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SharedQueue.h
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C/C++ Source or Header
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1990-05-19
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59 lines
#ifndef SHAREDQUEUE_H
#define SHAREDQUEUE_H
/*$Header: /afs/alw.nih.gov/unix/sun4_40c/usr/local/src/nihcl-3.0/share/lib/RCS/SharedQueue.h,v 3.0 90/05/20 00:21:23 kgorlen Rel $*/
/* SharedQueue.h -- declarations for shared queues
THIS SOFTWARE FITS THE DESCRIPTION IN THE U.S. COPYRIGHT ACT OF A
"UNITED STATES GOVERNMENT WORK". IT WAS WRITTEN AS A PART OF THE
AUTHOR'S OFFICIAL DUTIES AS A GOVERNMENT EMPLOYEE. THIS MEANS IT
CANNOT BE COPYRIGHTED. THIS SOFTWARE IS FREELY AVAILABLE TO THE
PUBLIC FOR USE WITHOUT A COPYRIGHT NOTICE, AND THERE ARE NO
RESTRICTIONS ON ITS USE, NOW OR SUBSEQUENTLY.
Author:
K. E. Gorlen
Computer Systems Laboratory, DCRT
National Institutes of Health
Bethesda, MD 20892
$Log: SharedQueue.h,v $
* Revision 3.0 90/05/20 00:21:23 kgorlen
* Release for 1st edition.
*
*/
#include "ArrayOb.h"
#include "Semaphore.h"
class SharedQueue: public VIRTUAL Object {
DECLARE_MEMBERS(SharedQueue);
ArrayOb queue;
int readPosition,writePosition;
Semaphore valueAvailable;
Semaphore spaceAvailable;
protected: // storer() functions for object I/O
virtual void storer(OIOofd&) const;
virtual void storer(OIOout&) const;
public:
SharedQueue(unsigned queueSize =Collection::DEFAULT_CAPACITY);
SharedQueue(const SharedQueue&);
bool isFull() const { return spaceAvailable.value() == 0; }
virtual unsigned capacity() const;
virtual Object* copy() const; // deepCopy()
virtual void deepenShallowCopy();
virtual void dumpOn(ostream& strm =cerr) const;
virtual unsigned hash() const;
virtual bool isEmpty() const;
virtual bool isEqual(const Object&) const;
virtual Object* next();
virtual Object* nextPut(Object&);
virtual void printOn(ostream& strm =cout) const;
virtual unsigned size() const;
private: // shouldNotImplement()
virtual int compare(const Object&) const;
};
#endif