From 83772c87ac3f4dc8d18a8a4e9a28948ba8b2037c Mon Sep 17 00:00:00 2001 From: Mathias Froehlich Date: Sun, 23 Oct 2011 23:03:15 +0200 Subject: [PATCH] Rework SGAtomic, move more into the implementation. Mainly move many cases into the implementation file. --- simgear/structure/SGAtomic.cxx | 120 ++++++++++++++++++++++----------- simgear/structure/SGAtomic.hxx | 88 ++++++++++++------------ 2 files changed, 127 insertions(+), 81 deletions(-) diff --git a/simgear/structure/SGAtomic.cxx b/simgear/structure/SGAtomic.cxx index 3f0b9f44..68fcf775 100644 --- a/simgear/structure/SGAtomic.cxx +++ b/simgear/structure/SGAtomic.cxx @@ -1,6 +1,6 @@ /* -*-c++-*- * - * Copyright (C) 2005-2009 Mathias Froehlich + * Copyright (C) 2005-2009,2011 Mathias Froehlich * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -17,62 +17,104 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * */ + #ifdef HAVE_CONFIG_H # include #endif #include "SGAtomic.hxx" -#if defined(SGATOMIC_USE_GCC4_BUILTINS) && !defined (GCC_ATOMIC_BUILTINS_FOUND) - -// Usually the appropriate functions are inlined by gcc. -// But if gcc is called with something equivalent to -march=i386, -// it will not assume that there is a lock instruction and instead -// calls this pair of functions. We will provide them here in this case. -// Note that this assembler code will not work on a i386 chip anymore. -// But I firmly believe that we can assume to run at least on a i486 ... +#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS) -extern "C" { +#if defined(_WIN32) +# include +#elif defined(GCC_ATOMIC_BUILTINS_FOUND) +#elif defined(__GNUC__) && defined(__i386__) +#else +# include +#endif -unsigned __sync_sub_and_fetch_4(volatile void *ptr, unsigned value) +unsigned +SGAtomic::operator++() { - register volatile unsigned* mem = reinterpret_cast(ptr); - register unsigned result; - __asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}" - : "=r" (result), "=m" (*mem) - : "0" (-value), "m" (*mem) - : "memory"); - return result - value; +#if defined(_WIN32) + return InterlockedIncrement(reinterpret_cast(&mValue)); +#elif defined(GCC_ATOMIC_BUILTINS_FOUND) + return __sync_add_and_fetch(&mValue, 1); +#elif defined(__GNUC__) && defined(__i386__) + register volatile unsigned* mem = reinterpret_cast(&mValue); + register unsigned result; + __asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}" + : "=r" (result), "=m" (*mem) + : "0" (1), "m" (*mem) + : "memory"); + return result + 1; +#else + SGGuard lock(mMutex); + return ++mValue; +#endif } -unsigned __sync_add_and_fetch_4(volatile void *ptr, unsigned value) +unsigned +SGAtomic::operator--() { - register volatile unsigned* mem = reinterpret_cast(ptr); - register unsigned result; - __asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}" - : "=r" (result), "=m" (*mem) - : "0" (value), "m" (*mem) - : "memory"); - return result + value; +#if defined(_WIN32) + return InterlockedDecrement(reinterpret_cast(&mValue)); +#elif defined(GCC_ATOMIC_BUILTINS_FOUND) + return __sync_sub_and_fetch(&mValue, 1); +#elif defined(__GNUC__) && defined(__i386__) + register volatile unsigned* mem = reinterpret_cast(&mValue); + register unsigned result; + __asm__ __volatile__("lock; xadd{l} {%0,%1|%1,%0}" + : "=r" (result), "=m" (*mem) + : "0" (-1), "m" (*mem) + : "memory"); + return result - 1; +#else + SGGuard lock(mMutex); + return --mValue; +#endif } -unsigned __sync_bool_compare_and_swap_4(volatile void *ptr, - unsigned oldValue, unsigned newValue) +SGAtomic::operator unsigned() const { - register volatile unsigned* mem = reinterpret_cast(ptr); - unsigned before; - __asm__ __volatile__("lock; cmpxchg{l} {%1,%2|%1,%2}" - : "=a"(before) - : "q"(newValue), "m"(*mem), "0"(oldValue) - : "memory"); - return before == oldValue; +#if defined(_WIN32) + return static_cast(mValue); +#elif defined(GCC_ATOMIC_BUILTINS_FOUND) + __sync_synchronize(); + return mValue; +#elif defined(__GNUC__) && defined(__i386__) + __asm__ __volatile__("": : : "memory"); + return mValue; +#else + SGGuard lock(mMutex); + return mValue; +#endif } -void __sync_synchronize() +bool +SGAtomic::compareAndExchange(unsigned oldValue, unsigned newValue) { - __asm__ __volatile__("": : : "memory"); +#if defined(_WIN32) + long volatile* lvPtr = reinterpret_cast(&mValue); + return oldValue == InterlockedCompareExchange(lvPtr, newValue, oldValue); +#elif defined(GCC_ATOMIC_BUILTINS_FOUND) + return __sync_bool_compare_and_swap(&mValue, oldValue, newValue); +#elif defined(__GNUC__) && defined(__i386__) + register volatile unsigned* mem = reinterpret_cast(&mValue); + unsigned before; + __asm__ __volatile__("lock; cmpxchg{l} {%1,%2|%1,%2}" + : "=a"(before) + : "q"(newValue), "m"(*mem), "0"(oldValue) + : "memory"); + return before == oldValue; +#else + SGGuard lock(mMutex); + if (mValue != oldValue) + return false; + mValue = newValue; + return true; +#endif } -} // extern "C" - #endif diff --git a/simgear/structure/SGAtomic.hxx b/simgear/structure/SGAtomic.hxx index 081a4906..91bb262e 100644 --- a/simgear/structure/SGAtomic.hxx +++ b/simgear/structure/SGAtomic.hxx @@ -1,6 +1,6 @@ /* -*-c++-*- * - * Copyright (C) 2005-2009 Mathias Froehlich + * Copyright (C) 2005-2009,2011 Mathias Froehlich * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as @@ -21,85 +21,89 @@ #ifndef SGAtomic_HXX #define SGAtomic_HXX -#if defined(__GNUC__) && ((4 < __GNUC__)||(4 == __GNUC__ && 1 <= __GNUC_MINOR__)) \ - && (defined(__i386__) || defined(__x86_64__)) +#if defined(__GNUC__) && ((4 < __GNUC__)||(4 == __GNUC__ && 1 <= __GNUC_MINOR__)) && \ + defined(__x86_64__) // No need to include something. Is a Compiler API ... # define SGATOMIC_USE_GCC4_BUILTINS +#elif defined(__GNUC__) && defined(__i386__) +# define SGATOMIC_USE_LIBRARY_FUNCTIONS #elif defined(__sgi) && defined(_COMPILER_VERSION) && (_COMPILER_VERSION>=730) // No need to include something. Is a Compiler API ... # define SGATOMIC_USE_MIPSPRO_BUILTINS #elif defined(_WIN32) -# include -# define SGATOMIC_USE_WIN32_INTERLOCKED +# define SGATOMIC_USE_LIBRARY_FUNCTIONS #else // The sledge hammer ... +# define SGATOMIC_USE_LIBRARY_FUNCTIONS # include -# include #endif class SGAtomic { public: SGAtomic(unsigned value = 0) : mValue(value) { } + +#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS) + unsigned operator++(); +#else unsigned operator++() { -#if defined(SGATOMIC_USE_GCC4_BUILTINS) +# if defined(SGATOMIC_USE_GCC4_BUILTINS) return __sync_add_and_fetch(&mValue, 1); -#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) +# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) return __add_and_fetch(&mValue, 1); -#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED) - return InterlockedIncrement(reinterpret_cast(&mValue)); -#else - SGGuard lock(mMutex); - return ++mValue; -#endif +# else +# error +# endif } +#endif + +#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS) + unsigned operator--(); +#else unsigned operator--() { -#if defined(SGATOMIC_USE_GCC4_BUILTINS) +# if defined(SGATOMIC_USE_GCC4_BUILTINS) return __sync_sub_and_fetch(&mValue, 1); -#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) +# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) return __sub_and_fetch(&mValue, 1); -#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED) - return InterlockedDecrement(reinterpret_cast(&mValue)); -#else - SGGuard lock(mMutex); - return --mValue; -#endif +# else +# error +# endif } +#endif + +#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS) + operator unsigned() const; +#else operator unsigned() const { -#if defined(SGATOMIC_USE_GCC4_BUILTINS) +# if defined(SGATOMIC_USE_GCC4_BUILTINS) __sync_synchronize(); return mValue; -#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) +# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) __synchronize(); return mValue; -#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED) - return static_cast(mValue); -#else - SGGuard lock(mMutex); - return mValue; -#endif +# else +# error +# endif } +#endif +#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS) + bool compareAndExchange(unsigned oldValue, unsigned newValue); +#else bool compareAndExchange(unsigned oldValue, unsigned newValue) { -#if defined(SGATOMIC_USE_GCC4_BUILTINS) +# if defined(SGATOMIC_USE_GCC4_BUILTINS) return __sync_bool_compare_and_swap(&mValue, oldValue, newValue); -#elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) +# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS) return __compare_and_swap(&mValue, oldValue, newValue); -#elif defined(SGATOMIC_USE_WIN32_INTERLOCKED) - long volatile* lvPtr = reinterpret_cast(&mValue); - return oldValue == InterlockedCompareExchange(lvPtr, newValue, oldValue); -#else - SGGuard lock(mMutex); - if (mValue != oldValue) - return false; - mValue = newValue; - return true; -#endif +# else +# error +# endif } +#endif private: SGAtomic(const SGAtomic&); -- 2.39.5