促进线程间通信

我必须实现boost线程间通信。请考虑以下代码：

#include <boost/thread/thread.hpp>
#include <Windows.h>
void threadA()
{
    while(true)
    {
        std::cout << "From thread A" << std::endl;
        Sleep(3000); //pretend to do the work
    }
}
void threadB()
{
    while(true)
    {
        std::cout << "From thread B" << std::endl;
        Sleep(3000); //pretend to do the work
    }
}
int main()
{
    boost::thread *th1 = new boost::thread(&threadA);
    boost::thread *th2 = new boost::thread(&threadB);
    th1->join();
    th2->join();
    delete th1;
    delete th2;
}

如果我运行上面的代码，它将生成两个线程。我想做的是启动threadA并向threadB发送一些消息，收到后将启动线程。或者更一般地说，如果这两个线程独立运行，我如何处理通信？