//
// This file declares the llvm::sys atomic operations.
//
+// DO NOT USE IN NEW CODE!
+//
+// New code should always rely on the std::atomic facilities in C++11.
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_ATOMIC_H
cas_flag CompareAndSwap(volatile cas_flag* ptr,
cas_flag new_value,
cas_flag old_value);
- cas_flag AtomicIncrement(volatile cas_flag* ptr);
- cas_flag AtomicDecrement(volatile cas_flag* ptr);
- cas_flag AtomicAdd(volatile cas_flag* ptr, cas_flag val);
- cas_flag AtomicMul(volatile cas_flag* ptr, cas_flag val);
- cas_flag AtomicDiv(volatile cas_flag* ptr, cas_flag val);
}
}
# error No compare-and-swap implementation for your platform!
#endif
}
-
-sys::cas_flag sys::AtomicIncrement(volatile sys::cas_flag* ptr) {
-#if LLVM_HAS_ATOMICS == 0
- ++(*ptr);
- return *ptr;
-#elif defined(GNU_ATOMICS)
- return __sync_add_and_fetch(ptr, 1);
-#elif defined(_MSC_VER)
- return InterlockedIncrement(ptr);
-#else
-# error No atomic increment implementation for your platform!
-#endif
-}
-
-sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
-#if LLVM_HAS_ATOMICS == 0
- --(*ptr);
- return *ptr;
-#elif defined(GNU_ATOMICS)
- return __sync_sub_and_fetch(ptr, 1);
-#elif defined(_MSC_VER)
- return InterlockedDecrement(ptr);
-#else
-# error No atomic decrement implementation for your platform!
-#endif
-}
-
-sys::cas_flag sys::AtomicAdd(volatile sys::cas_flag* ptr, sys::cas_flag val) {
-#if LLVM_HAS_ATOMICS == 0
- *ptr += val;
- return *ptr;
-#elif defined(GNU_ATOMICS)
- return __sync_add_and_fetch(ptr, val);
-#elif defined(_MSC_VER)
- return InterlockedExchangeAdd(ptr, val) + val;
-#else
-# error No atomic add implementation for your platform!
-#endif
-}
-
-sys::cas_flag sys::AtomicMul(volatile sys::cas_flag* ptr, sys::cas_flag val) {
- sys::cas_flag original, result;
- do {
- original = *ptr;
- result = original * val;
- } while (sys::CompareAndSwap(ptr, result, original) != original);
-
- return result;
-}
-
-sys::cas_flag sys::AtomicDiv(volatile sys::cas_flag* ptr, sys::cas_flag val) {
- sys::cas_flag original, result;
- do {
- original = *ptr;
- result = original / val;
- } while (sys::CompareAndSwap(ptr, result, original) != original);
-
- return result;
-}