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Diffstat (limited to 'externals/mysql/atomic/generic-msvc.h')
| -rw-r--r-- | externals/mysql/atomic/generic-msvc.h | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/externals/mysql/atomic/generic-msvc.h b/externals/mysql/atomic/generic-msvc.h deleted file mode 100644 index a8601e993ba..00000000000 --- a/externals/mysql/atomic/generic-msvc.h +++ /dev/null @@ -1,115 +0,0 @@ -/* Copyright (C) 2006-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; version 2 of the License. - - This program 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 General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ - -#ifndef _atomic_h_cleanup_ -#define _atomic_h_cleanup_ "atomic/generic-msvc.h" - -/* - We don't implement anything specific for MY_ATOMIC_MODE_DUMMY, always use - intrinsics. - 8 and 16-bit atomics are not implemented, but it can be done if necessary. -*/ - -/* - x86 compilers (both VS2003 or VS2005) never use instrinsics, but generate - function calls to kernel32 instead, even in the optimized build. - We force intrinsics as described in MSDN documentation for - _InterlockedCompareExchange. -*/ -#ifdef _M_IX86 - -#if (_MSC_VER >= 1500) -#include <intrin.h> -#else -C_MODE_START -/*Visual Studio 2003 and earlier do not have prototypes for atomic intrinsics*/ -LONG _InterlockedExchange (LONG volatile *Target,LONG Value); -LONG _InterlockedCompareExchange (LONG volatile *Target, LONG Value, LONG Comp); -LONG _InterlockedExchangeAdd (LONG volatile *Addend, LONG Value); -C_MODE_END - -#pragma intrinsic(_InterlockedExchangeAdd) -#pragma intrinsic(_InterlockedCompareExchange) -#pragma intrinsic(_InterlockedExchange) -#endif - -#define InterlockedExchange _InterlockedExchange -#define InterlockedExchangeAdd _InterlockedExchangeAdd -#define InterlockedCompareExchange _InterlockedCompareExchange -/* - No need to do something special for InterlockedCompareExchangePointer - as it is a #define to InterlockedCompareExchange. The same applies to - InterlockedExchangePointer. -*/ -#endif /*_M_IX86*/ - -#define MY_ATOMIC_MODE "msvc-intrinsics" -#define IL_EXCHG_ADD32(X,Y) InterlockedExchangeAdd((volatile LONG *)(X),(Y)) -#define IL_COMP_EXCHG32(X,Y,Z) InterlockedCompareExchange((volatile LONG *)(X),(Y),(Z)) -#define IL_COMP_EXCHGptr InterlockedCompareExchangePointer -#define IL_EXCHG32(X,Y) InterlockedExchange((volatile LONG *)(X),(Y)) -#define IL_EXCHGptr InterlockedExchangePointer -#define make_atomic_add_body(S) \ - v= IL_EXCHG_ADD ## S (a, v) -#define make_atomic_cas_body(S) \ - int ## S initial_cmp= *cmp; \ - int ## S initial_a= IL_COMP_EXCHG ## S (a, set, initial_cmp); \ - if (!(ret= (initial_a == initial_cmp))) *cmp= initial_a; -#define make_atomic_swap_body(S) \ - v= IL_EXCHG ## S (a, v) -#define make_atomic_load_body(S) \ - ret= 0; /* avoid compiler warning */ \ - ret= IL_COMP_EXCHG ## S (a, ret, ret); - -/* - my_yield_processor (equivalent of x86 PAUSE instruction) should be used - to improve performance on hyperthreaded CPUs. Intel recommends to use it in - spin loops also on non-HT machines to reduce power consumption (see e.g - http://softwarecommunity.intel.com/articles/eng/2004.htm) - - Running benchmarks for spinlocks implemented with InterlockedCompareExchange - and YieldProcessor shows that much better performance is achieved by calling - YieldProcessor in a loop - that is, yielding longer. On Intel boxes setting - loop count in the range 200-300 brought best results. - */ -#ifndef YIELD_LOOPS -#define YIELD_LOOPS 200 -#endif - -static __inline int my_yield_processor() -{ - int i; - for(i=0; i<YIELD_LOOPS; i++) - { -#if (_MSC_VER <= 1310) - /* On older compilers YieldProcessor is not available, use inline assembly*/ - __asm { rep nop } -#else - YieldProcessor(); -#endif - } - return 1; -} - -#define LF_BACKOFF my_yield_processor() -#else /* cleanup */ - -#undef IL_EXCHG_ADD32 -#undef IL_COMP_EXCHG32 -#undef IL_COMP_EXCHGptr -#undef IL_EXCHG32 -#undef IL_EXCHGptr - -#endif |