多线程初步练习

xby@BI01:~/debug/sy> gcc -o tth tth.c -lpthreadtth.c: In function 'main':tth.c:21: warning: incompatible implicit declaration of built-in function 'exit'xby@BI01:~/debug/sy> ./tththis is mainhhohowhow how yhow yohow youhow you how you dhow you dohow you doihow you doinhow you doingxby@BI01:~/debug/sy> cat tth.c#include <pthread.h>#include <stdio.h>#include <unistd.h>char str[64] = {0};char tmp[64] = "how you doing";void thread(){ int i = 0; for (i = 0; i < 13; i++){str = tmp;sleep(1);}}int main(){pthread_t id;int i, ret;ret = pthread_create(&id, NULL, (void *)thread, NULL);if (ret != 0){printf("error");exit(1);}printf("this is main/n");for(i = 0; i < 13; i++){sleep(1);printf("%s/n", str);}pthread_join(id, NULL);return 0;}