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annotate lib/gl_anyavltree_list1.h @ 17363:5a51fb7777a9

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sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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1 /* Sequential list data type implemented by a binary tree.
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2 Copyright (C) 2006, 2009-2013 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2006.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Common code of gl_avltree_list.c and gl_avltreehash_list.c. */
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19
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20 /* An AVL tree is a binary tree where
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21 1. The height of each node is calculated as
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22 heightof(node) = 1 + max (heightof(node.left), heightof(node.right)).
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23 2. The heights of the subtrees of each node differ by at most 1:
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24 | heightof(right) - heightof(left) | <= 1.
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25 3. The index of the elements in the node.left subtree are smaller than
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26 the index of node.
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27 The index of the elements in the node.right subtree are larger than
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28 the index of node.
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29 */
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30
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31 /* -------------------------- gl_list_t Data Type -------------------------- */
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32
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33 /* Concrete list node implementation, valid for this file only. */
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34 struct gl_list_node_impl
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35 {
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36 #if WITH_HASHTABLE
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37 struct gl_hash_entry h; /* hash table entry fields; must be first */
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38 #endif
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39 struct gl_list_node_impl *left; /* left branch, or NULL */
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40 struct gl_list_node_impl *right; /* right branch, or NULL */
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41 /* Parent pointer, or NULL. The parent pointer is not needed for most
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42 operations. It is needed so that a gl_list_node_t can be returned
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43 without memory allocation, on which the functions gl_list_remove_node,
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44 gl_list_add_before, gl_list_add_after can be implemented. */
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45 struct gl_list_node_impl *parent;
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46 int balance; /* heightof(right) - heightof(left),
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47 always = -1 or 0 or 1 */
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48 size_t branch_size; /* number of nodes in this branch,
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49 = branchsize(left)+branchsize(right)+1 */
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50 const void *value;
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51 };
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52
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53 /* Concrete gl_list_impl type, valid for this file only. */
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54 struct gl_list_impl
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55 {
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56 struct gl_list_impl_base base;
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57 #if WITH_HASHTABLE
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58 /* A hash table: managed as an array of collision lists. */
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59 struct gl_hash_entry **table;
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60 size_t table_size;
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61 #endif
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62 struct gl_list_node_impl *root; /* root node or NULL */
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63 };
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64
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65 /* An AVL tree of height h has at least F_(h+2) [Fibonacci number] and at most
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66 2^h - 1 elements. So, h <= 84 (because a tree of height h >= 85 would have
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67 at least F_87 elements, and because even on 64-bit machines,
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68 sizeof (gl_list_node_impl) * F_87 > 2^64
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69 this would exceed the address space of the machine. */
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70 #define MAXHEIGHT 83