llvm-6502/include/llvm/System/Atomic.h
Owen Anderson 8064c8b86d (Hopefully) unbreak Apple-style builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71849 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-15 06:49:31 +00:00

82 lines
2.1 KiB
C++

//===- llvm/System/Atomic.h - Atomic Operations -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the llvm::sys atomic operations.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_ATOMIC_H
#define LLVM_SYSTEM_ATOMIC_H
#include <stdint.h>
#if defined(__APPLE__)
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ == 0)
#include <libkern/OSAtomic.h>
#endif
#elif LLVM_ON_WIN32
#include <windows.h>
#endif
namespace llvm {
namespace sys {
#if !defined(ENABLE_THREADS) || ENABLE_THREADS == 0
inline void MemoryFence() {
return;
}
typedef uint32_t cas_flag;
inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
cas_flag result = *dest;
if (result == c)
*dest = exc;
return result;
}
#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
inline void MemoryFence() {
__sync_synchronize();
}
typedef volatile uint32_t cas_flag;
inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
return __sync_val_compare_and_swap(dest, exc, c);
}
#elif defined(__APPLE__)
inline void MemoryFence() {
OSMemoryBarrier();
}
typedef volatile int32_t cas_flag;
inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
cas_flag old = *dest;
OSAtomicCompareAndSwap32(c, exc, dest);
return old;
}
#elif defined(LLVM_ON_WIN32)
#warning Memory fence implementation requires Windows 2003 or later.
inline void MemoryFence() {
MemoryBarrier();
}
typedef volatile long cas_flag;
inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
return _InterlockedCompareExchange(dest, exc, c);
}
#else
#error No memory atomics implementation for your platform!
#endif
}
}
#endif