forked from OSchip/llvm-project
583 lines
14 KiB
C++
583 lines
14 KiB
C++
// -*- C++ -*-
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//===--------------------------- mutex ------------------------------------===//
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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
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#define _LIBCPP_MUTEX
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/*
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mutex synopsis
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namespace std
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{
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class mutex
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{
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public:
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constexpr mutex() noexcept;
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~mutex();
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mutex(const mutex&) = delete;
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mutex& operator=(const mutex&) = delete;
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void lock();
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bool try_lock();
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void unlock();
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typedef pthread_mutex_t* native_handle_type;
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native_handle_type native_handle();
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};
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class recursive_mutex
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{
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public:
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recursive_mutex();
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~recursive_mutex();
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recursive_mutex(const recursive_mutex&) = delete;
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recursive_mutex& operator=(const recursive_mutex&) = delete;
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void lock();
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bool try_lock() noexcept;
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void unlock();
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typedef pthread_mutex_t* native_handle_type;
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native_handle_type native_handle();
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};
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class timed_mutex
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{
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public:
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timed_mutex();
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~timed_mutex();
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timed_mutex(const timed_mutex&) = delete;
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timed_mutex& operator=(const timed_mutex&) = delete;
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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>& rel_time);
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template <class Clock, class Duration>
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bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
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void unlock();
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};
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class recursive_timed_mutex
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{
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public:
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recursive_timed_mutex();
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~recursive_timed_mutex();
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recursive_timed_mutex(const recursive_timed_mutex&) = delete;
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recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;
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void lock();
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bool try_lock() noexcept;
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template <class Rep, class Period>
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bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
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template <class Clock, class Duration>
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bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
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void unlock();
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};
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struct defer_lock_t {};
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struct try_to_lock_t {};
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struct adopt_lock_t {};
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constexpr defer_lock_t defer_lock{};
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constexpr try_to_lock_t try_to_lock{};
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constexpr adopt_lock_t adopt_lock{};
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template <class Mutex>
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class lock_guard
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{
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public:
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typedef Mutex mutex_type;
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explicit lock_guard(mutex_type& m);
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lock_guard(mutex_type& m, adopt_lock_t);
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~lock_guard();
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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 unique_lock
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{
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public:
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typedef Mutex mutex_type;
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unique_lock() noexcept;
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explicit unique_lock(mutex_type& m);
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unique_lock(mutex_type& m, defer_lock_t) noexcept;
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unique_lock(mutex_type& m, try_to_lock_t);
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unique_lock(mutex_type& m, adopt_lock_t);
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template <class Clock, class Duration>
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unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
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template <class Rep, class Period>
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unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
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~unique_lock();
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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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unique_lock(unique_lock&& u) noexcept;
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unique_lock& operator=(unique_lock&& u) noexcept;
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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>& rel_time);
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template <class Clock, class Duration>
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bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
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void unlock();
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void swap(unique_lock& u) noexcept;
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mutex_type* release() noexcept;
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bool owns_lock() const noexcept;
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explicit operator bool () const noexcept;
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mutex_type* mutex() const noexcept;
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};
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template <class Mutex>
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void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y) noexcept;
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template <class L1, class L2, class... L3>
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int try_lock(L1&, L2&, L3&...);
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template <class L1, class L2, class... L3>
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void lock(L1&, L2&, L3&...);
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struct once_flag
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{
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constexpr once_flag() noexcept;
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once_flag(const once_flag&) = delete;
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once_flag& operator=(const once_flag&) = delete;
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};
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template<class Callable, class ...Args>
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void call_once(once_flag& flag, Callable&& func, Args&&... args);
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} // std
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*/
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#include <__config>
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#include <__mutex_base>
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#include <functional>
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#include <memory>
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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#include <tuple>
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#endif
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#include <__threading_support>
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#include <__undef_min_max>
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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_BEGIN_NAMESPACE_STD
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#ifndef _LIBCPP_HAS_NO_THREADS
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class _LIBCPP_TYPE_VIS recursive_mutex
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{
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__libcpp_mutex_t __m_;
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public:
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recursive_mutex();
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~recursive_mutex();
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private:
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recursive_mutex(const recursive_mutex&); // = delete;
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recursive_mutex& operator=(const recursive_mutex&); // = delete;
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public:
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void lock();
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bool try_lock() _NOEXCEPT;
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void unlock() _NOEXCEPT;
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typedef __libcpp_mutex_t* native_handle_type;
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_LIBCPP_INLINE_VISIBILITY
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native_handle_type native_handle() {return &__m_;}
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};
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class _LIBCPP_TYPE_VIS timed_mutex
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{
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mutex __m_;
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condition_variable __cv_;
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bool __locked_;
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public:
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timed_mutex();
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~timed_mutex();
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private:
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timed_mutex(const timed_mutex&); // = delete;
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timed_mutex& operator=(const timed_mutex&); // = delete;
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public:
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void lock();
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bool try_lock() _NOEXCEPT;
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template <class _Rep, class _Period>
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_LIBCPP_INLINE_VISIBILITY
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bool try_lock_for(const chrono::duration<_Rep, _Period>& __d)
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{return try_lock_until(chrono::steady_clock::now() + __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() _NOEXCEPT;
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};
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template <class _Clock, class _Duration>
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bool
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timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
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{
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using namespace chrono;
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unique_lock<mutex> __lk(__m_);
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bool no_timeout = _Clock::now() < __t;
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while (no_timeout && __locked_)
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no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout;
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if (!__locked_)
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{
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__locked_ = true;
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return true;
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}
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return false;
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}
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class _LIBCPP_TYPE_VIS recursive_timed_mutex
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{
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mutex __m_;
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condition_variable __cv_;
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size_t __count_;
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__libcpp_thread_id __id_;
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public:
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recursive_timed_mutex();
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~recursive_timed_mutex();
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private:
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recursive_timed_mutex(const recursive_timed_mutex&); // = delete;
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recursive_timed_mutex& operator=(const recursive_timed_mutex&); // = delete;
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public:
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void lock();
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bool try_lock() _NOEXCEPT;
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template <class _Rep, class _Period>
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_LIBCPP_INLINE_VISIBILITY
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bool try_lock_for(const chrono::duration<_Rep, _Period>& __d)
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{return try_lock_until(chrono::steady_clock::now() + __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() _NOEXCEPT;
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};
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template <class _Clock, class _Duration>
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bool
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recursive_timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
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{
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using namespace chrono;
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__libcpp_thread_id __id = __libcpp_thread_get_current_id();
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unique_lock<mutex> lk(__m_);
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if (__libcpp_thread_id_equal(__id, __id_))
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{
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if (__count_ == numeric_limits<size_t>::max())
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return false;
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++__count_;
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return true;
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}
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bool no_timeout = _Clock::now() < __t;
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while (no_timeout && __count_ != 0)
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no_timeout = __cv_.wait_until(lk, __t) == cv_status::no_timeout;
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if (__count_ == 0)
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{
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__count_ = 1;
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__id_ = __id;
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return true;
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}
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return false;
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}
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template <class _L0, class _L1>
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int
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try_lock(_L0& __l0, _L1& __l1)
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{
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unique_lock<_L0> __u0(__l0, try_to_lock);
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if (__u0.owns_lock())
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{
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if (__l1.try_lock())
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{
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__u0.release();
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return -1;
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}
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else
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return 1;
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}
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return 0;
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}
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template <class _L0, class _L1, class _L2, class... _L3>
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int
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try_lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3&... __l3)
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{
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int __r = 0;
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unique_lock<_L0> __u0(__l0, try_to_lock);
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if (__u0.owns_lock())
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{
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__r = try_lock(__l1, __l2, __l3...);
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if (__r == -1)
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__u0.release();
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else
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++__r;
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}
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return __r;
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}
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#endif // _LIBCPP_HAS_NO_VARIADICS
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template <class _L0, class _L1>
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void
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lock(_L0& __l0, _L1& __l1)
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{
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while (true)
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{
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{
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unique_lock<_L0> __u0(__l0);
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if (__l1.try_lock())
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{
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__u0.release();
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break;
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}
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}
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__libcpp_thread_yield();
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{
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unique_lock<_L1> __u1(__l1);
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if (__l0.try_lock())
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{
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__u1.release();
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break;
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}
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}
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__libcpp_thread_yield();
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}
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}
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template <class _L0, class _L1, class _L2, class ..._L3>
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void
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__lock_first(int __i, _L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3)
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{
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while (true)
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{
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switch (__i)
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{
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case 0:
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{
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unique_lock<_L0> __u0(__l0);
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__i = try_lock(__l1, __l2, __l3...);
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if (__i == -1)
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{
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__u0.release();
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return;
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}
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}
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++__i;
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__libcpp_thread_yield();
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break;
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case 1:
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{
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unique_lock<_L1> __u1(__l1);
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__i = try_lock(__l2, __l3..., __l0);
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if (__i == -1)
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{
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__u1.release();
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return;
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}
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}
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if (__i == sizeof...(_L3) + 1)
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__i = 0;
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else
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__i += 2;
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__libcpp_thread_yield();
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break;
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default:
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__lock_first(__i - 2, __l2, __l3..., __l0, __l1);
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return;
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}
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}
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}
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template <class _L0, class _L1, class _L2, class ..._L3>
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inline _LIBCPP_INLINE_VISIBILITY
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void
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lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3)
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{
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__lock_first(0, __l0, __l1, __l2, __l3...);
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}
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#endif // _LIBCPP_HAS_NO_VARIADICS
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#endif // !_LIBCPP_HAS_NO_THREADS
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struct _LIBCPP_TYPE_VIS_ONLY once_flag;
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template<class _Callable, class... _Args>
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_LIBCPP_INLINE_VISIBILITY
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void call_once(once_flag&, _Callable&&, _Args&&...);
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#else // _LIBCPP_HAS_NO_VARIADICS
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template<class _Callable>
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_LIBCPP_INLINE_VISIBILITY
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void call_once(once_flag&, _Callable&);
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template<class _Callable>
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_LIBCPP_INLINE_VISIBILITY
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void call_once(once_flag&, const _Callable&);
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#endif // _LIBCPP_HAS_NO_VARIADICS
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struct _LIBCPP_TYPE_VIS_ONLY once_flag
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{
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR
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once_flag() _NOEXCEPT : __state_(0) {}
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private:
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once_flag(const once_flag&); // = delete;
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once_flag& operator=(const once_flag&); // = delete;
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|
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unsigned long __state_;
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|
|
#ifndef _LIBCPP_HAS_NO_VARIADICS
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template<class _Callable, class... _Args>
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friend
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void call_once(once_flag&, _Callable&&, _Args&&...);
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|
#else // _LIBCPP_HAS_NO_VARIADICS
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|
template<class _Callable>
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|
friend
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|
void call_once(once_flag&, _Callable&);
|
|
|
|
template<class _Callable>
|
|
friend
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|
void call_once(once_flag&, const _Callable&);
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|
#endif // _LIBCPP_HAS_NO_VARIADICS
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};
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|
|
|
#ifndef _LIBCPP_HAS_NO_VARIADICS
|
|
|
|
template <class _Fp>
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|
class __call_once_param
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|
{
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|
_Fp& __f_;
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|
public:
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_LIBCPP_INLINE_VISIBILITY
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explicit __call_once_param(_Fp& __f) : __f_(__f) {}
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|
|
_LIBCPP_INLINE_VISIBILITY
|
|
void operator()()
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|
{
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|
typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 1>::type _Index;
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__execute(_Index());
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|
}
|
|
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|
private:
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|
template <size_t ..._Indices>
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|
_LIBCPP_INLINE_VISIBILITY
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|
void __execute(__tuple_indices<_Indices...>)
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|
{
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|
__invoke(_VSTD::get<0>(_VSTD::move(__f_)), _VSTD::get<_Indices>(_VSTD::move(__f_))...);
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|
}
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|
};
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|
|
#else
|
|
|
|
template <class _Fp>
|
|
class __call_once_param
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|
{
|
|
_Fp& __f_;
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|
public:
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
explicit __call_once_param(_Fp& __f) : __f_(__f) {}
|
|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
void operator()()
|
|
{
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|
__f_();
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|
}
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|
};
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|
|
#endif
|
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|
|
template <class _Fp>
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|
void
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__call_once_proxy(void* __vp)
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|
{
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|
__call_once_param<_Fp>* __p = static_cast<__call_once_param<_Fp>*>(__vp);
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(*__p)();
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}
|
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|
|
_LIBCPP_FUNC_VIS void __call_once(volatile unsigned long&, void*, void(*)(void*));
|
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|
|
#ifndef _LIBCPP_HAS_NO_VARIADICS
|
|
|
|
template<class _Callable, class... _Args>
|
|
inline _LIBCPP_INLINE_VISIBILITY
|
|
void
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call_once(once_flag& __flag, _Callable&& __func, _Args&&... __args)
|
|
{
|
|
if (__libcpp_relaxed_load(&__flag.__state_) != ~0ul)
|
|
{
|
|
typedef tuple<_Callable&&, _Args&&...> _Gp;
|
|
_Gp __f(_VSTD::forward<_Callable>(__func), _VSTD::forward<_Args>(__args)...);
|
|
__call_once_param<_Gp> __p(__f);
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|
__call_once(__flag.__state_, &__p, &__call_once_proxy<_Gp>);
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|
}
|
|
}
|
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|
|
#else // _LIBCPP_HAS_NO_VARIADICS
|
|
|
|
template<class _Callable>
|
|
inline _LIBCPP_INLINE_VISIBILITY
|
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void
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call_once(once_flag& __flag, _Callable& __func)
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{
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if (__libcpp_relaxed_load(&__flag.__state_) != ~0ul)
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{
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__call_once_param<_Callable> __p(__func);
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__call_once(__flag.__state_, &__p, &__call_once_proxy<_Callable>);
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}
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}
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template<class _Callable>
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inline _LIBCPP_INLINE_VISIBILITY
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|
void
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|
call_once(once_flag& __flag, const _Callable& __func)
|
|
{
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|
if (__flag.__state_ != ~0ul)
|
|
{
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|
__call_once_param<const _Callable> __p(__func);
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|
__call_once(__flag.__state_, &__p, &__call_once_proxy<const _Callable>);
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|
}
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|
}
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|
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#endif // _LIBCPP_HAS_NO_VARIADICS
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_LIBCPP_END_NAMESPACE_STD
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|
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#endif // _LIBCPP_MUTEX
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