Mercurial > sdl-ios-xcode
view src/atomic/SDL_spinlock.c @ 5076:8bf5781fc582
Fixed size_t warnings on 64-bit build
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 22 Jan 2011 15:58:21 -0800 |
parents | 1e94e68525d5 |
children | c2539ff054c8 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 Sam Lantinga 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 2.1 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; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_stdinc.h" #include "SDL_atomic.h" #include "SDL_timer.h" /* Don't do the check for Visual Studio 2005, it's safe here */ #if defined(_MSC_VER) #include <intrin.h> #endif /* This function is where all the magic happens... */ SDL_bool SDL_AtomicTryLock(SDL_SpinLock *lock) { #if defined(_MSC_VER) SDL_COMPILE_TIME_ASSERT(locksize, sizeof(*lock) == sizeof(long)); return (_InterlockedExchange((long*)lock, 1) == 0); #elif defined(__MACOSX__) return OSAtomicCompareAndSwap32Barrier(0, 1, lock); #elif defined(HAVE_GCC_ATOMICS) || defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET) return (__sync_lock_test_and_set(lock, 1) == 0); #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__) int result; __asm__ __volatile__ ( "swp %0, %1, [%2]\n" : "=&r,&r" (result) : "r,0" (1), "r,r" (lock) : "memory"); return (result == 0); #elif defined(__GNUC__) && defined(__arm__) int result; __asm__ __volatile__ ( "ldrex %0, [%2]\nteq %0, #0\nstrexeq %0, %1, [%2]" : "=&r" (result) : "r" (1), "r" (lock) : "cc", "memory"); return (result == 0); #else /* Need CPU instructions for spinlock here! */ __need_spinlock_implementation__ #endif } void SDL_AtomicLock(SDL_SpinLock *lock) { /* FIXME: Should we have an eventual timeout? */ while (!SDL_AtomicTryLock(lock)) { SDL_Delay(0); } } void SDL_AtomicUnlock(SDL_SpinLock *lock) { /* Assuming atomic assignment operation and full memory barrier in lock */ *lock = 0; } /* vi: set ts=4 sw=4 expandtab: */