Multithreading

#include <stdio.h>                /* standard I/O routines */
#include <pthread.h>        /* pthread functions and data structures */
#include <unistd.h>

                                            /* function to be executed by the new thread */
void*
do_loop(void* data)
{
int i;                                                       /* counter, to print numbers */
int j;                                                      /* counter, for delay */
int me = *((int*)data);                     /* thread identifying number */
printf("I am %d, mypid is %d\n", me, getpid());
for (i=0; i<10; i++) 
{
for (j=0; j<500000; j++)            /* delay loop */;
printf("'%d' - Got '%d'\n", me, i);
}
                                                      /* exit the thread */
pthread_exit(NULL);}
/* like any C program, program's execution begins in main */
intmain(int argc, char* argv[])
{int thr_id;                     /* thread ID for the newly created thread */
pthread_t p_thread; /* thread's structure */
int a = 1;                     /* thread 1 identifying number */
int b = 2;                  /* thread 2 identifying number */
int c = 3;                 /* thread 2 identifying number */
                               /* create a new thread that will execute 'do_loop()' */
thr_id = pthread_create(&p_thread, NULL, do_loop, (void*)&a);thr_id = pthread_create(&p_thread, NULL, do_loop, (void*)&b);

                       /* run 'do_loop()' in the main thread as well */do_loop((void*)&c);
                     /* NOT REACHED */return 0;
}