| 1 | // $Id: dplayx_queue.h,v 1.2 2000-09-24 22:47:39 hugh Exp $
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| 2 | /* A queue definition based on sys/queue.h TAILQ definitions
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| 3 | *
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| 4 | * Blame any implementation mistakes on Peter Hunnisett
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| 5 | * <hunnise@nortelnetworks.com>
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| 6 | */
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| 7 |
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| 8 | #ifndef __WINE_DPLAYX_QUEUE_H
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| 9 | #define __WINE_DPLAYX_QUEUE_H
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| 10 |
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| 11 | #include "winbase.h"
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| 12 |
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| 13 | #define DPQ_INSERT(a,b,c) DPQ_INSERT_IN_TAIL(a,b,c)
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| 14 |
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| 15 | /*
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| 16 | * Tail queue definitions.
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| 17 | */
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| 18 | #define DPQ_HEAD(type) \
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| 19 | struct { \
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| 20 | struct type *lpQHFirst; /* first element */ \
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| 21 | struct type **lpQHLast; /* addr of last next element */ \
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| 22 | }
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| 23 |
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| 24 | #define DPQ_ENTRY(type) \
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| 25 | struct { \
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| 26 | struct type *lpQNext; /* next element */ \
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| 27 | struct type **lpQPrev; /* address of previous next element */ \
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| 28 | }
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| 29 |
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| 30 | /*
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| 31 | * Tail queue functions.
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| 32 | */
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| 33 | #define DPQ_INIT(head) \
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| 34 | do{ \
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| 35 | (head).lpQHFirst = NULL; \
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| 36 | (head).lpQHLast = &(head).lpQHFirst; \
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| 37 | } while(0)
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| 38 |
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| 39 | /* Front of the queue */
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| 40 | #define DPQ_FIRST( head ) ( (head).lpQHFirst )
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| 41 |
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| 42 | /* Check if the queue has any elements */
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| 43 | #define DPQ_IS_EMPTY( head ) ( DPQ_FIRST(head) == NULL )
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| 44 |
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| 45 | /* Next entry -- FIXME: Convert everything over to this macro ... */
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| 46 | #define DPQ_NEXT( elem ) (elem).lpQNext
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| 47 |
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| 48 | #define DPQ_IS_ENDOFLIST( elem ) \
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| 49 | ( DPQ_NEXT(elem) == NULL )
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| 50 |
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| 51 | /* Insert element at end of queue */
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| 52 | #define DPQ_INSERT_IN_TAIL(head, elm, field) \
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| 53 | do { \
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| 54 | (elm)->field.lpQNext = NULL; \
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| 55 | (elm)->field.lpQPrev = (head).lpQHLast; \
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| 56 | *(head).lpQHLast = (elm); \
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| 57 | (head).lpQHLast = &(elm)->field.lpQNext; \
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| 58 | } while(0)
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| 59 |
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| 60 | /* Remove element from the queue */
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| 61 | #define DPQ_REMOVE(head, elm, field) \
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| 62 | do { \
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| 63 | if (((elm)->field.lpQNext) != NULL) \
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| 64 | (elm)->field.lpQNext->field.lpQPrev = \
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| 65 | (elm)->field.lpQPrev; \
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| 66 | else \
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| 67 | (head).lpQHLast = (elm)->field.lpQPrev; \
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| 68 | *(elm)->field.lpQPrev = (elm)->field.lpQNext; \
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| 69 | } while(0)
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| 70 |
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| 71 | /* head - pointer to DPQ_HEAD struct
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| 72 | * elm - how to find the next element
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| 73 | * field - to be concatenated to rc to compare with fieldToCompare
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| 74 | * fieldToCompare - The value that we're comparing against
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| 75 | * fieldCompareOperator - The logical operator to compare field and
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| 76 | * fieldToCompare.
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| 77 | * rc - Variable to put the return code. Same type as (head).lpQHFirst
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| 78 | */
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| 79 | #define DPQ_FIND_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc )\
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| 80 | do { \
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| 81 | (rc) = (head).lpQHFirst; /* NULL head? */ \
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| 82 | \
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| 83 | while( rc ) \
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| 84 | { \
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| 85 | /* What we're searching for? */ \
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| 86 | if( (rc)->field fieldCompareOperator (fieldToCompare) ) \
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| 87 | { \
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| 88 | break; /* rc == correct element */ \
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| 89 | } \
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| 90 | \
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| 91 | /* End of list check */ \
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| 92 | if( ( (rc) = (rc)->elm.lpQNext ) == (head).lpQHFirst ) \
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| 93 | { \
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| 94 | rc = NULL; \
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| 95 | break; \
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| 96 | } \
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| 97 | } \
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| 98 | } while(0)
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| 99 |
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| 100 | /* head - pointer to DPQ_HEAD struct
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| 101 | * elm - how to find the next element
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| 102 | * field - to be concatenated to rc to compare with fieldToEqual
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| 103 | * fieldToCompare - The value that we're comparing against
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| 104 | * fieldCompareOperator - The logical operator to compare field and
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| 105 | * fieldToCompare.
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| 106 | * rc - Variable to put the return code. Same type as (head).lpQHFirst
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| 107 | */
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| 108 | #define DPQ_REMOVE_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc )\
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| 109 | do { \
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| 110 | DPQ_FIND_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc );\
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| 111 | \
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| 112 | /* Was the element found? */ \
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| 113 | if( rc ) \
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| 114 | { \
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| 115 | DPQ_REMOVE( head, rc, elm ); \
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| 116 | } \
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| 117 | } while(0)
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| 118 |
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| 119 | /* Delete the entire queue
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| 120 | * head - pointer to the head of the queue
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| 121 | * field - field to access the next elements of the queue
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| 122 | * type - type of the pointer to the element element
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| 123 | * df - a delete function to be called. Declared with DPQ_DECL_DELETECB.
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| 124 | */
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| 125 | #define DPQ_DELETEQ( head, field, type, df ) \
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| 126 | while( !DPQ_IS_EMPTY(head) ) \
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| 127 | { \
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| 128 | type holder = (head).lpQHFirst; \
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| 129 | DPQ_REMOVE( head, holder, field ); \
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| 130 | df( holder ); \
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| 131 | }
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| 132 |
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| 133 | /* How to define the method to be passed to DPQ_DELETEQ */
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| 134 | #define DPQ_DECL_DELETECB( name, type ) void name( type elem )
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| 135 |
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| 136 | /* Prototype of a method which just performs a HeapFree on the elem */
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| 137 | DPQ_DECL_DELETECB( cbDeleteElemFromHeap, LPVOID );
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| 138 |
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| 139 | #endif /* __WINE_DPLAYX_QUEUE_H */
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