release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/include/c++/4.5.3/condition_variable

   1 // <condition_variable> -*- C++ -*-
   2
   3 // Copyright (C) 2008, 2009, 2010 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.
  10
  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.
  15
  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.
  19
  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/>.
  24
  25 /** @file condition_variable
  26  *  This is a Standard C++ Library header.
  27  */
  28
  29 #ifndef _GLIBCXX_CONDITION_VARIABLE
  30 #define _GLIBCXX_CONDITION_VARIABLE 1
  31
  32 #pragma GCC system_header
  33
  34 #ifndef __GXX_EXPERIMENTAL_CXX0X__
  35 # include <bits/c++0x_warning.h>
  36 #else
  37
  38 #include <chrono>
  39 #include <mutex> // unique_lock
  40
  41 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  42
  43 namespace std
  44 {
  45   /**
  46    * @defgroup condition_variables Condition Variables
  47    * @ingroup concurrency
  48    *
  49    * Classes for condition_variable support.
  50    * @{
  51    */
  52
  53   /// cv_status
  54   enum class cv_status { no_timeout, timeout };
  55
  56   /// condition_variable
  57   class condition_variable
  58   {
  59     typedef chrono::system_clock        __clock_t;
  60     typedef __gthread_cond_t            __native_type;
  61     __native_type                       _M_cond;
  62
  63   public:
  64     typedef __native_type*              native_handle_type;
  65
  66     condition_variable() throw ();
  67     ~condition_variable() throw ();
  68
  69     condition_variable(const condition_variable&) = delete;
  70     condition_variable& operator=(const condition_variable&) = delete;
  71
  72     void
  73     notify_one();
  74
  75     void
  76     notify_all();
  77
  78     void
  79     wait(unique_lock<mutex>& __lock);
  80
  81     template<typename _Predicate>
  82       void
  83       wait(unique_lock<mutex>& __lock, _Predicate __p)
  84       {
  85         while (!__p())
  86           wait(__lock);
  87       }
  88
  89     template<typename _Duration>
  90       cv_status
  91       wait_until(unique_lock<mutex>& __lock,
  92                  const chrono::time_point<__clock_t, _Duration>& __atime)
  93       { return __wait_until_impl(__lock, __atime); }
  94
  95     template<typename _Clock, typename _Duration>
  96       cv_status
  97       wait_until(unique_lock<mutex>& __lock,
  98                  const chrono::time_point<_Clock, _Duration>& __atime)
  99       {
 100         // DR 887 - Sync unknown clock to known clock.
 101         const typename _Clock::time_point __c_entry = _Clock::now();
 102         const __clock_t::time_point __s_entry = __clock_t::now();
 103         const chrono::nanoseconds __delta = __atime - __c_entry;
 104         const __clock_t::time_point __s_atime = __s_entry + __delta;
 105
 106         return __wait_until_impl(__lock, __s_atime);
 107       }
 108
 109     template<typename _Clock, typename _Duration, typename _Predicate>
 110       bool
 111       wait_until(unique_lock<mutex>& __lock,
 112                  const chrono::time_point<_Clock, _Duration>& __atime,
 113                  _Predicate __p)
 114       {
 115         while (!__p())
 116           if (wait_until(__lock, __atime) == cv_status::timeout)
 117             return __p();
 118         return true;
 119       }
 120
 121     template<typename _Rep, typename _Period>
 122       cv_status
 123       wait_for(unique_lock<mutex>& __lock,
 124                const chrono::duration<_Rep, _Period>& __rtime)
 125       { return wait_until(__lock, __clock_t::now() + __rtime); }
 126
 127     template<typename _Rep, typename _Period, typename _Predicate>
 128       bool
 129       wait_for(unique_lock<mutex>& __lock,
 130                const chrono::duration<_Rep, _Period>& __rtime,
 131                _Predicate __p)
 132       { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }
 133
 134     native_handle_type
 135     native_handle()
 136     { return &_M_cond; }
 137
 138   private:
 139     template<typename _Clock, typename _Duration>
 140       cv_status
 141       __wait_until_impl(unique_lock<mutex>& __lock,
 142                         const chrono::time_point<_Clock, _Duration>& __atime)
 143       {
 144         chrono::time_point<__clock_t, chrono::seconds> __s =
 145           chrono::time_point_cast<chrono::seconds>(__atime);
 146
 147         chrono::nanoseconds __ns =
 148           chrono::duration_cast<chrono::nanoseconds>(__atime - __s);
 149
 150         __gthread_time_t __ts =
 151           {
 152             static_cast<std::time_t>(__s.time_since_epoch().count()),
 153             static_cast<long>(__ns.count())
 154           };
 155
 156         __gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(),
 157                                  &__ts);
 158
 159         return (_Clock::now() < __atime
 160                 ? cv_status::no_timeout : cv_status::timeout);
 161       }
 162   };
 163
 164   /// condition_variable_any
 165   // Like above, but mutex is not required to have try_lock.
 166   class condition_variable_any
 167   {
 168     typedef chrono::system_clock        __clock_t;
 169     condition_variable                  _M_cond;
 170     mutex                               _M_mutex;
 171
 172   public:
 173     typedef condition_variable::native_handle_type      native_handle_type;
 174
 175     condition_variable_any() throw ();
 176     ~condition_variable_any() throw ();
 177
 178     condition_variable_any(const condition_variable_any&) = delete;
 179     condition_variable_any& operator=(const condition_variable_any&) = delete;
 180
 181     void
 182     notify_one()
 183     {
 184       lock_guard<mutex> __lock(_M_mutex);
 185       _M_cond.notify_one();
 186     }
 187
 188     void
 189     notify_all()
 190     {
 191       lock_guard<mutex> __lock(_M_mutex);
 192       _M_cond.notify_all();
 193     }
 194
 195     template<typename _Lock>
 196       void
 197       wait(_Lock& __lock)
 198       {
 199         unique_lock<mutex> __my_lock(_M_mutex);
 200         __lock.unlock();
 201         _M_cond.wait(__my_lock);
 202         __lock.lock();
 203       }
 204
 205
 206     template<typename _Lock, typename _Predicate>
 207       void
 208       wait(_Lock& __lock, _Predicate __p)
 209       {
 210         while (!__p())
 211           wait(__lock);
 212       }
 213
 214     template<typename _Lock, typename _Clock, typename _Duration>
 215       cv_status
 216       wait_until(_Lock& __lock,
 217                  const chrono::time_point<_Clock, _Duration>& __atime)
 218       {
 219         unique_lock<mutex> __my_lock(_M_mutex);
 220         __lock.unlock();
 221         cv_status __status = _M_cond.wait_until(__my_lock, __atime);
 222         __lock.lock();
 223         return __status;
 224       }
 225
 226     template<typename _Lock, typename _Clock,
 227              typename _Duration, typename _Predicate>
 228       bool
 229       wait_until(_Lock& __lock,
 230                  const chrono::time_point<_Clock, _Duration>& __atime,
 231                  _Predicate __p)
 232       {
 233         while (!__p())
 234           if (wait_until(__lock, __atime) == cv_status::timeout)
 235             return __p();
 236         return true;
 237       }
 238
 239     template<typename _Lock, typename _Rep, typename _Period>
 240       cv_status
 241       wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __rtime)
 242       { return wait_until(__lock, __clock_t::now() + __rtime); }
 243
 244     template<typename _Lock, typename _Rep,
 245              typename _Period, typename _Predicate>
 246       bool
 247       wait_for(_Lock& __lock,
 248                const chrono::duration<_Rep, _Period>& __rtime, _Predicate __p)
 249       { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); }
 250
 251     native_handle_type
 252     native_handle()
 253     { return _M_cond.native_handle(); }
 254   };
 255
 256   // @} group condition_variables
 257 }
 258
 259 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
 260
 261 #endif // __GXX_EXPERIMENTAL_CXX0X__
 262
 263 #endif // _GLIBCXX_CONDITION_VARIABLE