mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-13 07:29:38 +00:00
a86037084d
mutex support. LLVM_MULTITHREADED indicates (or will indicate) the ability to run LLVM itself across multiple threads, and requires atomics support. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72140 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.1 KiB
C++
87 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
|
|
|
|
#if defined(_MSC_VER)
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
|
|
namespace llvm {
|
|
namespace sys {
|
|
|
|
inline void 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
|
|
}
|
|
|
|
#if LLVM_MULTITHREADED==0
|
|
typedef unsigned long cas_flag;
|
|
template<typename T>
|
|
inline T CompareAndSwap(volatile T* dest,
|
|
T exc, T c) {
|
|
T result = *dest;
|
|
if (result == c)
|
|
*dest = exc;
|
|
return result;
|
|
}
|
|
#elif defined(__GNUC__)
|
|
typedef unsigned long cas_flag;
|
|
template<typename T>
|
|
inline T CompareAndSwap(volatile T* ptr,
|
|
T new_value,
|
|
T old_value) {
|
|
return __sync_val_compare_and_swap(ptr, old_value, new_value);
|
|
}
|
|
#elif defined(_MSC_VER)
|
|
typedef LONG cas_flag;
|
|
template<typename T>
|
|
inline T CompareAndSwap(volatile T* ptr,
|
|
T new_value,
|
|
T old_value) {
|
|
if (sizeof(T) == 4)
|
|
return InterlockedCompareExchange(ptr, new_value, old_value);
|
|
else if (sizeof(T) == 8)
|
|
return InterlockedCompareExchange64(ptr, new_value, old_value);
|
|
else
|
|
assert(0 && "Unsupported compare-and-swap size!");
|
|
}
|
|
|
|
template<typename T>
|
|
inline T* CompareAndSwap<T*>(volatile T** ptr,
|
|
T* new_value,
|
|
T* old_value) {
|
|
return InterlockedCompareExchangePtr(ptr, new_value, old_value);
|
|
}
|
|
|
|
|
|
#else
|
|
# error No compare-and-swap implementation for your platform!
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
#endif
|