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208 lines
9.4 KiB
C
208 lines
9.4 KiB
C
/* A queue definition based on sys/queue.h TAILQ definitions
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*
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* Copyright 2000 Peter Hunnisett
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __WINE_DPLAYX_QUEUE_H
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#define __WINE_DPLAYX_QUEUE_H
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#include "winbase.h"
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#define DPQ_INSERT(a,b,c) DPQ_INSERT_IN_TAIL(a,b,c)
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/*
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* Tail queue definitions.
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*/
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#define DPQ_HEAD(type) \
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struct { \
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struct type *lpQHFirst; /* first element */ \
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struct type **lpQHLast; /* addr of last next element */ \
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}
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#define DPQ_ENTRY(type) \
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struct { \
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struct type *lpQNext; /* next element */ \
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struct type **lpQPrev; /* address of previous next element */ \
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}
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/*
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* Tail queue functions.
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*/
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#define DPQ_INIT(head) \
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do{ \
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(head).lpQHFirst = NULL; \
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(head).lpQHLast = &(head).lpQHFirst; \
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} while(0)
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/* Front of the queue */
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#define DPQ_FIRST( head ) ( (head).lpQHFirst )
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/* Check if the queue has any elements */
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#define DPQ_IS_EMPTY( head ) ( DPQ_FIRST(head) == NULL )
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/* Next entry -- FIXME: Convert everything over to this macro ... */
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#define DPQ_NEXT( elem ) (elem).lpQNext
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#define DPQ_IS_ENDOFLIST( elem ) \
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( DPQ_NEXT(elem) == NULL )
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/* Insert element at end of queue */
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#define DPQ_INSERT_IN_TAIL(head, elm, field) \
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do { \
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(elm)->field.lpQNext = NULL; \
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(elm)->field.lpQPrev = (head).lpQHLast; \
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*(head).lpQHLast = (elm); \
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(head).lpQHLast = &(elm)->field.lpQNext; \
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} while(0)
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/* Remove element from the queue */
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#define DPQ_REMOVE(head, elm, field) \
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do { \
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if (((elm)->field.lpQNext) != NULL) \
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(elm)->field.lpQNext->field.lpQPrev = \
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(elm)->field.lpQPrev; \
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else \
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(head).lpQHLast = (elm)->field.lpQPrev; \
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*(elm)->field.lpQPrev = (elm)->field.lpQNext; \
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} while(0)
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/* head - pointer to DPQ_HEAD struct
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* elm - how to find the next element
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* field - to be concatenated to rc to compare with fieldToCompare
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* fieldToCompare - The value that we're comparing against
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* fieldCompareOperator - The logical operator to compare field and
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* fieldToCompare.
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* rc - Variable to put the return code. Same type as (head).lpQHFirst
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*/
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#define DPQ_FIND_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc )\
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do { \
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(rc) = DPQ_FIRST(head); /* NULL head? */ \
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\
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while( rc ) \
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{ \
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/* What we're searching for? */ \
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if( (rc)->field fieldCompareOperator (fieldToCompare) ) \
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{ \
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break; /* rc == correct element */ \
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} \
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\
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/* End of list check */ \
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if( ( (rc) = (rc)->elm.lpQNext ) == (head).lpQHFirst ) \
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{ \
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rc = NULL; \
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break; \
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} \
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} \
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} while(0)
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/* head - pointer to DPQ_HEAD struct
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* elm - how to find the next element
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* field - to be concatenated to rc to compare with fieldToCompare
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* fieldToCompare - The value that we're comparing against
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* compare_cb - Callback to invoke to determine if comparision should continue.
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* Callback must be defined with DPQ_DECL_COMPARECB.
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* rc - Variable to put the return code. Same type as (head).lpQHFirst
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*/
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#define DPQ_FIND_ENTRY_CB( head, elm, field, compare_cb, fieldToCompare, rc )\
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do { \
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(rc) = DPQ_FIRST(head); /* NULL head? */ \
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\
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while( rc ) \
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{ \
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/* What we're searching for? */ \
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if( compare_cb( &((rc)->field), &(fieldToCompare) ) ) \
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{ \
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break; /* no more */ \
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} \
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\
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/* End of list check */ \
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if( ( (rc) = (rc)->elm.lpQNext ) == (head).lpQHFirst ) \
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{ \
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rc = NULL; \
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break; \
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} \
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} \
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} while(0)
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/* How to define the method to be passed to DPQ_DELETEQ */
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#define DPQ_DECL_COMPARECB( name, type ) BOOL name( const type* elem1, const type* elem2 )
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/* head - pointer to DPQ_HEAD struct
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* elm - how to find the next element
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* field - to be concatenated to rc to compare with fieldToEqual
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* fieldToCompare - The value that we're comparing against
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* fieldCompareOperator - The logical operator to compare field and
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* fieldToCompare.
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* rc - Variable to put the return code. Same type as (head).lpQHFirst
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*/
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#define DPQ_REMOVE_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc )\
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do { \
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DPQ_FIND_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc );\
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\
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/* Was the element found? */ \
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if( rc ) \
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{ \
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DPQ_REMOVE( head, rc, elm ); \
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} \
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} while(0)
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/* head - pointer to DPQ_HEAD struct
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* elm - how to find the next element
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* field - to be concatenated to rc to compare with fieldToCompare
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* fieldToCompare - The value that we're comparing against
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* compare_cb - Callback to invoke to determine if comparision should continue.
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* Callback must be defined with DPQ_DECL_COMPARECB.
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* rc - Variable to put the return code. Same type as (head).lpQHFirst
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*/
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#define DPQ_REMOVE_ENTRY_CB( head, elm, field, compare_cb, fieldToCompare, rc )\
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do { \
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DPQ_FIND_ENTRY_CB( head, elm, field, compare_cb, fieldToCompare, rc );\
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\
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/* Was the element found? */ \
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if( rc ) \
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{ \
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DPQ_REMOVE( head, rc, elm ); \
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} \
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} while(0)
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/* Delete the entire queue
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* head - pointer to the head of the queue
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* field - field to access the next elements of the queue
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* type - type of the pointer to the element element
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* df - a delete function to be called. Declared with DPQ_DECL_DELETECB.
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*/
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#define DPQ_DELETEQ( head, field, type, df ) \
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do \
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{ \
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while( !DPQ_IS_EMPTY(head) ) \
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{ \
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type holder = DPQ_FIRST(head); \
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DPQ_REMOVE( head, holder, field ); \
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df( holder ); \
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} \
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} while(0)
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/* How to define the method to be passed to DPQ_DELETEQ */
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#define DPQ_DECL_DELETECB( name, type ) void name( type elem )
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/* Prototype of a method which just performs a HeapFree on the elem */
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DPQ_DECL_DELETECB( cbDeleteElemFromHeap, LPVOID );
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#endif /* __WINE_DPLAYX_QUEUE_H */
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