/// @copyright 2020 ECCI, Universidad de Costa Rica. All rights reserved
/// This code is released under the GNU Public License version 3
/// @author Jeisson Hidalgo-Céspedes <jeisson.hidalgo@ucr.ac.cr>

#ifndef SEMAPHORE_HPP
#define SEMAPHORE_HPP

#include <semaphore.h>

#include "common.hpp"

/// Wrapper class for POSIX semaphores
class Semaphore {
  DISABLE_COPY(Semaphore);

 private:
  /// A thread-safe integer value
  sem_t semaphore;

 public:
  /// Constructs a semaphore with the given value
  explicit Semaphore(unsigned value);
  /// Destructor
  ~Semaphore();
  /// Increment the semaphore and wake a waiting thread if any
  void signal();
  /// Decrement the semaphore and block if the result is negative
  void wait();
};

#endif  // SEMAPHORE_HPP