From mboxrd@z Thu Jan  1 00:00:00 1970
From: "van Lieshout, Fred" <Fred.vanLieshout@atosorigin.com>
To: "'martin@gadgets.co.nz'" <martin@gadgets.co.nz>, "'pthreads-win32@sources.redhat.com'" <pthreads-win32@sources.redhat.com>
Subject: Re: PThreads under win95 linked to missing export 
Date: Wed, 15 Aug 2001 13:20:00 -0000
Message-id: <E1B81A5627BAD01191B500805FC16B0ED75218@nlnwx001.nwgbak.nl.origin-it.com>
X-SW-Source: 2001/msg00112.html

The source of the problem appears to be that InterlockedCompareExchange()
"Requires Windows 98 or later" (according to MSDN).Dave--- 
Martin van den Nieuwelaar <martin@gadgets.co.nz> wrote:
> The PTHREADVCE.DLL file is linked to missing export
KERNEL32.DLL:InterlockedCompareExchange 

Martin,

Just in case you really need the latest pthread lib, here's a work around
that may do the trick: create your 'own' InterlockedCompareExchange function
using  some assembly code (not the best optimised, I know) and the Intel
CMPXCHG instruction:

extern PVOID InterlockedCompareExchange(PVOID *shared, PVOID v, PVOID c)
{
  PVOID result;

  _asm {
    PUSH         ecx
    PUSH         edx
    MOV          ecx,dword ptr [shared] ; Load ECX with plTarget
    MOV          edx,dword ptr [v]      ; Load EDX with lValue
    MOV          eax,dword ptr [c]
    LOCK CMPXCHG dword ptr [ecx],edx    ; if (EAX == [ECX]), 
                                        ;   [ECX] = EDX
			                      ; else
						    ;   EAX = [ECX]
    MOV          dword ptr [result], eax
    POP          edx
    POP          ecx
  }
  return result;
}

With thanks to an article on MSDN (search on the function's name).

Cheers,
Fred