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#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <semaphore.h>
#define MAX_PORTS 5
sem_t port_semaphore;
void* open_port(void* arg)
{
 if (sem_wait(&port_semaphore) == 0)
 {
  int thread_id = *((int*)arg);
  printf("Thread %d: Port is open.\n", thread_id);
  sleep(2);
  printf("Thread %d: Port is closed.\n", thread_id);
  sem_post(&port_semaphore);
 }
 else {
  printf("Thread %d: Could not open a port, semaphore wait failed.\n", *((int*)arg));
 }
 return NULL;
}
int main()
{
 int i=0;
 if (sem_init(&port_semaphore, 0, MAX_PORTS) != 0)
 {
  perror("Semaphore initialization failed");
  return -1;
 }
 pthread_t threads[10];
 int thread_ids[10];
 for (i = 0; i < 10; i++)
 {
  thread_ids[i] = i + 1;  // Assign thread ids starting from 1
  if (pthread_create(&threads[i], NULL, open_port, &thread_ids[i]) != 0)
  {
   perror("Thread creation failed");
   return -1;
  }
 }
 for (i = 0; i < 10; i++) {
 pthread_join(threads[i], NULL);
 }
 sem_destroy(&port_semaphore);
 return 0;
}