Resource.hh

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#ifndef COSA_RESOURCE_HH
#define COSA_RESOURCE_HH

#include "Cosa/Types.h"

class Resource {
public:
  Resource() :
    m_busy(false)
  {}

  void acquire()
  {
    uint8_t key = lock(m_busy);
    on_acquire();
    unlock(key);
  }

  bool try_acquire()
  {
    synchronized {
      if (m_busy) return (false);
      m_busy = true;
      on_acquire();
    }
  }

  void release()
  {
    synchronized {
      on_release();
      m_busy = false;
    }
  }

protected:
  virtual void on_acquire() = 0;

  virtual void on_release() = 0;

private:
  volatile bool m_busy;
};
#endif