2018-07-25 12:40:12 +02:00
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// std::unique_lock implementation -*- C++ -*-
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2019-01-01 13:31:55 +01:00
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// Copyright (C) 2008-2019 Free Software Foundation, Inc.
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2018-07-25 12:40:12 +02:00
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/unique_lock.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{mutex}
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*/
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#ifndef _GLIBCXX_UNIQUE_LOCK_H
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#define _GLIBCXX_UNIQUE_LOCK_H 1
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#pragma GCC system_header
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <chrono>
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#include <bits/move.h> // for std::swap
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/** @brief A movable scoped lock type.
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*
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* A unique_lock controls mutex ownership within a scope. Ownership of the
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* mutex can be delayed until after construction and can be transferred
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* to another unique_lock by move construction or move assignment. If a
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* mutex lock is owned when the destructor runs ownership will be released.
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2019-05-02 17:46:42 +02:00
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*
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* @ingroup mutexes
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2018-07-25 12:40:12 +02:00
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*/
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template<typename _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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: _M_device(0), _M_owns(false)
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{ }
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explicit unique_lock(mutex_type& __m)
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: _M_device(std::__addressof(__m)), _M_owns(false)
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{
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lock();
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_M_owns = true;
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}
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unique_lock(mutex_type& __m, defer_lock_t) noexcept
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: _M_device(std::__addressof(__m)), _M_owns(false)
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{ }
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unique_lock(mutex_type& __m, try_to_lock_t)
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: _M_device(std::__addressof(__m)), _M_owns(_M_device->try_lock())
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{ }
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unique_lock(mutex_type& __m, adopt_lock_t) noexcept
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: _M_device(std::__addressof(__m)), _M_owns(true)
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{
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// XXX calling thread owns mutex
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}
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template<typename _Clock, typename _Duration>
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unique_lock(mutex_type& __m,
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const chrono::time_point<_Clock, _Duration>& __atime)
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: _M_device(std::__addressof(__m)),
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_M_owns(_M_device->try_lock_until(__atime))
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{ }
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template<typename _Rep, typename _Period>
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unique_lock(mutex_type& __m,
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const chrono::duration<_Rep, _Period>& __rtime)
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: _M_device(std::__addressof(__m)),
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_M_owns(_M_device->try_lock_for(__rtime))
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{ }
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~unique_lock()
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{
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if (_M_owns)
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unlock();
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}
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unique_lock(const unique_lock&) = delete;
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unique_lock& operator=(const unique_lock&) = delete;
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unique_lock(unique_lock&& __u) noexcept
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: _M_device(__u._M_device), _M_owns(__u._M_owns)
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{
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__u._M_device = 0;
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__u._M_owns = false;
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}
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unique_lock& operator=(unique_lock&& __u) noexcept
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{
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if(_M_owns)
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unlock();
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unique_lock(std::move(__u)).swap(*this);
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__u._M_device = 0;
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__u._M_owns = false;
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return *this;
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}
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void
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lock()
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{
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if (!_M_device)
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__throw_system_error(int(errc::operation_not_permitted));
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else if (_M_owns)
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__throw_system_error(int(errc::resource_deadlock_would_occur));
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else
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{
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_M_device->lock();
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_M_owns = true;
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}
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}
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bool
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try_lock()
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{
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if (!_M_device)
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__throw_system_error(int(errc::operation_not_permitted));
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else if (_M_owns)
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__throw_system_error(int(errc::resource_deadlock_would_occur));
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else
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{
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_M_owns = _M_device->try_lock();
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return _M_owns;
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}
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}
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template<typename _Clock, typename _Duration>
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bool
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try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)
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{
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if (!_M_device)
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__throw_system_error(int(errc::operation_not_permitted));
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else if (_M_owns)
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__throw_system_error(int(errc::resource_deadlock_would_occur));
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else
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{
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_M_owns = _M_device->try_lock_until(__atime);
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return _M_owns;
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}
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}
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template<typename _Rep, typename _Period>
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bool
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try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)
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{
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if (!_M_device)
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__throw_system_error(int(errc::operation_not_permitted));
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else if (_M_owns)
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__throw_system_error(int(errc::resource_deadlock_would_occur));
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else
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{
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_M_owns = _M_device->try_lock_for(__rtime);
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return _M_owns;
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}
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}
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void
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unlock()
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{
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if (!_M_owns)
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__throw_system_error(int(errc::operation_not_permitted));
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else if (_M_device)
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{
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_M_device->unlock();
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_M_owns = false;
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}
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}
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void
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swap(unique_lock& __u) noexcept
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{
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std::swap(_M_device, __u._M_device);
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std::swap(_M_owns, __u._M_owns);
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}
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mutex_type*
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release() noexcept
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{
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mutex_type* __ret = _M_device;
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_M_device = 0;
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_M_owns = false;
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return __ret;
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}
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bool
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owns_lock() const noexcept
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{ return _M_owns; }
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explicit operator bool() const noexcept
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{ return owns_lock(); }
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mutex_type*
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mutex() const noexcept
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{ return _M_device; }
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private:
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mutex_type* _M_device;
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bool _M_owns;
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};
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/// Swap overload for unique_lock objects.
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2019-05-02 17:46:42 +02:00
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/// @relates unique_lock
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2018-07-25 12:40:12 +02:00
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template<typename _Mutex>
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inline 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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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // C++11
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#endif // _GLIBCXX_UNIQUE_LOCK_H
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