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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___CXX03___MUTEX_ONCE_FLAG_H |
| 10 | #define _LIBCPP___CXX03___MUTEX_ONCE_FLAG_H |
| 11 | |
| 12 | #include <__cxx03/__config> |
| 13 | #include <__cxx03/__memory/shared_ptr.h> // __libcpp_acquire_load |
| 14 | #include <__cxx03/__tuple/tuple_indices.h> |
| 15 | #include <__cxx03/__tuple/tuple_size.h> |
| 16 | #include <__cxx03/__type_traits/invoke.h> |
| 17 | #include <__cxx03/__utility/forward.h> |
| 18 | #include <__cxx03/__utility/move.h> |
| 19 | #include <__cxx03/cstdint> |
| 20 | |
| 21 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 22 | # pragma GCC system_header |
| 23 | #endif |
| 24 | |
| 25 | _LIBCPP_PUSH_MACROS |
| 26 | #include <__cxx03/__undef_macros> |
| 27 | |
| 28 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 29 | |
| 30 | struct _LIBCPP_TEMPLATE_VIS once_flag; |
| 31 | |
| 32 | template <class _Callable> |
| 33 | _LIBCPP_HIDE_FROM_ABI void call_once(once_flag&, _Callable&); |
| 34 | |
| 35 | template <class _Callable> |
| 36 | _LIBCPP_HIDE_FROM_ABI void call_once(once_flag&, const _Callable&); |
| 37 | |
| 38 | struct _LIBCPP_TEMPLATE_VIS once_flag { |
| 39 | _LIBCPP_HIDE_FROM_ABI once_flag() _NOEXCEPT : __state_(_Unset) {} |
| 40 | once_flag(const once_flag&) = delete; |
| 41 | once_flag& operator=(const once_flag&) = delete; |
| 42 | |
| 43 | #if defined(_LIBCPP_ABI_MICROSOFT) |
| 44 | typedef uintptr_t _State_type; |
| 45 | #else |
| 46 | typedef unsigned long _State_type; |
| 47 | #endif |
| 48 | |
| 49 | static const _State_type _Unset = 0; |
| 50 | static const _State_type _Pending = 1; |
| 51 | static const _State_type _Complete = ~_State_type(0); |
| 52 | |
| 53 | private: |
| 54 | _State_type __state_; |
| 55 | |
| 56 | template <class _Callable> |
| 57 | friend void call_once(once_flag&, _Callable&); |
| 58 | |
| 59 | template <class _Callable> |
| 60 | friend void call_once(once_flag&, const _Callable&); |
| 61 | }; |
| 62 | |
| 63 | template <class _Fp> |
| 64 | class __call_once_param { |
| 65 | _Fp& __f_; |
| 66 | |
| 67 | public: |
| 68 | _LIBCPP_HIDE_FROM_ABI explicit __call_once_param(_Fp& __f) : __f_(__f) {} |
| 69 | |
| 70 | _LIBCPP_HIDE_FROM_ABI void operator()() { __f_(); } |
| 71 | }; |
| 72 | |
| 73 | template <class _Fp> |
| 74 | void _LIBCPP_HIDE_FROM_ABI __call_once_proxy(void* __vp) { |
| 75 | __call_once_param<_Fp>* __p = static_cast<__call_once_param<_Fp>*>(__vp); |
| 76 | (*__p)(); |
| 77 | } |
| 78 | |
| 79 | _LIBCPP_EXPORTED_FROM_ABI void __call_once(volatile once_flag::_State_type&, void*, void (*)(void*)); |
| 80 | |
| 81 | template <class _Callable> |
| 82 | inline _LIBCPP_HIDE_FROM_ABI void call_once(once_flag& __flag, _Callable& __func) { |
| 83 | if (__libcpp_acquire_load(&__flag.__state_) != once_flag::_Complete) { |
| 84 | __call_once_param<_Callable> __p(__func); |
| 85 | std::__call_once(__flag.__state_, &__p, &__call_once_proxy<_Callable>); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | template <class _Callable> |
| 90 | inline _LIBCPP_HIDE_FROM_ABI void call_once(once_flag& __flag, const _Callable& __func) { |
| 91 | if (__libcpp_acquire_load(&__flag.__state_) != once_flag::_Complete) { |
| 92 | __call_once_param<const _Callable> __p(__func); |
| 93 | std::__call_once(__flag.__state_, &__p, &__call_once_proxy<const _Callable>); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | _LIBCPP_END_NAMESPACE_STD |
| 98 | |
| 99 | _LIBCPP_POP_MACROS |
| 100 | |
| 101 | #endif // _LIBCPP___CXX03___MUTEX_ONCE_FLAG_H |
| 102 |
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