Mercurial > cpython-lru_cache-weakref

annotate Modules/rotatingtree.c @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents fd25030223b0
children
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1 #include "rotatingtree.h"
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2
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3 #define KEY_LOWER_THAN(key1, key2) ((char*)(key1) < (char*)(key2))
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4
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5 /* The randombits() function below is a fast-and-dirty generator that
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6 * is probably irregular enough for our purposes. Note that it's biased:
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7 * I think that ones are slightly more probable than zeroes. It's not
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8 * important here, though.
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9 */
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10
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11 static unsigned int random_value = 1;
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12 static unsigned int random_stream = 0;
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13
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14 static int
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15 randombits(int bits)
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16 {
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17 int result;
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18 if (random_stream < (1U << bits)) {
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19 random_value *= 1082527;
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20 random_stream = random_value;
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21 }
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22 result = random_stream & ((1<<bits)-1);
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23 random_stream >>= bits;
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24 return result;
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25 }
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26
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27
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28 /* Insert a new node into the tree.
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29 (*root) is modified to point to the new root. */
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30 void
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31 RotatingTree_Add(rotating_node_t **root, rotating_node_t *node)
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32 {
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33 while (*root != NULL) {
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34 if (KEY_LOWER_THAN(node->key, (*root)->key))
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35 root = &((*root)->left);
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36 else
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37 root = &((*root)->right);
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38 }
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39 node->left = NULL;
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40 node->right = NULL;
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41 *root = node;
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42 }
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43
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44 /* Locate the node with the given key. This is the most complicated
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45 function because it occasionally rebalances the tree to move the
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46 resulting node closer to the root. */
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47 rotating_node_t *
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48 RotatingTree_Get(rotating_node_t **root, void *key)
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49 {
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50 if (randombits(3) != 4) {
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51 /* Fast path, no rebalancing */
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52 rotating_node_t *node = *root;
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53 while (node != NULL) {
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54 if (node->key == key)
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55 return node;
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56 if (KEY_LOWER_THAN(key, node->key))
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57 node = node->left;
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58 else
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59 node = node->right;
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60 }
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61 return NULL;
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62 }
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63 else {
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64 rotating_node_t **pnode = root;
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65 rotating_node_t *node = *pnode;
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66 rotating_node_t *next;
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67 int rotate;
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68 if (node == NULL)
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69 return NULL;
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70 while (1) {
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71 if (node->key == key)
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72 return node;
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73 rotate = !randombits(1);
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74 if (KEY_LOWER_THAN(key, node->key)) {
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75 next = node->left;
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76 if (next == NULL)
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77 return NULL;
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78 if (rotate) {
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79 node->left = next->right;
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80 next->right = node;
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81 *pnode = next;
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82 }
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83 else
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84 pnode = &(node->left);
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85 }
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86 else {
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87 next = node->right;
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88 if (next == NULL)
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89 return NULL;
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90 if (rotate) {
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91 node->right = next->left;
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92 next->left = node;
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93 *pnode = next;
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94 }
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95 else
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96 pnode = &(node->right);
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97 }
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98 node = next;
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99 }
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100 }
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101 }
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102
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103 /* Enumerate all nodes in the tree. The callback enumfn() should return
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104 zero to continue the enumeration, or non-zero to interrupt it.
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105 A non-zero value is directly returned by RotatingTree_Enum(). */
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106 int
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107 RotatingTree_Enum(rotating_node_t *root, rotating_tree_enum_fn enumfn,
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108 void *arg)
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109 {
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110 int result;
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111 rotating_node_t *node;
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112 while (root != NULL) {
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113 result = RotatingTree_Enum(root->left, enumfn, arg);
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114 if (result != 0) return result;
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115 node = root->right;
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116 result = enumfn(root, arg);
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117 if (result != 0) return result;
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118 root = node;
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119 }
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120 return 0;
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121 }