Article View: comp.sys.apple2.gno
Article #298Machine language forking
From: Phillip Vandry
Date: Wed, 18 Nov 1992 03:53
Date: Wed, 18 Nov 1992 03:53
40 lines
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1582 bytes
I'm having problems -- crashy problems with creating a child process.
Consider this code fragment:
fork #process
sta pid1
loop34 wait #0
brk 0
case on
cmp pid1
bne loop34
brl bigbig
It's almost identical to the code in script.asm, so it should work!
It's supposed to create a process and wait until the child exits.
It crashes sometime after the child quits and sometime before the brk
statement in the above code. I know that it crashed after the child has
died because GNO Snooper says the child does not exist at the time of the
crash.
Just in case it's relevant, the child starts, bla, bla, and so on, and
exits via
lda #0
clc
rtl
That's how the children in the script source code die too, so that should
be all right.
It's probably some kind of stack corruption because the crash happens in
bank 0. Anyways, I don't know.
If I'm doing something wrong, please tell me. Thanks.
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Newsgroups: comp.sys.apple2.gno Path: arc1-ca.pugleaf.net!sparky!uunet!utcsri!newsflash.concordia.ca!IRO.UMontreal.CA!matrox!altitude!vandry From: vandry@CAM.ORG (Phillip Vandry) Subject: Machine language forking Message-ID: <Bxw84n.I5C@CAM.ORG> Organization: Champlain Regional College, St-Lambert QC CANADA Date: Wed, 18 Nov 1992 03:53:10 GMT Lines: 40