多线程

 1 #include <stdio.h>  2 #include <pthread.h>  3   4 void* say_hello(void* args) {  5     printf("hello from thread!\n");  6     pthread_exit((void*)1);  7     return (void*) 1;  8 }  9 int main() { 10     pthread_t tid; 11     int iRet = pthread_create(&tid,NULL,say_hello,NULL); 12     if (iRet) { 13         printf("creat error:iRet = %d\n", iRet); 14         return iRet; 15     } 16     void *retval; 17     iRet = pthread_join(tid, &retval); 18     if (iRet) { 19         printf("join error: iRet = %d\n", iRet); 20         return iRet; 21     } 22     printf("retval = %d\n", (long)retval); 23     return 0; 24 }