222 lines
6.3 KiB
C++
222 lines
6.3 KiB
C++
// <condition_variable> -*- C++ -*-
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// Copyright (C) 2008 Free Software Foundation, Inc.
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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 2, 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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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING. If not, write to
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// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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// Boston, MA 02110-1301, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file condition_variable
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_CONDITION_VARIABLE
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#define _GLIBCXX_CONDITION_VARIABLE 1
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#pragma GCC system_header
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#ifndef __GXX_EXPERIMENTAL_CXX0X__
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# include <c++0x_warning.h>
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#else
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#include <chrono>
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#include <mutex> // unique_lock
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#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
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namespace std
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{
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/// condition_variable
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class condition_variable
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{
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typedef chrono::system_clock __clock_t;
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public:
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typedef __gthread_cond_t* native_handle_type;
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condition_variable();
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~condition_variable();
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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
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notify_one();
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void
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notify_all();
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void
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wait(unique_lock<mutex>& __lock);
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template<typename _Predicate>
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void
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wait(unique_lock<mutex>& __lock, _Predicate __p)
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{
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while (!__p())
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wait(__lock);
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}
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template<typename _Duration>
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bool
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wait_until(unique_lock<mutex>& __lock,
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const chrono::time_point<__clock_t, _Duration>& __atime)
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{ return __wait_until_impl(__lock, __atime); }
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template<typename _Clock, typename _Duration>
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bool
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wait_until(unique_lock<mutex>& __lock,
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const chrono::time_point<_Clock, _Duration>& __atime)
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{
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// DR 887 - Sync unknown clock to known clock.
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typename _Clock::time_point __c_entry = _Clock::now();
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__clock_t::time_point __s_entry = __clock_t::now();
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chrono::nanoseconds __delta = __atime - __c_entry;
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__clock_t::time_point __s_atime = __s_entry + __delta;
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return __wait_until_impl(__lock, __s_atime);
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}
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template<typename _Clock, typename _Duration, typename _Predicate>
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bool
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wait_until(unique_lock<mutex>& __lock,
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const chrono::time_point<_Clock, _Duration>& __atime,
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_Predicate __p)
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{
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while(!__p())
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if(!wait_until(__lock, __atime))
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return __p();
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return true;
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}
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template<typename _Rep, typename _Period>
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bool
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wait_for(unique_lock<mutex>& __lock,
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const chrono::duration<_Rep, _Period>& __rtime)
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{ return wait_until(__lock, __clock_t::now() + __rtime); }
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template<typename _Rep, typename _Period, typename _Predicate>
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bool
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wait_for(unique_lock<mutex>& __lock,
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const chrono::duration<_Rep, _Period>& __rtime,
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_Predicate __p)
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{ return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }
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native_handle_type
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native_handle()
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{ return &_M_cond; }
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private:
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__gthread_cond_t _M_cond;
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mutex _M_internal_mutex;
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template<typename _Clock, typename _Duration>
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bool
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__wait_until_impl(unique_lock<mutex>& __lock,
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const chrono::time_point<_Clock, _Duration>& __atime)
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{
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chrono::time_point<__clock_t, chrono::seconds> __s =
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chrono::time_point_cast<chrono::seconds>(__atime);
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chrono::nanoseconds __ns =
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chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
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__gthread_time_t __ts =
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{
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static_cast<std::time_t>(__s.time_since_epoch().count()),
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static_cast<long>(__ns.count())
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};
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__gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(),
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&__ts);
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return _Clock::now() < __atime;
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}
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};
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/// condition_variable_any
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// Like above, only mutex may not have try_lock.
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class condition_variable_any
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{
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public:
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typedef __gthread_cond_t* native_handle_type;
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condition_variable_any();
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~condition_variable_any();
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condition_variable_any(const condition_variable_any&) = delete;
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condition_variable_any& operator=(const condition_variable_any&) = delete;
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void
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notify_one();
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void
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notify_all();
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template<typename _Lock>
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void
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wait(_Lock& __lock);
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template<typename _Lock, typename _Predicate>
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void
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wait(_Lock& __lock, _Predicate __p);
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template<typename _Lock, typename _Clock, typename _Duration>
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bool
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wait_until(_Lock& __lock,
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const chrono::time_point<_Clock, _Duration>& __atime);
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template<typename _Lock, typename _Clock,
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typename _Duration, typename _Predicate>
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bool
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wait_until(_Lock& __lock,
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const chrono::time_point<_Clock, _Duration>& __atime,
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_Predicate __p);
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template<typename _Lock, typename _Rep, typename _Period>
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bool
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wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __rtime);
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template<typename _Lock, typename _Rep,
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typename _Period, typename _Predicate>
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bool
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wait_for(_Lock& __lock,
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const chrono::duration<_Rep, _Period>& __rtime, _Predicate __p);
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native_handle_type
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native_handle()
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{ return &_M_cond; }
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private:
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__gthread_cond_t _M_cond;
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};
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}
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#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
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#endif // __GXX_EXPERIMENTAL_CXX0X__
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#endif // _GLIBCXX_CONDITION_VARIABLE
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