diff options
Diffstat (limited to 'pthreads/ptw32_InterlockedCompareExchange.c')
| -rw-r--r-- | pthreads/ptw32_InterlockedCompareExchange.c | 307 |
1 files changed, 0 insertions, 307 deletions
diff --git a/pthreads/ptw32_InterlockedCompareExchange.c b/pthreads/ptw32_InterlockedCompareExchange.c deleted file mode 100644 index 34ebfce22..000000000 --- a/pthreads/ptw32_InterlockedCompareExchange.c +++ /dev/null @@ -1,307 +0,0 @@ -/*
- * 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) 1999,2005 Pthreads-win32 contributors
- *
- * Contact Email: rpj@callisto.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
- */
-
-#ifndef _WIN64
-
-#include "pthread.h"
-#include "implement.h"
-
-
-/*
- * ptw32_InterlockedCompareExchange --
- *
- * Originally needed because W9x doesn't support InterlockedCompareExchange.
- * We now use this version wherever possible so we can inline it.
- */
-
-PTW32_INTERLOCKED_LONG WINAPI
-ptw32_InterlockedCompareExchange (PTW32_INTERLOCKED_LPLONG location,
- PTW32_INTERLOCKED_LONG value,
- PTW32_INTERLOCKED_LONG comparand)
-{
-
-#if defined(__WATCOMC__)
-/* Don't report that result is not assigned a value before being referenced */
-#pragma disable_message (200)
-#endif
-
- PTW32_INTERLOCKED_LONG result;
-
- /*
- * Using the LOCK prefix on uni-processor machines is significantly slower
- * and it is not necessary. The overhead of the conditional below is
- * negligible in comparison. Since an optimised DLL will inline this
- * routine, this will be faster than calling the system supplied
- * Interlocked routine, which appears to avoid the LOCK prefix on
- * uniprocessor systems. So one DLL works for all systems.
- */
- if (ptw32_smp_system)
-
-/* *INDENT-OFF* */
-
-#if defined(_M_IX86) || defined(_X86_)
-
-#if defined(_MSC_VER) || defined(__WATCOMC__) || (defined(__BORLANDC__) && defined(HAVE_TASM32))
-#define HAVE_INLINABLE_INTERLOCKED_CMPXCHG
- {
- _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
- MOV dword ptr [result], eax
- POP edx
- POP ecx
- }
- }
- else
- {
- _asm {
- PUSH ecx
- PUSH edx
- MOV ecx,dword ptr [location]
- MOV edx,dword ptr [value]
- MOV eax,dword ptr [comparand]
- CMPXCHG dword ptr [ecx],edx
- MOV dword ptr [result], eax
- POP edx
- POP ecx
- }
- }
-
-#elif defined(__GNUC__)
-#define HAVE_INLINABLE_INTERLOCKED_CMPXCHG
-
- {
- __asm__ __volatile__
- (
- "lock\n\t"
- "cmpxchgl %2,%1" /* if (EAX == [location]) */
- /* [location] = value */
- /* else */
- /* EAX = [location] */
- :"=a" (result)
- :"m" (*location), "r" (value), "a" (comparand));
- }
- else
- {
- __asm__ __volatile__
- (
- "cmpxchgl %2,%1" /* if (EAX == [location]) */
- /* [location] = value */
- /* else */
- /* EAX = [location] */
- :"=a" (result)
- :"m" (*location), "r" (value), "a" (comparand));
- }
-
-#endif
-
-#else
-
- /*
- * If execution gets to here then we're running on a currently
- * unsupported processor or compiler.
- */
-
-#error Unsupported platform or compiler!
-
-#endif
-
-/* *INDENT-ON* */
-
- return result;
-
-#if defined(__WATCOMC__)
-#pragma enable_message (200)
-#endif
-
-}
-
-/*
- * ptw32_InterlockedExchange --
- *
- * We now use this version wherever possible so we can inline it.
- */
-
-LONG WINAPI
-ptw32_InterlockedExchange (LPLONG location,
- LONG value)
-{
-
-#if defined(__WATCOMC__)
-/* Don't report that result is not assigned a value before being referenced */
-#pragma disable_message (200)
-#endif
-
- LONG result;
-
- /*
- * The XCHG instruction always locks the bus with or without the
- * LOCKED prefix. This makes it significantly slower than CMPXCHG on
- * uni-processor machines. The Windows InterlockedExchange function
- * is nearly 3 times faster than the XCHG instruction, so this routine
- * is not yet very useful for speeding up pthreads.
- */
- if (ptw32_smp_system)
-
-/* *INDENT-OFF* */
-
-#if defined(_M_IX86) || defined(_X86_)
-
-#if defined(_MSC_VER) || defined(__WATCOMC__) || (defined(__BORLANDC__) && defined(HAVE_TASM32))
-#define HAVE_INLINABLE_INTERLOCKED_XCHG
-
- {
- _asm {
- PUSH ecx
- MOV ecx,dword ptr [location]
- MOV eax,dword ptr [value]
- XCHG dword ptr [ecx],eax
- MOV dword ptr [result], eax
- POP ecx
- }
- }
- else
- {
- /*
- * Faster version of XCHG for uni-processor systems because
- * it doesn't lock the bus. If an interrupt or context switch
- * occurs between the MOV and the CMPXCHG then the value in
- * 'location' may have changed, in which case we will loop
- * back to do the MOV again.
- *
- * FIXME! Need memory barriers for the MOV+CMPXCHG combo?
- *
- * Tests show that this routine has almost identical timing
- * to Win32's InterlockedExchange(), which is much faster than
- * using the inlined 'xchg' instruction above, so it's probably
- * doing something similar to this (on UP systems).
- *
- * Can we do without the PUSH/POP instructions?
- */
- _asm {
- PUSH ecx
- PUSH edx
- MOV ecx,dword ptr [location]
- MOV edx,dword ptr [value]
-L1: MOV eax,dword ptr [ecx]
- CMPXCHG dword ptr [ecx],edx
- JNZ L1
- MOV dword ptr [result], eax
- POP edx
- POP ecx
- }
- }
-
-#elif defined(__GNUC__)
-#define HAVE_INLINABLE_INTERLOCKED_XCHG
-
- {
- __asm__ __volatile__
- (
- "xchgl %2,%1"
- :"=r" (result)
- :"m" (*location), "0" (value));
- }
- else
- {
- /*
- * Faster version of XCHG for uni-processor systems because
- * it doesn't lock the bus. If an interrupt or context switch
- * occurs between the movl and the cmpxchgl then the value in
- * 'location' may have changed, in which case we will loop
- * back to do the movl again.
- *
- * FIXME! Need memory barriers for the MOV+CMPXCHG combo?
- *
- * Tests show that this routine has almost identical timing
- * to Win32's InterlockedExchange(), and is much faster than
- * using an inlined 'xchg' instruction, so Win32 is probably
- * doing something similar to this (on UP systems).
- */
- __asm__ __volatile__
- (
- "0:\n\t"
- "movl %1,%%eax\n\t"
- "cmpxchgl %2,%1\n\t"
- "jnz 0b"
- :"=&a" (result)
- :"m" (*location), "r" (value));
- }
-
-#endif
-
-#else
-
- /*
- * If execution gets to here then we're running on a currently
- * unsupported processor or compiler.
- */
-
-#error Unsupported platform or compiler!
-
-#endif
-
-/* *INDENT-ON* */
-
- return result;
-
-#if defined(__WATCOMC__)
-#pragma enable_message (200)
-#endif
-
-}
-
-
-#if 1
-
-#if defined(PTW32_BUILD_INLINED) && defined(HAVE_INLINABLE_INTERLOCKED_CMPXCHG)
-#undef PTW32_INTERLOCKED_COMPARE_EXCHANGE
-#define PTW32_INTERLOCKED_COMPARE_EXCHANGE ptw32_InterlockedCompareExchange
-#endif
-
-#if defined(PTW32_BUILD_INLINED) && defined(HAVE_INLINABLE_INTERLOCKED_XCHG)
-#undef PTW32_INTERLOCKED_EXCHANGE
-#define PTW32_INTERLOCKED_EXCHANGE ptw32_InterlockedExchange
-#endif
-
-#endif
-
-#endif
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