將建立執行緒的API-pthread_create封裝成一個執行緒類

之前寫的多執行緒都是在主程式中呼叫執行緒的API，這裡為每一個執行緒封裝成一個類；建立了一個執行緒物件，也就是建立了一個執行緒；

MyThread.h

/*************************************************************************
	> File Name: MyThread.h
	> Author: 
	> Mail: 
	> Created Time: 2015年12月14日 星期一 16時23分17秒
 ************************************************************************/

#ifndef _MYTHREAD_H
#define _MYTHREAD_H

#include <iostream>
#include <pthread.h>
#include <string>

using std::string;

class MyThread{
    public:
        MyThread();
        ~MyThread();
        void set_name(string name);
        string get_name();
        pthread_t get_pid();
        void run(void *(*fun)(void *), void *arg);
        void join();
        void do_something();//not use
        friend void * thread_routine(void *arg);//not use
    private:
        pthread_t pid;
        string thread_name;
};

#endif

MyThread.cpp

/*************************************************************************
	> File Name: MyThread.cpp
	> Author: 
	> Mail: 
	> Created Time: 2015年12月14日 星期一 16時31分43秒
 ************************************************************************/

#include "MyThread.h"
using namespace std;

MyThread::MyThread()
{
    
}

MyThread::~MyThread()
{
    pthread_join(pid, NULL);
}

void MyThread::set_name(string name)
{
    thread_name = name;
}

string MyThread::get_name()
{
    return thread_name;
}

pthread_t MyThread::get_pid()
{
    return pid;
}
void MyThread::run(void *(*fun)(void *), void *arg)
{
    pthread_create(&pid, NULL, fun, arg);
}

void MyThread::join()
{
    pthread_join(pid, NULL);
}

/*not use*/
void MyThread::do_something()
{
   cout << "thread id is " << pid << ", name is " << thread_name << endl;
}

/*not use*/
void * thread_routine(void *arg)
{
    MyThread * pthread;
    pthread = static_cast<MyThread *>(arg);
    pthread->do_something();

    return NULL;
}

main.cpp

/*************************************************************************
	> File Name: main.cpp
	> Author: 
	> Mail: 
	> Created Time: 2015年12月14日 星期一 16時13分21秒
 ************************************************************************/

#include <cstdlib>
#include <string.h>
#include "MyThread.h"

using namespace std;

void *thread_fun(void * arg)
{
    cout << "this is thread routine..." <<  endl;

    return NULL;
}


int main(int argc, char *argv[])
{
    int i = 0, num = 0;

    if (argc != 2){
        cout << "input the number of thread object you want to create...." << endl;
        exit(-1);
    }
    
    num = atoi(argv[1]);
    MyThread thread[num];
    
    cout << "I will create " << num << " threads." << endl;
    for (i = 0; i < num; ++i){
        thread[i].set_name("thread");
    }

    for(i = 0; i < num; ++i){
        thread[i].run(thread_fun, NULL);
        cout << thread[i].get_name() << " pid is " << thread[i].get_pid() <<  " is running.." << endl;
    } 

    for(i = 0; i < num; ++i){
        thread[i].join();
    } 
    
    cout << "main thread exit....." << endl;

    exit(0);
}