100分求解：将这个C语言写的线程程序改写成C++程序

  1<stdio.h>   
  2#include <unistd.h>   
  3#include <stdlib.h>   
  4#include <pthread.h>   
  5void *thread_function(void *arg);   
  6char message[]="Hello World";   
  7int main()   
  8{   
  9int res;   
 10pthread_t a_thread;   
 11void *thread_result;   
 12res=pthread_create(&amp;a_thread,NULL,thread_function,(void *)message);   
 13if(res!=0)   
 14{   
 15perror("Thread creation failed");   
 16exit(EXIT_FAILURE);   
 17}   
 18printf("Waiting for thread to finish...\n");   
 19res=pthread_join(a_thread,&amp;thread_result);   
 20if(res!=0)   
 21{   
 22perror("Thread join failed");   
 23exit(EXIT_FAILURE);   
 24}   
 25printf("Thread joined,it returned %s\n",(char *)thread_result);   
 26printf("Message is now %s\n",message);   
 27exit(EXIT_SUCCESS);   
 28}   
 29void *thread_function(void *arg)   
 30{   
 31printf("thread_function is running.Argument was %s\n",arg);   
 32sleep(3);   
 33strcpy(message,"bye!");   
 34pthread_exit("Thank you for the CPU time");   
 35}   
 36  
 37我改写的程序，但编译不通过。   
 38test.h:   
 39  
 40#ifndef __TEST_H__   
 41#define __TEST_H__   
 42#include <stdio.h>   
 43#include <unistd.h>   
 44#include <stdlib.h>   
 45#include <pthread.h>   
 46#include <string.h>   
 47class test   
 48{   
 49public:   
 50  
 51int res;   
 52pthread_t a_thread;   
 53void *thread_result;   
 54char message[10];   
 55void *thread_function(void *arg);   
 56int start();   
 57};   
 58#endif   
 59  
 60test.cpp:   
 61  
 62#include "Serial1.h"   
 63main()   
 64{   
 65test main;   
 66main.start();   
 67}   
 68  
 69int test::start()   
 70{   
 71char a[]="Hello World";   
 72strcpy(message,a);   
 73res=pthread_create(&amp;a_thread,NULL,thread_function,(void *)message);   
 74if(res!=0)   
 75{   
 76perror("Thread creation failed");   
 77exit(EXIT_FAILURE);   
 78}   
 79printf("Waiting for thread to finish...\n");   
 80res=pthread_join(a_thread,&amp;thread_result);   
 81if(res!=0)   
 82{   
 83perror("Thread join failed");   
 84exit(EXIT_FAILURE);   
 85}   
 86printf("Thread joined,it returned %s\n",(char *)thread_result);   
 87  
 88printf("Message is now %s\n",(char *)message);   
 89exit(EXIT_SUCCESS);   
 90  
 91}   
 92void * test::thread_function(void *arg)   
 93{   
 94printf("thread_function is running.Argument was %s\n",arg);   
 95sleep(3);   
 96strcpy((char *)arg,"bye!");   
 97pthread_exit(arg);   
 98}   
 99  
100请大家帮忙修改，指点！！   
101  
102\---------------------------------------------------------------   
103  
104在test的申明中， 把void *thread_function(void *arg); 改为   
105static void *thread_function(void *arg); 就可以了   
106\---------------------------------------------------------------   
107  
108因为pthread_create(）不是class test的成员函数也不是友元函数。当将class test的成员函数thread_function()以传址方式传递给pthread_create(）时，因为pthread_create(）无法直接访问class test成员函数，将会出现访问权限错误。加上static后，因为static以面向对象来理解，在某个class中以static修饰的成员都将作为类直接成员，即不再只是类实例（instance)成员处理，这时的类成员跟结构体(struct）中的成员非常相似，就可以以“类名::成员”的方式，以类似全局作用域的方式进行访问。因此就不会出现访问权限错误。</string.h></pthread.h></stdlib.h></unistd.h></stdio.h></pthread.h></stdlib.h></unistd.h></stdio.h>