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Diffstat (limited to 'contrib/libc++/include/__mutex_base')
| -rw-r--r-- | contrib/libc++/include/__mutex_base | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/contrib/libc++/include/__mutex_base b/contrib/libc++/include/__mutex_base new file mode 100644 index 0000000..5568765 --- /dev/null +++ b/contrib/libc++/include/__mutex_base @@ -0,0 +1,439 @@ +// -*- C++ -*- +//===----------------------------------------------------------------------===// +// +// 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_BASE +#define _LIBCPP___MUTEX_BASE + +#include <__config> +#include <chrono> +#include <system_error> +#include <pthread.h> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +#ifdef _LIBCPP_SHARED_LOCK + +namespace ting { +template <class _Mutex> class shared_lock; +template <class _Mutex> class upgrade_lock; +} + +#endif // _LIBCPP_SHARED_LOCK + + +_LIBCPP_BEGIN_NAMESPACE_STD + +class _LIBCPP_VISIBLE mutex +{ + pthread_mutex_t __m_; + +public: + _LIBCPP_INLINE_VISIBILITY + mutex() {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;} + ~mutex(); + +private: + mutex(const mutex&);// = delete; + mutex& operator=(const 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_;} +}; + +struct _LIBCPP_VISIBLE defer_lock_t {}; +struct _LIBCPP_VISIBLE try_to_lock_t {}; +struct _LIBCPP_VISIBLE adopt_lock_t {}; + +//constexpr +extern const +defer_lock_t defer_lock; + +//constexpr +extern const +try_to_lock_t try_to_lock; + +//constexpr +extern const +adopt_lock_t adopt_lock; + +template <class _Mutex> +class _LIBCPP_VISIBLE lock_guard +{ +public: + typedef _Mutex mutex_type; + +private: + mutex_type& __m_; +public: + + _LIBCPP_INLINE_VISIBILITY + explicit lock_guard(mutex_type& __m) + : __m_(__m) {__m_.lock();} + _LIBCPP_INLINE_VISIBILITY + lock_guard(mutex_type& __m, adopt_lock_t) + : __m_(__m) {} + _LIBCPP_INLINE_VISIBILITY + ~lock_guard() {__m_.unlock();} + +private: + lock_guard(lock_guard const&);// = delete; + lock_guard& operator=(lock_guard const&);// = delete; +}; + +template <class _Mutex> +class _LIBCPP_VISIBLE unique_lock +{ +public: + typedef _Mutex mutex_type; + +private: + mutex_type* __m_; + bool __owns_; + +public: + _LIBCPP_INLINE_VISIBILITY + unique_lock() : __m_(nullptr), __owns_(false) {} + _LIBCPP_INLINE_VISIBILITY + explicit unique_lock(mutex_type& __m) + : __m_(&__m), __owns_(true) {__m_->lock();} + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, defer_lock_t) + : __m_(&__m), __owns_(false) {} + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, try_to_lock_t) + : __m_(&__m), __owns_(__m.try_lock()) {} + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, adopt_lock_t) + : __m_(&__m), __owns_(true) {} + template <class _Clock, class _Duration> + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t) + : __m_(&__m), __owns_(__m.try_lock_until(__t)) {} + template <class _Rep, class _Period> + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d) + : __m_(&__m), __owns_(__m.try_lock_for(__d)) {} + _LIBCPP_INLINE_VISIBILITY + ~unique_lock() + { + if (__owns_) + __m_->unlock(); + } + +private: + unique_lock(unique_lock const&); // = delete; + unique_lock& operator=(unique_lock const&); // = delete; + +public: +#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES + _LIBCPP_INLINE_VISIBILITY + unique_lock(unique_lock&& __u) + : __m_(__u.__m_), __owns_(__u.__owns_) + {__u.__m_ = nullptr; __u.__owns_ = false;} + _LIBCPP_INLINE_VISIBILITY + unique_lock& operator=(unique_lock&& __u) + { + if (__owns_) + __m_->unlock(); + __m_ = __u.__m_; + __owns_ = __u.__owns_; + __u.__m_ = nullptr; + __u.__owns_ = false; + return *this; + } + +#ifdef _LIBCPP_SHARED_LOCK + + unique_lock(ting::shared_lock<mutex_type>&&, try_to_lock_t); + template <class _Clock, class _Duration> + unique_lock(ting::shared_lock<mutex_type>&&, + const chrono::time_point<_Clock, _Duration>&); + template <class _Rep, class _Period> + unique_lock(ting::shared_lock<mutex_type>&&, + const chrono::duration<_Rep, _Period>&); + + explicit unique_lock(ting::upgrade_lock<mutex_type>&&); + unique_lock(ting::upgrade_lock<mutex_type>&&, try_to_lock_t); + template <class _Clock, class _Duration> + unique_lock(ting::upgrade_lock<mutex_type>&&, + const chrono::time_point<_Clock, _Duration>&); + template <class _Rep, class _Period> + unique_lock(ting::upgrade_lock<mutex_type>&&, + const chrono::duration<_Rep, _Period>&); + +#endif // _LIBCPP_SHARED_LOCK + +#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES + + void lock(); + bool try_lock(); + + template <class _Rep, class _Period> + bool try_lock_for(const chrono::duration<_Rep, _Period>& __d); + template <class _Clock, class _Duration> + bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); + + void unlock(); + + _LIBCPP_INLINE_VISIBILITY + void swap(unique_lock& __u) + { + _VSTD::swap(__m_, __u.__m_); + _VSTD::swap(__owns_, __u.__owns_); + } + _LIBCPP_INLINE_VISIBILITY + mutex_type* release() + { + mutex_type* __m = __m_; + __m_ = nullptr; + __owns_ = false; + return __m; + } + + _LIBCPP_INLINE_VISIBILITY + bool owns_lock() const {return __owns_;} + _LIBCPP_INLINE_VISIBILITY +// explicit + operator bool () const {return __owns_;} + _LIBCPP_INLINE_VISIBILITY + mutex_type* mutex() const {return __m_;} +}; + +template <class _Mutex> +void +unique_lock<_Mutex>::lock() +{ + if (__m_ == nullptr) + __throw_system_error(EPERM, "unique_lock::lock: references null mutex"); + if (__owns_) + __throw_system_error(EDEADLK, "unique_lock::lock: already locked"); + __m_->lock(); + __owns_ = true; +} + +template <class _Mutex> +bool +unique_lock<_Mutex>::try_lock() +{ + if (__m_ == nullptr) + __throw_system_error(EPERM, "unique_lock::try_lock: references null mutex"); + if (__owns_) + __throw_system_error(EDEADLK, "unique_lock::try_lock: already locked"); + __owns_ = __m_->try_lock(); + return __owns_; +} + +template <class _Mutex> +template <class _Rep, class _Period> +bool +unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) +{ + if (__m_ == nullptr) + __throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex"); + if (__owns_) + __throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked"); + __owns_ = __m_->try_lock_for(__d); + return __owns_; +} + +template <class _Mutex> +template <class _Clock, class _Duration> +bool +unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) +{ + if (__m_ == nullptr) + __throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex"); + if (__owns_) + __throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked"); + __owns_ = __m_->try_lock_until(__t); + return __owns_; +} + +template <class _Mutex> +void +unique_lock<_Mutex>::unlock() +{ + if (!__owns_) + __throw_system_error(EPERM, "unique_lock::unlock: not locked"); + __m_->unlock(); + __owns_ = false; +} + +template <class _Mutex> +inline _LIBCPP_INLINE_VISIBILITY +void +swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) {__x.swap(__y);} + +struct _LIBCPP_VISIBLE cv_status +{ + enum _ { + no_timeout, + timeout + }; + + _ __v_; + + _LIBCPP_INLINE_VISIBILITY cv_status(_ __v) : __v_(__v) {} + _LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} + +}; + +class _LIBCPP_VISIBLE condition_variable +{ + pthread_cond_t __cv_; +public: + _LIBCPP_INLINE_VISIBILITY + condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;} + ~condition_variable(); + +private: + condition_variable(const condition_variable&); // = delete; + condition_variable& operator=(const condition_variable&); // = delete; + +public: + void notify_one(); + void notify_all(); + + void wait(unique_lock<mutex>& __lk); + template <class _Predicate> + void wait(unique_lock<mutex>& __lk, _Predicate __pred); + + template <class _Duration> + cv_status + wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<chrono::system_clock, _Duration>& __t); + + template <class _Clock, class _Duration> + cv_status + wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<_Clock, _Duration>& __t); + + template <class _Clock, class _Duration, class _Predicate> + bool + wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<_Clock, _Duration>& __t, + _Predicate __pred); + + template <class _Rep, class _Period> + cv_status + wait_for(unique_lock<mutex>& __lk, + const chrono::duration<_Rep, _Period>& __d); + + template <class _Rep, class _Period, class _Predicate> + bool + wait_for(unique_lock<mutex>& __lk, + const chrono::duration<_Rep, _Period>& __d, + _Predicate __pred); + + typedef pthread_cond_t* native_handle_type; + _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;} + +private: + void __do_timed_wait(unique_lock<mutex>& __lk, + chrono::time_point<chrono::system_clock, chrono::nanoseconds>); +}; + +template <class _To, class _Rep, class _Period> +inline _LIBCPP_INLINE_VISIBILITY +typename enable_if +< + chrono::__is_duration<_To>::value, + _To +>::type +__ceil(chrono::duration<_Rep, _Period> __d) +{ + using namespace chrono; + _To __r = duration_cast<_To>(__d); + if (__r < __d) + ++__r; + return __r; +} + +template <class _Predicate> +void +condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) +{ + while (!__pred()) + wait(__lk); +} + +template <class _Duration> +cv_status +condition_variable::wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<chrono::system_clock, _Duration>& __t) +{ + using namespace chrono; + typedef time_point<system_clock, nanoseconds> __nano_sys_tmpt; + __do_timed_wait(__lk, + __nano_sys_tmpt(__ceil<nanoseconds>(__t.time_since_epoch()))); + return system_clock::now() < __t ? cv_status::no_timeout : + cv_status::timeout; +} + +template <class _Clock, class _Duration> +cv_status +condition_variable::wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<_Clock, _Duration>& __t) +{ + using namespace chrono; + system_clock::time_point __s_now = system_clock::now(); + typename _Clock::time_point __c_now = _Clock::now(); + __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__t - __c_now)); + return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout; +} + +template <class _Clock, class _Duration, class _Predicate> +bool +condition_variable::wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<_Clock, _Duration>& __t, + _Predicate __pred) +{ + while (!__pred()) + { + if (wait_until(__lk, __t) == cv_status::timeout) + return __pred(); + } + return true; +} + +template <class _Rep, class _Period> +cv_status +condition_variable::wait_for(unique_lock<mutex>& __lk, + const chrono::duration<_Rep, _Period>& __d) +{ + using namespace chrono; + system_clock::time_point __s_now = system_clock::now(); + steady_clock::time_point __c_now = steady_clock::now(); + __do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d)); + return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : + cv_status::timeout; +} + +template <class _Rep, class _Period, class _Predicate> +inline _LIBCPP_INLINE_VISIBILITY +bool +condition_variable::wait_for(unique_lock<mutex>& __lk, + const chrono::duration<_Rep, _Period>& __d, + _Predicate __pred) +{ + return wait_until(__lk, chrono::steady_clock::now() + __d, + _VSTD::move(__pred)); +} + +_LIBCPP_END_NAMESPACE_STD + +#endif // _LIBCPP___MUTEX_BASE |
