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simple.sem.H

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00001 
00002 #ifndef SIMPLE_SEMAPHORE_H
00003 #define SIMPLE_SEMAPHORE_H
00004 
00005 class SimpleSemaphore
00006 {
00007  protected:
00008   int   _key;
00009   int   _valid;
00010 
00011  public:
00012   SimpleSemaphore( int key ) : _key(key), _valid(0) {}
00013 
00014   virtual int valid() const { return _valid; }
00015 
00016   // after constructing, these are the two methods that can change
00017   // the _valid flag to true.
00018   virtual int create() = 0;
00019   virtual int attach() = 0;
00020   virtual int remove() = 0;
00021 
00022   // once initialized, use these methods to lock & unlock the semaphore
00023   virtual int lock() = 0;
00024   virtual int unlock() = 0;
00025 
00026   virtual void print( int pause_flag = 1) {}
00027 };
00028 
00029 #endif
00030 

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