a083f8cc77
Since the kernel modules are moved to kernel/ directory, there is no need anymore for the sub-directory eal/ in linux/, freebsd/ and windows/. Signed-off-by: Thomas Monjalon <thomas@monjalon.net> Acked-by: David Marchand <david.marchand@redhat.com>
303 lines
8.9 KiB
C++
303 lines
8.9 KiB
C++
/* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*/
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#ifndef _SYS_QUEUE_H_
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#define _SYS_QUEUE_H_
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/*
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* This file defines tail queues.
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*
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* A tail queue is headed by a pair of pointers, one to the head of the
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* list and the other to the tail of the list. The elements are doubly
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* linked so that an arbitrary element can be removed without a need to
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* traverse the list. New elements can be added to the list before or
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* after an existing element, at the head of the list, or at the end of
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* the list. A tail queue may be traversed in either direction.
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*
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* Below is a summary of implemented functions where:
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* + means the macro is available
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* - means the macro is not available
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* s means the macro is available but is slow (runs in O(n) time)
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*
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* TAILQ
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* _HEAD +
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* _CLASS_HEAD +
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* _HEAD_INITIALIZER +
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* _ENTRY +
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* _CLASS_ENTRY +
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* _INIT +
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* _EMPTY +
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* _FIRST +
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* _NEXT +
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* _PREV +
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* _LAST +
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* _LAST_FAST +
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* _FOREACH +
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* _FOREACH_FROM +
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* _FOREACH_SAFE +
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* _FOREACH_FROM_SAFE +
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* _FOREACH_REVERSE +
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* _FOREACH_REVERSE_FROM +
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* _FOREACH_REVERSE_SAFE +
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* _FOREACH_REVERSE_FROM_SAFE +
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* _INSERT_HEAD +
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* _INSERT_BEFORE +
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* _INSERT_AFTER +
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* _INSERT_TAIL +
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* _CONCAT +
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* _REMOVE_AFTER -
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* _REMOVE_HEAD -
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* _REMOVE +
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* _SWAP +
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*
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* List definitions.
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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 QMD_TRACE_ELEM(elem)
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#define QMD_TRACE_HEAD(head)
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#define TRACEBUF
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#define TRACEBUF_INITIALIZER
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#define TRASHIT(x)
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#define QMD_IS_TRASHED(x) 0
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#define QMD_SAVELINK(name, link)
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#ifdef __cplusplus
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/*
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* In C++ there can be structure lists and class lists:
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*/
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#define QUEUE_TYPEOF(type) type
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#else
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#define QUEUE_TYPEOF(type) struct type
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#endif
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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_CLASS_HEAD(name, type) \
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struct name { \
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class type *tqh_first; /* first element */ \
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class 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, TRACEBUF_INITIALIZER }
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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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#define TAILQ_CLASS_ENTRY(type) \
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struct { \
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class type *tqe_next; /* next element */ \
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class 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 QMD_TAILQ_CHECK_HEAD(head, field)
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#define QMD_TAILQ_CHECK_TAIL(head, headname)
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#define QMD_TAILQ_CHECK_NEXT(elm, field)
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#define QMD_TAILQ_CHECK_PREV(elm, field)
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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(head1); \
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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_FROM(var, head, field) \
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for ((var) = ((var) ? (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_FROM_SAFE(var, head, field, tvar) \
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for ((var) = ((var) ? (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_FROM(var, head, headname, field) \
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for ((var) = ((var) ? (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_FOREACH_REVERSE_FROM_SAFE(var, head, headname, field, tvar) \
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for ((var) = ((var) ? (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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QMD_TAILQ_CHECK_NEXT(listelm, field); \
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TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field); \
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if (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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QMD_TAILQ_CHECK_PREV(listelm, field); \
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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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QMD_TAILQ_CHECK_HEAD(head, field); \
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TAILQ_NEXT((elm), field) = TAILQ_FIRST((head)); \
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if (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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QMD_TAILQ_CHECK_TAIL(head, field); \
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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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/*
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* The FAST function is fast in that it causes no data access other
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* then the access to the head. The standard LAST function above
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* will cause a data access of both the element you want and
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* the previous element. FAST is very useful for instances when
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* you may want to prefetch the last data element.
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*/
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#define TAILQ_LAST_FAST(head, type, field) \
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(TAILQ_EMPTY(head) ? NULL : __containerof((head)->tqh_last, \
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QUEUE_TYPEOF(type), field.tqe_next))
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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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QMD_SAVELINK(oldnext, (elm)->field.tqe_next); \
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QMD_SAVELINK(oldprev, (elm)->field.tqe_prev); \
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QMD_TAILQ_CHECK_NEXT(elm, field); \
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QMD_TAILQ_CHECK_PREV(elm, field); \
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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(*oldnext); \
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TRASHIT(*oldprev); \
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QMD_TRACE_ELEM(&(elm)->field); \
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} while (0)
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#define TAILQ_SWAP(head1, head2, type, field) do { \
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QUEUE_TYPEOF(type) * swap_first = (head1)->tqh_first; \
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QUEUE_TYPEOF(type) * *swap_last = (head1)->tqh_last; \
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(head1)->tqh_first = (head2)->tqh_first; \
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(head1)->tqh_last = (head2)->tqh_last; \
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(head2)->tqh_first = swap_first; \
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(head2)->tqh_last = swap_last; \
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swap_first = (head1)->tqh_first; \
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if (swap_first != NULL) \
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swap_first->field.tqe_prev = &(head1)->tqh_first; \
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else \
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(head1)->tqh_last = &(head1)->tqh_first; \
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swap_first = (head2)->tqh_first; \
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if (swap_first != NULL) \
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swap_first->field.tqe_prev = &(head2)->tqh_first; \
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else \
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(head2)->tqh_last = &(head2)->tqh_first; \
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} while (0)
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_QUEUE_H_ */
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