在BOOST中如何在线程中发送信号，并在另一个线程中执行相应的时隙？ [英] how in BOOST send a signal in a thread and have the corresponding slot executed in another thread?

问题描述

在Qt中，例如，如果你在GUI线程之外的线程中发出一个信号，信号被排队并在GUI线程中执行，是否有办法用boost？

In Qt for instance if you emit a signal in a thread other that the GUI thread, the signal is enqueued and executed later in the GUI thread, is there a way to do that with boost?

感谢

推荐答案

对于事件循环，使用boost :: asio :: io_service。您可以在此对象内部发布任务，并让另一个线程以线程安全的方式执行它们：

For an event loop use boost::asio::io_service. You can post tasks inside this object and have another thread execute them, in a thread safe way:

struct MyClass
{
    boost::io_service service;
    void doSomethingOp() const { ... }

    void doSomething()
    {
        service.post(boost::bind(&MyClass::doSomethingOp, this));
    }

    void loop()
    {
            service.run(); // processes the tasks
    }
};

boost::signal<void()> mySignal;

MyClass myClass;
mySignal.connect(boost::bind(&MyClass::doSomething, boost::ref(myClass)));

// launches a thread and executes myClass.loop() there
boost::thread t(boost::bind(&MyClass::loop(), boost::ref(myClass)));

// calls myClass.doSomething() in this thread, but loop() executes it in the other
mySignal(); 

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