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simple.sem.H

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#ifndef SIMPLE_SEMAPHORE_H
#define SIMPLE_SEMAPHORE_H

class SimpleSemaphore
{
 protected:
  int   _key;
  int   _valid;

 public:
  SimpleSemaphore( int key ) : _key(key), _valid(0) {}

  virtual int valid() const { return _valid; }

  // after constructing, these are the two methods that can change
  // the _valid flag to true.
  virtual int create() = 0;
  virtual int attach() = 0;
  virtual int remove() = 0;

  // once initialized, use these methods to lock & unlock the semaphore
  virtual int lock() = 0;
  virtual int unlock() = 0;

  virtual void print( int pause_flag = 1) {}
};

#endif

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