derek.holloway
7502bf64a4
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62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of libcu++, the C++ Standard Library for your entire system,
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// under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCUDACXX___ATOMIC_WAIT_POLLING_H
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#define _LIBCUDACXX___ATOMIC_WAIT_POLLING_H
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#include <cuda/std/detail/__config>
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#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
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# pragma GCC system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
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# pragma clang system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
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# pragma system_header
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#endif // no system header
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#include <cuda/std/__atomic/order.h>
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#include <cuda/std/__atomic/scopes.h>
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#include <cuda/std/__atomic/types.h>
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#include <cuda/std/__thread/threading_support.h>
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_LIBCUDACXX_BEGIN_NAMESPACE_STD
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template <typename _Tp, typename _Sco>
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struct __atomic_poll_tester
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{
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using __underlying_t = __atomic_underlying_remove_cv_t<_Tp>;
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_Tp const volatile* __atom;
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__underlying_t __val;
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memory_order __order;
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_CCCL_HOST_DEVICE __atomic_poll_tester(_Tp const volatile* __a, __underlying_t __v, memory_order __o)
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: __atom(__a)
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, __val(__v)
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, __order(__o)
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{}
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_CCCL_HOST_DEVICE bool operator()() const
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{
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return !(__atomic_load_dispatch(__atom, __order, _Sco{}) == __val);
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}
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};
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template <typename _Tp, typename _Sco>
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_CCCL_HOST_DEVICE void __atomic_try_wait_slow_fallback(
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_Tp const volatile* __a, __atomic_underlying_remove_cv_t<_Tp> __val, memory_order __order, _Sco)
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{
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_CUDA_VSTD::__cccl_thread_poll_with_backoff(__atomic_poll_tester<_Tp, _Sco>(__a, __val, __order));
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}
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_LIBCUDACXX_END_NAMESPACE_STD
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#endif // _LIBCUDACXX___ATOMIC_WAIT_POLLING_H
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