diff options
Diffstat (limited to 'current/sources/cxx-stl/llvm-libc++/include/__mutex_base')
| -rw-r--r-- | current/sources/cxx-stl/llvm-libc++/include/__mutex_base | 532 |
1 files changed, 532 insertions, 0 deletions
diff --git a/current/sources/cxx-stl/llvm-libc++/include/__mutex_base b/current/sources/cxx-stl/llvm-libc++/include/__mutex_base new file mode 100644 index 000000000..8b4b74802 --- /dev/null +++ b/current/sources/cxx-stl/llvm-libc++/include/__mutex_base @@ -0,0 +1,532 @@ +// -*- C++ -*- +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___MUTEX_BASE +#define _LIBCPP___MUTEX_BASE + +#include <__config> +#include <chrono> +#include <system_error> +#include <__threading_support> + +#include <time.h> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + + +_LIBCPP_BEGIN_NAMESPACE_STD + +#ifndef _LIBCPP_HAS_NO_THREADS + +class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex +{ + __libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER; + +public: + _LIBCPP_INLINE_VISIBILITY + _LIBCPP_CONSTEXPR mutex() = default; + + mutex(const mutex&) = delete; + mutex& operator=(const mutex&) = delete; + +#if defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION) + ~mutex() = default; +#else + ~mutex() _NOEXCEPT; +#endif + + void lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability()); + bool try_lock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(try_acquire_capability(true)); + void unlock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()); + + typedef __libcpp_mutex_t* native_handle_type; + _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;} +}; + +static_assert(is_nothrow_default_constructible<mutex>::value, + "the default constructor for std::mutex must be nothrow"); + +struct _LIBCPP_TYPE_VIS defer_lock_t { explicit defer_lock_t() = default; }; +struct _LIBCPP_TYPE_VIS try_to_lock_t { explicit try_to_lock_t() = default; }; +struct _LIBCPP_TYPE_VIS adopt_lock_t { explicit adopt_lock_t() = default; }; + +#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY) + +extern _LIBCPP_EXPORTED_FROM_ABI const defer_lock_t defer_lock; +extern _LIBCPP_EXPORTED_FROM_ABI const try_to_lock_t try_to_lock; +extern _LIBCPP_EXPORTED_FROM_ABI const adopt_lock_t adopt_lock; + +#else + +/* _LIBCPP_INLINE_VAR */ constexpr defer_lock_t defer_lock = defer_lock_t(); +/* _LIBCPP_INLINE_VAR */ constexpr try_to_lock_t try_to_lock = try_to_lock_t(); +/* _LIBCPP_INLINE_VAR */ constexpr adopt_lock_t adopt_lock = adopt_lock_t(); + +#endif + +template <class _Mutex> +class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable) +lock_guard +{ +public: + typedef _Mutex mutex_type; + +private: + mutex_type& __m_; +public: + + _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY + explicit lock_guard(mutex_type& __m) _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m)) + : __m_(__m) {__m_.lock();} + + _LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY + lock_guard(mutex_type& __m, adopt_lock_t) _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m)) + : __m_(__m) {} + _LIBCPP_INLINE_VISIBILITY + ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) {__m_.unlock();} + +private: + lock_guard(lock_guard const&) _LIBCPP_EQUAL_DELETE; + lock_guard& operator=(lock_guard const&) _LIBCPP_EQUAL_DELETE; +}; + +template <class _Mutex> +class _LIBCPP_TEMPLATE_VIS unique_lock +{ +public: + typedef _Mutex mutex_type; + +private: + mutex_type* __m_; + bool __owns_; + +public: + _LIBCPP_INLINE_VISIBILITY + unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {} + _LIBCPP_INLINE_VISIBILITY + explicit unique_lock(mutex_type& __m) + : __m_(_VSTD::addressof(__m)), __owns_(true) {__m_->lock();} + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT + : __m_(_VSTD::addressof(__m)), __owns_(false) {} + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, try_to_lock_t) + : __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock()) {} + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, adopt_lock_t) + : __m_(_VSTD::addressof(__m)), __owns_(true) {} + template <class _Clock, class _Duration> + _LIBCPP_INLINE_VISIBILITY + unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t) + : __m_(_VSTD::addressof(__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_(_VSTD::addressof(__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_CXX03_LANG + _LIBCPP_INLINE_VISIBILITY + unique_lock(unique_lock&& __u) _NOEXCEPT + : __m_(__u.__m_), __owns_(__u.__owns_) + {__u.__m_ = nullptr; __u.__owns_ = false;} + _LIBCPP_INLINE_VISIBILITY + unique_lock& operator=(unique_lock&& __u) _NOEXCEPT + { + if (__owns_) + __m_->unlock(); + __m_ = __u.__m_; + __owns_ = __u.__owns_; + __u.__m_ = nullptr; + __u.__owns_ = false; + return *this; + } + +#endif // _LIBCPP_CXX03_LANG + + 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) _NOEXCEPT + { + _VSTD::swap(__m_, __u.__m_); + _VSTD::swap(__owns_, __u.__owns_); + } + _LIBCPP_INLINE_VISIBILITY + mutex_type* release() _NOEXCEPT + { + mutex_type* __m = __m_; + __m_ = nullptr; + __owns_ = false; + return __m; + } + + _LIBCPP_INLINE_VISIBILITY + bool owns_lock() const _NOEXCEPT {return __owns_;} + _LIBCPP_INLINE_VISIBILITY + _LIBCPP_EXPLICIT + operator bool () const _NOEXCEPT {return __owns_;} + _LIBCPP_INLINE_VISIBILITY + mutex_type* mutex() const _NOEXCEPT {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) _NOEXCEPT + {__x.swap(__y);} + +//enum class cv_status +_LIBCPP_DECLARE_STRONG_ENUM(cv_status) +{ + no_timeout, + timeout +}; +_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(cv_status) + +class _LIBCPP_TYPE_VIS condition_variable +{ + __libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER; +public: + _LIBCPP_INLINE_VISIBILITY + _LIBCPP_CONSTEXPR condition_variable() _NOEXCEPT = default; + +#ifdef _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION + ~condition_variable() = default; +#else + ~condition_variable(); +#endif + + condition_variable(const condition_variable&) = delete; + condition_variable& operator=(const condition_variable&) = delete; + + void notify_one() _NOEXCEPT; + void notify_all() _NOEXCEPT; + + void wait(unique_lock<mutex>& __lk) _NOEXCEPT; + template <class _Predicate> + _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS + void wait(unique_lock<mutex>& __lk, _Predicate __pred); + + template <class _Clock, class _Duration> + _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS + cv_status + wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<_Clock, _Duration>& __t); + + template <class _Clock, class _Duration, class _Predicate> + _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS + bool + wait_until(unique_lock<mutex>& __lk, + const chrono::time_point<_Clock, _Duration>& __t, + _Predicate __pred); + + template <class _Rep, class _Period> + _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS + cv_status + wait_for(unique_lock<mutex>& __lk, + const chrono::duration<_Rep, _Period>& __d); + + template <class _Rep, class _Period, class _Predicate> + bool + _LIBCPP_INLINE_VISIBILITY + wait_for(unique_lock<mutex>& __lk, + const chrono::duration<_Rep, _Period>& __d, + _Predicate __pred); + + typedef __libcpp_condvar_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>) _NOEXCEPT; +#if defined(_LIBCPP_HAS_COND_CLOCKWAIT) + void __do_timed_wait(unique_lock<mutex>& __lk, + chrono::time_point<chrono::steady_clock, chrono::nanoseconds>) _NOEXCEPT; +#endif + template <class _Clock> + void __do_timed_wait(unique_lock<mutex>& __lk, + chrono::time_point<_Clock, chrono::nanoseconds>) _NOEXCEPT; +}; +#endif // !_LIBCPP_HAS_NO_THREADS + +template <class _Rep, class _Period> +inline _LIBCPP_INLINE_VISIBILITY +typename enable_if +< + is_floating_point<_Rep>::value, + chrono::nanoseconds +>::type +__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d) +{ + using namespace chrono; + using __ratio = ratio_divide<_Period, nano>; + using __ns_rep = nanoseconds::rep; + _Rep __result_float = __d.count() * __ratio::num / __ratio::den; + + _Rep __result_max = numeric_limits<__ns_rep>::max(); + if (__result_float >= __result_max) { + return nanoseconds::max(); + } + + _Rep __result_min = numeric_limits<__ns_rep>::min(); + if (__result_float <= __result_min) { + return nanoseconds::min(); + } + + return nanoseconds(static_cast<__ns_rep>(__result_float)); +} + +template <class _Rep, class _Period> +inline _LIBCPP_INLINE_VISIBILITY +typename enable_if +< + !is_floating_point<_Rep>::value, + chrono::nanoseconds +>::type +__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d) +{ + using namespace chrono; + if (__d.count() == 0) { + return nanoseconds(0); + } + + using __ratio = ratio_divide<_Period, nano>; + using __ns_rep = nanoseconds::rep; + __ns_rep __result_max = std::numeric_limits<__ns_rep>::max(); + if (__d.count() > 0 && __d.count() > __result_max / __ratio::num) { + return nanoseconds::max(); + } + + __ns_rep __result_min = std::numeric_limits<__ns_rep>::min(); + if (__d.count() < 0 && __d.count() < __result_min / __ratio::num) { + return nanoseconds::min(); + } + + __ns_rep __result = __d.count() * __ratio::num / __ratio::den; + if (__result == 0) { + return nanoseconds(1); + } + + return nanoseconds(__result); +} + +#ifndef _LIBCPP_HAS_NO_THREADS +template <class _Predicate> +void +condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred) +{ + while (!__pred()) + wait(__lk); +} + +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; + using __clock_tp_ns = time_point<_Clock, nanoseconds>; + + typename _Clock::time_point __now = _Clock::now(); + if (__t <= __now) + return cv_status::timeout; + + __clock_tp_ns __t_ns = __clock_tp_ns(__safe_nanosecond_cast(__t.time_since_epoch())); + + __do_timed_wait(__lk, __t_ns); + 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; + if (__d <= __d.zero()) + return cv_status::timeout; + using __ns_rep = nanoseconds::rep; + steady_clock::time_point __c_now = steady_clock::now(); + +#if defined(_LIBCPP_HAS_COND_CLOCKWAIT) + using __clock_tp_ns = time_point<steady_clock, nanoseconds>; + __ns_rep __now_count_ns = __safe_nanosecond_cast(__c_now.time_since_epoch()).count(); +#else + using __clock_tp_ns = time_point<system_clock, nanoseconds>; + __ns_rep __now_count_ns = __safe_nanosecond_cast(system_clock::now().time_since_epoch()).count(); +#endif + + __ns_rep __d_ns_count = __safe_nanosecond_cast(__d).count(); + + if (__now_count_ns > numeric_limits<__ns_rep>::max() - __d_ns_count) { + __do_timed_wait(__lk, __clock_tp_ns::max()); + } else { + __do_timed_wait(__lk, __clock_tp_ns(nanoseconds(__now_count_ns + __d_ns_count))); + } + + return steady_clock::now() - __c_now < __d ? cv_status::no_timeout : + cv_status::timeout; +} + +template <class _Rep, class _Period, class _Predicate> +inline +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)); +} + +#if defined(_LIBCPP_HAS_COND_CLOCKWAIT) +inline +void +condition_variable::__do_timed_wait(unique_lock<mutex>& __lk, + chrono::time_point<chrono::steady_clock, chrono::nanoseconds> __tp) _NOEXCEPT +{ + using namespace chrono; + if (!__lk.owns_lock()) + __throw_system_error(EPERM, + "condition_variable::timed wait: mutex not locked"); + nanoseconds __d = __tp.time_since_epoch(); + timespec __ts; + seconds __s = duration_cast<seconds>(__d); + using __ts_sec = decltype(__ts.tv_sec); + const __ts_sec __ts_sec_max = numeric_limits<__ts_sec>::max(); + if (__s.count() < __ts_sec_max) + { + __ts.tv_sec = static_cast<__ts_sec>(__s.count()); + __ts.tv_nsec = (__d - __s).count(); + } + else + { + __ts.tv_sec = __ts_sec_max; + __ts.tv_nsec = giga::num - 1; + } + int __ec = pthread_cond_clockwait(&__cv_, __lk.mutex()->native_handle(), CLOCK_MONOTONIC, &__ts); + if (__ec != 0 && __ec != ETIMEDOUT) + __throw_system_error(__ec, "condition_variable timed_wait failed"); +} +#endif // _LIBCPP_HAS_COND_CLOCKWAIT + +template <class _Clock> +inline +void +condition_variable::__do_timed_wait(unique_lock<mutex>& __lk, + chrono::time_point<_Clock, chrono::nanoseconds> __tp) _NOEXCEPT +{ + wait_for(__lk, __tp - _Clock::now()); +} + +#endif // !_LIBCPP_HAS_NO_THREADS + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___MUTEX_BASE |