C++ condition_variable::timed_wait方法代码示例

    void do_test(void (this_type::*test_func)())
    {
        Lock lock(m);

        locked=false;
        done=false;

        boost::thread t(test_func,this);

        try
        {
            {
                boost::mutex::scoped_lock lk(done_mutex);
                BOOST_CHECK(!done_cond.timed_wait(lk, boost::posix_time::seconds(1),
                                                 boost::bind(&this_type::is_done,this)));
            }
            lock.unlock();
            {
                boost::mutex::scoped_lock lk(done_mutex);
                BOOST_CHECK(done_cond.timed_wait(lk, boost::posix_time::seconds(1),
                                                 boost::bind(&this_type::is_done,this)));
            }
            t.join();
            BOOST_CHECK(locked);
        }
        catch(...)
        {
            lock.unlock();
            t.join();
            throw;
        }
    }

int main()
{
#if defined(BOOST_THREAD_PLATFORM_PTHREAD)

  for (int i=0; i<3; ++i)
  {
    const time_t now_time = ::time(0);
    const time_t wait_time = now_time+1;
    time_t end_time;
    assert(now_time < wait_time);

    boost::unique_lock<boost::mutex> lk(mtx);
    //const bool res =
    (void)cv.timed_wait(lk, from_time_t(wait_time));
    end_time = ::time(0);
    std::cerr << "now_time =" << now_time << " \n";
    std::cerr << "end_time =" << end_time << " \n";
    std::cerr << "wait_time=" << wait_time << " \n";
    std::cerr << "now_time =" << from_time_t(now_time) << " \n";
    std::cerr << "end_time =" << from_time_t(end_time) << " \n";
    std::cerr << "wait_time=" << from_time_t(wait_time) << " \n";
    std::cerr << end_time - wait_time << " \n";
    assert(end_time >= wait_time);
    std::cerr << " OK\n";
  }
#endif
  return 0;
}

    void operator()()
    {
        Lock lock(m);

        typedef test_initially_unlocked_if_other_thread_has_lock<Mutex,Lock> this_type;

        boost::thread t(&this_type::locking_thread,this);

        try
        {
            {
                boost::mutex::scoped_lock lk(done_mutex);
                BOOST_CHECK(done_cond.timed_wait(lk,boost::posix_time::seconds(2),
                                                 boost::bind(&this_type::is_done,this)));
                BOOST_CHECK(!locked);
            }

            lock.unlock();
            t.join();
        }
        catch(...)
        {
            lock.unlock();
            t.join();
            throw;
        }
    }

 void relative_timed_wait_with_predicate()
 {
     boost::unique_lock<boost::mutex> lock(mutex);
     if(cond_var.timed_wait(lock,boost::posix_time::seconds(timeout_seconds),check_flag(flag)) && flag)
     {
         ++woken;
     }
 }

bool timedWaitOnMutex(boost::condition_variable &waitCond, boost::mutex &waitMutex, int secs, int msecs)
{
	boost::posix_time::ptime waitTime(boost::posix_time::microsec_clock::universal_time());
	waitTime += boost::posix_time::seconds(secs);
	waitTime += boost::posix_time::millisec(msecs);

	boost::unique_lock<boost::mutex> lock(waitMutex);
	return waitCond.timed_wait(lock, waitTime) == false;
}

 void timed_wait_with_predicate()
 {
     boost::system_time const timeout=boost::get_system_time()+boost::posix_time::seconds(timeout_seconds);
     boost::unique_lock<boost::mutex> lock(mutex);
     if(cond_var.timed_wait(lock,timeout,check_flag(flag)) && flag)
     {
         ++woken;
     }
 }

 /*!
  * The auto flusher ensures that buffers are force committed when
  * the user has not called get_new() within a certain time window.
  */
 void auto_flush(void)
 {
     boost::mutex::scoped_lock lock(_mutex);
     const bool timeout = not _cond.timed_wait(lock, AUTOFLUSH_TIMEOUT);
     if (timeout and _ok_to_auto_flush and _last_send_buff and _bytes_in_buffer != 0)
     {
         _last_send_buff->commit(_bytes_in_buffer);
         _last_send_buff.reset();
     }
 }

 void do_transaction(int comm_state) {
     lock_t lock(mtx_);
     comm_state_ = comm_state;
     lock.unlock();
     my_io_service_.send(tx_);
     lock.lock();
     while(comm_state_!=CST_IDLE){
         if(!rx_cond_var_.timed_wait(lock, boost::posix_time::milliseconds(op_timeout_ms_))){
             throw OperationTimeoutExcept();
         }
     }
 }

 BOOLEAN timed_wait_and_pop ( Data& value, INT64 millsec )
 {
    boost::system_time const timeout=boost::get_system_time() + 
          boost::posix_time::milliseconds(millsec);
    boost::mutex::scoped_lock lock ( _mutex ) ;
    while ( _queue.empty () )
       if ( !_cond.timed_wait ( lock, timeout ) )
          return FALSE ;
    value = _queue.front () ;
    _queue.pop () ;
    return TRUE ;
 }

    void timed_wait_without_predicate()
    {
        boost::system_time const timeout=boost::get_system_time()+boost::posix_time::seconds(timeout_seconds);

        boost::unique_lock<boost::mutex> lock(mutex);
        while(!flag)
        {
            if(!cond_var.timed_wait(lock,timeout))
            {
                return;
            }
        }
        ++woken;
    }

    bool timed_wait(Duration d)
    {
        boost::system_time const target=boost::get_system_time()+d;

        boost::unique_lock<boost::mutex> l(m);
        while(!flag)
        {
            if(!cond.timed_wait(l,target))
            {
                return flag;
            }
        }
        return true;
    }

 int wait(const boost::system_time& wait_until_abs_time, int* old_val = NULL) {
     #if 0
     if (old_val && *old_val != m_count) {
         *old_val = m_count;
         return 0;
     }
     #endif
     scoped_lock g(m_lock);
     try {
         return m_cond.timed_wait(g, wait_until_abs_time) ? 0 : ETIMEDOUT;
     } catch (std::exception&) {
         return -1;
     }
 }

        bool timed_lock_shared(system_time const& timeout)
        {
            boost::this_thread::disable_interruption do_not_disturb;
            boost::mutex::scoped_lock lk(state_change);

            while(state.exclusive || state.exclusive_waiting_blocked)
            {
                if(!shared_cond.timed_wait(lk,timeout))
                {
                    return false;
                }
            }
            ++state.shared_count;
            return true;
        }

/**
 * Worker thread proc for Timer objects.
 */
void Timer::TimerThreadProc(void)
{
	Utility::SetThreadName("Timer Thread");

	for (;;) {
		boost::mutex::scoped_lock lock(l_Mutex);

		typedef boost::multi_index::nth_index<TimerSet, 1>::type NextTimerView;
		NextTimerView& idx = boost::get<1>(l_Timers);

		/* Wait until there is at least one timer. */
		while (idx.empty() && !l_StopThread)
			l_CV.wait(lock);

		if (l_StopThread)
			break;

		NextTimerView::iterator it = idx.begin();
		Timer::Ptr timer = it->lock();

		if (!timer) {
			/* Remove the timer from the list if it's not alive anymore. */
			idx.erase(it);
			continue;
		}

		double wait = timer->m_Next - Utility::GetTime();

		if (wait > 0) {
			/* Make sure the timer we just examined can be destroyed while we're waiting. */
			timer.reset();

			/* Wait for the next timer. */
			l_CV.timed_wait(lock, boost::posix_time::milliseconds(wait * 1000));

			continue;
		}

		/* Remove the timer from the list so it doesn't get called again
		 * until the current call is completed. */
		l_Timers.erase(timer);

		lock.unlock();

		/* Asynchronously call the timer. */
		Utility::QueueAsyncCallback(boost::bind(&Timer::Call, timer));
	}
}

    bool wait_and_pop(T& data, boost::posix_time::microseconds waitTime)
    {
        boost::system_time            timeout = boost::get_system_time() + waitTime;
        boost::mutex::scoped_lock     lockHandle(mutexHandle);

        if (condFlag.timed_wait(lockHandle, timeout,
                                isEmpty(&queueHandle))) {
            data = queueHandle.front();
            queueHandle.pop();
            condFlag.notify_all();

            return true;
        }
        else {
            return false;
        }
    }