linux/include/linux/klist.h
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   1/*
   2 *      klist.h - Some generic list helpers, extending struct list_head a bit.
   3 *
   4 *      Implementations are found in lib/klist.c
   5 *
   6 *
   7 *      Copyright (C) 2005 Patrick Mochel
   8 *
   9 *      This file is rleased under the GPL v2.
  10 */
  11
  12#ifndef _LINUX_KLIST_H
  13#define _LINUX_KLIST_H
  14
  15#include <linux/spinlock.h>
  16#include <linux/kref.h>
  17#include <linux/list.h>
  18
  19struct klist_node;
  20struct klist {
  21        spinlock_t              k_lock;
  22        struct list_head        k_list;
  23        void                    (*get)(struct klist_node *);
  24        void                    (*put)(struct klist_node *);
  25} __attribute__ ((aligned (sizeof(void *))));
  26
  27#define KLIST_INIT(_name, _get, _put)                                   \
  28        { .k_lock       = __SPIN_LOCK_UNLOCKED(_name.k_lock),           \
  29          .k_list       = LIST_HEAD_INIT(_name.k_list),                 \
  30          .get          = _get,                                         \
  31          .put          = _put, }
  32
  33#define DEFINE_KLIST(_name, _get, _put)                                 \
  34        struct klist _name = KLIST_INIT(_name, _get, _put)
  35
  36extern void klist_init(struct klist *k, void (*get)(struct klist_node *),
  37                       void (*put)(struct klist_node *));
  38
  39struct klist_node {
  40        void                    *n_klist;       /* never access directly */
  41        struct list_head        n_node;
  42        struct kref             n_ref;
  43};
  44
  45extern void klist_add_tail(struct klist_node *n, struct klist *k);
  46extern void klist_add_head(struct klist_node *n, struct klist *k);
  47extern void klist_add_after(struct klist_node *n, struct klist_node *pos);
  48extern void klist_add_before(struct klist_node *n, struct klist_node *pos);
  49
  50extern void klist_del(struct klist_node *n);
  51extern void klist_remove(struct klist_node *n);
  52
  53extern int klist_node_attached(struct klist_node *n);
  54
  55
  56struct klist_iter {
  57        struct klist            *i_klist;
  58        struct klist_node       *i_cur;
  59};
  60
  61
  62extern void klist_iter_init(struct klist *k, struct klist_iter *i);
  63extern void klist_iter_init_node(struct klist *k, struct klist_iter *i,
  64                                 struct klist_node *n);
  65extern void klist_iter_exit(struct klist_iter *i);
  66extern struct klist_node *klist_next(struct klist_iter *i);
  67
  68#endif
  69
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