mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-12-02 18:58:15 +00:00
368faacac7
This commit reverts5aaefa51(and also partly7f285f48e7andb6d75682f9, which were related to the original commit). As landed,5aaefa51had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
530 lines
16 KiB
C++
530 lines
16 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MUTEX_BASE
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#define _LIBCPP___MUTEX_BASE
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#include <__chrono/duration.h>
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#include <__chrono/steady_clock.h>
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#include <__chrono/system_clock.h>
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#include <__chrono/time_point.h>
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#include <__config>
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#include <__threading_support>
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#include <ratio>
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#include <system_error>
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#include <time.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#ifndef _LIBCPP_HAS_NO_THREADS
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class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex
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{
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__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
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public:
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR mutex() = default;
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mutex(const mutex&) = delete;
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mutex& operator=(const mutex&) = delete;
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#if defined(_LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION)
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~mutex() = default;
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#else
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~mutex() _NOEXCEPT;
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#endif
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void lock() _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability());
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bool try_lock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(try_acquire_capability(true));
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void unlock() _NOEXCEPT _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability());
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typedef __libcpp_mutex_t* native_handle_type;
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_LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__m_;}
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};
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static_assert(is_nothrow_default_constructible<mutex>::value,
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"the default constructor for std::mutex must be nothrow");
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struct _LIBCPP_TYPE_VIS defer_lock_t { explicit defer_lock_t() = default; };
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struct _LIBCPP_TYPE_VIS try_to_lock_t { explicit try_to_lock_t() = default; };
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struct _LIBCPP_TYPE_VIS adopt_lock_t { explicit adopt_lock_t() = default; };
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#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
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extern _LIBCPP_EXPORTED_FROM_ABI const defer_lock_t defer_lock;
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extern _LIBCPP_EXPORTED_FROM_ABI const try_to_lock_t try_to_lock;
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extern _LIBCPP_EXPORTED_FROM_ABI const adopt_lock_t adopt_lock;
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#else
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/* inline */ constexpr defer_lock_t defer_lock = defer_lock_t();
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/* inline */ constexpr try_to_lock_t try_to_lock = try_to_lock_t();
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/* inline */ constexpr adopt_lock_t adopt_lock = adopt_lock_t();
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#endif
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template <class _Mutex>
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class _LIBCPP_TEMPLATE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(scoped_lockable)
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lock_guard
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{
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public:
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typedef _Mutex mutex_type;
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private:
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mutex_type& __m_;
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public:
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_LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
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explicit lock_guard(mutex_type& __m) _LIBCPP_THREAD_SAFETY_ANNOTATION(acquire_capability(__m))
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: __m_(__m) {__m_.lock();}
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_LIBCPP_NODISCARD_EXT _LIBCPP_INLINE_VISIBILITY
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lock_guard(mutex_type& __m, adopt_lock_t) _LIBCPP_THREAD_SAFETY_ANNOTATION(requires_capability(__m))
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: __m_(__m) {}
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_LIBCPP_INLINE_VISIBILITY
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~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) {__m_.unlock();}
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private:
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lock_guard(lock_guard const&) = delete;
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lock_guard& operator=(lock_guard const&) = delete;
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};
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template <class _Mutex>
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class _LIBCPP_TEMPLATE_VIS unique_lock
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{
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public:
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typedef _Mutex mutex_type;
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private:
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mutex_type* __m_;
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bool __owns_;
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public:
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_LIBCPP_INLINE_VISIBILITY
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unique_lock() _NOEXCEPT : __m_(nullptr), __owns_(false) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit unique_lock(mutex_type& __m)
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: __m_(_VSTD::addressof(__m)), __owns_(true) {__m_->lock();}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT
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: __m_(_VSTD::addressof(__m)), __owns_(false) {}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, try_to_lock_t)
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: __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock()) {}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, adopt_lock_t)
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: __m_(_VSTD::addressof(__m)), __owns_(true) {}
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template <class _Clock, class _Duration>
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, const chrono::time_point<_Clock, _Duration>& __t)
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: __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock_until(__t)) {}
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template <class _Rep, class _Period>
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(mutex_type& __m, const chrono::duration<_Rep, _Period>& __d)
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: __m_(_VSTD::addressof(__m)), __owns_(__m.try_lock_for(__d)) {}
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_LIBCPP_INLINE_VISIBILITY
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~unique_lock()
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{
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if (__owns_)
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__m_->unlock();
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}
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unique_lock(unique_lock const&) = delete;
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unique_lock& operator=(unique_lock const&) = delete;
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_LIBCPP_INLINE_VISIBILITY
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unique_lock(unique_lock&& __u) _NOEXCEPT
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: __m_(__u.__m_), __owns_(__u.__owns_)
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{__u.__m_ = nullptr; __u.__owns_ = false;}
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_LIBCPP_INLINE_VISIBILITY
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unique_lock& operator=(unique_lock&& __u) _NOEXCEPT
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{
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if (__owns_)
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__m_->unlock();
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__m_ = __u.__m_;
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__owns_ = __u.__owns_;
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__u.__m_ = nullptr;
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__u.__owns_ = false;
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return *this;
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}
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void lock();
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bool try_lock();
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template <class _Rep, class _Period>
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bool try_lock_for(const chrono::duration<_Rep, _Period>& __d);
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template <class _Clock, class _Duration>
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bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t);
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void unlock();
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_LIBCPP_INLINE_VISIBILITY
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void swap(unique_lock& __u) _NOEXCEPT
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{
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_VSTD::swap(__m_, __u.__m_);
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_VSTD::swap(__owns_, __u.__owns_);
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}
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_LIBCPP_INLINE_VISIBILITY
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mutex_type* release() _NOEXCEPT
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{
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mutex_type* __m = __m_;
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__m_ = nullptr;
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__owns_ = false;
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return __m;
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}
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_LIBCPP_INLINE_VISIBILITY
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bool owns_lock() const _NOEXCEPT {return __owns_;}
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_LIBCPP_INLINE_VISIBILITY
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explicit operator bool() const _NOEXCEPT {return __owns_;}
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_LIBCPP_INLINE_VISIBILITY
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mutex_type* mutex() const _NOEXCEPT {return __m_;}
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};
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template <class _Mutex>
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void
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unique_lock<_Mutex>::lock()
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::lock: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::lock: already locked");
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__m_->lock();
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__owns_ = true;
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}
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template <class _Mutex>
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bool
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unique_lock<_Mutex>::try_lock()
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::try_lock: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::try_lock: already locked");
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__owns_ = __m_->try_lock();
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return __owns_;
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}
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template <class _Mutex>
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template <class _Rep, class _Period>
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bool
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unique_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::try_lock_for: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::try_lock_for: already locked");
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__owns_ = __m_->try_lock_for(__d);
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return __owns_;
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}
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template <class _Mutex>
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template <class _Clock, class _Duration>
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bool
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unique_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
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{
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if (__m_ == nullptr)
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__throw_system_error(EPERM, "unique_lock::try_lock_until: references null mutex");
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if (__owns_)
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__throw_system_error(EDEADLK, "unique_lock::try_lock_until: already locked");
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__owns_ = __m_->try_lock_until(__t);
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return __owns_;
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}
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template <class _Mutex>
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void
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unique_lock<_Mutex>::unlock()
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{
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if (!__owns_)
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__throw_system_error(EPERM, "unique_lock::unlock: not locked");
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__m_->unlock();
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__owns_ = false;
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}
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template <class _Mutex>
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inline _LIBCPP_INLINE_VISIBILITY
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void
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swap(unique_lock<_Mutex>& __x, unique_lock<_Mutex>& __y) _NOEXCEPT
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{__x.swap(__y);}
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//enum class cv_status
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_LIBCPP_DECLARE_STRONG_ENUM(cv_status)
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{
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no_timeout,
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timeout
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};
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_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(cv_status)
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class _LIBCPP_TYPE_VIS condition_variable
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{
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__libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
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public:
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR condition_variable() _NOEXCEPT = default;
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#ifdef _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
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~condition_variable() = default;
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#else
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~condition_variable();
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#endif
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condition_variable(const condition_variable&) = delete;
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condition_variable& operator=(const condition_variable&) = delete;
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void notify_one() _NOEXCEPT;
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void notify_all() _NOEXCEPT;
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void wait(unique_lock<mutex>& __lk) _NOEXCEPT;
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template <class _Predicate>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
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void wait(unique_lock<mutex>& __lk, _Predicate __pred);
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template <class _Clock, class _Duration>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
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cv_status
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wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t);
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template <class _Clock, class _Duration, class _Predicate>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
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bool
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wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t,
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_Predicate __pred);
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template <class _Rep, class _Period>
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_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
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cv_status
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wait_for(unique_lock<mutex>& __lk,
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const chrono::duration<_Rep, _Period>& __d);
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template <class _Rep, class _Period, class _Predicate>
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bool
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_LIBCPP_INLINE_VISIBILITY
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wait_for(unique_lock<mutex>& __lk,
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const chrono::duration<_Rep, _Period>& __d,
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_Predicate __pred);
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typedef __libcpp_condvar_t* native_handle_type;
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_LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() {return &__cv_;}
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private:
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void __do_timed_wait(unique_lock<mutex>& __lk,
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chrono::time_point<chrono::system_clock, chrono::nanoseconds>) _NOEXCEPT;
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#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
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void __do_timed_wait(unique_lock<mutex>& __lk,
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chrono::time_point<chrono::steady_clock, chrono::nanoseconds>) _NOEXCEPT;
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#endif
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template <class _Clock>
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void __do_timed_wait(unique_lock<mutex>& __lk,
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chrono::time_point<_Clock, chrono::nanoseconds>) _NOEXCEPT;
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};
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#endif // !_LIBCPP_HAS_NO_THREADS
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template <class _Rep, class _Period>
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inline _LIBCPP_INLINE_VISIBILITY
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typename enable_if
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<
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is_floating_point<_Rep>::value,
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chrono::nanoseconds
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>::type
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__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d)
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{
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using namespace chrono;
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using __ratio = ratio_divide<_Period, nano>;
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using __ns_rep = nanoseconds::rep;
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_Rep __result_float = __d.count() * __ratio::num / __ratio::den;
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_Rep __result_max = numeric_limits<__ns_rep>::max();
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if (__result_float >= __result_max) {
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return nanoseconds::max();
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}
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_Rep __result_min = numeric_limits<__ns_rep>::min();
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if (__result_float <= __result_min) {
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return nanoseconds::min();
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}
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return nanoseconds(static_cast<__ns_rep>(__result_float));
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}
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template <class _Rep, class _Period>
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inline _LIBCPP_INLINE_VISIBILITY
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typename enable_if
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<
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!is_floating_point<_Rep>::value,
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chrono::nanoseconds
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>::type
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__safe_nanosecond_cast(chrono::duration<_Rep, _Period> __d)
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{
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using namespace chrono;
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if (__d.count() == 0) {
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return nanoseconds(0);
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}
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using __ratio = ratio_divide<_Period, nano>;
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using __ns_rep = nanoseconds::rep;
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__ns_rep __result_max = numeric_limits<__ns_rep>::max();
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if (__d.count() > 0 && __d.count() > __result_max / __ratio::num) {
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return nanoseconds::max();
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}
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__ns_rep __result_min = numeric_limits<__ns_rep>::min();
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if (__d.count() < 0 && __d.count() < __result_min / __ratio::num) {
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return nanoseconds::min();
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}
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__ns_rep __result = __d.count() * __ratio::num / __ratio::den;
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if (__result == 0) {
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return nanoseconds(1);
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}
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return nanoseconds(__result);
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}
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#ifndef _LIBCPP_HAS_NO_THREADS
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template <class _Predicate>
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void
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condition_variable::wait(unique_lock<mutex>& __lk, _Predicate __pred)
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{
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while (!__pred())
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wait(__lk);
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}
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template <class _Clock, class _Duration>
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cv_status
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condition_variable::wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t)
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{
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using namespace chrono;
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using __clock_tp_ns = time_point<_Clock, nanoseconds>;
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typename _Clock::time_point __now = _Clock::now();
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if (__t <= __now)
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return cv_status::timeout;
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__clock_tp_ns __t_ns = __clock_tp_ns(_VSTD::__safe_nanosecond_cast(__t.time_since_epoch()));
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__do_timed_wait(__lk, __t_ns);
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return _Clock::now() < __t ? cv_status::no_timeout : cv_status::timeout;
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}
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template <class _Clock, class _Duration, class _Predicate>
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bool
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condition_variable::wait_until(unique_lock<mutex>& __lk,
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const chrono::time_point<_Clock, _Duration>& __t,
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_Predicate __pred)
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{
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while (!__pred())
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{
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if (wait_until(__lk, __t) == cv_status::timeout)
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return __pred();
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}
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return true;
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}
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template <class _Rep, class _Period>
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cv_status
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condition_variable::wait_for(unique_lock<mutex>& __lk,
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const chrono::duration<_Rep, _Period>& __d)
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{
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using namespace chrono;
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if (__d <= __d.zero())
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return cv_status::timeout;
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using __ns_rep = nanoseconds::rep;
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steady_clock::time_point __c_now = steady_clock::now();
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#if defined(_LIBCPP_HAS_COND_CLOCKWAIT)
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using __clock_tp_ns = time_point<steady_clock, nanoseconds>;
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__ns_rep __now_count_ns = _VSTD::__safe_nanosecond_cast(__c_now.time_since_epoch()).count();
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#else
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using __clock_tp_ns = time_point<system_clock, nanoseconds>;
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__ns_rep __now_count_ns = _VSTD::__safe_nanosecond_cast(system_clock::now().time_since_epoch()).count();
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#endif
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__ns_rep __d_ns_count = _VSTD::__safe_nanosecond_cast(__d).count();
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if (__now_count_ns > numeric_limits<__ns_rep>::max() - __d_ns_count) {
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__do_timed_wait(__lk, __clock_tp_ns::max());
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} else {
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__do_timed_wait(__lk, __clock_tp_ns(nanoseconds(__now_count_ns + __d_ns_count)));
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}
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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
|