1 #include <stdio.h>
2 #include <unistd.h>
3 #include <stdlib.h>
4 #include <pthread.h>
5 
6 void *thread_function(void *arg); /* Pointer to function executed by each thread */
7 
8 int slow = 0;
9 
10 #define NUM 5
11 
12 int main() {
13     int res;
14     pthread_t threads[NUM];
15     void *thread_result;
16     int args[NUM];
17     int i;
18 
19     for (i = 0; i < NUM; i++)
20       {
21 	args[i] = i;
22 	res = pthread_create(&threads[i], NULL, thread_function, (void *)&args[i]);
23       }
24 
25     for (i = 0; i < NUM; i++)
26       res = pthread_join(threads[i], &thread_result);
27 
28     printf ("Done\n");
29 
30     if (slow)
31       sleep (4);
32 
33     exit(EXIT_SUCCESS);
34 }
35 
36 void *thread_function(void *arg) {
37     int my_number = *(int *)arg;
38     int rand_num;
39 
40     printf ("Print 1, thread %d\n", my_number);
41     sleep (1);
42 
43     if (slow)
44       {
45 	printf ("Print 2, thread %d\n", my_number);
46 	sleep (1);
47 	printf ("Print 3, thread %d\n", my_number);
48 	sleep (1);
49 	printf ("Print 4, thread %d\n", my_number);
50 	sleep (1);
51 	printf ("Print 5, thread %d\n", my_number);
52 	sleep (1);
53       }
54 
55     printf("Bye from %d\n", my_number);
56     pthread_exit(NULL);
57 }
58 
59