deadline_timer奇怪的行为
deadline_timer strange behavior
我有一个这样的测试类。我想做的是继续运行这个对象中的三个计时器。但是在我实例化一个对象后,一些计时器会不断重复,但其他计时器会在大约 3 分钟后消失。谁能为我解释一下?
class EventProcessor
{
private:
boost::asio::deadline_timer* m_Timer0;
boost::asio::deadline_timer* m_Timer1;
boost::asio::deadline_timer* m_Timer2;
boost::asio::io_service io0;
boost::asio::io_service io1;
boost::asio::io_service io2;
int TimerInterval[3];
boost::asio::deadline_timer* Timers[3];
public:
EventProcessor(int p_0, int p_1, int p_2)
{
TimerInterval[0] = p_0;
TimerInterval[1] = p_1;
TimerInterval[2] = p_2;
m_Timer0= new boost::asio::deadline_timer(io0, boost::posix_time::seconds(TimerInterval[0]));
Timers[0] = m_Timer0;
m_Timer1 = new boost::asio::deadline_timer(io1, boost::posix_time::seconds(TimerInterval[1]));
Timers[1] = m_Timer1;
m_Timer2 = new boost::asio::deadline_timer(io2, boost::posix_time::seconds(TimerInterval[2]));
Timers[2] = m_Timer2;
m_Timer0->async_wait(boost::bind(&EventProcessor::HandleExpire, this, boost::asio::placeholders::error, 0));
m_Timer1->async_wait(boost::bind(&EventProcessor::HandleExpire, this, boost::asio::placeholders::error, 1));
m_Timer2->async_wait(boost::bind(&EventProcessor::HandleExpire, this, boost::asio::placeholders::error, 2));
StartWithNewThread(0);
StartWithNewThread(1);
StartWithNewThread(2);
}
private:
void HandleExpire(const boost::system::error_code& p_ec, int p_TimerIndex)
{
if(p_ec == boost::asio::error::operation_aborted)
{
std::cout << "Timer" << p_TimerIndex << " canceled" << std::endl;
return;
}
std::cout << "Timer" << p_TimerIndex << " expired" << std::endl;
//Reset(p_OriginalTimer, TimerInterval[p_TimerIndex], p_TimerIndex);
boost::thread Thread(boost::bind(&EventProcessor::Reset, this, p_TimerIndex, TimerInterval[p_TimerIndex]));
}
void Start(int p_Index)
{
boost::asio::io_service& UnderlyingIO = Timers[p_Index]->get_io_service();
UnderlyingIO.reset();
UnderlyingIO.run();
UnderlyingIO.stop();
return;
}
void StartWithNewThread(int p_Index)
{
boost::thread Thread(boost::bind(&EventProcessor::Start, this, p_Index));
std::cout << Thread.get_id() << "<->" << "Timer" << p_Index << std::endl;
return;
}
public:
void Reset(int p_Index, int p_Seconds)
{
Timers[p_Index]->cancel();
Timers[p_Index]->expires_from_now(boost::posix_time::time_duration(0,0,p_Seconds,0));
TimerInterval[p_Index] = p_Seconds;
Timers[p_Index]->async_wait(boost::bind(&EventProcessor::HandleExpire, this, boost::asio::placeholders::error, p_Index));
boost::asio::io_service& UnderlyingIO = Timers[p_Index]->get_io_service();
UnderlyingIO.reset();
UnderlyingIO.run();
UnderlyingIO.stop();
return;
}
};
所以这是你应该怎么做的:
#include "test.h"
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/atomic.hpp>
class EventProcessor
{
private:
std::unique_ptr<boost::asio::deadline_timer> m_Timers[3];
boost::asio::io_service service;
boost::atomic<int> TimerInterval[3];
public:
EventProcessor(int time0,int time1, int time2)
{
TimerInterval[0] = time0;
TimerInterval[1] = time1;
TimerInterval[2] = time2;
for (int i = 0; i < 3; i++)
{
m_Timers[i].reset(
new boost::asio::deadline_timer(service));
}
}
~EventProcessor()
{
service.stop();
for (int i = 0; i < 3; i++)
{
m_Timers[i]->cancel();
}
}
void Run()
{
for (int i = 0; i < 3; i++)
{
m_Timers[i]->expires_from_now(boost::posix_time::seconds(TimerInterval[i]));
m_Timers[i]->async_wait(boost::bind(&EventProcessor::HandleExpire,
this,
i,
_1));
}
service.run();
}
void RunAsync()
{
boost::thread(boost::bind(&EventProcessor::Run,this));
}
void Reset(int i,int seconds)
{
TimerInterval[i] = seconds;
m_Timers[i]->expires_from_now(boost::posix_time::seconds(TimerInterval[i]));
m_Timers[i]->async_wait(boost::bind(&EventProcessor::HandleExpire,
this,
i,
_1));
}
private:
void HandleExpire(int p_TimerIndex, const boost::system::error_code& error)
{
if(error == boost::asio::error::operation_aborted)
{
std::cout << "Timer" << p_TimerIndex << " canceled" << std::endl;
return;
}
std::cout << "Timer" << p_TimerIndex << " expired" << std::endl;
//Reset(p_OriginalTimer, TimerInterval[p_TimerIndex], p_TimerIndex);
m_Timers[p_TimerIndex]->expires_from_now(
boost::posix_time::seconds(TimerInterval[p_TimerIndex]));
m_Timers[p_TimerIndex]->async_wait(boost::bind(&EventProcessor::HandleExpire,
this,
p_TimerIndex,
_1));
}
};
int main()
{
EventProcessor ev(1,2,3);
ev.RunAsync();
getchar();
ev.Reset(2,4);
getchar();
}
当然,我没有任何花哨的检查器来查看您当前是否正在运行(如果您希望安全使用,您完全需要它)。
您可以将 boost::asio::io_service 视为可以进行异步调用的上下文。它会创建要处理的消息的 FIFO 队列,并在您告诉它的时间和时间处理它们。处理这些消息的最常见方法是 boost::asio::io_service::run,它将处理消息,直到没有剩余的操作。"没有什么可做的"是一个灵活的定义:它并不一定意味着有消息要处理,只是有事情要做。像截止日期计时器这样的东西可以确保只要async_wait正在进行,直到调用处理程序为止,就有"要做的事情"。您可以通过创建 boost::asio::io_service::work 实例来手动强制执行某些操作。这使得在工作对象的生存期内"还有一些事情要做"。
截止时间计时器类为您处理所有异步调用,因此您不必生成所有这些线程。io_service执行同步,这对于防止恼人的控制问题是必要的。
所以对于你的代码问题:
由于所有这些线程都控制着io_service,很难说出到底出了什么问题......我必须猜测可能出现的问题。我会把钱放在某个地方,你在截止日期计时器超时之前调用io_service::cancel,这将停止你的循环。我通过在一个同步线程(io_service::run 调用)中执行所有控制(调用 wait_async)并在我希望代码停止时才调用 io_service::cancel 来解决这个问题。
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