106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
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/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2013, 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_MULTILIST_H
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#define _SYS_MULTILIST_H
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef list_node_t multilist_node_t;
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typedef struct multilist multilist_t;
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typedef struct multilist_sublist multilist_sublist_t;
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typedef unsigned int multilist_sublist_index_func_t(multilist_t *, void *);
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struct multilist_sublist {
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/*
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* The mutex used internally to implement thread safe insertions
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* and removals to this individual sublist. It can also be locked
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* by a consumer using multilist_sublist_{lock,unlock}, which is
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* useful if a consumer needs to traverse the list in a thread
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* safe manner.
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*/
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kmutex_t mls_lock;
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/*
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* The actual list object containing all objects in this sublist.
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*/
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list_t mls_list;
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/*
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* Pad to cache line, in an effort to try and prevent cache line
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* contention.
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*/
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} ____cacheline_aligned;
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struct multilist {
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/*
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* This is used to get to the multilist_node_t structure given
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* the void *object contained on the list.
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*/
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size_t ml_offset;
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/*
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* The number of sublists used internally by this multilist.
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*/
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uint64_t ml_num_sublists;
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/*
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* The array of pointers to the actual sublists.
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*/
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multilist_sublist_t *ml_sublists;
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/*
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* Pointer to function which determines the sublist to use
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* when inserting and removing objects from this multilist.
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* Please see the comment above multilist_create for details.
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*/
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multilist_sublist_index_func_t *ml_index_func;
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};
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void multilist_destroy(multilist_t *);
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multilist_t *multilist_create(size_t, size_t, multilist_sublist_index_func_t *);
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void multilist_insert(multilist_t *, void *);
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void multilist_remove(multilist_t *, void *);
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int multilist_is_empty(multilist_t *);
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unsigned int multilist_get_num_sublists(multilist_t *);
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unsigned int multilist_get_random_index(multilist_t *);
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multilist_sublist_t *multilist_sublist_lock(multilist_t *, unsigned int);
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multilist_sublist_t *multilist_sublist_lock_obj(multilist_t *, void *);
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void multilist_sublist_unlock(multilist_sublist_t *);
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void multilist_sublist_insert_head(multilist_sublist_t *, void *);
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void multilist_sublist_insert_tail(multilist_sublist_t *, void *);
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void multilist_sublist_move_forward(multilist_sublist_t *mls, void *obj);
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void multilist_sublist_remove(multilist_sublist_t *, void *);
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void *multilist_sublist_head(multilist_sublist_t *);
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void *multilist_sublist_tail(multilist_sublist_t *);
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void *multilist_sublist_next(multilist_sublist_t *, void *);
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void *multilist_sublist_prev(multilist_sublist_t *, void *);
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void multilist_link_init(multilist_node_t *);
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int multilist_link_active(multilist_node_t *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_MULTILIST_H */
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