568 lines
18 KiB
C++
568 lines
18 KiB
C++
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#ifndef BOOST_THREAD_CONDITION_VARIABLE_WIN32_HPP
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#define BOOST_THREAD_CONDITION_VARIABLE_WIN32_HPP
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// (C) Copyright 2007-8 Anthony Williams
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// (C) Copyright 2011-2012 Vicente J. Botet Escriba
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#include <boost/thread/win32/thread_primitives.hpp>
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#include <boost/thread/win32/thread_data.hpp>
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#include <boost/thread/win32/thread_data.hpp>
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#include <boost/thread/win32/interlocked_read.hpp>
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#include <boost/thread/cv_status.hpp>
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#if defined BOOST_THREAD_USES_DATETIME
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#include <boost/thread/xtime.hpp>
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#endif
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/thread_time.hpp>
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#include <boost/thread/lock_guard.hpp>
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#include <boost/thread/lock_types.hpp>
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#include <boost/assert.hpp>
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#include <boost/intrusive_ptr.hpp>
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#ifdef BOOST_THREAD_USES_CHRONO
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#include <boost/chrono/system_clocks.hpp>
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#include <boost/chrono/ceil.hpp>
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#endif
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#include <limits.h>
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#include <algorithm>
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#include <vector>
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#include <boost/config/abi_prefix.hpp>
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namespace boost
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{
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namespace detail
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{
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class basic_cv_list_entry;
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void intrusive_ptr_add_ref(basic_cv_list_entry * p);
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void intrusive_ptr_release(basic_cv_list_entry * p);
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class basic_cv_list_entry
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{
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private:
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detail::win32::handle_manager semaphore;
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detail::win32::handle_manager wake_sem;
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long waiters;
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bool notified;
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long references;
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public:
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BOOST_THREAD_NO_COPYABLE(basic_cv_list_entry)
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explicit basic_cv_list_entry(detail::win32::handle_manager const& wake_sem_):
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semaphore(detail::win32::create_anonymous_semaphore(0,LONG_MAX)),
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wake_sem(wake_sem_.duplicate()),
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waiters(1),notified(false),references(0)
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{}
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static bool no_waiters(boost::intrusive_ptr<basic_cv_list_entry> const& entry)
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{
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return !detail::interlocked_read_acquire(&entry->waiters);
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}
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void add_waiter()
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{
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BOOST_INTERLOCKED_INCREMENT(&waiters);
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}
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void remove_waiter()
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{
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BOOST_INTERLOCKED_DECREMENT(&waiters);
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}
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void release(unsigned count_to_release)
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{
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notified=true;
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detail::win32::ReleaseSemaphore(semaphore,count_to_release,0);
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}
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void release_waiters()
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{
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release(detail::interlocked_read_acquire(&waiters));
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}
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bool is_notified() const
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{
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return notified;
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}
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bool wait(timeout abs_time)
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{
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return this_thread::interruptible_wait(semaphore,abs_time);
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}
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bool woken()
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{
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unsigned long const woken_result=detail::win32::WaitForSingleObjectEx(wake_sem,0,0);
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BOOST_ASSERT((woken_result==detail::win32::timeout) || (woken_result==0));
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return woken_result==0;
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}
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friend void intrusive_ptr_add_ref(basic_cv_list_entry * p);
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friend void intrusive_ptr_release(basic_cv_list_entry * p);
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};
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inline void intrusive_ptr_add_ref(basic_cv_list_entry * p)
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{
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BOOST_INTERLOCKED_INCREMENT(&p->references);
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}
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inline void intrusive_ptr_release(basic_cv_list_entry * p)
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{
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if(!BOOST_INTERLOCKED_DECREMENT(&p->references))
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{
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delete p;
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}
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}
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class basic_condition_variable
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{
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boost::mutex internal_mutex;
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long total_count;
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unsigned active_generation_count;
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typedef basic_cv_list_entry list_entry;
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typedef boost::intrusive_ptr<list_entry> entry_ptr;
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typedef std::vector<entry_ptr> generation_list;
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generation_list generations;
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detail::win32::handle_manager wake_sem;
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void wake_waiters(long count_to_wake)
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{
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detail::interlocked_write_release(&total_count,total_count-count_to_wake);
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detail::win32::ReleaseSemaphore(wake_sem,count_to_wake,0);
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}
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template<typename lock_type>
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struct relocker
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{
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BOOST_THREAD_NO_COPYABLE(relocker)
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lock_type& lock;
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bool unlocked;
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relocker(lock_type& lock_):
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lock(lock_),unlocked(false)
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{}
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void unlock()
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{
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lock.unlock();
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unlocked=true;
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}
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~relocker()
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{
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if(unlocked)
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{
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lock.lock();
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}
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}
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};
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entry_ptr get_wait_entry()
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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if(!wake_sem)
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{
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wake_sem=detail::win32::create_anonymous_semaphore(0,LONG_MAX);
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BOOST_ASSERT(wake_sem);
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}
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detail::interlocked_write_release(&total_count,total_count+1);
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if(generations.empty() || generations.back()->is_notified())
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{
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entry_ptr new_entry(new list_entry(wake_sem));
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generations.push_back(new_entry);
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return new_entry;
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}
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else
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{
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generations.back()->add_waiter();
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return generations.back();
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}
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}
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struct entry_manager
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{
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entry_ptr const entry;
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boost::mutex& internal_mutex;
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BOOST_THREAD_NO_COPYABLE(entry_manager)
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entry_manager(entry_ptr const& entry_, boost::mutex& mutex_):
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entry(entry_), internal_mutex(mutex_)
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{}
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~entry_manager()
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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entry->remove_waiter();
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}
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list_entry* operator->()
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{
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return entry.get();
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}
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};
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protected:
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template<typename lock_type>
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bool do_wait(lock_type& lock,timeout abs_time)
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{
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relocker<lock_type> locker(lock);
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entry_manager entry(get_wait_entry(), internal_mutex);
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locker.unlock();
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bool woken=false;
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while(!woken)
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{
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if(!entry->wait(abs_time))
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{
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return false;
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}
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woken=entry->woken();
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}
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return woken;
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}
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template<typename lock_type,typename predicate_type>
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bool do_wait(lock_type& m,timeout const& abs_time,predicate_type pred)
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{
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while (!pred())
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{
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if(!do_wait(m, abs_time))
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return pred();
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}
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return true;
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}
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basic_condition_variable(const basic_condition_variable& other);
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basic_condition_variable& operator=(const basic_condition_variable& other);
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public:
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basic_condition_variable():
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total_count(0),active_generation_count(0),wake_sem(0)
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{}
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~basic_condition_variable()
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{}
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void notify_one() BOOST_NOEXCEPT
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{
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if(detail::interlocked_read_acquire(&total_count))
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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if(!total_count)
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{
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return;
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}
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wake_waiters(1);
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for(generation_list::iterator it=generations.begin(),
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end=generations.end();
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it!=end;++it)
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{
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(*it)->release(1);
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}
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generations.erase(std::remove_if(generations.begin(),generations.end(),&basic_cv_list_entry::no_waiters),generations.end());
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}
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}
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void notify_all() BOOST_NOEXCEPT
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{
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if(detail::interlocked_read_acquire(&total_count))
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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if(!total_count)
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{
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return;
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}
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wake_waiters(total_count);
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for(generation_list::iterator it=generations.begin(),
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end=generations.end();
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it!=end;++it)
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{
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(*it)->release_waiters();
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}
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generations.clear();
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wake_sem=detail::win32::handle(0);
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}
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}
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};
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}
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class condition_variable:
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private detail::basic_condition_variable
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{
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public:
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BOOST_THREAD_NO_COPYABLE(condition_variable)
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condition_variable()
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{}
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using detail::basic_condition_variable::notify_one;
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using detail::basic_condition_variable::notify_all;
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void wait(unique_lock<mutex>& m)
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{
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do_wait(m,detail::timeout::sentinel());
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}
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template<typename predicate_type>
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void wait(unique_lock<mutex>& m,predicate_type pred)
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{
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while(!pred()) wait(m);
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}
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#if defined BOOST_THREAD_USES_DATETIME
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bool timed_wait(unique_lock<mutex>& m,boost::system_time const& abs_time)
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{
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return do_wait(m,abs_time);
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}
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bool timed_wait(unique_lock<mutex>& m,boost::xtime const& abs_time)
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{
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return do_wait(m,system_time(abs_time));
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}
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template<typename duration_type>
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bool timed_wait(unique_lock<mutex>& m,duration_type const& wait_duration)
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{
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if (wait_duration.is_pos_infinity())
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{
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wait(m); // or do_wait(m,detail::timeout::sentinel());
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return true;
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}
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if (wait_duration.is_special())
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{
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return true;
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}
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return do_wait(m,wait_duration.total_milliseconds());
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}
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template<typename predicate_type>
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bool timed_wait(unique_lock<mutex>& m,boost::system_time const& abs_time,predicate_type pred)
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{
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return do_wait(m,abs_time,pred);
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}
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template<typename predicate_type>
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bool timed_wait(unique_lock<mutex>& m,boost::xtime const& abs_time,predicate_type pred)
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{
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return do_wait(m,system_time(abs_time),pred);
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}
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template<typename duration_type,typename predicate_type>
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bool timed_wait(unique_lock<mutex>& m,duration_type const& wait_duration,predicate_type pred)
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{
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if (wait_duration.is_pos_infinity())
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{
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while (!pred())
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{
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wait(m); // or do_wait(m,detail::timeout::sentinel());
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}
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return true;
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}
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if (wait_duration.is_special())
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{
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return pred();
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}
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return do_wait(m,wait_duration.total_milliseconds(),pred);
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}
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#endif
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#ifdef BOOST_THREAD_USES_CHRONO
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template <class Clock, class Duration>
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cv_status
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wait_until(
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unique_lock<mutex>& lock,
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const chrono::time_point<Clock, Duration>& t)
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{
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using namespace chrono;
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chrono::time_point<Clock, Duration> now = Clock::now();
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if (t<=now) {
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return cv_status::timeout;
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}
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do_wait(lock, ceil<milliseconds>(t-now).count());
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return Clock::now() < t ? cv_status::no_timeout :
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cv_status::timeout;
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}
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template <class Rep, class Period>
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cv_status
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wait_for(
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unique_lock<mutex>& lock,
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const chrono::duration<Rep, Period>& d)
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{
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using namespace chrono;
|
||
|
|
if (d<=chrono::duration<Rep, Period>::zero()) {
|
||
|
|
return cv_status::timeout;
|
||
|
|
}
|
||
|
|
|
||
|
|
steady_clock::time_point c_now = steady_clock::now();
|
||
|
|
do_wait(lock, ceil<milliseconds>(d).count());
|
||
|
|
return steady_clock::now() - c_now < d ? cv_status::no_timeout :
|
||
|
|
cv_status::timeout;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class Clock, class Duration, class Predicate>
|
||
|
|
bool
|
||
|
|
wait_until(
|
||
|
|
unique_lock<mutex>& lock,
|
||
|
|
const chrono::time_point<Clock, Duration>& t,
|
||
|
|
Predicate pred)
|
||
|
|
{
|
||
|
|
while (!pred())
|
||
|
|
{
|
||
|
|
if (wait_until(lock, t) == cv_status::timeout)
|
||
|
|
return pred();
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
template <class Rep, class Period, class Predicate>
|
||
|
|
bool
|
||
|
|
wait_for(
|
||
|
|
unique_lock<mutex>& lock,
|
||
|
|
const chrono::duration<Rep, Period>& d,
|
||
|
|
Predicate pred)
|
||
|
|
{
|
||
|
|
return wait_until(lock, chrono::steady_clock::now() + d, boost::move(pred));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
class condition_variable_any:
|
||
|
|
private detail::basic_condition_variable
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
BOOST_THREAD_NO_COPYABLE(condition_variable_any)
|
||
|
|
condition_variable_any()
|
||
|
|
{}
|
||
|
|
|
||
|
|
using detail::basic_condition_variable::notify_one;
|
||
|
|
using detail::basic_condition_variable::notify_all;
|
||
|
|
|
||
|
|
template<typename lock_type>
|
||
|
|
void wait(lock_type& m)
|
||
|
|
{
|
||
|
|
do_wait(m,detail::timeout::sentinel());
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename lock_type,typename predicate_type>
|
||
|
|
void wait(lock_type& m,predicate_type pred)
|
||
|
|
{
|
||
|
|
while(!pred()) wait(m);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined BOOST_THREAD_USES_DATETIME
|
||
|
|
template<typename lock_type>
|
||
|
|
bool timed_wait(lock_type& m,boost::system_time const& abs_time)
|
||
|
|
{
|
||
|
|
return do_wait(m,abs_time);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename lock_type>
|
||
|
|
bool timed_wait(lock_type& m,boost::xtime const& abs_time)
|
||
|
|
{
|
||
|
|
return do_wait(m,system_time(abs_time));
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename lock_type,typename duration_type>
|
||
|
|
bool timed_wait(lock_type& m,duration_type const& wait_duration)
|
||
|
|
{
|
||
|
|
return do_wait(m,wait_duration.total_milliseconds());
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename lock_type,typename predicate_type>
|
||
|
|
bool timed_wait(lock_type& m,boost::system_time const& abs_time,predicate_type pred)
|
||
|
|
{
|
||
|
|
return do_wait(m,abs_time,pred);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename lock_type,typename predicate_type>
|
||
|
|
bool timed_wait(lock_type& m,boost::xtime const& abs_time,predicate_type pred)
|
||
|
|
{
|
||
|
|
return do_wait(m,system_time(abs_time),pred);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename lock_type,typename duration_type,typename predicate_type>
|
||
|
|
bool timed_wait(lock_type& m,duration_type const& wait_duration,predicate_type pred)
|
||
|
|
{
|
||
|
|
return do_wait(m,wait_duration.total_milliseconds(),pred);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#ifdef BOOST_THREAD_USES_CHRONO
|
||
|
|
|
||
|
|
template <class lock_type, class Clock, class Duration>
|
||
|
|
cv_status
|
||
|
|
wait_until(
|
||
|
|
lock_type& lock,
|
||
|
|
const chrono::time_point<Clock, Duration>& t)
|
||
|
|
{
|
||
|
|
using namespace chrono;
|
||
|
|
chrono::time_point<Clock, Duration> now = Clock::now();
|
||
|
|
if (t<=now) {
|
||
|
|
return cv_status::timeout;
|
||
|
|
}
|
||
|
|
do_wait(lock, ceil<milliseconds>(t-now).count());
|
||
|
|
return Clock::now() < t ? cv_status::no_timeout :
|
||
|
|
cv_status::timeout;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class lock_type, class Rep, class Period>
|
||
|
|
cv_status
|
||
|
|
wait_for(
|
||
|
|
lock_type& lock,
|
||
|
|
const chrono::duration<Rep, Period>& d)
|
||
|
|
{
|
||
|
|
using namespace chrono;
|
||
|
|
if (d<=chrono::duration<Rep, Period>::zero()) {
|
||
|
|
return cv_status::timeout;
|
||
|
|
}
|
||
|
|
steady_clock::time_point c_now = steady_clock::now();
|
||
|
|
do_wait(lock, ceil<milliseconds>(d).count());
|
||
|
|
return steady_clock::now() - c_now < d ? cv_status::no_timeout :
|
||
|
|
cv_status::timeout;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class lock_type, class Clock, class Duration, class Predicate>
|
||
|
|
bool
|
||
|
|
wait_until(
|
||
|
|
lock_type& lock,
|
||
|
|
const chrono::time_point<Clock, Duration>& t,
|
||
|
|
Predicate pred)
|
||
|
|
{
|
||
|
|
while (!pred())
|
||
|
|
{
|
||
|
|
if (wait_until(lock, t) == cv_status::timeout)
|
||
|
|
return pred();
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class lock_type, class Rep, class Period, class Predicate>
|
||
|
|
bool
|
||
|
|
wait_for(
|
||
|
|
lock_type& lock,
|
||
|
|
const chrono::duration<Rep, Period>& d,
|
||
|
|
Predicate pred)
|
||
|
|
{
|
||
|
|
return wait_until(lock, chrono::steady_clock::now() + d, boost::move(pred));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
BOOST_THREAD_DECL void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk);
|
||
|
|
}
|
||
|
|
|
||
|
|
#include <boost/config/abi_suffix.hpp>
|
||
|
|
|
||
|
|
#endif
|