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Languguage OS 2
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Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO
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gnu
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nihcl-30.lha
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nihcl-3.0
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lib
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Semaphore.h
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C/C++ Source or Header
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1990-05-20
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2KB
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64 lines
#ifndef SEMAPHORE_H
#define SEMAPHORE_H
/*$Header: /afs/alw.nih.gov/unix/sun4_40c/usr/local/src/nihcl-3.0/share/lib/RCS/Semaphore.h,v 3.0 90/05/20 13:37:16 kgorlen Rel $*/
/* Semaphore.h -- declarations for Semaphore
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: Semaphore.h,v $
* Revision 3.0 90/05/20 13:37:16 kgorlen
* Release for 1st edition.
*
*/
#include "Object.h"
#include "LinkedList.h"
class Process;
class Semaphore: public VIRTUAL Object {
DECLARE_MEMBERS(Semaphore);
LinkedList waitList;
short count;
protected: // storer() functions for object I/O
virtual void storer(OIOofd&) const;
virtual void storer(OIOout&) const;
public:
Semaphore(int initialCount =0);
#ifndef BUG_TOOBIG
// yacc stack overflow
Semaphore(const Semaphore&);
#endif
~Semaphore();
virtual Object* copy() const; // deepCopy()
virtual void deepenShallowCopy();
virtual void dumpOn(ostream& strm =cerr) const;
virtual unsigned hash() const;
virtual bool includes(const Process&) const;
virtual bool isEqual(const Object& ob) const;
virtual void printOn(ostream& strm =cout) const;
virtual Process* remove(Process&);
virtual Process* removeFirst();
virtual Process* removeLast();
virtual void signal(unsigned n=1); // signal waiting process
virtual int value() const; // read semaphore value
virtual void wait(); // wait on semaphore
private: // shouldNotImplement()
virtual int compare(const Object&) const;
};
#endif