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Subject: Problem with LWP2.0 of DJGPP
Date: Wed, 17 Sep 2003 16:59:56 +0800
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Thread-Topic: Problem with LWP2.0 of DJGPP
Thread-Index: AcN8+hEeI7QZp+5HRcOKt7wAqgiPVA==
From: "Wang Yong" <ywang AT asmpt DOT com>
To: <djgpp AT delorie DOT com>
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Reply-To: djgpp AT delorie DOT com

DJGPP version 2.03, GCC is 3.2.3. 
The LWP packet is from v2tk/jtlwp20s.zip. 
When compiling it, I get: 

  gcc -Wall -O2 -g -c lwp.c
  gcc -Wall -O2 -g -c lwpasm.S
  c:/djgpp/tmp/ccP8R9jb.s: Assembler messages:
  c:/djgpp/tmp/ccP8R9jb.s:60: Warning: indirect ljmp without `*'
  c:/djgpp/tmp/ccP8R9jb.s:85: Warning: indirect ljmp without `*'
  c:/djgpp/tmp/ccP8R9jb.s:149: Warning: indirect jmp without `*'
  ar rcs liblwp.a lwp.o lwpasm.o
  gcc -Wall -O2 -g -o example1.exe example1.c liblwp.a dpmiint.S
  gcc -Wall -O2 -g -o example2.exe example2.c liblwp.a dpmiint.S
  gcc -Wall -O2 -g -o example3.exe example3.c liblwp.a dpmiint.S
  gcc -Wall -O2 -g -o example4.exe example4.c liblwp.a dpmiint.S

When running the examples, under whatever OS (DOS or 2K/XP), in most cases, the result of example1 is: 

  MAIN
  MAIN
  MAIN
  Exiting due to signal SIGSEGV
  General Protection Fault at eip=00002ff5
  eax=00000000 ebx=00000021 ecx=00000000 edx=00000000 esi=00000006 edi=00094178
  ebp=00094154 esp=00094140 program=D:\TMP\CONTRIB\LWP\EXAMPLE1.EXE
  cs: sel=01a7  base=01cc0000  limit=0009ffff
  ds: sel=01af  base=01cc0000  limit=0009ffff
  es: sel=01b7  base=01cc0000  limit=0009ffff
  fs: sel=017f  base=000053f0  limit=0000ffff
  gs: sel=01bf  base=00000000  limit=0010ffff
  ss: sel=01af  base=01cc0000  limit=0009ffff
  App stack: [00094270..00014270]  Exceptn stack: [000141dc..0001229c]

  Call frame traceback EIPs:
    0x00002ff5
    0x00007e4c
    0x0000d22e
    0x0000beb0
    0x000062e2
    0x00001960
    0x00004a08

I modified the code of example1.c to remove mutex and added lwpEnterCriticalSection()/lwpLeaveCriticalSection() around printf() and lwpYield() in threads. Then with clean boot to ms-dos 6.22, it can run. But after I re-compile it, or just run some other applications, such as vim, if I run example1.exe again, it crashes as above. 

Any suggestions from you are welcomed. Thank you very much!

BTW: Is there any other multitask/thread libraries for DJGPP v2.03 or above? 


Sincerely,
Wang Yong