Mutex.swift

class Mutex {
  private let _mutex = UnsafeMutablePointer<pthread_mutex_t>.alloc(1)

  init() {
    pthread_mutex_init(_mutex, nil)
  }

  func lock() -> Int32 {
    return pthread_mutex_lock(_mutex)
  }

  func unlock() -> Int32 {
    return pthread_mutex_unlock(_mutex)
  }

  func tryLock() -> Int32 {
    return pthread_mutex_trylock(_mutex)
  }

  deinit {
    pthread_mutex_destroy(_mutex)
    _mutex.dealloc(1)
  }
}