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1 // <condition_variable> -*- C++ -*-
3 // Copyright (C) 2008, 2009 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library.  This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23 // <http://www.gnu.org/licenses/>.
25 /** @file condition_variable
26  *  This is a Standard C++ Library header.
27  */
29 #ifndef _GLIBCXX_CONDITION_VARIABLE
30 #define _GLIBCXX_CONDITION_VARIABLE 1
32 #pragma GCC system_header
34 #ifndef __GXX_EXPERIMENTAL_CXX0X__
35 # include <c++0x_warning.h>
36 #else
38 #include <chrono>
39 #include <mutex> // unique_lock
41 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
43 namespace std
45   /**
46    * @defgroup condition_variables Condition Variables
47    * @ingroup concurrency
48    *
49    * Classes for condition_variable support.
50    * @{
51    */
53   /// condition_variable
54   class condition_variable
55   {
56     typedef chrono::system_clock        __clock_t;
57     typedef __gthread_cond_t            __native_type;
58     __native_type                       _M_cond;
60   public:
61     typedef __native_type*              native_handle_type;
63     condition_variable();
64     ~condition_variable();
66     condition_variable(const condition_variable&) = delete;
67     condition_variable& operator=(const condition_variable&) = delete;
69     void
70     notify_one();
72     void
73     notify_all();
75     void
76     wait(unique_lock<mutex>& __lock);
78     template<typename _Predicate>
79       void
80       wait(unique_lock<mutex>& __lock, _Predicate __p)
81       {
82         while (!__p())
83           wait(__lock);
84       }
86     template<typename _Duration>
87       bool
88       wait_until(unique_lock<mutex>& __lock,
89                  const chrono::time_point<__clock_t, _Duration>& __atime)
90       { return __wait_until_impl(__lock, __atime); }
92     template<typename _Clock, typename _Duration>
93       bool
94       wait_until(unique_lock<mutex>& __lock,
95                  const chrono::time_point<_Clock, _Duration>& __atime)
96       {
97         // DR 887 - Sync unknown clock to known clock.
98         typename _Clock::time_point __c_entry = _Clock::now();
99         __clock_t::time_point __s_entry = __clock_t::now();
100         chrono::nanoseconds __delta = __atime - __c_entry;
101         __clock_t::time_point __s_atime = __s_entry + __delta;
103         return __wait_until_impl(__lock, __s_atime);
104       }
106     template<typename _Clock, typename _Duration, typename _Predicate>
107       bool
108       wait_until(unique_lock<mutex>& __lock,
109                  const chrono::time_point<_Clock, _Duration>& __atime,
110                  _Predicate __p)
111       {
112         while (!__p())
113           if (!wait_until(__lock, __atime))
114             return __p();
116         return true;
117       }
119     template<typename _Rep, typename _Period>
120       bool
121       wait_for(unique_lock<mutex>& __lock,
122                const chrono::duration<_Rep, _Period>& __rtime)
123       { return wait_until(__lock, __clock_t::now() + __rtime); }
125     template<typename _Rep, typename _Period, typename _Predicate>
126       bool
127       wait_for(unique_lock<mutex>& __lock,
128                const chrono::duration<_Rep, _Period>& __rtime,
129                _Predicate __p)
130       { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }
132     native_handle_type
133     native_handle()
134     { return &_M_cond; }
136   private:
137     template<typename _Clock, typename _Duration>
138       bool
139       __wait_until_impl(unique_lock<mutex>& __lock,
140                         const chrono::time_point<_Clock, _Duration>& __atime)
141       {
142         chrono::time_point<__clock_t, chrono::seconds> __s =
143           chrono::time_point_cast<chrono::seconds>(__atime);
145         chrono::nanoseconds __ns =
146           chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
148         __gthread_time_t __ts =
149           {
150             static_cast<std::time_t>(__s.time_since_epoch().count()),
151             static_cast<long>(__ns.count())
152           };
154         __gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(),
155                                  &__ts);
157         return _Clock::now() < __atime;
158       }
159   };
161   /// condition_variable_any
162   // Like above, only mutex may not have try_lock.
163   class condition_variable_any
164   {
165     typedef __gthread_cond_t            __native_type;
166     __native_type                       _M_cond;
168   public:
169     typedef __native_type*              native_handle_type;
171     condition_variable_any();
172     ~condition_variable_any();
174     condition_variable_any(const condition_variable_any&) = delete;
175     condition_variable_any& operator=(const condition_variable_any&) = delete;
177     void
178     notify_one();
180     void
181     notify_all();
183     template<typename _Lock>
184       void
185       wait(_Lock& __lock);
187     template<typename _Lock, typename _Predicate>
188       void
189       wait(_Lock& __lock, _Predicate __p);
191     template<typename _Lock, typename _Clock, typename _Duration>
192       bool
193       wait_until(_Lock& __lock,
194                  const chrono::time_point<_Clock, _Duration>& __atime);
196     template<typename _Lock, typename _Clock,
197              typename _Duration, typename _Predicate>
198       bool
199       wait_until(_Lock& __lock,
200                  const chrono::time_point<_Clock, _Duration>& __atime,
201                  _Predicate __p);
203     template<typename _Lock, typename _Rep, typename _Period>
204       bool
205       wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __rtime);
207     template<typename _Lock, typename _Rep,
208              typename _Period, typename _Predicate>
209       bool
210       wait_for(_Lock& __lock,
211                const chrono::duration<_Rep, _Period>& __rtime, _Predicate __p);
213     native_handle_type
214     native_handle()
215     { return &_M_cond; }
216   };
218   // @} group condition_variables
221 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
223 #endif // __GXX_EXPERIMENTAL_CXX0X__
225 #endif // _GLIBCXX_CONDITION_VARIABLE