Boost::Thread使用示例 - CG-Animation - 博客频道 - CSDN.NET
Boost::Thread的实现总体上是比较简单的,前面已经说过,thread只是一个跨平台的线程封装库,其中按照所使用的线程选项的不同,分别决定使用Windows线程API,pThread,或Mac平台的thread实现。以下只讨论Windows,即使用BOOST_HAS_WINTHREAD的情况。
Boost::Thread有两个构造函数:一个是thread(),构造一个表示当前执行线程的线程对象;一个是explicit thread(const boost::function0<void>& threadfunc),这里的boost::function0<void>可以简单看为一个无返回无参数的函数。这里的函数可以是类重载operator()构成的函数;该构造函数传入的是函数对象而并非是函数指针,这样一个具有一般函数特性的类也能作为参数传入,可以看下面的几个例子。
(1)最简单方法
- #include <boost/thread/thread.hpp>
- #include <iostream>
- void hello()
- {
- std::cout<<"Hello world, I'm a thread!"<<std::endl;
- }
- int main()
- {
- boost::thread thrd(&hello);
- thrd.join();
- system("pause");
- return 0;
- }
#include <boost/thread/thread.hpp>
#include <iostream> void hello()
{
std::cout<<"Hello world, I'm a thread!"<<std::endl;
} int main()
{
boost::thread thrd(&hello);
thrd.join(); system("pause");
return 0;
}
(2)复杂类型对象作为参数来创建线程
- #include <boost/thread/thread.hpp>
- #include <boost/thread/mutex.hpp>
- #include <iostream>
- boost::mutex io_mutex;
- struct count
- {
- count(int id) : id(id) {}
- void operator()()
- {
- for(int i = 0; i < 10; ++i)
- {
- boost::mutex::scoped_lock lock(io_mutex);
- std::cout<<id<<": "<<i<<std::endl;
- }
- }
- int id;
- };
- int main()
- {
- boost::thread thrd1(count(1));
- boost::thread thrd2(count(2));
- thrd1.join();
- thrd2.join();
- system("pause");
- return 0;
- }
#include <boost/thread/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <iostream> boost::mutex io_mutex; struct count
{
count(int id) : id(id) {} void operator()()
{
for(int i = 0; i < 10; ++i)
{
boost::mutex::scoped_lock lock(io_mutex);
std::cout<<id<<": "<<i<<std::endl;
}
} int id;
}; int main()
{
boost::thread thrd1(count(1));
boost::thread thrd2(count(2));
thrd1.join();
thrd2.join(); system("pause");
return 0;
}
(3)在类内部创建线程
类内部静态方法启动线程
- #include <boost/thread/thread.hpp>
- #include <iostream>
- class HelloWorld
- {
- public:
- static void hello()
- {
- std::cout<<"Hello world, I'm a thread!"<<std::endl;
- }
- static void start()
- {
- boost::thread thrd(hello);
- thrd.join();
- }
- };
- int main()
- {
- HelloWorld::start();
- system("pause");
- return 0;
- }
#include <boost/thread/thread.hpp>
#include <iostream> class HelloWorld
{
public:
static void hello()
{
std::cout<<"Hello world, I'm a thread!"<<std::endl;
}
static void start()
{
boost::thread thrd(hello);
thrd.join();
}
}; int main()
{
HelloWorld::start(); system("pause");
return 0;
}在这里,start()和hello()方法都必须是static方法。如果要求start()和hello()方法不能是静态方法则采用下面的方法创建线程:
- #include <boost/function/function0.hpp>
- #include <boost/thread/thread.hpp>
- #include <iostream>
- class HelloWorld
- {
- public:
- void hello()
- {
- std::cout<<"Hello world, I'm a thread!"<<std::endl;
- }
- void start()
- {
- boost::function0<void> f = boost::bind(&HelloWorld::hello, this);
- boost::thread thrd(f);
- thrd.join();
- }
- };
- int main()
- {
- HelloWorld hello;
- hello.start();
- system("pause");
- return 0;
- }
#include <boost/function/function0.hpp>
#include <boost/thread/thread.hpp>
#include <iostream> class HelloWorld
{
public:
void hello()
{
std::cout<<"Hello world, I'm a thread!"<<std::endl;
}
void start()
{
boost::function0<void> f = boost::bind(&HelloWorld::hello, this);
boost::thread thrd(f);
thrd.join();
}
}; int main()
{
HelloWorld hello;
hello.start(); system("pause");
return 0;
}(3)在Singleton模式内部创建线程:
- #include <boost/thread/thread.hpp>
- #include <iostream>
- class HelloWorld
- {
- public:
- void hello()
- {
- std::cout<<"Hello world, I'm a thread!"<<std::endl;
- }
- static void start()
- {
- boost::thread thrd(boost::bind(&HelloWorld::hello, &HelloWorld::getInstance()));
- thrd.join();
- }
- static HelloWorld& getInstance()
- {
- if(!instance)
- instance = new HelloWorld;
- return *instance;
- }
- private:
- HelloWorld() {}
- static HelloWorld* instance;
- };
- HelloWorld* HelloWorld::instance = 0;
- int main()
- {
- HelloWorld::start();
- system("pause");
- return 0;
- }
#include <boost/thread/thread.hpp>
#include <iostream> class HelloWorld
{
public:
void hello()
{
std::cout<<"Hello world, I'm a thread!"<<std::endl;
}
static void start()
{
boost::thread thrd(boost::bind(&HelloWorld::hello, &HelloWorld::getInstance()));
thrd.join();
}
static HelloWorld& getInstance()
{
if(!instance)
instance = new HelloWorld;
return *instance;
}
private:
HelloWorld() {}
static HelloWorld* instance;
}; HelloWorld* HelloWorld::instance = 0;
int main()
{
HelloWorld::start(); system("pause");
return 0;
}(4)用类内部函数在类外部创建线程
- #include <boost/thread/thread.hpp>
- #include <iostream>
- #include <string>
- class HelloWorld
- {
- public:
- void hello(const std::string& str)
- {
- std::cout<<str<<std::endl;
- }
- };
- int main()
- {
- HelloWorld obj;
- boost::thread thrd(boost::bind(&HelloWorld::hello, &obj, "Hello World, I'm a thread!"));
- thrd.join();
- system("pause");
- return 0;
- }
#include <boost/thread/thread.hpp>
#include <iostream>
#include <string> class HelloWorld
{
public:
void hello(const std::string& str)
{
std::cout<<str<<std::endl;
}
}; int main()
{
HelloWorld obj;
boost::thread thrd(boost::bind(&HelloWorld::hello, &obj, "Hello World, I'm a thread!"));
thrd.join(); system("pause");
return 0;
}
- 如果需要绑定的函数有参数则需要使用boost::bind。比如想使用boost::thread创建一个线程来执行函数void f(int i),如果这样写boost::thread thrd(f)是不对的,因为thread构造函数声明接受的是一个没有参数且返回类型为void的函数,而且不提供参数f也无法运行,这时就可以写boost::thread thrd(boost::bind(f, 1))。涉及到有参函数的绑定问题基本上都是boost::thread、boost::function、boost::bind结合起来使用。
如果需要绑定的函数有参数则需要使用boost::bind。比如想使用boost::thread创建一个线程来执行函数void f(int i),如果这样写boost::thread thrd(f)是不对的,因为thread构造函数声明接受的是一个没有参数且返回类型为void的函数,而且不提供参数f也无法运行,这时就可以写boost::thread thrd(boost::bind(f, 1))。涉及到有参函数的绑定问题基本上都是boost::thread、boost::function、boost::bind结合起来使用。参考:
http://www.cnblogs.com/VRS_technology/archive/2010/09/15/1826812.html
http://www.blogjava.net/LittleDS/archive/2008/05/18/201236.html