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  1. Newsgroups: comp.os.minix
  2. Path: sparky!uunet!email!hp
  3. From: hp@vmars.tuwien.ac.at (Peter Holzer)
  4. Subject: Message passing problems
  5. Message-ID: <1992Nov22.165955.10975@email.tuwien.ac.at>
  6. Sender: news@email.tuwien.ac.at
  7. Nntp-Posting-Host: quasi.vmars.tuwien.ac.at
  8. Organization: Technical University Vienna, Dept. for Realtime Systems, AUSTRIA
  9. Date: Sun, 22 Nov 1992 16:59:55 GMT
  10. Lines: 347
  11.  
  12. Some time ago, I started to implement a different kind of message
  13. passing in Minix: Messages are of arbitrary length and sent to/received
  14. from ports instead of processes. Seemed quite easy, and after a couple
  15. of hours it seemed to work: I could send and receive the new messages
  16. from user processes. Seemed to work, because it does not work reliable.
  17. If one process sends, and another receives in a loop, Minix will crash
  18. after 20...100 iterations. I have looked at the code quite often now in
  19. the last month, but I can't find the error, so I am posting the diffs,
  20. and hope that somebody can tell me what I am doing wrong.
  21.  
  22. I have a 386 with Minix 1.6.16 and the `asynchronous' virtual consoles,
  23. which has a tendency to crash during process table dumps (Ctrl-F1), so
  24. it is possible that Minix does not really crash during message passing,
  25. but somewhere else.
  26.  
  27. table
  28.  !"#$%&'()*+,-./0123456789:;<=>?
  29. @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
  30. begin 644 msg.sh
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  303. M; I8"7!O< EE8G@*6 ER970*6 I8"2YA;&EG;@DT"EA?<F5C96EV93,Z"E@)n
  304. M<'5S: EE8G@*:68)1DE24U1!4D=)3E)%1R ](# *6 EM;W8)96%X+%-20U]$m
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  306. M"6UO=@EE8W@L(U)%0T5)5D4S"0E\('-Y<U]C86QL*%)%0T5)5D4L('-R8U]Dk
  307. M97-T+"!M97-S86=E*0I8"6UO=@EE9'@L35]325I%7T]&1EME<W!="E@):6YTj
  308. M"5-94S,X-E9%0PI8"7!O< EE8G@*6 ER970*6 I8"2YA;&EG;@DT"EA?<V5Ni
  309. M9')E8S,Z"E@)<'5S: EE8G@*:68)1DE24U1!4D=)3E)%1R ](# *6 EM;W8)h
  310. M96%X+%-20U]$15-47T]&1EME<W!="F5N9&EF"E@);6]V"65B>"Q-7U!44E]/g
  311. M1D9;97-P70I8"6UO=@EE8W@L(U-%3D1214,S"0E\('-Y<U]C86QL*%-%3D12f
  312. M14,L('-R8U]D97-T+"!M97-S86=E*0I8"6UO=@EE9'@L35]325I%7T]&1EMEe
  313. M<W!="E@):6YT"5-94S,X-E9%0PI8"7!O< EE8G@*6 ER970*14Y$7T]&7T9)d
  314. M3$4*:68@=&5S=" Q,C$X("UN92!@=V,@+6,@/"=S96YD<F5C+G,G8#L@=&AEc
  315. M;@H@(" @96-H;R!S:&%R.B!<(B=S96YD<F5C+G,G7"(@=6YP86-K960@=VETb
  316. M:"!W<F]N9R!S:7IE(0IF:0HC(&5N9"!O9B G<V5N9')E8RYS)PIF:0II9B!Ta
  317. M97-T("UF("=S96YD=&5S="YC)R M82 B)'LQ?2(@(3T@(BUC(B [('1H96X@z
  318. M"B @96-H;R!S:&%R.B!7:6QL(&YO="!C;&]B8F5R(&5X:7-T:6YG(&9I;&4@y
  319. M7"(G<V5N9'1E<W0N8R=<(@IE;'-E"F5C:&\@<VAA<CH@17AT<F%C=&EN9R!<x
  320. M(B=S96YD=&5S="YC)UPB(%PH,3$R,2!C:&%R86-T97)S7"D*<V5D(")S+UY8w
  321. M+R\B(#XG<V5N9'1E<W0N8R<@/#PG14Y$7T]&7T9)3$4G"E@C:6YC;'5D92 \v
  322. M97)R;F\N:#X*6"-I;F-L=61E(#QS=&1I;RYH/@I8(VEN8VQU9&4@/'-T9&QIu
  323. M8BYH/@I8(VEN8VQU9&4@/'-Y<R]T>7!E<RYH/@I8(VEN8VQU9&4@/'-Y<R]Tt
  324. M:6UE<RYH/@I8"F-H87()*F-M;F0["E@*=F]I9"!U<V%G92 H=F]I9"D@>PI8s
  325. M"69P<FEN=&8@*'-T9&5R<BP@(E5S86=E.B E<R!P;W)T('-I>F4@<F5P96%Tr
  326. M7&XB+"!C;6YD*3L*6 EE>&ET("@Q*3L*6'T*6 I8"FEN="!M86EN("AI;G0@q
  327. M87)G8RP@8VAA<B J*F%R9W8I('L*6 EC:&%R( D)*F)U9CL*6 EI;G0)"7!Op
  328. M<G0L(')E<&5A=#L*6 ES:7IE7W0)"7-I>F4["E@)8VQO8VM?= D)=V-T,"P@o
  329. M=V-T,3L*6 ES=')U8W0@=&US"71M<V)U9C L('1M<V)U9C$["E@):6YT"0EIn
  330. M.PI8"6EN= D)<F,["E@*6 EC;6YD(#T@*&-M;F0@/2!S=')R8VAR("AA<F=Vm
  331. M(%LP72P@)R\G*2D@/R!C;6YD("LK(#H@87)G=B!;,%T["E@):68@*&%R9V,@l
  332. M(3T@-"D@=7-A9V4@*"D["E@)<&]R=" ](&%T;VD@*&%R9W8@6S%=*3L*6 ESk
  333. M:7IE(#T@871O:2 H87)G=B!;,ETI.PI8"7)E<&5A=" ](&%T;VD@*&%R9W8@j
  334. M6S-=*3L*6 I8"6EF("@H8G5F(#T@;6%L;&]C("AS:7IE*2D@/3T@3E5,3"D@i
  335. M>PI8"0EF<')I;G1F("AS=&1E<G(L(")O=70@;V8@;65M;W)Y7&XB*3L*6 D)h
  336. M97AI=" H,2D["E@)?0I8"E@)(VEF(# *6 EW8W0P(#T@=&EM97,@*"9T;7-Bg
  337. M=68P*3L*6 DC96YD:68*6 EF;W(@*&D@/2 P.R!I(#P@<F5P96%T.R!I("LKf
  338. M*2!["E@)"7!R:6YT9B H(B5D7&XB+"!I*3L*6 D):68@*"AR8R ]($]0("APe
  339. M;W)T+"!B=68L('-I>F4I*2 A/2!S:7IE*2!["E@)"0DC:68@, I8"0D)9G!Rd
  340. M:6YT9B H(FD@/2 E9"P@<F,@/2 E9"P@97)R;F\@/2 E9%QN(BP*6 D)"0D@c
  341. M:2P@<F,L(&5R<FYO*3L*6 D)"65X:70@*#$I.PI8"0D)(V5N9&EF"E@)"7T*b
  342. M6 E]"E@)(VEF(# *6 EW8W0Q(#T@=&EM97,@*"9T;7-B=68Q*3L*6 EP<FENa
  343. M=&8@*")W86QL(&-L;V-K('1I;64Z("5D7&XB+"!W8W0Q("T@=V-T,"D["E@)z
  344. M<')I;G1F("@B=7-E<B!T:6UE.B @(" @(" E9%QN(BP@=&US8G5F,2YT;7-?y
  345. M=71I;64@+2!T;7-B=68P+G1M<U]U=&EM92D["E@)<')I;G1F("@B<WES=&5Mx
  346. M('1I;64Z(" @(" E9%QN(BP@=&US8G5F,2YT;7-?<W1I;64@+2!T;7-B=68Pw
  347. M+G1M<U]S=&EM92D["E@)(V5N9&EF"E@)<F5T=7)N(# ["EA]"D5.1%]/1E]&v
  348. M24Q%"FEF('1E<W0@,3$R,2 M;F4@8'=C("UC(#PG<V5N9'1E<W0N8R=@.R!Tu
  349. M:&5N"B @("!E8VAO('-H87(Z(%PB)W-E;F1T97-T+F,G7"(@=6YP86-K960@t
  350. M=VET:"!W<F]N9R!S:7IE(0IF:0HC(&5N9"!O9B G<V5N9'1E<W0N8R<*9FD*s
  351. H96-H;R!S:&%R.B!%;F0@;V8@<VAE;&P@87)C:&EV92X*97AI=" P"B<*r
  352.  q
  353. end
  354. -- 
  355. |    _  | Peter J. Holzer                       | Think of it   |
  356. | |_|_) | Technical University Vienna           | as evolution  |
  357. | | |   | Dept. for Real-Time Systems           | in action!    |
  358. | __/   | hp@vmars.tuwien.ac.at                 |     Tony Rand |
  359.