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/*
* ptw32_InterlockedCompareExchange.c
*
* Description:
* This translation unit implements routines which are private to
* the implementation and may be used throughout it.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2002 Pthreads-win32 contributors
*
* Contact Email: rpj@ise.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
/*
* ptw32_InterlockedCompareExchange --
*
* Needed because W95 doesn't support InterlockedCompareExchange.
* It is only used when running the dll on W95. Other versions of
* Windows use the Win32 supported version, which may be running on
* different processor types.
*
* This can't be inlined because we need to know it's address so that
* we can call it through a pointer.
*/
PTW32_INTERLOCKED_LONG WINAPI
ptw32_InterlockedCompareExchange(PTW32_INTERLOCKED_LPLONG location,
PTW32_INTERLOCKED_LONG value,
PTW32_INTERLOCKED_LONG comparand)
{
PTW32_INTERLOCKED_LONG result;
#if defined(_M_IX86) || defined(_X86_)
#if defined(_MSC_VER)
_asm {
PUSH ecx
PUSH edx
MOV ecx,dword ptr [location]
MOV edx,dword ptr [value]
MOV eax,dword ptr [comparand]
LOCK CMPXCHG dword ptr [ecx],edx ; if (EAX == [ECX]),
; [ECX] = EDX
; else
; EAX = [ECX]
MOV dword ptr [result], eax
POP edx
POP ecx
}
#elif defined(__GNUC__)
__asm__
(
"lock\n\t"
"cmpxchgl %3,(%0)" /* if (EAX == [location]), */
/* [location] = value */
/* else */
/* EAX = [location] */
:"=r" (location), "=a" (result)
:"0" (location), "q" (value), "a" (comparand)
: "memory" );
#endif
#else
/*
* If execution gets to here then we should be running on a Win95 system
* but either running on something other than an X86 processor, or a
* compiler other than MSVC or GCC. Pthreads-win32 doesn't support that
* platform (yet).
*/
result = 0;
#endif
return result;
}
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