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#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <semaphore.h>
/* Global variables */
int x = 0;
sem_t m;
/* Thread function */
void *thread(void *arg)
{
/* critical section */
sem_wait(&m);
x = x + 1;
sem_post(&m);

/* lock the mutex m */
/* unlock the mutex m */

}
void main ()
{
pthread_t tid[10];
int i;
/* semaphore m should be initialized by 1 */
if (sem_init(&m, 0, 1) == -1) {
perror("Could not initialize mylock semaphore");
exit(2);
}
/* create TEN threads */
for (i=0; i<10; i++)
{
if (pthread_create(&tid[i], NULL, thread, NULL) < 0) {
perror("Error: thread cannot be created");
exit(1);
}
}
/* wait for all created thread to terminate */
for (i=0; i<10; i++) pthread_join(tid[i], NULL);
printf("Final value of x is %d\n", x);
exit(0);
}