//
//===----------------------------------------------------------------------===//
+#ifndef LLVM_SYSTEM_ATOMIC_H
+#define LLVM_SYSTEM_ATOMIC_H
+
#include "llvm/Config/config.h"
+#include <stdint.h>
#ifdef __APPLE__
-#include <libkern/OSAtomic.h>
+
#elif LLVM_ON_WIN32
#include <windows.h>
#endif
-#ifndef LLVM_SYSTEM_ATOMIC_H
-#define LLVM_SYSTEM_ATOMIC_H
-
namespace llvm {
namespace sys {
- inline void MemoryFence() {
+
#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 UInt32 cas_flag;
+ inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
+ cas_flag old = *dest;
+ OSCompareAndSwap(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
-#warning No memory fence implementation found for you platform!
+#error No memory atomics implementation for your platform!
#endif
- }
+
}
}