Semaphore.h

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// Copyright (c) Fraunhofer MEVIS, Germany. All rights reserved.
// **InsertLicense** code
 
#pragma once
 
#include <asio/System.h>
 
#include <FMEThirdPartyWarningsDisable.h>
#include <cstddef>
#include <mutex>
#include <condition_variable>
#include <FMEThirdPartyWarningsRestore.h>
 
 
namespace asio {
 
  class ASYNCHRONOUSIO_EXPORT Semaphore final
  {
  public:
 
    Semaphore();
    Semaphore(const Semaphore&) = default;
    Semaphore& operator=(const Semaphore&) = default;
    ~Semaphore();
 
    void increment();
 
    void decrement();
 
  private:
 
    std::size_t count;
    std::mutex mutex;
    std::condition_variable is_zero;
  };
 
 
  class ASYNCHRONOUSIO_EXPORT ScopedSemaphoreAccess final
  {
  public:
    
    ScopedSemaphoreAccess(Semaphore& semaphore);
    ScopedSemaphoreAccess(const ScopedSemaphoreAccess& other);
    ScopedSemaphoreAccess& operator=(const ScopedSemaphoreAccess&) = default;
    ~ScopedSemaphoreAccess();
 
  private:
 
    Semaphore* semaphore;
  };
 
}