？？

#include
#include
#include
void *myThread1(void) {
    int i;
    for(i = 0; i < 100; ++i) {
    printf("This is the 1st pthread created.\n");
    sleep(1);
    }
}
void *myThread2(void) {
    int i;
    for(i = 0; i < 100; ++i) {
    printf("This is the 2nd pthread created.\n");
    sleep(1);
    }
}
int main() {
    int i = 0, ret = 0;
    pthread_t id1, id2;
    ret = pthread_create(&id1, NULL, (void*)myThread1, NULL);
    if(ret) {
    printf("Create pthread error!\n");
    return 1;
    }
    ret = pthread_create(&id2, NULL, (void*)myThread2, NULL);
    if(ret) {
    printf("Create pthread error!\n");
    return 1;
    }
    pthread_join(id1, NULL);
    pthread_join(id2, NULL);
    return 0;
}