66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* Copyright (c) 2020 YuQing <384681@qq.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the Lesser GNU General Public License, version 3
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* or later ("LGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the Lesser GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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//skiplist_common.h
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#ifndef _SKIPLIST_COMMON_H
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#define _SKIPLIST_COMMON_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "common_define.h"
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#define SKIPLIST_MAX_LEVEL_COUNT 30
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#define SKIPLIST_DEFAULT_MIN_ALLOC_ELEMENTS_ONCE 64
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typedef int (*skiplist_compare_func)(const void *p1, const void *p2);
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typedef void (*skiplist_free_func)(void *ptr);
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static inline int skiplist_get_proper_level(const int target_count)
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{
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if (target_count < 8) {
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return 2;
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} else if (target_count < 64) {
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return 4;
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} else if (target_count < 256) {
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return 6;
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} else if (target_count < 1024) {
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return 8;
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} else if (target_count < 4096) {
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return 10;
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} else if (target_count < 16 * 1024) {
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return 12;
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} else if (target_count < 64 * 1024) {
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return 14;
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} else if (target_count < 256 * 1024) {
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return 16;
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} else if (target_count < 1024 * 1024) {
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return 18;
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} else {
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return 20;
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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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#ifdef __cplusplus
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}
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#endif
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#endif
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