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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___CUDA_ATOMIC_H
#define _LIBCUDACXX___CUDA_ATOMIC_H
#ifndef __cuda_std__
#error "<__cuda/atomic> should only be included in from <cuda/std/atomic>"
#endif // __cuda_std__
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_CUDA
using std::__detail::thread_scope;
using std::__detail::thread_scope_system;
using std::__detail::thread_scope_device;
using std::__detail::thread_scope_block;
using std::__detail::thread_scope_thread;
namespace __detail {
using std::__detail::__thread_scope_block_tag;
using std::__detail::__thread_scope_device_tag;
using std::__detail::__thread_scope_system_tag;
}
using memory_order = std::memory_order;
constexpr memory_order memory_order_relaxed = std::memory_order_relaxed;
constexpr memory_order memory_order_consume = std::memory_order_consume;
constexpr memory_order memory_order_acquire = std::memory_order_acquire;
constexpr memory_order memory_order_release = std::memory_order_release;
constexpr memory_order memory_order_acq_rel = std::memory_order_acq_rel;
constexpr memory_order memory_order_seq_cst = std::memory_order_seq_cst;
// atomic<T>
template <class _Tp, thread_scope _Sco = thread_scope::thread_scope_system>
struct atomic
: public std::__atomic_base<_Tp, _Sco>
{
typedef std::__atomic_base<_Tp, _Sco> __base;
constexpr atomic() noexcept = default;
_LIBCUDACXX_HOST_DEVICE
constexpr atomic(_Tp __d) noexcept : __base(__d) {}
_LIBCUDACXX_HOST_DEVICE
_Tp operator=(_Tp __d) volatile noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp operator=(_Tp __d) noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp fetch_max(const _Tp & __op, memory_order __m = memory_order_seq_cst) volatile noexcept
{
return std::__detail::__cxx_atomic_fetch_max(&this->__a_, __op, __m);
}
_LIBCUDACXX_HOST_DEVICE
_Tp fetch_min(const _Tp & __op, memory_order __m = memory_order_seq_cst) volatile noexcept
{
return std::__detail::__cxx_atomic_fetch_min(&this->__a_, __op, __m);
}
};
// atomic<T*>
template <class _Tp, thread_scope _Sco>
struct atomic<_Tp*, _Sco>
: public std::__atomic_base<_Tp*, _Sco>
{
typedef std::__atomic_base<_Tp*, _Sco> __base;
constexpr atomic() noexcept = default;
_LIBCUDACXX_HOST_DEVICE
constexpr atomic(_Tp* __d) noexcept : __base(__d) {}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator=(_Tp* __d) volatile noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator=(_Tp* __d) noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst)
volatile noexcept
{return __cxx_atomic_fetch_add(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) noexcept
{return __cxx_atomic_fetch_add(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst)
volatile noexcept
{return __cxx_atomic_fetch_sub(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) noexcept
{return __cxx_atomic_fetch_sub(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++(int) volatile noexcept {return fetch_add(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++(int) noexcept {return fetch_add(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--(int) volatile noexcept {return fetch_sub(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--(int) noexcept {return fetch_sub(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++() volatile noexcept {return fetch_add(1) + 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++() noexcept {return fetch_add(1) + 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--() volatile noexcept {return fetch_sub(1) - 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--() noexcept {return fetch_sub(1) - 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator+=(ptrdiff_t __op) volatile noexcept {return fetch_add(__op) + __op;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator+=(ptrdiff_t __op) noexcept {return fetch_add(__op) + __op;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator-=(ptrdiff_t __op) volatile noexcept {return fetch_sub(__op) - __op;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator-=(ptrdiff_t __op) noexcept {return fetch_sub(__op) - __op;}
};
// atomic_ref<T>
template <class _Tp, thread_scope _Sco = thread_scope::thread_scope_system>
struct atomic_ref
: public std::__atomic_base_ref<_Tp, _Sco>
{
typedef std::__atomic_base_ref<_Tp, _Sco> __base;
_LIBCUDACXX_HOST_DEVICE
constexpr atomic_ref(_Tp& __d) noexcept : __base(__d) {}
_LIBCUDACXX_HOST_DEVICE
_Tp operator=(_Tp __d) const volatile noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp operator=(_Tp __d) const noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp fetch_max(const _Tp & __op, memory_order __m = memory_order_seq_cst) const volatile noexcept
{
return std::__detail::__cxx_atomic_fetch_max(&this->__a_, __op, __m);
}
_LIBCUDACXX_HOST_DEVICE
_Tp fetch_min(const _Tp & __op, memory_order __m = memory_order_seq_cst) const volatile noexcept
{
return std::__detail::__cxx_atomic_fetch_min(&this->__a_, __op, __m);
}
};
// atomic_ref<T*>
template <class _Tp, thread_scope _Sco>
struct atomic_ref<_Tp*, _Sco>
: public std::__atomic_base_ref<_Tp*, _Sco>
{
typedef std::__atomic_base_ref<_Tp*, _Sco> __base;
_LIBCUDACXX_HOST_DEVICE
constexpr atomic_ref(_Tp*& __d) noexcept : __base(__d) {}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator=(_Tp* __d) const volatile noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator=(_Tp* __d) const noexcept
{__base::store(__d); return __d;}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_add(ptrdiff_t __op,
memory_order __m = memory_order_seq_cst) const volatile noexcept
{return __cxx_atomic_fetch_add(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_add(ptrdiff_t __op,
memory_order __m = memory_order_seq_cst) const noexcept
{return __cxx_atomic_fetch_add(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_sub(ptrdiff_t __op,
memory_order __m = memory_order_seq_cst) const volatile noexcept
{return __cxx_atomic_fetch_sub(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* fetch_sub(ptrdiff_t __op,
memory_order __m = memory_order_seq_cst) const noexcept
{return __cxx_atomic_fetch_sub(&this->__a_, __op, __m);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++(int) const volatile noexcept {return fetch_add(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++(int) const noexcept {return fetch_add(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--(int) const volatile noexcept {return fetch_sub(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--(int) const noexcept {return fetch_sub(1);}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++() const volatile noexcept {return fetch_add(1) + 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator++() const noexcept {return fetch_add(1) + 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--() const volatile noexcept {return fetch_sub(1) - 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator--() const noexcept {return fetch_sub(1) - 1;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator+=(ptrdiff_t __op) const volatile noexcept {return fetch_add(__op) + __op;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator+=(ptrdiff_t __op) const noexcept {return fetch_add(__op) + __op;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator-=(ptrdiff_t __op) const volatile noexcept {return fetch_sub(__op) - __op;}
_LIBCUDACXX_HOST_DEVICE
_Tp* operator-=(ptrdiff_t __op) const noexcept {return fetch_sub(__op) - __op;}
};
inline _LIBCUDACXX_HOST_DEVICE void atomic_thread_fence(memory_order __m, thread_scope _Scope = thread_scope::thread_scope_system) {
NV_DISPATCH_TARGET(
NV_IS_DEVICE, (
switch(_Scope) {
case thread_scope::thread_scope_system:
std::__detail::__atomic_thread_fence_cuda((int)__m, __detail::__thread_scope_system_tag());
break;
case thread_scope::thread_scope_device:
std::__detail::__atomic_thread_fence_cuda((int)__m, __detail::__thread_scope_device_tag());
break;
case thread_scope::thread_scope_block:
std::__detail::__atomic_thread_fence_cuda((int)__m, __detail::__thread_scope_block_tag());
break;
// Atomics scoped to themselves do not require fencing
case thread_scope::thread_scope_thread:
break;
}
),
NV_IS_HOST, (
(void) _Scope;
std::atomic_thread_fence(__m);
)
)
}
inline _LIBCUDACXX_HOST_DEVICE void atomic_signal_fence(memory_order __m) {
std::atomic_signal_fence(__m);
}
_LIBCUDACXX_END_NAMESPACE_CUDA
#endif // _LIBCUDACXX___CUDA_ATOMIC_H
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