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Posted 18 Jan 2003

Buffer Pool \ Object Pool

, 18 Jan 2003
An article on optimization of the use of dynamic memory.
#ifndef LINK_H
#define LINK_H
SLINK - single link

typedef struct _SLINK{
   _SLINK* _next;


//initialize the link 
//void SLINK_Initialize(PSLINK)
#define SLINK_Initialize(_head)           ((_head)->_next = NULL)

//check if list is empty
//bool SLINK_IsEmpty(PSLINK)
#define SLINK_IsEmpty(_head)              ((_head)->_next == NULL)

//pop the first item in list  
//PSLINK SLINK_Pop(PSLINK)                                              
#define SLINK_Pop(_head)                  (_head)->_next;\
                                          (_head)->_next =  (_head)->_next->_next;
//push an item to the head of list    
//VOID SLINK_Push(PSLINK,PSLINK)                                            
#define SLINK_Push(_head,_link)           (_link)->_next =  (_head)->_next;\
                                          (_head)->_next =  (_link)


DLINK - double link
typedef struct _DLINK{
   _DLINK* _prev;
   _DLINK* _next;

//initialize the link 
//void DLINK_Initialize(PDLINK)
#define DLINK_Initialize(_head)            ((_head)->_next = (_head)->_prev = (_head))

//check if list is empty
//bool DLINK_IsEmpty(PDLINK) 
#define DLINK_IsEmpty(_head)               ((_head)->_next == (_head))

//insert item after the _head item
//void DLINK_InsertNext(PDLINK,PDLINK)
#define DLINK_InsertNext(_head,_dlink)     (_dlink)->_next = (_head)->_next;\
                                           (_dlink)->_prev = (_head);\
                                           (_head)->_next->_prev = (_dlink);\
                                           (_head)->_next = (_dlink);
//insert item previous to the _head item         
//void DLINK_InsertPrev(PDLINK,PDLINK)                             
#define DLINK_InsertPrev(_head,_dlink)     (_dlink)->_prev = (_head)->_prev;\
                                           (_dlink)->_next = (_head);\
                                           (_head)->_prev->_next = (_dlink);\
                                           (_head)->_prev = (_dlink);
//remove the item from list
//void DLINK_Remove(PDLINK)
#define DLINK_Remove(_dlink)               (_dlink)->_prev->_next = (_dlink)->_next;\
                                           (_dlink)->_next->_prev = (_dlink)->_prev
//extract the item previous to _head
#define DLINK_ExtructPrev(_head)           (_head)->_prev;\
//extract the item after the _head item
#define DLINK_ExtructNext(_head)           (_head)->_next;\


//get the object of type "type" that contains the field "field" stating in address "address"

#define CONTAINING_RECORD(address, type, field) ((type *)( \
                                                 (PCHAR)(address) - \
                                                 (ULONG_PTR)(&((type *)0)->field)))

#endif // ALINK_H

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About the Author

Uri Twig
Web Developer
Israel Israel
4 years expirience coding C++ with MFC & STL and coding C for Windows XP/2K internals (Drivers).

I Love what I do.

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