| // -*- C++ -*- |
| //===--------------------------- mutex ------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP_MUTEX |
| #define _LIBCPP_MUTEX |
| |
| /* |
| mutex synopsis |
| |
| namespace std |
| { |
| |
| class mutex |
| { |
| public: |
| mutex(); |
| ~mutex(); |
| |
| mutex(const mutex&) = delete; |
| mutex& operator=(const mutex&) = delete; |
| |
| void lock(); |
| bool try_lock(); |
| void unlock(); |
| |
| typedef pthread_mutex_t* native_handle_type; |
| native_handle_type native_handle(); |
| }; |
| |
| class recursive_mutex |
| { |
| public: |
| recursive_mutex(); |
| ~recursive_mutex(); |
| |
| recursive_mutex(const recursive_mutex&) = delete; |
| recursive_mutex& operator=(const recursive_mutex&) = delete; |
| |
| void lock(); |
| bool try_lock(); |
| void unlock(); |
| |
| typedef pthread_mutex_t* native_handle_type; |
| native_handle_type native_handle(); |
| }; |
| |
| class timed_mutex |
| { |
| public: |
| timed_mutex(); |
| ~timed_mutex(); |
| |
| timed_mutex(const timed_mutex&) = delete; |
| timed_mutex& operator=(const timed_mutex&) = delete; |
| |
| void lock(); |
| bool try_lock(); |
| template <class Rep, class Period> |
| bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
| template <class Clock, class Duration> |
| bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
| void unlock(); |
| }; |
| |
| class recursive_timed_mutex |
| { |
| public: |
| recursive_timed_mutex(); |
| ~recursive_timed_mutex(); |
| |
| recursive_timed_mutex(const recursive_timed_mutex&) = delete; |
| recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete; |
| |
| void lock(); |
| bool try_lock(); |
| template <class Rep, class Period> |
| bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
| template <class Clock, class Duration> |
| bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
| void unlock(); |
| }; |
| |
| struct defer_lock_t {}; |
| struct try_to_lock_t {}; |
| struct adopt_lock_t {}; |
| |
| constexpr defer_lock_t defer_lock{}; |
| constexpr try_to_lock_t try_to_lock{}; |
| constexpr adopt_lock_t adopt_lock{}; |
| |
| template <class Mutex> |
| class lock_guard |
| { |
| public: |
| typedef Mutex mutex_type; |
| |
| explicit lock_guard(mutex_type& m); |
| lock_guard(mutex_type& m, adopt_lock_t); |
| ~lock_guard(); |
| |
| lock_guard(lock_guard const&) = delete; |
| lock_guard& operator=(lock_guard const&) = delete; |
| }; |
| |
| template <class Mutex> |
| class unique_lock |
| { |
| public: |
| typedef Mutex mutex_type; |
| unique_lock(); |
| explicit unique_lock(mutex_type& m); |
| unique_lock(mutex_type& m, defer_lock_t); |
| unique_lock(mutex_type& m, try_to_lock_t); |
| unique_lock(mutex_type& m, adopt_lock_t); |
| template <class Clock, class Duration> |
| unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time); |
| template <class Rep, class Period> |
| unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time); |
| ~unique_lock(); |
| |
| unique_lock(unique_lock const&) = delete; |
| unique_lock& operator=(unique_lock const&) = delete; |
| |
| unique_lock(unique_lock&& u); |
| unique_lock& operator=(unique_lock&& u); |
| |
| void lock(); |
| bool try_lock(); |
| |
| template <class Rep, class Period> |
| bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
| template <class Clock, class Duration> |
| bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
| |
| void unlock(); |
| |
| void swap(unique_lock& u); |
| mutex_type* release(); |
| |
| bool owns_lock() const; |
| explicit operator bool () const; |
| mutex_type* mutex() const; |
| }; |
| |
| template <class Mutex> |
| void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y); |
| |
| template <class L1, class L2, class... L3> |
| int try_lock(L1&, L2&, L3&...); |
| template <class L1, class L2, class... L3> |
| void lock(L1&, L2&, L3&...); |
| |
| struct once_flag |
| { |
| constexpr once_flag(); |
| |
| once_flag(const once_flag&) = delete; |
| once_flag& operator=(const once_flag&) = delete; |
| }; |
| |
| template<class Callable, class ...Args> |
| void call_once(once_flag& flag, Callable&& func, Args&&... args); |
| |
| } // std |
| |
| */ |
| |
| #include <__config> |
| #include <__mutex_base> |
| #include <functional> |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| #include <tuple> |
| #endif |
| |
| #pragma GCC system_header |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| class _LIBCPP_VISIBLE recursive_mutex |
| { |
| pthread_mutex_t __m_; |
| |
| public: |
| recursive_mutex(); |
| ~recursive_mutex(); |
| |
| private: |
| recursive_mutex(const recursive_mutex&); // = delete; |
| recursive_mutex& operator=(const recursive_mutex&); // = delete; |
| |
| public: |
| void lock(); |
| bool try_lock(); |
| void unlock(); |
| |
| typedef pthread_mutex_t* native_handle_type; |
| _LIBCPP_INLINE_VISIBILITY |
| native_handle_type native_handle() {return &__m_;} |
| }; |
| |
| class _LIBCPP_VISIBLE timed_mutex |
| { |
| mutex __m_; |
| condition_variable __cv_; |
| bool __locked_; |
| public: |
| timed_mutex(); |
| ~timed_mutex(); |
| |
| private: |
| timed_mutex(const timed_mutex&); // = delete; |
| timed_mutex& operator=(const timed_mutex&); // = delete; |
| |
| public: |
| void lock(); |
| bool try_lock(); |
| template <class _Rep, class _Period> |
| _LIBCPP_INLINE_VISIBILITY |
| bool try_lock_for(const chrono::duration<_Rep, _Period>& __d) |
| {return try_lock_until(chrono::steady_clock::now() + __d);} |
| template <class _Clock, class _Duration> |
| bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); |
| void unlock(); |
| }; |
| |
| template <class _Clock, class _Duration> |
| bool |
| timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) |
| { |
| using namespace chrono; |
| unique_lock<mutex> __lk(__m_); |
| bool no_timeout = _Clock::now() < __t; |
| while (no_timeout && __locked_) |
| no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout; |
| if (!__locked_) |
| { |
| __locked_ = true; |
| return true; |
| } |
| return false; |
| } |
| |
| class _LIBCPP_VISIBLE recursive_timed_mutex |
| { |
| mutex __m_; |
| condition_variable __cv_; |
| size_t __count_; |
| pthread_t __id_; |
| public: |
| recursive_timed_mutex(); |
| ~recursive_timed_mutex(); |
| |
| private: |
| recursive_timed_mutex(const recursive_timed_mutex&); // = delete; |
| recursive_timed_mutex& operator=(const recursive_timed_mutex&); // = delete; |
| |
| public: |
| void lock(); |
| bool try_lock(); |
| template <class _Rep, class _Period> |
| _LIBCPP_INLINE_VISIBILITY |
| bool try_lock_for(const chrono::duration<_Rep, _Period>& __d) |
| {return try_lock_until(chrono::steady_clock::now() + __d);} |
| template <class _Clock, class _Duration> |
| bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); |
| void unlock(); |
| }; |
| |
| template <class _Clock, class _Duration> |
| bool |
| recursive_timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) |
| { |
| using namespace chrono; |
| pthread_t __id = pthread_self(); |
| unique_lock<mutex> lk(__m_); |
| if (pthread_equal(__id, __id_)) |
| { |
| if (__count_ == numeric_limits<size_t>::max()) |
| return false; |
| ++__count_; |
| return true; |
| } |
| bool no_timeout = _Clock::now() < __t; |
| while (no_timeout && __count_ != 0) |
| no_timeout = __cv_.wait_until(lk, __t) == cv_status::no_timeout; |
| if (__count_ == 0) |
| { |
| __count_ = 1; |
| __id_ = __id; |
| return true; |
| } |
| return false; |
| } |
| |
| template <class _L0, class _L1> |
| int |
| try_lock(_L0& __l0, _L1& __l1) |
| { |
| unique_lock<_L0> __u0(__l0, try_to_lock); |
| if (__u0.owns_lock()) |
| { |
| if (__l1.try_lock()) |
| { |
| __u0.release(); |
| return -1; |
| } |
| else |
| return 1; |
| } |
| return 0; |
| } |
| |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| |
| template <class _L0, class _L1, class _L2, class... _L3> |
| int |
| try_lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3&... __l3) |
| { |
| int __r = 0; |
| unique_lock<_L0> __u0(__l0, try_to_lock); |
| if (__u0.owns_lock()) |
| { |
| __r = try_lock(__l1, __l2, __l3...); |
| if (__r == -1) |
| __u0.release(); |
| else |
| ++__r; |
| } |
| return __r; |
| } |
| |
| #endif // _LIBCPP_HAS_NO_VARIADICS |
| |
| template <class _L0, class _L1> |
| void |
| lock(_L0& __l0, _L1& __l1) |
| { |
| while (true) |
| { |
| { |
| unique_lock<_L0> __u0(__l0); |
| if (__l1.try_lock()) |
| { |
| __u0.release(); |
| break; |
| } |
| } |
| sched_yield(); |
| { |
| unique_lock<_L1> __u1(__l1); |
| if (__l0.try_lock()) |
| { |
| __u1.release(); |
| break; |
| } |
| } |
| sched_yield(); |
| } |
| } |
| |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| |
| template <class _L0, class _L1, class _L2, class ..._L3> |
| void |
| __lock_first(int __i, _L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3) |
| { |
| while (true) |
| { |
| switch (__i) |
| { |
| case 0: |
| { |
| unique_lock<_L0> __u0(__l0); |
| __i = try_lock(__l1, __l2, __l3...); |
| if (__i == -1) |
| { |
| __u0.release(); |
| return; |
| } |
| } |
| ++__i; |
| sched_yield(); |
| break; |
| case 1: |
| { |
| unique_lock<_L1> __u1(__l1); |
| __i = try_lock(__l2, __l3..., __l0); |
| if (__i == -1) |
| { |
| __u1.release(); |
| return; |
| } |
| } |
| if (__i == sizeof...(_L3) + 1) |
| __i = 0; |
| else |
| __i += 2; |
| sched_yield(); |
| break; |
| default: |
| __lock_first(__i - 2, __l2, __l3..., __l0, __l1); |
| return; |
| } |
| } |
| } |
| |
| template <class _L0, class _L1, class _L2, class ..._L3> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3) |
| { |
| __lock_first(0, __l0, __l1, __l2, __l3...); |
| } |
| |
| #endif // _LIBCPP_HAS_NO_VARIADICS |
| |
| struct once_flag; |
| |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| |
| template<class _Callable, class... _Args> |
| void call_once(once_flag&, _Callable&&, _Args&&...); |
| |
| #else // _LIBCPP_HAS_NO_VARIADICS |
| |
| template<class _Callable> |
| void call_once(once_flag&, _Callable); |
| |
| #endif // _LIBCPP_HAS_NO_VARIADICS |
| |
| struct _LIBCPP_VISIBLE once_flag |
| { |
| _LIBCPP_INLINE_VISIBILITY |
| // constexpr |
| once_flag() {} |
| |
| private: |
| once_flag(const once_flag&); // = delete; |
| once_flag& operator=(const once_flag&); // = delete; |
| |
| unsigned long __state_; |
| |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| template<class _Callable, class... _Args> |
| friend |
| void call_once(once_flag&, _Callable&&, _Args&&...); |
| #else // _LIBCPP_HAS_NO_VARIADICS |
| template<class _Callable> |
| friend |
| void call_once(once_flag&, _Callable); |
| #endif // _LIBCPP_HAS_NO_VARIADICS |
| }; |
| |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| |
| template <class _F> |
| class __call_once_param |
| { |
| _F __f_; |
| public: |
| #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
| _LIBCPP_INLINE_VISIBILITY |
| explicit __call_once_param(_F&& __f) : __f_(_VSTD::move(__f)) {} |
| #else |
| _LIBCPP_INLINE_VISIBILITY |
| explicit __call_once_param(const _F& __f) : __f_(__f) {} |
| #endif |
| |
| _LIBCPP_INLINE_VISIBILITY |
| void operator()() |
| { |
| typedef typename __make_tuple_indices<tuple_size<_F>::value, 1>::type _Index; |
| __execute(_Index()); |
| } |
| |
| private: |
| template <size_t ..._Indices> |
| _LIBCPP_INLINE_VISIBILITY |
| void __execute(__tuple_indices<_Indices...>) |
| { |
| __invoke(_VSTD::move(_VSTD::get<0>(__f_)), _VSTD::move(_VSTD::get<_Indices>(__f_))...); |
| } |
| }; |
| |
| #else |
| |
| template <class _F> |
| class __call_once_param |
| { |
| _F __f_; |
| public: |
| #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
| _LIBCPP_INLINE_VISIBILITY |
| explicit __call_once_param(_F&& __f) : __f_(_VSTD::move(__f)) {} |
| #else |
| _LIBCPP_INLINE_VISIBILITY |
| explicit __call_once_param(const _F& __f) : __f_(__f) {} |
| #endif |
| |
| _LIBCPP_INLINE_VISIBILITY |
| void operator()() |
| { |
| __f_(); |
| } |
| }; |
| |
| #endif |
| |
| template <class _F> |
| void |
| __call_once_proxy(void* __vp) |
| { |
| __call_once_param<_F>* __p = static_cast<__call_once_param<_F>*>(__vp); |
| (*__p)(); |
| } |
| |
| void __call_once(volatile unsigned long&, void*, void(*)(void*)); |
| |
| #ifndef _LIBCPP_HAS_NO_VARIADICS |
| |
| template<class _Callable, class... _Args> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| call_once(once_flag& __flag, _Callable&& __func, _Args&&... __args) |
| { |
| if (__builtin_expect(__flag.__state_ , ~0ul) != ~0ul) |
| { |
| typedef tuple<typename decay<_Callable>::type, typename decay<_Args>::type...> _G; |
| __call_once_param<_G> __p(_G(__decay_copy(_VSTD::forward<_Callable>(__func)), |
| __decay_copy(_VSTD::forward<_Args>(__args))...)); |
| __call_once(__flag.__state_, &__p, &__call_once_proxy<_G>); |
| } |
| } |
| |
| #else // _LIBCPP_HAS_NO_VARIADICS |
| |
| template<class _Callable> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| call_once(once_flag& __flag, _Callable __func) |
| { |
| if (__flag.__state_ != ~0ul) |
| { |
| __call_once_param<_Callable> __p(__func); |
| __call_once(__flag.__state_, &__p, &__call_once_proxy<_Callable>); |
| } |
| } |
| |
| #endif // _LIBCPP_HAS_NO_VARIADICS |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_MUTEX |
