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comparison libcxx/include/thread @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 2e18cbf3894f
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147:c2174574ed3a 150:1d019706d866
1 // -*- C++ -*-
2 //===--------------------------- thread -----------------------------------===//
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_THREAD
11 #define _LIBCPP_THREAD
12
13 /*
14
15 thread synopsis
16
17 namespace std
18 {
19
20 class thread
21 {
22 public:
23 class id;
24 typedef pthread_t native_handle_type;
25
26 thread() noexcept;
27 template <class F, class ...Args> explicit thread(F&& f, Args&&... args);
28 ~thread();
29
30 thread(const thread&) = delete;
31 thread(thread&& t) noexcept;
32
33 thread& operator=(const thread&) = delete;
34 thread& operator=(thread&& t) noexcept;
35
36 void swap(thread& t) noexcept;
37
38 bool joinable() const noexcept;
39 void join();
40 void detach();
41 id get_id() const noexcept;
42 native_handle_type native_handle();
43
44 static unsigned hardware_concurrency() noexcept;
45 };
46
47 void swap(thread& x, thread& y) noexcept;
48
49 class thread::id
50 {
51 public:
52 id() noexcept;
53 };
54
55 bool operator==(thread::id x, thread::id y) noexcept;
56 bool operator!=(thread::id x, thread::id y) noexcept;
57 bool operator< (thread::id x, thread::id y) noexcept;
58 bool operator<=(thread::id x, thread::id y) noexcept;
59 bool operator> (thread::id x, thread::id y) noexcept;
60 bool operator>=(thread::id x, thread::id y) noexcept;
61
62 template<class charT, class traits>
63 basic_ostream<charT, traits>&
64 operator<<(basic_ostream<charT, traits>& out, thread::id id);
65
66 namespace this_thread
67 {
68
69 thread::id get_id() noexcept;
70
71 void yield() noexcept;
72
73 template <class Clock, class Duration>
74 void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
75
76 template <class Rep, class Period>
77 void sleep_for(const chrono::duration<Rep, Period>& rel_time);
78
79 } // this_thread
80
81 } // std
82
83 */
84
85 #include <__config>
86 #include <iosfwd>
87 #include <__functional_base>
88 #include <type_traits>
89 #include <cstddef>
90 #include <functional>
91 #include <memory>
92 #include <system_error>
93 #include <chrono>
94 #include <__mutex_base>
95 #ifndef _LIBCPP_CXX03_LANG
96 #include <tuple>
97 #endif
98 #include <__threading_support>
99 #include <__debug>
100
101 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
102 #pragma GCC system_header
103 #endif
104
105 _LIBCPP_PUSH_MACROS
106 #include <__undef_macros>
107
108 #ifdef _LIBCPP_HAS_NO_THREADS
109 #error <thread> is not supported on this single threaded system
110 #else // !_LIBCPP_HAS_NO_THREADS
111
112 _LIBCPP_BEGIN_NAMESPACE_STD
113
114 template <class _Tp> class __thread_specific_ptr;
115 class _LIBCPP_TYPE_VIS __thread_struct;
116 class _LIBCPP_HIDDEN __thread_struct_imp;
117 class __assoc_sub_state;
118
119 _LIBCPP_FUNC_VIS __thread_specific_ptr<__thread_struct>& __thread_local_data();
120
121 class _LIBCPP_TYPE_VIS __thread_struct
122 {
123 __thread_struct_imp* __p_;
124
125 __thread_struct(const __thread_struct&);
126 __thread_struct& operator=(const __thread_struct&);
127 public:
128 __thread_struct();
129 ~__thread_struct();
130
131 void notify_all_at_thread_exit(condition_variable*, mutex*);
132 void __make_ready_at_thread_exit(__assoc_sub_state*);
133 };
134
135 template <class _Tp>
136 class __thread_specific_ptr
137 {
138 __libcpp_tls_key __key_;
139
140 // Only __thread_local_data() may construct a __thread_specific_ptr
141 // and only with _Tp == __thread_struct.
142 static_assert((is_same<_Tp, __thread_struct>::value), "");
143 __thread_specific_ptr();
144 friend _LIBCPP_FUNC_VIS __thread_specific_ptr<__thread_struct>& __thread_local_data();
145
146 __thread_specific_ptr(const __thread_specific_ptr&);
147 __thread_specific_ptr& operator=(const __thread_specific_ptr&);
148
149 _LIBCPP_HIDDEN static void _LIBCPP_TLS_DESTRUCTOR_CC __at_thread_exit(void*);
150
151 public:
152 typedef _Tp* pointer;
153
154 ~__thread_specific_ptr();
155
156 _LIBCPP_INLINE_VISIBILITY
157 pointer get() const {return static_cast<_Tp*>(__libcpp_tls_get(__key_));}
158 _LIBCPP_INLINE_VISIBILITY
159 pointer operator*() const {return *get();}
160 _LIBCPP_INLINE_VISIBILITY
161 pointer operator->() const {return get();}
162 void set_pointer(pointer __p);
163 };
164
165 template <class _Tp>
166 void _LIBCPP_TLS_DESTRUCTOR_CC
167 __thread_specific_ptr<_Tp>::__at_thread_exit(void* __p)
168 {
169 delete static_cast<pointer>(__p);
170 }
171
172 template <class _Tp>
173 __thread_specific_ptr<_Tp>::__thread_specific_ptr()
174 {
175 int __ec =
176 __libcpp_tls_create(&__key_, &__thread_specific_ptr::__at_thread_exit);
177 if (__ec)
178 __throw_system_error(__ec, "__thread_specific_ptr construction failed");
179 }
180
181 template <class _Tp>
182 __thread_specific_ptr<_Tp>::~__thread_specific_ptr()
183 {
184 // __thread_specific_ptr is only created with a static storage duration
185 // so this destructor is only invoked during program termination. Invoking
186 // pthread_key_delete(__key_) may prevent other threads from deleting their
187 // thread local data. For this reason we leak the key.
188 }
189
190 template <class _Tp>
191 void
192 __thread_specific_ptr<_Tp>::set_pointer(pointer __p)
193 {
194 _LIBCPP_ASSERT(get() == nullptr,
195 "Attempting to overwrite thread local data");
196 __libcpp_tls_set(__key_, __p);
197 }
198
199 template<>
200 struct _LIBCPP_TEMPLATE_VIS hash<__thread_id>
201 : public unary_function<__thread_id, size_t>
202 {
203 _LIBCPP_INLINE_VISIBILITY
204 size_t operator()(__thread_id __v) const _NOEXCEPT
205 {
206 return hash<__libcpp_thread_id>()(__v.__id_);
207 }
208 };
209
210 template<class _CharT, class _Traits>
211 _LIBCPP_INLINE_VISIBILITY
212 basic_ostream<_CharT, _Traits>&
213 operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id)
214 {return __os << __id.__id_;}
215
216 class _LIBCPP_TYPE_VIS thread
217 {
218 __libcpp_thread_t __t_;
219
220 thread(const thread&);
221 thread& operator=(const thread&);
222 public:
223 typedef __thread_id id;
224 typedef __libcpp_thread_t native_handle_type;
225
226 _LIBCPP_INLINE_VISIBILITY
227 thread() _NOEXCEPT : __t_(_LIBCPP_NULL_THREAD) {}
228 #ifndef _LIBCPP_CXX03_LANG
229 template <class _Fp, class ..._Args,
230 class = typename enable_if
231 <
232 !is_same<typename __uncvref<_Fp>::type, thread>::value
233 >::type
234 >
235 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
236 explicit thread(_Fp&& __f, _Args&&... __args);
237 #else // _LIBCPP_CXX03_LANG
238 template <class _Fp>
239 _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
240 explicit thread(_Fp __f);
241 #endif
242 ~thread();
243
244 #ifndef _LIBCPP_CXX03_LANG
245 _LIBCPP_INLINE_VISIBILITY
246 thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) {__t.__t_ = _LIBCPP_NULL_THREAD;}
247 _LIBCPP_INLINE_VISIBILITY
248 thread& operator=(thread&& __t) _NOEXCEPT;
249 #endif // _LIBCPP_CXX03_LANG
250
251 _LIBCPP_INLINE_VISIBILITY
252 void swap(thread& __t) _NOEXCEPT {_VSTD::swap(__t_, __t.__t_);}
253
254 _LIBCPP_INLINE_VISIBILITY
255 bool joinable() const _NOEXCEPT {return !__libcpp_thread_isnull(&__t_);}
256 void join();
257 void detach();
258 _LIBCPP_INLINE_VISIBILITY
259 id get_id() const _NOEXCEPT {return __libcpp_thread_get_id(&__t_);}
260 _LIBCPP_INLINE_VISIBILITY
261 native_handle_type native_handle() _NOEXCEPT {return __t_;}
262
263 static unsigned hardware_concurrency() _NOEXCEPT;
264 };
265
266 #ifndef _LIBCPP_CXX03_LANG
267
268 template <class _TSp, class _Fp, class ..._Args, size_t ..._Indices>
269 inline _LIBCPP_INLINE_VISIBILITY
270 void
271 __thread_execute(tuple<_TSp, _Fp, _Args...>& __t, __tuple_indices<_Indices...>)
272 {
273 __invoke(_VSTD::move(_VSTD::get<1>(__t)), _VSTD::move(_VSTD::get<_Indices>(__t))...);
274 }
275
276 template <class _Fp>
277 _LIBCPP_INLINE_VISIBILITY
278 void* __thread_proxy(void* __vp)
279 {
280 // _Fp = std::tuple< unique_ptr<__thread_struct>, Functor, Args...>
281 std::unique_ptr<_Fp> __p(static_cast<_Fp*>(__vp));
282 __thread_local_data().set_pointer(_VSTD::get<0>(*__p).release());
283 typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 2>::type _Index;
284 __thread_execute(*__p, _Index());
285 return nullptr;
286 }
287
288 template <class _Fp, class ..._Args,
289 class
290 >
291 thread::thread(_Fp&& __f, _Args&&... __args)
292 {
293 typedef unique_ptr<__thread_struct> _TSPtr;
294 _TSPtr __tsp(new __thread_struct);
295 typedef tuple<_TSPtr, typename decay<_Fp>::type, typename decay<_Args>::type...> _Gp;
296 _VSTD::unique_ptr<_Gp> __p(
297 new _Gp(std::move(__tsp),
298 __decay_copy(_VSTD::forward<_Fp>(__f)),
299 __decay_copy(_VSTD::forward<_Args>(__args))...));
300 int __ec = __libcpp_thread_create(&__t_, &__thread_proxy<_Gp>, __p.get());
301 if (__ec == 0)
302 __p.release();
303 else
304 __throw_system_error(__ec, "thread constructor failed");
305 }
306
307 inline
308 thread&
309 thread::operator=(thread&& __t) _NOEXCEPT
310 {
311 if (!__libcpp_thread_isnull(&__t_))
312 terminate();
313 __t_ = __t.__t_;
314 __t.__t_ = _LIBCPP_NULL_THREAD;
315 return *this;
316 }
317
318 #else // _LIBCPP_CXX03_LANG
319
320 template <class _Fp>
321 struct __thread_invoke_pair {
322 // This type is used to pass memory for thread local storage and a functor
323 // to a newly created thread because std::pair doesn't work with
324 // std::unique_ptr in C++03.
325 __thread_invoke_pair(_Fp& __f) : __tsp_(new __thread_struct), __fn_(__f) {}
326 unique_ptr<__thread_struct> __tsp_;
327 _Fp __fn_;
328 };
329
330 template <class _Fp>
331 void* __thread_proxy_cxx03(void* __vp)
332 {
333 std::unique_ptr<_Fp> __p(static_cast<_Fp*>(__vp));
334 __thread_local_data().set_pointer(__p->__tsp_.release());
335 (__p->__fn_)();
336 return nullptr;
337 }
338
339 template <class _Fp>
340 thread::thread(_Fp __f)
341 {
342
343 typedef __thread_invoke_pair<_Fp> _InvokePair;
344 typedef std::unique_ptr<_InvokePair> _PairPtr;
345 _PairPtr __pp(new _InvokePair(__f));
346 int __ec = __libcpp_thread_create(&__t_, &__thread_proxy_cxx03<_InvokePair>, __pp.get());
347 if (__ec == 0)
348 __pp.release();
349 else
350 __throw_system_error(__ec, "thread constructor failed");
351 }
352
353 #endif // _LIBCPP_CXX03_LANG
354
355 inline _LIBCPP_INLINE_VISIBILITY
356 void swap(thread& __x, thread& __y) _NOEXCEPT {__x.swap(__y);}
357
358 namespace this_thread
359 {
360
361 _LIBCPP_FUNC_VIS void sleep_for(const chrono::nanoseconds& __ns);
362
363 template <class _Rep, class _Period>
364 void
365 sleep_for(const chrono::duration<_Rep, _Period>& __d)
366 {
367 using namespace chrono;
368 if (__d > duration<_Rep, _Period>::zero())
369 {
370 #if defined(_LIBCPP_COMPILER_GCC) && (__powerpc__ || __POWERPC__)
371 // GCC's long double const folding is incomplete for IBM128 long doubles.
372 _LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
373 #else
374 _LIBCPP_CONSTEXPR duration<long double> _Max = duration<long double>(ULLONG_MAX/1000000000ULL) ;
375 #endif
376 nanoseconds __ns;
377 if (__d < _Max)
378 {
379 __ns = duration_cast<nanoseconds>(__d);
380 if (__ns < __d)
381 ++__ns;
382 }
383 else
384 __ns = nanoseconds::max();
385 sleep_for(__ns);
386 }
387 }
388
389 template <class _Clock, class _Duration>
390 void
391 sleep_until(const chrono::time_point<_Clock, _Duration>& __t)
392 {
393 using namespace chrono;
394 mutex __mut;
395 condition_variable __cv;
396 unique_lock<mutex> __lk(__mut);
397 while (_Clock::now() < __t)
398 __cv.wait_until(__lk, __t);
399 }
400
401 template <class _Duration>
402 inline _LIBCPP_INLINE_VISIBILITY
403 void
404 sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t)
405 {
406 using namespace chrono;
407 sleep_for(__t - steady_clock::now());
408 }
409
410 inline _LIBCPP_INLINE_VISIBILITY
411 void yield() _NOEXCEPT {__libcpp_thread_yield();}
412
413 } // this_thread
414
415 _LIBCPP_END_NAMESPACE_STD
416
417 #endif // !_LIBCPP_HAS_NO_THREADS
418
419 _LIBCPP_POP_MACROS
420
421 #endif // _LIBCPP_THREAD