semaphore

#include <stdio.h>     // printf(),
#include <stdlib.h>    // exit(), EXIT_SUCCESS
#include <pthread.h>   // pthread_create(), pthread_join()
#include <semaphore.h> // sem_init()

sem_t binSem;

void* helloWorld(void* arg);

int main() {
  // Result for System call
  int res = 0;
  int i= 0;

  // Initialize semaphore
  res = sem_init(&binSem, 0, 0);
  if (res) {
    printf("Semaphore initialization failed!!\n");
    exit(EXIT_FAILURE);
  }

  // Create thread
  pthread_t thdHelloWorld;
  res = pthread_create(&thdHelloWorld, NULL, helloWorld, NULL);
  if (res) {
    printf("Thread creation failed!!\n");
    exit(EXIT_FAILURE);
  }

  for ( i=1; i <  10; i++) {
    // Post semaphore
    sleep(1);

    sem_post(&binSem);
  }

  // Wait for thread synchronization
  void *threadResult;
  res = pthread_join(thdHelloWorld, &threadResult);
  if (res) {
    printf("Thread join failed!!\n");
    exit(EXIT_FAILURE);
  }

  exit(EXIT_SUCCESS);
}

void* helloWorld(void* arg) {
  while(1) {
    // Wait semaphore
    sem_wait(&binSem);
    printf("Hello World\n");
  }
}