多线程例子一

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
/*
 * 
 */
static int run = 1;
static int retvalue ;
void *start_routine(void *arg){
    int *running =arg;
    printf("child thread is begining, the parameter is %s\n",*running);
    while(*running){
        printf("child thread is rnning\n");
        usleep(1);
    }
    printf("exitting..\n");
    
    retvalue = 8;
    pthread_exit((void*) &retvalue);
    
}
int main(void)
{
    pthread_t pt;
    int ret = -1;
    int times = 10;
    int i = 0;
    int *ret_join = NULL;
    ret = pthread_create(&pt,NULL,(void*)start_routine,&run);
    if(ret != 0){
        printf("failed to create phread\n");
        return 1;
    }
    
    //sleep(3);
    for(i=0;i<times;i++){
        printf("this is main thread\n");
        //sleep(3);
    }
    run = 0;
    pthread_join(pt,(void*)&ret_join);
    printf("the return value of thread: %d\n",*ret_join);
    
    return 0;
    
}

运行结果

this is main thread
this is main thread
child thread is begining, the parameter is (null)
exitting..
the return value of thread: 8