| // <condition_variable> -*- C++ -*- |
| |
| // Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file include/condition_variable |
| * This is a Standard C++ Library header. |
| */ |
| |
| #ifndef _GLIBCXX_CONDITION_VARIABLE |
| #define _GLIBCXX_CONDITION_VARIABLE 1 |
| |
| #pragma GCC system_header |
| |
| #ifndef __GXX_EXPERIMENTAL_CXX0X__ |
| # include <bits/c++0x_warning.h> |
| #else |
| |
| #include <chrono> |
| #include <mutex> // unique_lock |
| |
| #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| /** |
| * @defgroup condition_variables Condition Variables |
| * @ingroup concurrency |
| * |
| * Classes for condition_variable support. |
| * @{ |
| */ |
| |
| /// cv_status |
| enum class cv_status { no_timeout, timeout }; |
| |
| /// condition_variable |
| class condition_variable |
| { |
| typedef chrono::system_clock __clock_t; |
| typedef __gthread_cond_t __native_type; |
| __native_type _M_cond; |
| |
| public: |
| typedef __native_type* native_handle_type; |
| |
| condition_variable() throw (); |
| ~condition_variable() throw (); |
| |
| condition_variable(const condition_variable&) = delete; |
| condition_variable& operator=(const condition_variable&) = delete; |
| |
| void |
| notify_one(); |
| |
| void |
| notify_all(); |
| |
| void |
| wait(unique_lock<mutex>& __lock); |
| |
| template<typename _Predicate> |
| void |
| wait(unique_lock<mutex>& __lock, _Predicate __p) |
| { |
| while (!__p()) |
| wait(__lock); |
| } |
| |
| template<typename _Duration> |
| cv_status |
| wait_until(unique_lock<mutex>& __lock, |
| const chrono::time_point<__clock_t, _Duration>& __atime) |
| { return __wait_until_impl(__lock, __atime); } |
| |
| template<typename _Clock, typename _Duration> |
| cv_status |
| wait_until(unique_lock<mutex>& __lock, |
| const chrono::time_point<_Clock, _Duration>& __atime) |
| { |
| // DR 887 - Sync unknown clock to known clock. |
| const typename _Clock::time_point __c_entry = _Clock::now(); |
| const __clock_t::time_point __s_entry = __clock_t::now(); |
| const chrono::nanoseconds __delta = __atime - __c_entry; |
| const __clock_t::time_point __s_atime = __s_entry + __delta; |
| |
| return __wait_until_impl(__lock, __s_atime); |
| } |
| |
| template<typename _Clock, typename _Duration, typename _Predicate> |
| bool |
| wait_until(unique_lock<mutex>& __lock, |
| const chrono::time_point<_Clock, _Duration>& __atime, |
| _Predicate __p) |
| { |
| while (!__p()) |
| if (wait_until(__lock, __atime) == cv_status::timeout) |
| return __p(); |
| return true; |
| } |
| |
| template<typename _Rep, typename _Period> |
| cv_status |
| wait_for(unique_lock<mutex>& __lock, |
| const chrono::duration<_Rep, _Period>& __rtime) |
| { return wait_until(__lock, __clock_t::now() + __rtime); } |
| |
| template<typename _Rep, typename _Period, typename _Predicate> |
| bool |
| wait_for(unique_lock<mutex>& __lock, |
| const chrono::duration<_Rep, _Period>& __rtime, |
| _Predicate __p) |
| { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); } |
| |
| native_handle_type |
| native_handle() |
| { return &_M_cond; } |
| |
| private: |
| template<typename _Clock, typename _Duration> |
| cv_status |
| __wait_until_impl(unique_lock<mutex>& __lock, |
| const chrono::time_point<_Clock, _Duration>& __atime) |
| { |
| chrono::time_point<__clock_t, chrono::seconds> __s = |
| chrono::time_point_cast<chrono::seconds>(__atime); |
| |
| chrono::nanoseconds __ns = |
| chrono::duration_cast<chrono::nanoseconds>(__atime - __s); |
| |
| __gthread_time_t __ts = |
| { |
| static_cast<std::time_t>(__s.time_since_epoch().count()), |
| static_cast<long>(__ns.count()) |
| }; |
| |
| __gthread_cond_timedwait(&_M_cond, __lock.mutex()->native_handle(), |
| &__ts); |
| |
| return (_Clock::now() < __atime |
| ? cv_status::no_timeout : cv_status::timeout); |
| } |
| }; |
| |
| /// condition_variable_any |
| // Like above, but mutex is not required to have try_lock. |
| class condition_variable_any |
| { |
| typedef chrono::system_clock __clock_t; |
| condition_variable _M_cond; |
| mutex _M_mutex; |
| |
| // scoped unlock - unlocks in ctor, re-locks in dtor |
| template<typename _Lock> |
| struct _Unlock |
| { |
| explicit _Unlock(_Lock& __lk) : _M_lock(__lk) { __lk.unlock(); } |
| |
| ~_Unlock() noexcept(false) |
| { |
| if (uncaught_exception()) |
| __try { _M_lock.lock(); } __catch(...) { } |
| else |
| _M_lock.lock(); |
| } |
| |
| _Unlock(const _Unlock&) = delete; |
| _Unlock& operator=(const _Unlock&) = delete; |
| |
| _Lock& _M_lock; |
| }; |
| |
| public: |
| typedef condition_variable::native_handle_type native_handle_type; |
| |
| condition_variable_any() throw (); |
| ~condition_variable_any() throw (); |
| |
| condition_variable_any(const condition_variable_any&) = delete; |
| condition_variable_any& operator=(const condition_variable_any&) = delete; |
| |
| void |
| notify_one() |
| { |
| lock_guard<mutex> __lock(_M_mutex); |
| _M_cond.notify_one(); |
| } |
| |
| void |
| notify_all() |
| { |
| lock_guard<mutex> __lock(_M_mutex); |
| _M_cond.notify_all(); |
| } |
| |
| template<typename _Lock> |
| void |
| wait(_Lock& __lock) |
| { |
| unique_lock<mutex> __my_lock(_M_mutex); |
| _Unlock<_Lock> __unlock(__lock); |
| // _M_mutex must be unlocked before re-locking __lock so move |
| // ownership of _M_mutex lock to an object with shorter lifetime. |
| unique_lock<mutex> __my_lock2(std::move(__my_lock)); |
| _M_cond.wait(__my_lock2); |
| } |
| |
| |
| template<typename _Lock, typename _Predicate> |
| void |
| wait(_Lock& __lock, _Predicate __p) |
| { |
| while (!__p()) |
| wait(__lock); |
| } |
| |
| template<typename _Lock, typename _Clock, typename _Duration> |
| cv_status |
| wait_until(_Lock& __lock, |
| const chrono::time_point<_Clock, _Duration>& __atime) |
| { |
| unique_lock<mutex> __my_lock(_M_mutex); |
| _Unlock<_Lock> __unlock(__lock); |
| // _M_mutex must be unlocked before re-locking __lock so move |
| // ownership of _M_mutex lock to an object with shorter lifetime. |
| unique_lock<mutex> __my_lock2(std::move(__my_lock)); |
| return _M_cond.wait_until(__my_lock2, __atime); |
| } |
| |
| template<typename _Lock, typename _Clock, |
| typename _Duration, typename _Predicate> |
| bool |
| wait_until(_Lock& __lock, |
| const chrono::time_point<_Clock, _Duration>& __atime, |
| _Predicate __p) |
| { |
| while (!__p()) |
| if (wait_until(__lock, __atime) == cv_status::timeout) |
| return __p(); |
| return true; |
| } |
| |
| template<typename _Lock, typename _Rep, typename _Period> |
| cv_status |
| wait_for(_Lock& __lock, const chrono::duration<_Rep, _Period>& __rtime) |
| { return wait_until(__lock, __clock_t::now() + __rtime); } |
| |
| template<typename _Lock, typename _Rep, |
| typename _Period, typename _Predicate> |
| bool |
| wait_for(_Lock& __lock, |
| const chrono::duration<_Rep, _Period>& __rtime, _Predicate __p) |
| { return wait_until(__lock, __clock_t::now() + __rtime, std::move(__p)); } |
| |
| native_handle_type |
| native_handle() |
| { return _M_cond.native_handle(); } |
| }; |
| |
| // @} group condition_variables |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 |
| |
| #endif // __GXX_EXPERIMENTAL_CXX0X__ |
| |
| #endif // _GLIBCXX_CONDITION_VARIABLE |