2 //===--------------------------- mutex ------------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
23 constexpr mutex() noexcept;
26 mutex(const mutex&) = delete;
27 mutex& operator=(const mutex&) = delete;
33 typedef pthread_mutex_t* native_handle_type;
34 native_handle_type native_handle();
43 recursive_mutex(const recursive_mutex&) = delete;
44 recursive_mutex& operator=(const recursive_mutex&) = delete;
47 bool try_lock() noexcept;
50 typedef pthread_mutex_t* native_handle_type;
51 native_handle_type native_handle();
60 timed_mutex(const timed_mutex&) = delete;
61 timed_mutex& operator=(const timed_mutex&) = delete;
65 template <class Rep, class Period>
66 bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
67 template <class Clock, class Duration>
68 bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
72 class recursive_timed_mutex
75 recursive_timed_mutex();
76 ~recursive_timed_mutex();
78 recursive_timed_mutex(const recursive_timed_mutex&) = delete;
79 recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;
82 bool try_lock() noexcept;
83 template <class Rep, class Period>
84 bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
85 template <class Clock, class Duration>
86 bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
90 struct defer_lock_t {};
91 struct try_to_lock_t {};
92 struct adopt_lock_t {};
94 constexpr defer_lock_t defer_lock{};
95 constexpr try_to_lock_t try_to_lock{};
96 constexpr adopt_lock_t adopt_lock{};
98 template <class Mutex>
102 typedef Mutex mutex_type;
104 explicit lock_guard(mutex_type& m);
105 lock_guard(mutex_type& m, adopt_lock_t);
108 lock_guard(lock_guard const&) = delete;
109 lock_guard& operator=(lock_guard const&) = delete;
112 template <class Mutex>
116 typedef Mutex mutex_type;
117 unique_lock() noexcept;
118 explicit unique_lock(mutex_type& m);
119 unique_lock(mutex_type& m, defer_lock_t) noexcept;
120 unique_lock(mutex_type& m, try_to_lock_t);
121 unique_lock(mutex_type& m, adopt_lock_t);
122 template <class Clock, class Duration>
123 unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
124 template <class Rep, class Period>
125 unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
128 unique_lock(unique_lock const&) = delete;
129 unique_lock& operator=(unique_lock const&) = delete;
131 unique_lock(unique_lock&& u) noexcept;
132 unique_lock& operator=(unique_lock&& u) noexcept;
137 template <class Rep, class Period>
138 bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
139 template <class Clock, class Duration>
140 bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
144 void swap(unique_lock& u) noexcept;
145 mutex_type* release() noexcept;
147 bool owns_lock() const noexcept;
148 explicit operator bool () const noexcept;
149 mutex_type* mutex() const noexcept;
152 template <class Mutex>
153 void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y) noexcept;
155 template <class L1, class L2, class... L3>
156 int try_lock(L1&, L2&, L3&...);
157 template <class L1, class L2, class... L3>
158 void lock(L1&, L2&, L3&...);
162 constexpr once_flag() noexcept;
164 once_flag(const once_flag&) = delete;
165 once_flag& operator=(const once_flag&) = delete;
168 template<class Callable, class ...Args>
169 void call_once(once_flag& flag, Callable&& func, Args&&... args);
176 #include <__mutex_base>
177 #include <functional>
178 #ifndef _LIBCPP_HAS_NO_VARIADICS
183 #include <__undef_min_max>
185 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
186 #pragma GCC system_header
189 _LIBCPP_BEGIN_NAMESPACE_STD
191 #ifndef _LIBCPP_HAS_NO_THREADS
193 class _LIBCPP_TYPE_VIS recursive_mutex
195 pthread_mutex_t __m_;
202 recursive_mutex(const recursive_mutex&); // = delete;
203 recursive_mutex& operator=(const recursive_mutex&); // = delete;
207 bool try_lock() _NOEXCEPT;
208 void unlock() _NOEXCEPT;
210 typedef pthread_mutex_t* native_handle_type;
211 _LIBCPP_INLINE_VISIBILITY
212 native_handle_type native_handle() {return &__m_;}
215 class _LIBCPP_TYPE_VIS timed_mutex
218 condition_variable __cv_;
225 timed_mutex(const timed_mutex&); // = delete;
226 timed_mutex& operator=(const timed_mutex&); // = delete;
230 bool try_lock() _NOEXCEPT;
231 template <class _Rep, class _Period>
232 _LIBCPP_INLINE_VISIBILITY
233 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d)
234 {return try_lock_until(chrono::steady_clock::now() + __d);}
235 template <class _Clock, class _Duration>
236 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
237 void unlock() _NOEXCEPT;
240 template <class _Clock, class _Duration>
242 timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
244 using namespace chrono;
245 unique_lock<mutex> __lk(__m_);
246 bool no_timeout = _Clock::now() < __t;
247 while (no_timeout && __locked_)
248 no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout;
257 class _LIBCPP_TYPE_VIS recursive_timed_mutex
260 condition_variable __cv_;
264 recursive_timed_mutex();
265 ~recursive_timed_mutex();
268 recursive_timed_mutex(const recursive_timed_mutex&); // = delete;
269 recursive_timed_mutex& operator=(const recursive_timed_mutex&); // = delete;
273 bool try_lock() _NOEXCEPT;
274 template <class _Rep, class _Period>
275 _LIBCPP_INLINE_VISIBILITY
276 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d)
277 {return try_lock_until(chrono::steady_clock::now() + __d);}
278 template <class _Clock, class _Duration>
279 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
280 void unlock() _NOEXCEPT;
283 template <class _Clock, class _Duration>
285 recursive_timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
287 using namespace chrono;
288 pthread_t __id = pthread_self();
289 unique_lock<mutex> lk(__m_);
290 if (pthread_equal(__id, __id_))
292 if (__count_ == numeric_limits<size_t>::max())
297 bool no_timeout = _Clock::now() < __t;
298 while (no_timeout && __count_ != 0)
299 no_timeout = __cv_.wait_until(lk, __t) == cv_status::no_timeout;
309 template <class _L0, class _L1>
311 try_lock(_L0& __l0, _L1& __l1)
313 unique_lock<_L0> __u0(__l0, try_to_lock);
314 if (__u0.owns_lock())
327 #ifndef _LIBCPP_HAS_NO_VARIADICS
329 template <class _L0, class _L1, class _L2, class... _L3>
331 try_lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3&... __l3)
334 unique_lock<_L0> __u0(__l0, try_to_lock);
335 if (__u0.owns_lock())
337 __r = try_lock(__l1, __l2, __l3...);
346 #endif // _LIBCPP_HAS_NO_VARIADICS
348 template <class _L0, class _L1>
350 lock(_L0& __l0, _L1& __l1)
355 unique_lock<_L0> __u0(__l0);
364 unique_lock<_L1> __u1(__l1);
375 #ifndef _LIBCPP_HAS_NO_VARIADICS
377 template <class _L0, class _L1, class _L2, class ..._L3>
379 __lock_first(int __i, _L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3)
387 unique_lock<_L0> __u0(__l0);
388 __i = try_lock(__l1, __l2, __l3...);
400 unique_lock<_L1> __u1(__l1);
401 __i = try_lock(__l2, __l3..., __l0);
408 if (__i == sizeof...(_L3) + 1)
415 __lock_first(__i - 2, __l2, __l3..., __l0, __l1);
421 template <class _L0, class _L1, class _L2, class ..._L3>
422 inline _LIBCPP_INLINE_VISIBILITY
424 lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3)
426 __lock_first(0, __l0, __l1, __l2, __l3...);
429 #endif // _LIBCPP_HAS_NO_VARIADICS
431 #endif // !_LIBCPP_HAS_NO_THREADS
433 struct _LIBCPP_TYPE_VIS_ONLY once_flag;
435 #ifndef _LIBCPP_HAS_NO_VARIADICS
437 template<class _Callable, class... _Args>
438 _LIBCPP_INLINE_VISIBILITY
439 void call_once(once_flag&, _Callable&&, _Args&&...);
441 #else // _LIBCPP_HAS_NO_VARIADICS
443 template<class _Callable>
444 _LIBCPP_INLINE_VISIBILITY
445 void call_once(once_flag&, _Callable);
447 #endif // _LIBCPP_HAS_NO_VARIADICS
449 struct _LIBCPP_TYPE_VIS_ONLY once_flag
451 _LIBCPP_INLINE_VISIBILITY
453 once_flag() _NOEXCEPT : __state_(0) {}
456 once_flag(const once_flag&); // = delete;
457 once_flag& operator=(const once_flag&); // = delete;
459 unsigned long __state_;
461 #ifndef _LIBCPP_HAS_NO_VARIADICS
462 template<class _Callable, class... _Args>
464 void call_once(once_flag&, _Callable&&, _Args&&...);
465 #else // _LIBCPP_HAS_NO_VARIADICS
466 template<class _Callable>
468 void call_once(once_flag&, _Callable);
469 #endif // _LIBCPP_HAS_NO_VARIADICS
472 #ifndef _LIBCPP_HAS_NO_VARIADICS
475 class __call_once_param
479 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
480 _LIBCPP_INLINE_VISIBILITY
481 explicit __call_once_param(_Fp&& __f) : __f_(_VSTD::move(__f)) {}
483 _LIBCPP_INLINE_VISIBILITY
484 explicit __call_once_param(const _Fp& __f) : __f_(__f) {}
487 _LIBCPP_INLINE_VISIBILITY
490 typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 1>::type _Index;
495 template <size_t ..._Indices>
496 _LIBCPP_INLINE_VISIBILITY
497 void __execute(__tuple_indices<_Indices...>)
499 __invoke(_VSTD::move(_VSTD::get<0>(__f_)), _VSTD::move(_VSTD::get<_Indices>(__f_))...);
506 class __call_once_param
510 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
511 _LIBCPP_INLINE_VISIBILITY
512 explicit __call_once_param(_Fp&& __f) : __f_(_VSTD::move(__f)) {}
514 _LIBCPP_INLINE_VISIBILITY
515 explicit __call_once_param(const _Fp& __f) : __f_(__f) {}
518 _LIBCPP_INLINE_VISIBILITY
529 __call_once_proxy(void* __vp)
531 __call_once_param<_Fp>* __p = static_cast<__call_once_param<_Fp>*>(__vp);
535 _LIBCPP_FUNC_VIS void __call_once(volatile unsigned long&, void*, void(*)(void*));
537 #ifndef _LIBCPP_HAS_NO_VARIADICS
539 template<class _Callable, class... _Args>
540 inline _LIBCPP_INLINE_VISIBILITY
542 call_once(once_flag& __flag, _Callable&& __func, _Args&&... __args)
544 if (__flag.__state_ != ~0ul)
546 typedef tuple<typename decay<_Callable>::type, typename decay<_Args>::type...> _Gp;
547 __call_once_param<_Gp> __p(_Gp(__decay_copy(_VSTD::forward<_Callable>(__func)),
548 __decay_copy(_VSTD::forward<_Args>(__args))...));
549 __call_once(__flag.__state_, &__p, &__call_once_proxy<_Gp>);
553 #else // _LIBCPP_HAS_NO_VARIADICS
555 template<class _Callable>
556 inline _LIBCPP_INLINE_VISIBILITY
558 call_once(once_flag& __flag, _Callable __func)
560 if (__flag.__state_ != ~0ul)
562 __call_once_param<_Callable> __p(__func);
563 __call_once(__flag.__state_, &__p, &__call_once_proxy<_Callable>);
567 #endif // _LIBCPP_HAS_NO_VARIADICS
569 _LIBCPP_END_NAMESPACE_STD
571 #endif // _LIBCPP_MUTEX