Boost线程问题 [英] Boost thread questions

问题描述

我想尝试以下操作

class a{
public:
  void Start();
  void Tick();
  bool IsTimeOut;
};

void a::Start()
{
  boost::thread thread1(boost::bind(&a::Tick,this));
}
void a::Tick()
{
  while(!IsTimeOut)
  {
    boost::this_thread::sleep(boost::posix_time::millisec(1000));
  }
}

我的环境是vs2005和win7。

My environment is vs2005 and win7.

但是，我总是在调试中遇到访问冲突。

However, I always got the access violation in the debug.

推荐答案

在这种情况下的违例表示线程运行超过 a 对象的生命周期。

An access violation in this case would indicate that the thread is running beyond the lifetime of the a object.

IsTimeOut 需要是原子的或者由互斥体保护，如果它是由另一个线程写的，否则您的程序可能无法正常工作，但这不应该导致访问冲突。

IsTimeOut needs to either be atomic or protected by a mutex if it is written by another thread, otherwise your program might not work correctly, but this shouldn't cause the access violation.

您立即销毁 boost :: thread 对象，因此分离线程，因此您无法等待它完成。我建议将线程对象存储为 a 的成员变量，并在 a 的析构函数中加入它，或提供与线程联接的显式 wait（）成员函数。

You are destroying the boost::thread object immediately, and thus detaching the thread, so you have no way of waiting for it to finish. I would suggest storing the thread object as a member variable of a, and either joining with it in the destructor of a or providing an explicit wait() member function that joins with the thread.

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