durk
0c8358ae67
* on cygwin, isnan is declared in ieeepf.h
* CYGWIN is a special case in that it is windows based, but sometimes
folows unix conventions. SGAtomic compilation failed on an illegal
volatile type cast without the additional __CYGWIN__ define check.
102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
/* -*-c++-*-
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*
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* Copyright (C) 2005-2006 Mathias Froehlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SGAtomic_HXX
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#define SGAtomic_HXX
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#if defined(__GNUC__) && (4 <= __GNUC__) && (1 <= __GNUC_MINOR__) \
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&& (defined(__i386__) || defined(__x86_64__))
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// No need to include something. Is a Compiler API ...
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# define SGATOMIC_USE_GCC4_BUILTINS
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#elif defined(__sgi) && defined(_COMPILER_VERSION) && (_COMPILER_VERSION>=730)
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// No need to include something. Is a Compiler API ...
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# define SGATOMIC_USE_MIPSPRO_BUILTINS
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#elif defined(WIN32) && !defined ( __CYGWIN__ )
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# include <windows.h>
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# define SGATOMIC_USE_WIN32_INTERLOCKED
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#else
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// The sledge hammer ...
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# include <simgear/threads/SGThread.hxx>
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# include <simgear/threads/SGGuard.hxx>
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#endif
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class SGAtomic {
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public:
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SGAtomic(unsigned value = 0) : mValue(value)
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{ }
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unsigned operator++()
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{
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#if defined(SGATOMIC_USE_GCC4_BUILTINS)
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return __sync_add_and_fetch(&mValue, 1);
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#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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return __add_and_fetch(&mValue, 1);
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#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED)
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return InterlockedIncrement(reinterpret_cast<long volatile*>(&mValue));
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#else
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SGGuard<SGMutex> lock(mMutex);
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return ++mValue;
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#endif
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}
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unsigned operator--()
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{
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#if defined(SGATOMIC_USE_GCC4_BUILTINS)
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return __sync_sub_and_fetch(&mValue, 1);
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#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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return __sub_and_fetch(&mValue, 1);
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#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED)
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return InterlockedDecrement(reinterpret_cast<long volatile*>(&mValue));
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#else
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SGGuard<SGMutex> lock(mMutex);
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return --mValue;
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#endif
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}
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operator unsigned() const
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{
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#if defined(SGATOMIC_USE_GCC4_BUILTINS)
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__sync_synchronize();
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return mValue;
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#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
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__synchronize();
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return mValue;
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#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED)
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return static_cast<unsigned const volatile &>(mValue);
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#else
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SGGuard<SGMutex> lock(mMutex);
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return mValue;
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#endif
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}
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private:
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SGAtomic(const SGAtomic&);
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SGAtomic& operator=(const SGAtomic&);
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#if !defined(SGATOMIC_USE_GCC4_BUILTINS) \
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&& !defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) \
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&& !defined(SGATOMIC_USE_WIN32_INTERLOCKED)
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mutable SGMutex mMutex;
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#endif
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#ifdef SGATOMIC_USE_WIN32_INTERLOCKED
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__declspec(align(32))
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#endif
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unsigned mValue;
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};
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#endif
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