441 lines
13 KiB
C++
441 lines
13 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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 <__config>
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#include <chrono>
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#include <system_error>
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#include <__threading_support>
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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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#ifndef _LIBCPP_THREAD_SAFETY_ANNOTATION
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# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
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# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x))
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# else
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# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x)
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# endif
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#endif // _LIBCPP_THREAD_SAFETY_ANNOTATION
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class _LIBCPP_TYPE_VIS _LIBCPP_THREAD_SAFETY_ANNOTATION(capability("mutex")) mutex
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{
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#ifndef _LIBCPP_CXX03_LANG
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__libcpp_mutex_t __m_ = _LIBCPP_MUTEX_INITIALIZER;
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#else
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__libcpp_mutex_t __m_;
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#endif
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public:
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_LIBCPP_INLINE_VISIBILITY
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#ifndef _LIBCPP_CXX03_LANG
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constexpr mutex() = default;
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#else
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mutex() _NOEXCEPT {__m_ = (__libcpp_mutex_t)_LIBCPP_MUTEX_INITIALIZER;}
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#endif
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~mutex();
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private:
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mutex(const mutex&);// = delete;
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mutex& operator=(const mutex&);// = delete;
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public:
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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 {};
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struct _LIBCPP_TYPE_VIS try_to_lock_t {};
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struct _LIBCPP_TYPE_VIS adopt_lock_t {};
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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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/* _LIBCPP_INLINE_VAR */ constexpr defer_lock_t defer_lock = defer_lock_t();
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/* _LIBCPP_INLINE_VAR */ constexpr try_to_lock_t try_to_lock = try_to_lock_t();
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/* _LIBCPP_INLINE_VAR */ 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_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_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&) _LIBCPP_EQUAL_DELETE;
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lock_guard& operator=(lock_guard const&) _LIBCPP_EQUAL_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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private:
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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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public:
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#ifndef _LIBCPP_CXX03_LANG
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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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#endif // _LIBCPP_CXX03_LANG
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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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_LIBCPP_EXPLICIT
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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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#ifndef _LIBCPP_CXX03_LANG
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__libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
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#else
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__libcpp_condvar_t __cv_;
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#endif
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public:
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_LIBCPP_INLINE_VISIBILITY
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#ifndef _LIBCPP_CXX03_LANG
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constexpr condition_variable() _NOEXCEPT = default;
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#else
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condition_variable() _NOEXCEPT {__cv_ = (__libcpp_condvar_t)_LIBCPP_CONDVAR_INITIALIZER;}
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#endif
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~condition_variable();
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private:
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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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public:
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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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};
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#endif // !_LIBCPP_HAS_NO_THREADS
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template <class _To, 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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chrono::__is_duration<_To>::value,
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_To
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>::type
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__ceil(chrono::duration<_Rep, _Period> __d)
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{
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using namespace chrono;
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_To __r = duration_cast<_To>(__d);
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if (__r < __d)
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++__r;
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return __r;
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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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wait_for(__lk, __t - _Clock::now());
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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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typedef time_point<system_clock, duration<long double, nano> > __sys_tpf;
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typedef time_point<system_clock, nanoseconds> __sys_tpi;
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__sys_tpf _Max = __sys_tpi::max();
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steady_clock::time_point __c_now = steady_clock::now();
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system_clock::time_point __s_now = system_clock::now();
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if (_Max - __d > __s_now)
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__do_timed_wait(__lk, __s_now + __ceil<nanoseconds>(__d));
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else
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__do_timed_wait(__lk, __sys_tpi::max());
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return steady_clock::now() - __c_now < __d ? cv_status::no_timeout :
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cv_status::timeout;
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}
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template <class _Rep, class _Period, class _Predicate>
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inline
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bool
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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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_Predicate __pred)
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{
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return wait_until(__lk, chrono::steady_clock::now() + __d,
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_VSTD::move(__pred));
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}
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#endif // !_LIBCPP_HAS_NO_THREADS
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MUTEX_BASE
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