2 //===----------------------------------------------------------------------===//
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 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP___MUTEX_BASE
12 #define _LIBCPP___MUTEX_BASE
16 #include <system_error>
19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20 #pragma GCC system_header
23 #ifdef _LIBCPP_SHARED_LOCK
26 template <class _Mutex> class shared_lock;
27 template <class _Mutex> class upgrade_lock;
30 #endif // _LIBCPP_SHARED_LOCK
33 _LIBCPP_BEGIN_NAMESPACE_STD
35 class _LIBCPP_VISIBLE mutex
40 _LIBCPP_INLINE_VISIBILITY
41 mutex() {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;}
45 mutex(const mutex&);// = delete;
46 mutex& operator=(const mutex&);// = delete;
53 typedef pthread_mutex_t* native_handle_type;
54 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;}
57 struct _LIBCPP_VISIBLE defer_lock_t {};
58 struct _LIBCPP_VISIBLE try_to_lock_t {};
59 struct _LIBCPP_VISIBLE adopt_lock_t {};
63 defer_lock_t defer_lock;
67 try_to_lock_t try_to_lock;
71 adopt_lock_t adopt_lock;
73 template <class _Mutex>
74 class _LIBCPP_VISIBLE lock_guard
77 typedef _Mutex mutex_type;
83 _LIBCPP_INLINE_VISIBILITY
84 explicit lock_guard(mutex_type& __m)
85 : __m_(__m) {__m_.lock();}
86 _LIBCPP_INLINE_VISIBILITY
87 lock_guard(mutex_type& __m, adopt_lock_t)
89 _LIBCPP_INLINE_VISIBILITY
90 ~lock_guard() {__m_.unlock();}
93 lock_guard(lock_guard const&);// = delete;
94 lock_guard& operator=(lock_guard const&);// = delete;
97 template <class _Mutex>
98 class _LIBCPP_VISIBLE unique_lock
101 typedef _Mutex mutex_type;
108 _LIBCPP_INLINE_VISIBILITY
109 unique_lock() : __m_(nullptr), __owns_(false) {}
110 _LIBCPP_INLINE_VISIBILITY
111 explicit unique_lock(mutex_type& __m)
112 : __m_(&__m), __owns_(true) {__m_->lock();}
113 _LIBCPP_INLINE_VISIBILITY
114 unique_lock(mutex_type& __m, defer_lock_t)
115 : __m_(&__m), __owns_(false) {}
116 _LIBCPP_INLINE_VISIBILITY
117 unique_lock(mutex_type& __m, try_to_lock_t)
118 : __m_(&__m), __owns_(__m.try_lock()) {}
119 _LIBCPP_INLINE_VISIBILITY
120 unique_lock(mutex_type& __m, adopt_lock_t)
121 : __m_(&__m), __owns_(true) {}
122 template <class _Clock, class _Duration>
123 _LIBCPP_INLINE_VISIBILITY
124 unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
125 : __m_(&__m), __owns_(__m.try_lock_until(__t)) {}
126 template <class _Rep, class _Period>
127 _LIBCPP_INLINE_VISIBILITY
128 unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
129 : __m_(&__m), __owns_(__m.try_lock_for(__d)) {}
130 _LIBCPP_INLINE_VISIBILITY
138 unique_lock(unique_lock const&); // = delete;
139 unique_lock& operator=(unique_lock const&); // = delete;
142 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
143 _LIBCPP_INLINE_VISIBILITY
144 unique_lock(unique_lock&& __u)
145 : __m_(__u.__m_), __owns_(__u.__owns_)
146 {__u.__m_ = nullptr; __u.__owns_ = false;}
147 _LIBCPP_INLINE_VISIBILITY
148 unique_lock& operator=(unique_lock&& __u)
153 __owns_ = __u.__owns_;
159 #ifdef _LIBCPP_SHARED_LOCK
161 unique_lock(ting::shared_lock<mutex_type>&&, try_to_lock_t);
162 template <class _Clock, class _Duration>
163 unique_lock(ting::shared_lock<mutex_type>&&,
164 const chrono::time_point<_Clock, _Duration>&);
165 template <class _Rep, class _Period>
166 unique_lock(ting::shared_lock<mutex_type>&&,
167 const chrono::duration<_Rep, _Period>&);
169 explicit unique_lock(ting::upgrade_lock<mutex_type>&&);
170 unique_lock(ting::upgrade_lock<mutex_type>&&, try_to_lock_t);
171 template <class _Clock, class _Duration>
172 unique_lock(ting::upgrade_lock<mutex_type>&&,
173 const chrono::time_point<_Clock, _Duration>&);
174 template <class _Rep, class _Period>
175 unique_lock(ting::upgrade_lock<mutex_type>&&,
176 const chrono::duration<_Rep, _Period>&);
178 #endif // _LIBCPP_SHARED_LOCK
180 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
185 template <class _Rep, class _Period>
186 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
187 template <class _Clock, class _Duration>
188 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
192 _LIBCPP_INLINE_VISIBILITY
193 void swap(unique_lock& __u)
195 _VSTD::swap(__m_, __u.__m_);
196 _VSTD::swap(__owns_, __u.__owns_);
198 _LIBCPP_INLINE_VISIBILITY
199 mutex_type* release()
201 mutex_type* __m = __m_;
207 _LIBCPP_INLINE_VISIBILITY
208 bool owns_lock() const {return __owns_;}
209 _LIBCPP_INLINE_VISIBILITY
211 operator bool () const {return __owns_;}
212 _LIBCPP_INLINE_VISIBILITY
213 mutex_type* mutex() const {return __m_;}
216 template <class _Mutex>
218 unique_lock<_Mutex>::lock()
221 __throw_system_error(EPERM, "unique_lock::lock: references null mutex");
223 __throw_system_error(EDEADLK, "unique_lock::lock: already locked");
228 template <class _Mutex>
230 unique_lock<_Mutex>::try_lock()
233 __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
235 __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
236 __owns_ = __m_->try_lock();
240 template <class _Mutex>
241 template <class _Rep, class _Period>
243 unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
246 __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
248 __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
249 __owns_ = __m_->try_lock_for(__d);
253 template <class _Mutex>
254 template <class _Clock, class _Duration>
256 unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
259 __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
261 __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
262 __owns_ = __m_->try_lock_until(__t);
266 template <class _Mutex>
268 unique_lock<_Mutex>::unlock()
271 __throw_system_error(EPERM, "unique_lock::unlock: not locked");
276 template <class _Mutex>
277 inline _LIBCPP_INLINE_VISIBILITY
279 swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) {__x.swap(__y);}
281 struct _LIBCPP_VISIBLE cv_status
290 _LIBCPP_INLINE_VISIBILITY cv_status(_ __v) : __v_(__v) {}
291 _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;}
295 class _LIBCPP_VISIBLE condition_variable
297 pthread_cond_t __cv_;
299 _LIBCPP_INLINE_VISIBILITY
300 condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;}
301 ~condition_variable();
304 condition_variable(const condition_variable&); // = delete;
305 condition_variable& operator=(const condition_variable&); // = delete;
311 void wait(unique_lock<mutex>& __lk);
312 template <class _Predicate>
313 void wait(unique_lock<mutex>& __lk, _Predicate __pred);
315 template <class _Duration>
317 wait_until(unique_lock<mutex>& __lk,
318 const chrono::time_point<chrono::system_clock, _Duration>& __t);
320 template <class _Clock, class _Duration>
322 wait_until(unique_lock<mutex>& __lk,
323 const chrono::time_point<_Clock, _Duration>& __t);
325 template <class _Clock, class _Duration, class _Predicate>
327 wait_until(unique_lock<mutex>& __lk,
328 const chrono::time_point<_Clock, _Duration>& __t,
331 template <class _Rep, class _Period>
333 wait_for(unique_lock<mutex>& __lk,
334 const chrono::duration<_Rep, _Period>& __d);
336 template <class _Rep, class _Period, class _Predicate>
338 wait_for(unique_lock<mutex>& __lk,
339 const chrono::duration<_Rep, _Period>& __d,
342 typedef pthread_cond_t* native_handle_type;
343 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;}
346 void __do_timed_wait(unique_lock<mutex>& __lk,
347 chrono::time_point<chrono::system_clock, chrono::nanoseconds>);
350 template <class _To, class _Rep, class _Period>
351 inline _LIBCPP_INLINE_VISIBILITY
354 chrono::__is_duration<_To>::value,
357 __ceil(chrono::duration<_Rep, _Period> __d)
359 using namespace chrono;
360 _To __r = duration_cast<_To>(__d);
366 template <class _Predicate>
368 condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred)
374 template <class _Duration>
376 condition_variable::wait_until(unique_lock<mutex>& __lk,
377 const chrono::time_point<chrono::system_clock, _Duration>& __t)
379 using namespace chrono;
380 typedef time_point<system_clock, nanoseconds> __nano_sys_tmpt;
381 __do_timed_wait(__lk,
382 __nano_sys_tmpt(__ceil<nanoseconds>(__t.time_since_epoch())));
383 return system_clock::now() < __t ? cv_status::no_timeout :
387 template <class _Clock, class _Duration>
389 condition_variable::wait_until(unique_lock<mutex>& __lk,
390 const chrono::time_point<_Clock, _Duration>& __t)
392 using namespace chrono;
393 system_clock::time_point __s_now = system_clock::now();
394 typename _Clock::time_point __c_now = _Clock::now();
395 __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__t - __c_now));
396 return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
399 template <class _Clock, class _Duration, class _Predicate>
401 condition_variable::wait_until(unique_lock<mutex>& __lk,
402 const chrono::time_point<_Clock, _Duration>& __t,
407 if (wait_until(__lk, __t) == cv_status::timeout)
413 template <class _Rep, class _Period>
415 condition_variable::wait_for(unique_lock<mutex>& __lk,
416 const chrono::duration<_Rep, _Period>& __d)
418 using namespace chrono;
419 system_clock::time_point __s_now = system_clock::now();
420 steady_clock::time_point __c_now = steady_clock::now();
421 __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d));
422 return steady_clock::now() - __c_now < __d ? cv_status::no_timeout :
426 template <class _Rep, class _Period, class _Predicate>
427 inline _LIBCPP_INLINE_VISIBILITY
429 condition_variable::wait_for(unique_lock<mutex>& __lk,
430 const chrono::duration<_Rep, _Period>& __d,
433 return wait_until(__lk, chrono::steady_clock::now() + __d,
434 _VSTD::move(__pred));
437 _LIBCPP_END_NAMESPACE_STD
439 #endif // _LIBCPP___MUTEX_BASE