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76 lines
2.0 KiB
76 lines
2.0 KiB
/*
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*
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* NOTES:
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*
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* ProtectedList:
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*
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* Wraps the List class with a mutex lock. Each public method is
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* protected first by accessing the mutex. The entire list can
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* be grabbed by using Access, ungrabbed by calling Release.
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* You would want to Access the list almost always when using it,
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* otherwise other threads could change the list without your
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* knowledge, exactly what this class is trying to prevent
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*
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* REVISIONS:
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* pcy29Nov92: Use PObj rather than PNode for return values
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* pcy21Apr93: OS2 FE merge
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* cad09Jul93: using new semaphores
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* cad31Aug93: removing compiler warnings
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* pcy08Apr94: Trim size, use static iterators, dead code removal
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* mwh05May94: #include file madness , part 2
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* mwh08Apr97: add Access,Release methods & NOTES section
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*/
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#ifndef _PROTLIST_H
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#define _PROTLIST_H
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#include "list.h"
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_CLASSDEF(ProtectedList)
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_CLASSDEF(MutexLock)
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class ProtectedList : public List {
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private:
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PMutexLock accessLock;
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protected:
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VOID Request() const;
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VOID Clear() const;
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public:
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ProtectedList ();
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ProtectedList(ProtectedList*);
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virtual ~ProtectedList();
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virtual VOID Add( RObj );
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virtual VOID Detach( RObj );
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virtual VOID Flush();
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virtual VOID FlushAll();
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virtual INT GetItemsInContainer() const;
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virtual RListIterator InitIterator() const;
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virtual VOID Append(PObj);
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virtual PObj GetHead();
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virtual PObj Find(PObj);
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//
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// Use Access to lock the entire list object
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// useful to block access completely to any other thread
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// while one thread uses the list - don't forget to
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// call Release when you're done - NOTE: although it
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// is possible to still access this object w/o calling
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// Access first, all of the public calls are protected
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// by first trying to gain Access to the object first
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//
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VOID Access() const;
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//
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// Unlocks a list object that has been locked
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// by a thread
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//
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VOID Release() const;
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};
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#endif
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