Wed, 23 Jan 2008 00:28:42 +0100, Lindy Mayfield wrote: >Would you mind, Paul, giving a couple of examples of real life programs >that you are thinking about? > With apologies: It's been decades since I did it; the language was not Assembler but Pascal; it would be difficult or impossible to fi

Re: How does ATTACH pass address of ECB to child?

-Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Paul Gilmartin Sent: 23. tammikuuta 2008 1:00 To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? Aha! At last I see. That answers my question to Peter R. But I wa

Re: How does ATTACH pass address of ECB to child?

On Tue, 22 Jan 2008 11:49:34 -0800, Edward Jaffe wrote: >> >>> Rather, to request that a service task perform some function, one should >>> put the request on a queue and then POST the ECB on which the service >>> task WAITs for work. (Note: In a design involving multiple requesters, >>> many such

Re: How does ATTACH pass address of ECB to child?

The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well. [EMAIL PROTECTED] (Farley, Peter x23353) writes: > Granted, but the converse is also true: A posix-style semaphore or > queuing mechanism is way overkill for the si

Re: How does ATTACH pass address of ECB to child? (1

> -Original Message- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Craddock, Chris > Sent: Tuesday, January 22, 2008 1:29 PM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: How does ATTACH pass address of ECB to child? (1 > In anything but

Re: How does ATTACH pass address of ECB to child?

On Tue, 2008-01-22 at 13:22 -0500, Craddock, Chris wrote: > Did I mention it was a crap mechanism? I must have missed that nuance - could you explain a little what you mean ??? . . . Shane ... -- For IBM-MAIN subscribe / sign

Re: How does ATTACH pass address of ECB to child?

Paul Gilmartin wrote: On Tue, 22 Jan 2008 10:51:29 -0800, Edward Jaffe wrote: Rather, to request that a service task perform some function, one should put the request on a queue and then POST the ECB on which the service task WAITs for work. (Note: In a design involving multiple requesters,

Re: How does ATTACH pass address of ECB to child?

On Tue, 22 Jan 2008 10:51:29 -0800, Edward Jaffe wrote: >Craddock, Chris wrote: >> More typically you also need to develop a robust queuing mechanism for >> passing work requests and responses between requesters and servers. That >> is because, if you look dispassionately at the ECB as an interfac

Re: How does ATTACH pass address of ECB to child? (1

On Tue, 22 Jan 2008 12:37:34 -0500, Gerhard Postpischil wrote: >Paul Gilmartin wrote: >> (I did say "clear the ECB" before POSTing the other task, didn't I?) >> That's "should", not "must". And why not? It can't really matter, >> because even if the code is the minimal: >> >> WAIT >

Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

Here, for instance: http://groups.google.com/group/bit.listserv.ibm-main/msg/7941aee482af5b4 8? Jon Lynn has answered that question a while ago. Check the archives. (His or ibm-main's) -- For IBM-MAIN subscribe / signoff /

Re: How does ATTACH pass address of ECB to child?

Craddock, Chris wrote: More typically you also need to develop a robust queuing mechanism for passing work requests and responses between requesters and servers. That is because, if you look dispassionately at the ECB as an interface, there is no way to avoid the potential of missing an interveni

Re: How does ATTACH pass address of ECB to child? (1

> > (I did say "clear the ECB" before POSTing the other task, didn't I?) > > That's "should", not "must". And why not? It can't really matter, > > because even if the code is the minimal: > > > > WAIT > > L R1,ECBPreserve condition code > > XCECB

Re: How does ATTACH pass address of ECB to child? (1

On Tue, 22 Jan 2008 08:00:52 -0500, Peter Relson <[EMAIL PROTECTED]> wrote: >You can be certain that POST will always support the CS quick-post protocol >and the LOCAL LOCK. I've never understood why, after all these years, IBM hasn't put the quick-post code right into the POST macro. Of course t

Re: How does ATTACH pass address of ECB to child?

> One little glitch remains. The mother needs to know when the daugnter > is ready to accept more work. Either of the following works: > > o The daughter can simply clear the ECB to zeroes and the mother > can use this as an indication that the daughter is ready to be > POSTed. But in some

Re: How does ATTACH pass address of ECB to child? (1

Paul Gilmartin wrote: (I did say "clear the ECB" before POSTing the other task, didn't I?) That's "should", not "must". And why not? It can't really matter, because even if the code is the minimal: WAIT L R1,ECBPreserve condition code XCECB,EC

Re: How does ATTACH pass address of ECB to child?

In <[EMAIL PROTECTED]>, on 01/22/2008 at 10:00 AM, Rob Scott <[EMAIL PROTECTED]> said: >but then again that could describe quite a few board members :-) There are none; this is not a boars. -- Shmuel (Seymour J.) Metz, SysProg and JOAT ISO position; see

Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

Thanks -Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Tom Schmidt Sent: 22 Januarie 2008 04:51 nm To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?) Lynn has answered that question a

Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

Lynn has answered that question a while ago. Check the archives. (His or ibm-main's) -- Tom Schmidt -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-M

Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

e: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?) Edward, It may be better asked off list, but I have been wondering the same thing for a long time as well. Frankly, I'm glad the question was asked. Can anyone offer a definitive answer? Or just speculation? Chuck -O

Re: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

EMAIL PROTECTED] On Behalf Of Edward Jaffe Sent: Tuesday, January 22, 2008 9:08 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Wheeler Postings (Was: How does ATTACH pass address of ECB to child?) David Logan wrote: > Sorry for the slightly off-topic question, but how come this persons posts > are always so

Re: How does ATTACH pass address of ECB to child?

e of the details are slightly garbled: > http://www.ibmsystemsmag.com/mainframe/marchapril05/stoprun/10020p1.aspx re: http://www.garlic.com/~lynn/2008b.html#63 How does ATTACH pass address of ECB to child? http://www.garlic.com/~lynn/2008b.html#65 How does ATTACH pass address of ECB to c

Re: How does ATTACH pass address of ECB to child?

http://www.garlic.com/~lynn/2008b.html#63 How does ATTACH pass address of ECB to child? some of it overlaps http://www.garlic.com/~lynn/2008b.html#27 Re-hosting IMB-MAIN and some of it explained in these recent postings http://www.garlic.com/~lynn/2008b.html#57 http://www.garlic.com/~lynn/2008b

Wheeler Postings (Was: How does ATTACH pass address of ECB to child?)

David Logan wrote: Sorry for the slightly off-topic question, but how come this persons posts are always so complicated to work through with all of the pieces and URL links? Is it the function of how they are posting (i.e. perhaps online with certain options), or is this a manual effort? Thi

Re: How does ATTACH pass address of ECB to child?

t: 22 January 2008 14:34 To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? Sorry for the slightly off-topic question, but how come this persons posts are always so complicated to work through with all of the pieces and URL links? Is it the function of how they a

Re: How does ATTACH pass address of ECB to child?

st protocol > and the LOCAL LOCK. re: http://www.garlic.com/~lynn/2008b.html#50 How does ATTACH pass address of ECB to child? as stated in the above post ... the principles of operation wording is from over 35yrs ago ... charlie had invented the compare&swap instruction at the science cent

Re: How does ATTACH pass address of ECB to child?

: http://www.garlic.com/~lynn/2008b.html#50 How does ATTACH pass address of ECB to child? as stated in the above post ... the principles of operation wording is from over 35yrs ago ... charlie had invented the compare&swap instruction at the science center while doing fine-grain lock for cp67 ... and the po

Re: How does ATTACH pass address of ECB to child? (1

On Tue, 22 Jan 2008 08:00:52 -0500, Peter Relson wrote: >You can be certain that POST will always support the CS quick-post protocol >and the LOCAL LOCK. > OK. I'll be confident. But why is this not documented in the Assembler Services Reference? Interestingly, there, I see for POST: #<<<

Re: How does ATTACH pass address of ECB to child? (1

You can be certain that POST will always support the CS quick-post protocol and the LOCAL LOCK. I'm curious, as nothing pops to mind: has there been any case where the serialization of a documented programming interface has changed? Maybe I should limit my question to z/OS BCP where compatibility

Re: How does ATTACH pass address of ECB to child?

In <[EMAIL PROTECTED]>, on 01/21/2008 at 11:10 AM, Paul Gilmartin <[EMAIL PROTECTED]> said: >I have believed, and other updates to this thread appear to concur, that >WAIT/POST are older than CS. At some time, then, WAIT/POST code must >have used some other locking mechanism. That much is tr

Re: How does ATTACH pass address of ECB to child?

On Tue, 22 Jan 2008 01:31:45 -0500, Robert A. Rosenberg wrote: >At 1:38 PM -0600 on 1/21/08, Paul Gilmartin wrote about Re: How does >ATTACH pass address of ECB to child?: > >>When the mother needs the daughter's assistance, it WAITs on the >>second ECB, clears it, and P

SV: How does ATTACH pass address of ECB to child?

ckat: den 22 januari 2008 06:56 > Till: IBM-MAIN@BAMA.UA.EDU > Ämne: Re: How does ATTACH pass address of ECB to child? > > Warning: kind of a long-ish reply coming up; > > > What exactly is wrong with the ECB/WAIT/POST mechanism? I > think it has > > always wo

Re: How does ATTACH pass address of ECB to child?

At 1:38 PM -0600 on 1/21/08, Paul Gilmartin wrote about Re: How does ATTACH pass address of ECB to child?: When the mother needs the daughter's assistance, it WAITs on the second ECB, clears it, and POSTS the first. ONLY IF the mother task has nothing else it can do while it is waitin

Re: How does ATTACH pass address of ECB to child?

Warning: kind of a long-ish reply coming up; > What exactly is wrong with the ECB/WAIT/POST mechanism? I think it has > always worked great. It's got some pretty difficult limitations in cross > memory mode (but it still works!), but otherwise I'm not sure where you > get "awful". Yeah, it works

Re: How does ATTACH pass address of ECB to child?

From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Henry Willard Sent: Monday, January 21, 2008 4:14 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? "Craddock, Chris" wrote: > > As in horshoes? Yes. The ECB is one of the most

Re: How does ATTACH pass address of ECB to child?

"Craddock, Chris" wrote: > > As in horshoes? Yes. The ECB is one of the most widely used "tools" in > the system. As a serialization primitive it is just awful, but there's > no getting away from it now. > The ECB might not be perfect, but compared to what you have to put up with on Unix where th

Re: How does ATTACH pass address of ECB to child?

ng systems ... which only allow one single transaction at a time to fetch a value ... and no other transaction is allowed to fetch a value (or otherwise proceed) until the active transaction has completed ... this is somewhat analogous to the kernel spin-lock mentioned in previous description: http:/

Re: How does ATTACH pass address of ECB to child?

On Mon, 21 Jan 2008 13:56:37 -0500, Craddock, Chris wrote: >> But, and this is what was so hard for me to get. Mother can pass >> Daughter an ECB for the Daughter task to use. Daughter does some >stuff >> and then WAITs. Mother goes about her business until she needs >Daughter >> do so somethin

Re: How does ATTACH pass address of ECB to child?

> -Original Message- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Lindy Mayfield > Sent: Monday, January 21, 2008 12:34 PM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: How does ATTACH pass address of ECB to child? [snip] > > Lindy

Re: How does ATTACH pass address of ECB to child?

> But, and this is what was so hard for me to get. Mother can pass > Daughter an ECB for the Daughter task to use. Daughter does some stuff > and then WAITs. Mother goes about her business until she needs Daughter > do so something. Mother clears the ECB and POSTs > it freeing Daughter from he

Re: How does ATTACH pass address of ECB to child?

> I understand that during a WAIT, bits 1-31 of the ECB hold the > address of a control block. If that control block resides above > the Line, might not its address spoof the POST bit? I suppose > this is not a concern because no two tasks are allowed to WAIT > concurrently on the same ECB. The

Re: How does ATTACH pass address of ECB to child?

ssage- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Lindy Mayfield Sent: Monday, January 21, 2008 12:34 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? The light bulb finally went off, ever so dimly. Now I think I got it. A

Re: How does ATTACH pass address of ECB to child?

Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of David Logan Sent: 20. tammikuuta 2008 18:55 To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? The bottom line is that one task needs to be suspended until some event occurs. WAIT causes MVS to suspe

Re: How does ATTACH pass address of ECB to child?

ht > there be open-source archival MVS (3.8 or earlier) that could > execute on emulated hardware supporting CS, but for which POST > requires the actual SVC? re: http://www.garlic.com/~lynn/2008b.html#31 How does ATTACH pass address of ECB to child? http://www.garlic.com/~lynn/2008b.h

Re: How does ATTACH pass address of ECB to child?

> -Original Message- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of McKown, John > Sent: Monday, January 21, 2008 11:28 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: How does ATTACH pass address of ECB to child? > > > > -

Re: How does ATTACH pass address of ECB to child?

> -Original Message- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Paul Gilmartin > Sent: Monday, January 21, 2008 11:11 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: How does ATTACH pass address of ECB to child? > > > On Sun,

Re: How does ATTACH pass address of ECB to child?

On Sun, 20 Jan 2008 11:09:57 -0800, Edward Jaffe wrote: >Binyamin Dissen wrote: >> In the past (370 pre PLO), CS was the only way to do this function. >> >> While it certainly is possible for IBM to rewrite WAIT/POST to use the PLO >> instruction, I certainly doubt that such a code change will occ

Re: How does ATTACH pass address of ECB to child?

uary 20, 2008 3:50 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well. [EMAIL PROTECTED] (David Logan) writes: > While all of

Re: How does ATTACH pass address of ECB to child?

by the time of the > TM. re: http://www.garlic.com/~lynn/2008b.html#50 How does ATTACH pass address of ECB to child? http://www.garlic.com/~lynn/2008b.html#50 How does ATTACH pass address of ECB to child? aka ... the ECB is defined as "testing" both bits zero and one ... where atomic te

Re: How does ATTACH pass address of ECB to child?

been set by the time of the > TM. the original post http://www.garlic.com/~lynn/2008b.html#31 How does ATTACH pass address of ECB to child was about quote from the principles of operation with regard to the example of post routine bypass: A.6.3.1 Bypass Post Routine http://publibz.boulder.ibm.com/c

Re: How does ATTACH pass address of ECB to child?

re: http://www.garlic.com/~lynn/2008b.html#31 How does ATTACH pass address of ECB to child? http://www.garlic.com/~lynn/2008b.html#47 How does ATTACH pass address of ECB to child? the issue with atomic test&set was that it was a purely binary value ... locked or not locked. charlie was working on fin

Re: How does ATTACH pass address of ECB to child?

Binyamin Dissen wrote: In the past (370 pre PLO), CS was the only way to do this function. While it certainly is possible for IBM to rewrite WAIT/POST to use the PLO instruction, I certainly doubt that such a code change will occur. Especially since PLO and CS do not serialize each other's

Re: How does ATTACH pass address of ECB to child?

ACH pass address of ECB to child? http://www.garlic.com/~lynn/2008b.html#47 How does ATTACH pass address of ECB to child? the issue with atomic test&set was that it was a purely binary value ... locked or not locked. charlie was working on fine-grain cp67 multiprocessing locking at the science

Re: How does ATTACH pass address of ECB to child?

Test and set works just fine too. They are both atomic. David Logan -Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Anne & Lynn Wheeler Sent: Sunday, January 20, 2008 11:32 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass add

Re: How does ATTACH pass address of ECB to child?

The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well. [EMAIL PROTECTED] (Paul Gilmartin) writes: > This is the Principles of Operation; it is not the Assembler Services > manual. Note carefully the "provided that" clau

Re: How does ATTACH pass address of ECB to child?

To summarize, since all the appends I have read through have been correct, For the ECB mentioned in ATTACH,EP=CHILD,ECB=ECB1 WAIT ECB=ECB1 DETACH (R1) the answer to the subject question is: "You don't". The child should not be looking at this ECB. This ECB is for use by the system when the attach

Re: How does ATTACH pass address of ECB to child?

: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Lindy Mayfield Sent: Sunday, January 20, 2008 9:45 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? I was curious for what reason or when one would use the POST macro. I've been readin

Re: How does ATTACH pass address of ECB to child?

l who helped me. -Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of David Logan Sent: 20. tammikuuta 2008 18:30 To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? I'm not sure what you are asking regarding your quest

Re: How does ATTACH pass address of ECB to child?

On Sun, 20 Jan 2008 10:07:07 -0600 Paul Gilmartin <[EMAIL PROTECTED]> wrote: :>On Fri, 18 Jan 2008 20:38:15 -0500, Anne & Lynn Wheeler wrote: :>>A.6.3.1 Bypass Post Routine :>>http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DZ9ZR003/A.6.3.1?SHELF=DZ9ZBK03&DT=20040504121320&CASE= :>>fr

Re: How does ATTACH pass address of ECB to child?

ssage- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Lindy Mayfield Sent: Sunday, January 20, 2008 9:17 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? Let me see if I am understanding it all. There really isn't a need for th

Re: How does ATTACH pass address of ECB to child?

@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? On Sun, 20 Jan 2008 16:00:41 +0100, Lindy Mayfield wrote: >Ok, thanks, I see now. ATTACH doesn't put it there automatically, I put >it there unless I use a parameter list, and then I would make it a part >of tha

Re: How does ATTACH pass address of ECB to child?

On Fri, 18 Jan 2008 20:38:15 -0500, Anne & Lynn Wheeler wrote: > >A.6.3.1 Bypass Post Routine >http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DZ9ZR003/A.6.3.1?SHELF=DZ9ZBK03&DT=20040504121320&CASE= > >from above: > >The following routine allows the SVC "POST" as used in MVS/ESA to be >b

Re: How does ATTACH pass address of ECB to child?

On Sun, 20 Jan 2008 16:00:41 +0100, Lindy Mayfield wrote: >Ok, thanks, I see now. ATTACH doesn't put it there automatically, I put >it there unless I use a parameter list, and then I would make it a part >of that list. > Now that you can find it, what use can you make of it? You shouldn't POST i

Re: How does ATTACH pass address of ECB to child?

: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Larry Crilley Sent: 20. tammikuuta 2008 15:54 To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How does ATTACH pass address of ECB to child? Not sure if someone responded or not... When the daughter is entered, the ECB address will be o

Re: How does ATTACH pass address of ECB to child?

.EDU Subject: Re: How does ATTACH pass address of ECB to child? Thanks. That makes sense. What doesn't is that Cannatello's book has a page and a half on doing POST, with one example of how to change the ECB without using the POST macro. He even has the child checking the ECB to see if a

Re: How does ATTACH pass address of ECB to child?

The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main,alt.folklore.computers as well. [EMAIL PROTECTED] (Lindy Mayfield) writes: > What doesn't is that Cannatello's book has a page and a half on doing > POST, with one example of how to change the ECB

Re: How does ATTACH pass address of ECB to child?

Rick Fochtman wrote: Thanks. That makes sense. What doesn't is that Cannatello's book has a page and a half on doing POST, with one example of how to change the ECB without using the POST macro. He even has the child checking the ECB to see if a WAIT

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