《BOOST程序库完全开发指南》 第12章 并发编程

先看下Linux 下的 pthread 多线程例子：

#include <pthread.h>

#include <stdio.h>

#include <time.h>



void sleep(int sec)

{

    clock_t delay = sec * CLOCKS_PER_SEC;

    clock_t start = clock();

    while(clock() - start < delay);

}

void fun1(){

    while(1){

         printf( "fun1");

    }

}



void fun2(){

    while(1){

         printf("fun2");

    }

}



int main(){

    pthread_t t1;

    pthread_t t2;

    pthread_create(&t1,NULL,(void *)fun1,NULL);

    pthread_create(&t2,NULL,(void *)fun2,NULL);

    //pthread_join(t1,NULL);    //阻塞等待线程结束

    //pthread_join(t2,NULL);

    sleep(3);

    return 0;

}

 

再看下 boost 的 thread 库的写法：

#include <iostream>

#include <boost/thread.hpp>

#include <boost/bind.hpp>



using namespace std;



void print1(string str)

{

    while(1)

    {

        cout<<str<<endl;

    }

}



void print2(string str)

{

    while(1)

    {

        cout<<str<<endl;

    }

}



int main()

{

    //boost::thread t1(boost::bind(print1,"print1"));

    //boost::thread t2(boost::bind(print2,"print2"));

    //thread的构造函数有三种

    boost::thread t1(print1,"print1");

    boost::thread t2(print2,"print2");

    t1.join();

}

 

boost 加锁：

#include <iostream>

#include <string>

#include <boost/thread.hpp>

#include <boost/thread/mutex.hpp>



using namespace std;



boost::mutex mx;



void print(int id)

{

    for(int i=0;i<10;++i)

    {

        boost::mutex::scoped_lock lock(mx);

        //如果这里没有加锁，cout中 "id:",id,"   i= ",i  可能会断开

        cout<<"id:"<<id<<"   i = "<<i<<endl;

    }

}



int main()

{

    boost::thread t1(print,3),t2(print,4);

    t1.join();

    t2.join();

}