mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 19:52:54 +01:00
52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
//===-- Atomic.cpp - 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 header file implements atomic operations.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/System/Atomic.h"
|
|
#include "llvm/Config/config.h"
|
|
|
|
using namespace llvm;
|
|
|
|
#if defined(_MSC_VER)
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
void sys::MemoryFence() {
|
|
#if LLVM_MULTITHREADED==0
|
|
return;
|
|
#else
|
|
# if defined(__GNUC__)
|
|
__sync_synchronize();
|
|
# elif defined(_MSC_VER)
|
|
MemoryBarrier();
|
|
# else
|
|
# error No memory fence implementation for your platform!
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
|
|
sys::cas_flag new_value,
|
|
sys::cas_flag old_value) {
|
|
#if LLVM_MULTITHREADED==0
|
|
sys::cas_flag result = *ptr;
|
|
if (result == old_value)
|
|
*ptr = new_value;
|
|
return result;
|
|
#elif defined(__GNUC__)
|
|
return __sync_val_compare_and_swap(ptr, old_value, new_value);
|
|
#elif defined(_MSC_VER)
|
|
return InterlockedCompareExchange(ptr, new_value, old_value);
|
|
#else
|
|
# error No compare-and-swap implementation for your platform!
|
|
#endif
|
|
} |