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1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___CXX03___THREAD_THREAD_H
11#define _LIBCPP___CXX03___THREAD_THREAD_H
12
13#include <__cxx03/__condition_variable/condition_variable.h>
14#include <__cxx03/__config>
15#include <__cxx03/__exception/terminate.h>
16#include <__cxx03/__functional/hash.h>
17#include <__cxx03/__functional/unary_function.h>
18#include <__cxx03/__memory/unique_ptr.h>
19#include <__cxx03/__mutex/mutex.h>
20#include <__cxx03/__system_error/system_error.h>
21#include <__cxx03/__thread/id.h>
22#include <__cxx03/__thread/support.h>
23#include <__cxx03/__utility/forward.h>
24
25#ifndef _LIBCPP_HAS_NO_LOCALIZATION
26# include <__cxx03/locale>
27# include <__cxx03/sstream>
28#endif
29
30#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
31# pragma GCC system_header
32#endif
33
34_LIBCPP_PUSH_MACROS
35#include <__cxx03/__undef_macros>
36
37_LIBCPP_BEGIN_NAMESPACE_STD
38
39template <class _Tp>
40class __thread_specific_ptr;
41class _LIBCPP_EXPORTED_FROM_ABI __thread_struct;
42class _LIBCPP_HIDDEN __thread_struct_imp;
43class __assoc_sub_state;
44
45_LIBCPP_EXPORTED_FROM_ABI __thread_specific_ptr<__thread_struct>& __thread_local_data();
46
47class _LIBCPP_EXPORTED_FROM_ABI __thread_struct {
48 __thread_struct_imp* __p_;
49
50 __thread_struct(const __thread_struct&);
51 __thread_struct& operator=(const __thread_struct&);
52
53public:
54 __thread_struct();
55 ~__thread_struct();
56
57 void notify_all_at_thread_exit(condition_variable*, mutex*);
58 void __make_ready_at_thread_exit(__assoc_sub_state*);
59};
60
61template <class _Tp>
62class __thread_specific_ptr {
63 __libcpp_tls_key __key_;
64
65 // Only __thread_local_data() may construct a __thread_specific_ptr
66 // and only with _Tp == __thread_struct.
67 static_assert(is_same<_Tp, __thread_struct>::value, "");
68 __thread_specific_ptr();
69 friend _LIBCPP_EXPORTED_FROM_ABI __thread_specific_ptr<__thread_struct>& __thread_local_data();
70
71 _LIBCPP_HIDDEN static void _LIBCPP_TLS_DESTRUCTOR_CC __at_thread_exit(void*);
72
73public:
74 typedef _Tp* pointer;
75
76 __thread_specific_ptr(const __thread_specific_ptr&) = delete;
77 __thread_specific_ptr& operator=(const __thread_specific_ptr&) = delete;
78 ~__thread_specific_ptr();
79
80 _LIBCPP_HIDE_FROM_ABI pointer get() const { return static_cast<_Tp*>(__libcpp_tls_get(__key_)); }
81 _LIBCPP_HIDE_FROM_ABI pointer operator*() const { return *get(); }
82 _LIBCPP_HIDE_FROM_ABI pointer operator->() const { return get(); }
83 void set_pointer(pointer __p);
84};
85
86template <class _Tp>
87void _LIBCPP_TLS_DESTRUCTOR_CC __thread_specific_ptr<_Tp>::__at_thread_exit(void* __p) {
88 delete static_cast<pointer>(__p);
89}
90
91template <class _Tp>
92__thread_specific_ptr<_Tp>::__thread_specific_ptr() {
93 int __ec = __libcpp_tls_create(&__key_, &__thread_specific_ptr::__at_thread_exit);
94 if (__ec)
95 __throw_system_error(__ec, "__thread_specific_ptr construction failed");
96}
97
98template <class _Tp>
99__thread_specific_ptr<_Tp>::~__thread_specific_ptr() {
100 // __thread_specific_ptr is only created with a static storage duration
101 // so this destructor is only invoked during program termination. Invoking
102 // pthread_key_delete(__key_) may prevent other threads from deleting their
103 // thread local data. For this reason we leak the key.
104}
105
106template <class _Tp>
107void __thread_specific_ptr<_Tp>::set_pointer(pointer __p) {
108 _LIBCPP_ASSERT_INTERNAL(get() == nullptr, "Attempting to overwrite thread local data");
109 std::__libcpp_tls_set(__key_, __p);
110}
111
112template <>
113struct _LIBCPP_TEMPLATE_VIS hash<__thread_id> : public __unary_function<__thread_id, size_t> {
114 _LIBCPP_HIDE_FROM_ABI size_t operator()(__thread_id __v) const _NOEXCEPT {
115 return hash<__libcpp_thread_id>()(__v.__id_);
116 }
117};
118
119#ifndef _LIBCPP_HAS_NO_LOCALIZATION
120template <class _CharT, class _Traits>
121_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
122operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id) {
123 // [thread.thread.id]/9
124 // Effects: Inserts the text representation for charT of id into out.
125 //
126 // [thread.thread.id]/2
127 // The text representation for the character type charT of an
128 // object of type thread::id is an unspecified sequence of charT
129 // such that, for two objects of type thread::id x and y, if
130 // x == y is true, the thread::id objects have the same text
131 // representation, and if x != y is true, the thread::id objects
132 // have distinct text representations.
133 //
134 // Since various flags in the output stream can affect how the
135 // thread id is represented (e.g. numpunct or showbase), we
136 // use a temporary stream instead and just output the thread
137 // id representation as a string.
138
139 basic_ostringstream<_CharT, _Traits> __sstr;
140 __sstr.imbue(locale::classic());
141 __sstr << __id.__id_;
142 return __os << __sstr.str();
143}
144#endif // _LIBCPP_HAS_NO_LOCALIZATION
145
146class _LIBCPP_EXPORTED_FROM_ABI thread {
147 __libcpp_thread_t __t_;
148
149 thread(const thread&);
150 thread& operator=(const thread&);
151
152public:
153 typedef __thread_id id;
154 typedef __libcpp_thread_t native_handle_type;
155
156 _LIBCPP_HIDE_FROM_ABI thread() _NOEXCEPT : __t_(_LIBCPP_NULL_THREAD) {}
157 template <class _Fp>
158 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS explicit thread(_Fp __f);
159 ~thread();
160
161 _LIBCPP_HIDE_FROM_ABI thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) { __t.__t_ = _LIBCPP_NULL_THREAD; }
162
163 _LIBCPP_HIDE_FROM_ABI thread& operator=(thread&& __t) _NOEXCEPT {
164 if (!__libcpp_thread_isnull(&__t_))
165 terminate();
166 __t_ = __t.__t_;
167 __t.__t_ = _LIBCPP_NULL_THREAD;
168 return *this;
169 }
170
171 _LIBCPP_HIDE_FROM_ABI void swap(thread& __t) _NOEXCEPT { std::swap(__t_, __t.__t_); }
172
173 _LIBCPP_HIDE_FROM_ABI bool joinable() const _NOEXCEPT { return !__libcpp_thread_isnull(&__t_); }
174 void join();
175 void detach();
176 _LIBCPP_HIDE_FROM_ABI id get_id() const _NOEXCEPT { return __libcpp_thread_get_id(&__t_); }
177 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() _NOEXCEPT { return __t_; }
178
179 static unsigned hardware_concurrency() _NOEXCEPT;
180};
181
182template <class _Fp>
183struct __thread_invoke_pair {
184 // This type is used to pass memory for thread local storage and a functor
185 // to a newly created thread because std::pair doesn't work with
186 // std::unique_ptr in C++03.
187 _LIBCPP_HIDE_FROM_ABI __thread_invoke_pair(_Fp& __f) : __tsp_(new __thread_struct), __fn_(__f) {}
188 unique_ptr<__thread_struct> __tsp_;
189 _Fp __fn_;
190};
191
192template <class _Fp>
193_LIBCPP_HIDE_FROM_ABI void* __thread_proxy_cxx03(void* __vp) {
194 unique_ptr<_Fp> __p(static_cast<_Fp*>(__vp));
195 __thread_local_data().set_pointer(__p->__tsp_.release());
196 (__p->__fn_)();
197 return nullptr;
198}
199
200template <class _Fp>
201thread::thread(_Fp __f) {
202 typedef __thread_invoke_pair<_Fp> _InvokePair;
203 typedef unique_ptr<_InvokePair> _PairPtr;
204 _PairPtr __pp(new _InvokePair(__f));
205 int __ec = std::__libcpp_thread_create(&__t_, &__thread_proxy_cxx03<_InvokePair>, __pp.get());
206 if (__ec == 0)
207 __pp.release();
208 else
209 __throw_system_error(__ec, "thread constructor failed");
210}
211
212inline _LIBCPP_HIDE_FROM_ABI void swap(thread& __x, thread& __y) _NOEXCEPT { __x.swap(__y); }
213
214_LIBCPP_END_NAMESPACE_STD
215
216_LIBCPP_POP_MACROS
217
218#endif // _LIBCPP___CXX03___THREAD_THREAD_H
219

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source code of libcxx/include/__cxx03/__thread/thread.h