123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
/* -*-c++-*-
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*
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* Copyright (C) 2005-2009,2011 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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#ifdef HAVE_CONFIG_H
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# include <simgear_config.h>
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#endif
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#include "SGAtomic.hxx"
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#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
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#if defined(_WIN32)
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# include <windows.h>
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#elif defined(GCC_ATOMIC_BUILTINS_FOUND)
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#elif defined(__GNUC__) && defined(__i386__)
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#elif defined(SGATOMIC_USE_MUTEX)
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# include <simgear/threads/SGGuard.hxx>
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#else
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# error
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#endif
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unsigned
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SGAtomic::operator++()
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{
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#if defined(_WIN32)
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return InterlockedIncrement(reinterpret_cast<long volatile*>(&mValue));
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#elif defined(GCC_ATOMIC_BUILTINS_FOUND)
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return __sync_add_and_fetch(&mValue, 1);
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#elif defined(__GNUC__) && defined(__i386__)
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register volatile unsigned* mem = reinterpret_cast<volatile unsigned*>(&mValue);
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register unsigned result;
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__asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}"
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: "=r" (result), "=m" (*mem)
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: "0" (1), "m" (*mem)
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: "memory");
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return result + 1;
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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
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SGAtomic::operator--()
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{
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#if defined(_WIN32)
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return InterlockedDecrement(reinterpret_cast<long volatile*>(&mValue));
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#elif defined(GCC_ATOMIC_BUILTINS_FOUND)
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return __sync_sub_and_fetch(&mValue, 1);
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#elif defined(__GNUC__) && defined(__i386__)
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register volatile unsigned* mem = reinterpret_cast<volatile unsigned*>(&mValue);
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register unsigned result;
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__asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}"
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: "=r" (result), "=m" (*mem)
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: "0" (-1), "m" (*mem)
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: "memory");
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return result - 1;
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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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SGAtomic::operator unsigned() const
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{
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#if defined(_WIN32)
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return static_cast<unsigned const volatile &>(mValue);
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#elif defined(GCC_ATOMIC_BUILTINS_FOUND)
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__sync_synchronize();
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return mValue;
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#elif defined(__GNUC__) && defined(__i386__)
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__asm__ __volatile__("": : : "memory");
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return 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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bool
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SGAtomic::compareAndExchange(unsigned oldValue, unsigned newValue)
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{
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#if defined(_WIN32)
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long volatile* lvPtr = reinterpret_cast<long volatile*>(&mValue);
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return oldValue == InterlockedCompareExchange(lvPtr, newValue, oldValue);
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#elif defined(GCC_ATOMIC_BUILTINS_FOUND)
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return __sync_bool_compare_and_swap(&mValue, oldValue, newValue);
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#elif defined(__GNUC__) && defined(__i386__)
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register volatile unsigned* mem = reinterpret_cast<volatile unsigned*>(&mValue);
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unsigned before;
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__asm__ __volatile__("lock; cmpxchg{l} {%1,%2|%1,%2}"
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: "=a"(before)
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: "q"(newValue), "m"(*mem), "0"(oldValue)
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: "memory");
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return before == oldValue;
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#else
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SGGuard<SGMutex> lock(mMutex);
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if (mValue != oldValue)
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return false;
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mValue = newValue;
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return true;
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#endif
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}
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#endif
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