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thread problem [復(fù)制鏈接]

zhuizhuziwo

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發(fā)表于 2010-12-04 13:41 |只看該作者 |倒序瀏覽

本帖最后由 zhuizhuziwo 于 2010-12-04 14:15 編輯

what a fucking day.there is no chinese in this system.so i use english. sorry.

I have written a program with two threads. but it has some errors.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <semaphore.h>
#define MAX_LINE_LEN 256
//the second thread.
void * FirstThread(void *arg)
{
printf("Thread: %s\n", (char *)arg);
//return EXIT_SUCCESS;
return EXIT_FAILURE;
//exit(EXIT_SUCCESS); //if this thread end with this ,there is no problem.
}
//main thread.
int main()
{
pthread_t ptd;
int rst;
char str[MAX_LINE_LEN];
printf("Input string<short<255>:");
scanf("%s", str);
rst = pthread_create(&ptd, NULL, FirstThread, (void *)str);
if(rst != 0)
{
//perror("create thread error int %s, %d",__FILE__, __LINE__);
exit (EXIT_FAILURE);
}
void *p_thrdRst;
rst = pthread_join(ptd, &p_thrdRst);
if(rst != 0) //last time i forgot this line.
{
perror("Error join.\n");
exit (EXIT_FAILURE);
}
printf("Exit success\n");
printf("Return string:%s\n", (char *)p_thrdRst);
return EXIT_SUCCESS;
}

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the print out has an addtional string: ": Success", i dont know why?
i run it like this.

Input string<short<255>:whdllo
Thread: whdllo
Error join.
: Success //Why??? it seems the perror calls print this message.