쓰레드 for문의 i값을 인자값으로 넘기기.....

 1 #include '<'stdio.h'>'
 2 #include '<'unistd.h'>'
  3 #include '<'pthread.h'>'
  4
  5
  6 void* do_loop(void *arg);
  7
  8 pthread_mutex_t mutx;
  9 int ncount;
 10
 11 int main(void){
 12
 13
 14         pthread_t t_id[3];
 15         void *status;
 16         int i;
 17
 18         if(pthread_mutex_init(&mutx, NULL) != 0){
 19                 perror("pthread_mutex_init() error ");
 20                 return 1;
 21         }
 22
 23         for(i=0; i<3; i++){
 24                 pthread_create(&t_id[i], NULL, do_loop, (void *)&i);
 25         }
 26
 27         for(i=0; i<3; i++){
 28                 pthread_join(t_id[i], &status);
 29         }
 30
 31         if(pthread_mutex_destroy(&mutx) != 0){
 32                 perror("pthread_mutex_destroy() error ");
 33                 return 1;
 34         }
 35
 36         fputs("programing is end \n", stdout);
 37
 38         return 0;
 39 }
 40
 41 void* do_loop(void *arg){
 42
 43         int i;
 44         int mydata;
 45         int id = *((int*)arg);
 46
 47
 48         for(i=0; i<10; i++){
 49         pthread_mutex_lock(&mutx);
 50                 printf("[%d]thread : %d\n", id, ncount);
 51                 mydata = ncount;
 52                 mydata++;
 53                 usleep(1000);
 54                 ncount = mydata;
 55         pthread_mutex_unlock(&mutx);
 56                 usleep(10);
 57         }
 58         return 0;
 59 }