133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/**
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* Copyright 2024-present Gregory Burd <greg@burd.me> All rights reserved.
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*
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* Portions of this code are derived from work copyrighted by Jung-Sang Ahn
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* 2017-2024 Jung-Sang Ahn <jungsang.ahn@gmail.com> and made available under
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* the MIT License. (see: https://github.com/greensky00 Skiplist version:
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* 0.2.9)
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*
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* MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef SKIPLIST_H__
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#define SKIPLIST_H__ (1)
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#include <stddef.h>
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#include <stdint.h>
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#define SKIPLIST_MAX_LAYER (64)
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#define _STL_ATOMIC (1)
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#ifdef __APPLE__
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#define _STL_ATOMIC (1)
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#endif
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typedef struct _sl_node *atm_node_ptr;
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typedef uint8_t atm_bool;
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typedef uint8_t atm_uint8_t;
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typedef uint16_t atm_uint16_t;
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typedef uint32_t atm_uint32_t;
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _sl_node {
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atm_node_ptr *next;
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atm_bool is_fully_linked;
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atm_bool being_modified;
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atm_bool removed;
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uint8_t top_layer; /* 0: bottom */
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atm_uint16_t ref_count;
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atm_uint32_t accessing_next;
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} sl_node;
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/*
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* *a < *b : return neg
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* *a == *b : return 0
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* *a > *b : return pos
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*/
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typedef int sl_cmp_t(sl_node *a, sl_node *b, void *aux);
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typedef struct {
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size_t fanout;
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size_t maxLayer;
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void *aux;
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} sl_raw_config;
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typedef struct {
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sl_node head;
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sl_node tail;
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sl_cmp_t *cmp_func;
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void *aux;
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atm_uint32_t num_entries;
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atm_uint32_t *layer_entries;
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atm_uint8_t top_layer;
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uint8_t fanout;
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uint8_t max_layer;
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} sl_raw;
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#ifndef sl_get_entry
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#define sl_get_entry(ELEM, STRUCT, MEMBER) \
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((STRUCT *)((uint8_t *)(ELEM)-offsetof(STRUCT, MEMBER)))
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#endif
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void sl_init(sl_raw *slist, sl_cmp_t *cmp_func);
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void sl_free(sl_raw *slist);
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void sl_init_node(sl_node *node);
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void sl_free_node(sl_node *node);
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size_t sl_get_size(sl_raw *slist);
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sl_raw_config sl_get_default_config();
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sl_raw_config sl_get_config(sl_raw *slist);
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void sl_set_config(sl_raw *slist, sl_raw_config config);
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int sl_insert(sl_raw *slist, sl_node *node);
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int sl_insert_nodup(sl_raw *slist, sl_node *node);
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sl_node *sl_find(sl_raw *slist, sl_node *query);
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sl_node *sl_find_smaller_or_equal(sl_raw *slist, sl_node *query);
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sl_node *sl_find_greater_or_equal(sl_raw *slist, sl_node *query);
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int sl_erase_node_passive(sl_raw *slist, sl_node *node);
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int sl_erase_node(sl_raw *slist, sl_node *node);
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int sl_erase(sl_raw *slist, sl_node *query);
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int sl_is_valid_node(sl_node *node);
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int sl_is_safe_to_free(sl_node *node);
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void sl_wait_for_free(sl_node *node);
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void sl_grab_node(sl_node *node);
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void sl_release_node(sl_node *node);
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sl_node *sl_next(sl_raw *slist, sl_node *node);
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sl_node *sl_prev(sl_raw *slist, sl_node *node);
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sl_node *sl_begin(sl_raw *slist);
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sl_node *sl_end(sl_raw *slist);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SKIPLIST_H__ */
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