99 lines
4.2 KiB
C
99 lines
4.2 KiB
C
/* A queue definition based on sys/queue.h TAILQ definitions
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*
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* Blame any implementation mistakes on Peter Hunnisett
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* <hunnise@nortelnetworks.com>
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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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#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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#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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#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 fieldToEqual
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* fieldToEqual - The value that we're looking for
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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, fieldToEqual, rc ) \
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do { \
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(rc) = (head).lpQHFirst; /* 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 == (fieldToEqual) ) \
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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 fieldToEqual
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* fieldToEqual - The value that we're looking for
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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, fieldToEqual, rc ) \
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do { \
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DPQ_FIND_ENTRY( head, elm, field, fieldToEqual, 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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#endif /* __WINE_DPLAYX_QUEUE_H */
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