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 _LIBCPP_BEGIN_NAMESPACE_STD
25 class _LIBCPP_TYPE_VIS mutex
30 _LIBCPP_INLINE_VISIBILITY
31 #ifndef _LIBCPP_HAS_NO_CONSTEXPR
32 constexpr mutex() _NOEXCEPT : __m_(PTHREAD_MUTEX_INITIALIZER) {}
34 mutex() _NOEXCEPT {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;}
39 mutex(const mutex&);// = delete;
40 mutex& operator=(const mutex&);// = delete;
44 bool try_lock() _NOEXCEPT;
45 void unlock() _NOEXCEPT;
47 typedef pthread_mutex_t* native_handle_type;
48 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;}
51 struct _LIBCPP_TYPE_VIS defer_lock_t {};
52 struct _LIBCPP_TYPE_VIS try_to_lock_t {};
53 struct _LIBCPP_TYPE_VIS adopt_lock_t {};
55 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_MUTEX)
57 extern const defer_lock_t defer_lock;
58 extern const try_to_lock_t try_to_lock;
59 extern const adopt_lock_t adopt_lock;
63 constexpr defer_lock_t defer_lock = defer_lock_t();
64 constexpr try_to_lock_t try_to_lock = try_to_lock_t();
65 constexpr adopt_lock_t adopt_lock = adopt_lock_t();
69 template <class _Mutex>
70 class _LIBCPP_TYPE_VIS_ONLY lock_guard
73 typedef _Mutex mutex_type;
79 _LIBCPP_INLINE_VISIBILITY
80 explicit lock_guard(mutex_type& __m)
81 : __m_(__m) {__m_.lock();}
82 _LIBCPP_INLINE_VISIBILITY
83 lock_guard(mutex_type& __m, adopt_lock_t)
85 _LIBCPP_INLINE_VISIBILITY
86 ~lock_guard() {__m_.unlock();}
89 lock_guard(lock_guard const&);// = delete;
90 lock_guard& operator=(lock_guard const&);// = delete;
93 template <class _Mutex>
94 class _LIBCPP_TYPE_VIS_ONLY unique_lock
97 typedef _Mutex mutex_type;
104 _LIBCPP_INLINE_VISIBILITY
105 unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {}
106 _LIBCPP_INLINE_VISIBILITY
107 explicit unique_lock(mutex_type& __m)
108 : __m_(&__m), __owns_(true) {__m_->lock();}
109 _LIBCPP_INLINE_VISIBILITY
110 unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT
111 : __m_(&__m), __owns_(false) {}
112 _LIBCPP_INLINE_VISIBILITY
113 unique_lock(mutex_type& __m, try_to_lock_t)
114 : __m_(&__m), __owns_(__m.try_lock()) {}
115 _LIBCPP_INLINE_VISIBILITY
116 unique_lock(mutex_type& __m, adopt_lock_t)
117 : __m_(&__m), __owns_(true) {}
118 template <class _Clock, class _Duration>
119 _LIBCPP_INLINE_VISIBILITY
120 unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
121 : __m_(&__m), __owns_(__m.try_lock_until(__t)) {}
122 template <class _Rep, class _Period>
123 _LIBCPP_INLINE_VISIBILITY
124 unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
125 : __m_(&__m), __owns_(__m.try_lock_for(__d)) {}
126 _LIBCPP_INLINE_VISIBILITY
134 unique_lock(unique_lock const&); // = delete;
135 unique_lock& operator=(unique_lock const&); // = delete;
138 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
139 _LIBCPP_INLINE_VISIBILITY
140 unique_lock(unique_lock&& __u) _NOEXCEPT
141 : __m_(__u.__m_), __owns_(__u.__owns_)
142 {__u.__m_ = nullptr; __u.__owns_ = false;}
143 _LIBCPP_INLINE_VISIBILITY
144 unique_lock& operator=(unique_lock&& __u) _NOEXCEPT
149 __owns_ = __u.__owns_;
155 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
160 template <class _Rep, class _Period>
161 bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
162 template <class _Clock, class _Duration>
163 bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
167 _LIBCPP_INLINE_VISIBILITY
168 void swap(unique_lock& __u) _NOEXCEPT
170 _VSTD::swap(__m_, __u.__m_);
171 _VSTD::swap(__owns_, __u.__owns_);
173 _LIBCPP_INLINE_VISIBILITY
174 mutex_type* release() _NOEXCEPT
176 mutex_type* __m = __m_;
182 _LIBCPP_INLINE_VISIBILITY
183 bool owns_lock() const _NOEXCEPT {return __owns_;}
184 _LIBCPP_INLINE_VISIBILITY
186 operator bool () const _NOEXCEPT {return __owns_;}
187 _LIBCPP_INLINE_VISIBILITY
188 mutex_type* mutex() const _NOEXCEPT {return __m_;}
191 template <class _Mutex>
193 unique_lock<_Mutex>::lock()
196 __throw_system_error(EPERM, "unique_lock::lock: references null mutex");
198 __throw_system_error(EDEADLK, "unique_lock::lock: already locked");
203 template <class _Mutex>
205 unique_lock<_Mutex>::try_lock()
208 __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
210 __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
211 __owns_ = __m_->try_lock();
215 template <class _Mutex>
216 template <class _Rep, class _Period>
218 unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
221 __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
223 __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
224 __owns_ = __m_->try_lock_for(__d);
228 template <class _Mutex>
229 template <class _Clock, class _Duration>
231 unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
234 __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
236 __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
237 __owns_ = __m_->try_lock_until(__t);
241 template <class _Mutex>
243 unique_lock<_Mutex>::unlock()
246 __throw_system_error(EPERM, "unique_lock::unlock: not locked");
251 template <class _Mutex>
252 inline _LIBCPP_INLINE_VISIBILITY
254 swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT
257 struct _LIBCPP_TYPE_VIS cv_status
266 _LIBCPP_INLINE_VISIBILITY cv_status(__lx __v) : __v_(__v) {}
267 _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;}
271 class _LIBCPP_TYPE_VIS condition_variable
273 pthread_cond_t __cv_;
275 _LIBCPP_INLINE_VISIBILITY
276 #ifndef _LIBCPP_HAS_NO_CONSTEXPR
277 constexpr condition_variable() : __cv_(PTHREAD_COND_INITIALIZER) {}
279 condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;}
281 ~condition_variable();
284 condition_variable(const condition_variable&); // = delete;
285 condition_variable& operator=(const condition_variable&); // = delete;
288 void notify_one() _NOEXCEPT;
289 void notify_all() _NOEXCEPT;
291 void wait(unique_lock<mutex>& __lk);
292 template <class _Predicate>
293 void wait(unique_lock<mutex>& __lk, _Predicate __pred);
295 template <class _Clock, class _Duration>
297 wait_until(unique_lock<mutex>& __lk,
298 const chrono::time_point<_Clock, _Duration>& __t);
300 template <class _Clock, class _Duration, class _Predicate>
302 wait_until(unique_lock<mutex>& __lk,
303 const chrono::time_point<_Clock, _Duration>& __t,
306 template <class _Rep, class _Period>
308 wait_for(unique_lock<mutex>& __lk,
309 const chrono::duration<_Rep, _Period>& __d);
311 template <class _Rep, class _Period, class _Predicate>
313 wait_for(unique_lock<mutex>& __lk,
314 const chrono::duration<_Rep, _Period>& __d,
317 typedef pthread_cond_t* native_handle_type;
318 _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;}
321 void __do_timed_wait(unique_lock<mutex>& __lk,
322 chrono::time_point<chrono::system_clock, chrono::nanoseconds>);
325 template <class _To, class _Rep, class _Period>
326 inline _LIBCPP_INLINE_VISIBILITY
329 chrono::__is_duration<_To>::value,
332 __ceil(chrono::duration<_Rep, _Period> __d)
334 using namespace chrono;
335 _To __r = duration_cast<_To>(__d);
341 template <class _Predicate>
343 condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred)
349 template <class _Clock, class _Duration>
351 condition_variable::wait_until(unique_lock<mutex>& __lk,
352 const chrono::time_point<_Clock, _Duration>& __t)
354 using namespace chrono;
355 wait_for(__lk, __t - _Clock::now());
356 return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
359 template <class _Clock, class _Duration, class _Predicate>
361 condition_variable::wait_until(unique_lock<mutex>& __lk,
362 const chrono::time_point<_Clock, _Duration>& __t,
367 if (wait_until(__lk, __t) == cv_status::timeout)
373 template <class _Rep, class _Period>
375 condition_variable::wait_for(unique_lock<mutex>& __lk,
376 const chrono::duration<_Rep, _Period>& __d)
378 using namespace chrono;
379 if (__d <= __d.zero())
380 return cv_status::timeout;
381 typedef time_point<system_clock, duration<long double, nano> > __sys_tpf;
382 typedef time_point<system_clock, nanoseconds> __sys_tpi;
383 __sys_tpf _Max = __sys_tpi::max();
384 system_clock::time_point __s_now = system_clock::now();
385 steady_clock::time_point __c_now = steady_clock::now();
386 if (_Max - __d > __s_now)
387 __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d));
389 __do_timed_wait(__lk, __sys_tpi::max());
390 return steady_clock::now() - __c_now < __d ? cv_status::no_timeout :
394 template <class _Rep, class _Period, class _Predicate>
395 inline _LIBCPP_INLINE_VISIBILITY
397 condition_variable::wait_for(unique_lock<mutex>& __lk,
398 const chrono::duration<_Rep, _Period>& __d,
401 return wait_until(__lk, chrono::steady_clock::now() + __d,
402 _VSTD::move(__pred));
405 _LIBCPP_END_NAMESPACE_STD
407 #endif // _LIBCPP___MUTEX_BASE