216 lines
6.4 KiB
C
216 lines
6.4 KiB
C
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#ifndef _SYS_QUEUE_H_
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#define _SYS_QUEUE_H_
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#define __offsetof(type, field) ((size_t)(&((type *)0)->field))
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#define __rangeof(type, start, end) \
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(__offsetof(type, end) - __offsetof(type, start))
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#define QMD_TRACE_ELEM(elem)
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#define QMD_TRACE_HEAD(head)
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#define TRACEBUF
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#define TRASHIT(x)
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/*
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* List declarations.
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*/
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#define LIST_HEAD(name, type) \
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struct name { \
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struct type *lh_first; /* first element */ \
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}
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#define LIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#define LIST_ENTRY(type) \
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struct { \
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struct type *le_next; /* next element */ \
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struct type **le_prev; /* address of previous next element */ \
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}
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/*
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* List functions.
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*/
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#define LIST_EMPTY(head) ((head)->lh_first == NULL)
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#define LIST_FIRST(head) ((head)->lh_first)
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#define LIST_FOREACH(var, head, field) \
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for ((var) = LIST_FIRST((head)); \
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(var); \
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(var) = LIST_NEXT((var), field))
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#define LIST_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = LIST_FIRST((head)); \
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(var) && ((tvar) = LIST_NEXT((var), field), 1); \
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(var) = (tvar))
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#define LIST_INIT(head) do { \
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LIST_FIRST((head)) = NULL; \
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} while (0)
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#define LIST_INSERT_AFTER(listelm, elm, field) do { \
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if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
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LIST_NEXT((listelm), field)->field.le_prev = \
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&LIST_NEXT((elm), field); \
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LIST_NEXT((listelm), field) = (elm); \
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(elm)->field.le_prev = &LIST_NEXT((listelm), field); \
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} while (0)
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#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
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(elm)->field.le_prev = (listelm)->field.le_prev; \
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LIST_NEXT((elm), field) = (listelm); \
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*(listelm)->field.le_prev = (elm); \
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(listelm)->field.le_prev = &LIST_NEXT((elm), field); \
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} while (0)
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#define LIST_INSERT_HEAD(head, elm, field) do { \
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if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \
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LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
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LIST_FIRST((head)) = (elm); \
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(elm)->field.le_prev = &LIST_FIRST((head)); \
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} while (0)
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#define LIST_NEXT(elm, field) ((elm)->field.le_next)
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#define LIST_REMOVE(elm, field) do { \
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if (LIST_NEXT((elm), field) != NULL) \
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LIST_NEXT((elm), field)->field.le_prev = \
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(elm)->field.le_prev; \
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*(elm)->field.le_prev = LIST_NEXT((elm), field); \
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} while (0)
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/*
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* Tail queue declarations.
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*/
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#define TAILQ_HEAD(name, type) \
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struct name { \
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struct type *tqh_first; /* first element */ \
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struct type **tqh_last; /* addr of last next element */ \
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TRACEBUF \
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}
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#define TAILQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).tqh_first }
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#define TAILQ_ENTRY(type) \
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struct { \
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struct type *tqe_next; /* next element */ \
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struct type **tqe_prev; /* address of previous next element */ \
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TRACEBUF \
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}
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/*
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* Tail queue functions.
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*/
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#define TAILQ_CONCAT(head1, head2, field) do { \
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if (!TAILQ_EMPTY(head2)) { \
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*(head1)->tqh_last = (head2)->tqh_first; \
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(head2)->tqh_first->field.tqe_prev = (head1)->tqh_last; \
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(head1)->tqh_last = (head2)->tqh_last; \
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TAILQ_INIT((head2)); \
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QMD_TRACE_HEAD(head); \
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QMD_TRACE_HEAD(head2); \
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} \
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} while (0)
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#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
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#define TAILQ_FIRST(head) ((head)->tqh_first)
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#define TAILQ_FOREACH(var, head, field) \
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for ((var) = TAILQ_FIRST((head)); \
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(var); \
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(var) = TAILQ_NEXT((var), field))
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#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = TAILQ_FIRST((head)); \
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(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
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(var) = (tvar))
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#define TAILQ_FOREACH_REVERSE(var, head, headname, field) \
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for ((var) = TAILQ_LAST((head), headname); \
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(var); \
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(var) = TAILQ_PREV((var), headname, field))
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#define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar) \
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for ((var) = TAILQ_LAST((head), headname); \
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(var) && ((tvar) = TAILQ_PREV((var), headname, field), 1); \
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(var) = (tvar))
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#define TAILQ_INIT(head) do { \
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TAILQ_FIRST((head)) = NULL; \
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(head)->tqh_last = &TAILQ_FIRST((head)); \
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QMD_TRACE_HEAD(head); \
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} while (0)
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#define TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \
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if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
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TAILQ_NEXT((elm), field)->field.tqe_prev = \
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&TAILQ_NEXT((elm), field); \
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else { \
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(head)->tqh_last = &TAILQ_NEXT((elm), field); \
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QMD_TRACE_HEAD(head); \
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} \
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TAILQ_NEXT((listelm), field) = (elm); \
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(elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field); \
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QMD_TRACE_ELEM(&(elm)->field); \
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QMD_TRACE_ELEM(&listelm->field); \
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} while (0)
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#define TAILQ_INSERT_BEFORE(listelm, elm, field) do { \
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(elm)->field.tqe_prev = (listelm)->field.tqe_prev; \
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TAILQ_NEXT((elm), field) = (listelm); \
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*(listelm)->field.tqe_prev = (elm); \
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(listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field); \
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QMD_TRACE_ELEM(&(elm)->field); \
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QMD_TRACE_ELEM(&listelm->field); \
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} while (0)
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#define TAILQ_INSERT_HEAD(head, elm, field) do { \
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if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL) \
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TAILQ_FIRST((head))->field.tqe_prev = \
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&TAILQ_NEXT((elm), field); \
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else \
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(head)->tqh_last = &TAILQ_NEXT((elm), field); \
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TAILQ_FIRST((head)) = (elm); \
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(elm)->field.tqe_prev = &TAILQ_FIRST((head)); \
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QMD_TRACE_HEAD(head); \
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QMD_TRACE_ELEM(&(elm)->field); \
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} while (0)
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#define TAILQ_INSERT_TAIL(head, elm, field) do { \
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TAILQ_NEXT((elm), field) = NULL; \
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(elm)->field.tqe_prev = (head)->tqh_last; \
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*(head)->tqh_last = (elm); \
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(head)->tqh_last = &TAILQ_NEXT((elm), field); \
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QMD_TRACE_HEAD(head); \
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QMD_TRACE_ELEM(&(elm)->field); \
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} while (0)
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#define TAILQ_LAST(head, headname) \
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(*(((struct headname *)((head)->tqh_last))->tqh_last))
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#define TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
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#define TAILQ_PREV(elm, headname, field) \
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(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
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#define TAILQ_REMOVE(head, elm, field) do { \
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if ((TAILQ_NEXT((elm), field)) != NULL) \
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TAILQ_NEXT((elm), field)->field.tqe_prev = \
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(elm)->field.tqe_prev; \
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else { \
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(head)->tqh_last = (elm)->field.tqe_prev; \
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QMD_TRACE_HEAD(head); \
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} \
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*(elm)->field.tqe_prev = TAILQ_NEXT((elm), field); \
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TRASHIT((elm)->field.tqe_next); \
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TRASHIT((elm)->field.tqe_prev); \
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QMD_TRACE_ELEM(&(elm)->field); \
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} while (0)
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#endif /* _SYS_QUEUE_H */
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