Linux API for Semaphores

• Semget
  • To get an array of semaphores
• Semctl
  • Semaphore controls. For example initial value
• Semop
  • Semaphore Operations (lock, signal etc.)

Pthread Mutex Locks

• Data Types: pthread_mutex_t
• Creation: pthread_mutex_init
• Lock: pthread_mutex_lock
• Unlock: pthread_mutex_unlock
  pthread_mutex_t mutex;
  pthread_mutex_init(&mutex, NULL);
  pthread_mutex_lock(&mutex);
  pthread_mutex_unlock(&mutex);

Win32 Mutex Locks and Semaphores

• Declaration
  • HANDLE mutex; (or HANDLE semaphore);
• Creation
  • CreateMutex: To create a mutex lock
  • CreateSemaphore: To create a semaphore
    • semaphore = CreateSemaphore(NULL, 1, 5, NULL);
• Wait for mutex or semaphore
  • WaitForSingleObject(HANDLE, WAITTYPE)
    • WaitForSingleObject(Sem, INFINITE);
• Releasing
  • ReleaseMutex(mutex)
  • ReleaseSemaphore(sem, 1, NULL)