WIP
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@ -14,8 +14,8 @@
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// ---------------------------------------------------------------------------
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#define TEST_ARRAY_SIZE 10
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#define VALIDATE
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//define SNAPSHOTS
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//define TODO_RESTORE_SNAPSHOTS
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// define SNAPSHOTS
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// define TODO_RESTORE_SNAPSHOTS
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#define STABLE_SEED
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#define DOT
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@ -189,24 +189,24 @@ int __xorshift32_state = 0;
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static uint32_t
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xorshift32()
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{
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uint32_t x = __xorshift32_state;
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if (x == 0)
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x = 123456789;
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x ^= x << 13;
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x ^= x >> 17;
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x ^= x << 5;
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__xorshift32_state = x;
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return x;
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uint32_t x = __xorshift32_state;
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if (x == 0)
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x = 123456789;
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x ^= x << 13;
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x ^= x >> 17;
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x ^= x << 5;
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__xorshift32_state = x;
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return x;
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}
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static void
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xorshift32_seed()
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{
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// Seed the PRNG
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// Seed the PRNG
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#ifdef STABLE_SEED
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__xorshift32_state = 8675309;
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__xorshift32_state = 8675309;
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#else
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__xorshift32_state = (unsigned int)time(NULL) ^ getpid();
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__xorshift32_state = (unsigned int)time(NULL) ^ getpid();
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#endif
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}
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@ -358,7 +358,7 @@ main()
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rc = api_skip_put_ex(list, array[i], numeral);
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CHECK;
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#ifdef DOT
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sprintf(msg, "put key: %d value: %s", i, numeral);
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sprintf(msg, "put key: %d value: %s", array[i], numeral);
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api_skip_dot_ex(of, list, gen++, msg, sprintf_ex_node);
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#endif
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char *v = api_skip_get_ex(list, array[i]);
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@ -369,24 +369,38 @@ main()
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to_upper(upper_numeral);
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api_skip_set_ex(list, array[i], upper_numeral);
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CHECK;
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for (size_t j = 0; j < api_skip_length_ex(list); j++) {
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int n = xorshift32() % api_skip_length_ex(list);
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api_skip_contains_ex(list, n);
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CHECK;
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#if 0
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sprintf(msg, "locate key: %d", n);
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api_skip_dot_ex(of, list, gen++, msg, sprintf_ex_node);
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#endif
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}
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}
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numeral = int_to_roman_numeral(-1);
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api_skip_dup_ex(list, -1, numeral);
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CHECK;
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#ifdef DOT
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sprintf(msg, "put dup key: %d value: %s", i, numeral);
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sprintf(msg, "put dup key: %d value: %s", -1, numeral);
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api_skip_dot_ex(of, list, gen++, msg, sprintf_ex_node);
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#endif
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numeral = int_to_roman_numeral(1);
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api_skip_dup_ex(list, 1, numeral);
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CHECK;
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#ifdef DOT
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sprintf(msg, "put dup key: %d value: %s", i, numeral);
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sprintf(msg, "put dup key: %d value: %s", 1, numeral);
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api_skip_dot_ex(of, list, gen++, msg, sprintf_ex_node);
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#endif
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api_skip_del_ex(list, 0);
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CHECK;
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#ifdef DOT
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sprintf(msg, "deleted key: %d, value: %s", 0, numeral);
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api_skip_dot_ex(of, list, gen++, msg, sprintf_ex_node);
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#endif
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if (api_skip_get_ex(list, 0) != NULL)
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perror("found a deleted item!");
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api_skip_del_ex(list, 0);
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@ -400,11 +414,6 @@ main()
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api_skip_del_ex(list, key);
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CHECK;
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#ifdef DOT
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sprintf(msg, "deleted key: %d, value: %s", 0, numeral);
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api_skip_dot_ex(of, list, gen++, msg, sprintf_ex_node);
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#endif
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numeral = int_to_roman_numeral(-(TEST_ARRAY_SIZE));
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assert(strcmp(api_skip_pos_ex(list, SKIP_GTE, -(TEST_ARRAY_SIZE)-1)->value, numeral) == 0);
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free(numeral);
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89
include/sl.h
89
include/sl.h
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@ -61,7 +61,7 @@
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* A skip-list is a sorted list with O(log(n)) on average for most operations.
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* It is a probabilistic datastructure, meaning that it does not guarantee
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* O(log(n)), but it has been shown to approximate it over time. This
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* implementation includes the rebalancing techniques that improve on that
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* implementation includes the re-balancing techniques that improve on that
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* approximation using an adaptive technique called "splay-list". It is similar
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* to a standard skip-list, with the key distinction that the height of each
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* element adapts dynamically to its access rate: popular elements increase in
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@ -231,12 +231,12 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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for (iter = (list)->slh_length, (elm) = (list)->slh_tail; ((elm) = (elm)->field.sle_prev) != (list)->slh_head; iter--)
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/* Iterate over the next pointers in a node from bottom to top (B2T) or top to bottom (T2B). */
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#define __SKIP_ALL_ENTRIES_T2B(field, elm) for (size_t lvl = slist->slh_head->entries.sle_height - 1; lvl != (size_t)-1; lvl--)
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#define __SKIP_ALL_ENTRIES_T2B(field, elm) for (size_t lvl = slist->slh_head->field.sle_height - 1; lvl != (size_t)-1; lvl--)
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#define __SKIP_ENTRIES_T2B(field, elm) for (size_t lvl = elm->field.sle_height; lvl != (size_t)-1; lvl--)
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#define __SKIP_ENTRIES_T2B_FROM(field, elm, off) for (size_t lvl = off; lvl != (size_t)-1; lvl--)
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#define __SKIP_IS_LAST_ENTRY_T2B() if (lvl == 0)
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#define __SKIP_ALL_ENTRIES_B2T(field, elm) for (size_t lvl = 0; lvl < slist->slh_head->entries.sle_height - 1; lvl++)
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#define __SKIP_ALL_ENTRIES_B2T(field, elm) for (size_t lvl = 0; lvl < slist->slh_head->field.sle_height - 1; lvl++)
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#define __SKIP_ENTRIES_B2T(field, elm) for (size_t lvl = 0; lvl <= elm->field.sle_height; lvl++)
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#define __SKIP_ENTRIES_B2T_FROM(field, elm, off) for (size_t lvl = off; lvl <= elm->field.sle_height; lvl++)
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#define __SKIP_IS_LAST_ENTRY_B2T() if (lvl + 1 == elm->field.sle_height)
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@ -635,8 +635,8 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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*/ \
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static void __skip_rebalance_##decl(decl##_t *slist, size_t len, __skiplist_path_##decl##_t path[]) \
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{ \
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size_t i, u_hits, hits_CHu = 0, hits_CHv = 0, delta_height, cur_hits, prv_hits; \
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size_t k_threshold, m_total_hits; \
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size_t i, lvl, u_hits, hits_CHu = 0, hits_CHv = 0, delta_height; \
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size_t k_threshold, m_total_hits, expected_height; \
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double asc_cond, dsc_cond; \
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__skiplist_path_##decl##_t *p, path_u, path_v, *cur; \
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decl##_node_t *prv_node; \
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@ -644,6 +644,16 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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/* Total hits, `k`, across all nodes. */ \
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m_total_hits = slist->slh_head->field.sle_levels[slist->slh_head->field.sle_height].hits; \
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\
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/* Should we adjust the height? */ \
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if (m_total_hits > 0) { \
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expected_height = floor(log(m_total_hits) / log(2)); \
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if (expected_height > slist->slh_head->field.sle_height && expected_height < SKIPLIST_MAX_HEIGHT - 1) { \
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slist->slh_head->field.sle_height++; \
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slist->slh_head->field.sle_levels[slist->slh_head->field.sle_height].next = slist->slh_tail; \
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slist->slh_tail->field.sle_height = slist->slh_head->field.sle_height; \
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} \
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} \
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\
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/* Height of the head node, should be equal to floor(log(m_total_hits)). */ \
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k_threshold = slist->slh_head->field.sle_height; \
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\
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@ -660,8 +670,8 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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if (path_u.node == slist->slh_head || path_u.node == slist->slh_tail) \
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continue; \
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path_v = *(p + 1); \
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if ((*(p + 1)).node->entries.sle_levels[path_u.in].next != path_u.node) { \
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path_v.node = (*(p + 1)).node->entries.sle_levels[path_u.in].next; \
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if ((*(p + 1)).node->field.sle_levels[path_u.in].next != path_u.node) { \
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path_v.node = (*(p + 1)).node->field.sle_levels[path_u.in].next; \
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path_v.pu = 0; \
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} \
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\
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@ -688,21 +698,16 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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dsc_cond = m_total_hits / pow(2.0, delta_height); \
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u_hits = hits_CHu + hits_CHv; \
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if (u_hits <= dsc_cond && path_u.node->field.sle_height > 0) { \
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if (path_u.node->field.sle_prev != slist->slh_head) { \
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/* 1) go backwards along path from where we are until head */ \
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cur = &path[i]; \
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cur_hits = cur->node->field.sle_levels[cur->in].hits; \
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prv_node = (*(p + 1)).node->entries.sle_levels[path_u.in].next; \
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/* 2) propagate hits */ \
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prv_hits = prv_node->field.sle_levels[cur->in].hits; \
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prv_node->field.sle_levels[cur->in].hits += 1; \
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cur_hits = prv_hits; \
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/* 3) adjust forward pointers */ \
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if (prv_node->field.sle_levels[cur->in].next == cur->node) \
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prv_node->field.sle_levels[cur->in].next = cur->node->field.sle_levels[cur->in].next; \
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/* 4) reduce height by one */ \
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cur->node->field.sle_height--; \
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} \
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/* 1) go backwards along path from where we are until head */ \
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cur = &path[i]; \
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prv_node = (*(p + 1)).node->field.sle_levels[path_u.in].next; \
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/* 2) propagate hits */ \
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prv_node->field.sle_levels[cur->in].hits += 1; \
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/* 3) adjust forward pointers */ \
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if (prv_node->field.sle_levels[cur->in].next == cur->node) \
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prv_node->field.sle_levels[cur->in].next = cur->node->field.sle_levels[cur->in].next; \
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/* 4) reduce height by one */ \
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cur->node->field.sle_height--; \
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} \
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/* (b) Check the ascent condition: \
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* path[i].pu + node_hits > hits total / (2 ^ (height of head - height of node - 1)) \
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@ -714,16 +719,16 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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*/ \
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/* 1) check ascent condition */ \
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asc_cond = m_total_hits / pow(2.0, delta_height - 1); \
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if (path_u.pu > asc_cond && path_u.node->field.sle_height < SKIPLIST_MAX_HEIGHT) { \
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if (path_u.pu > asc_cond && path_u.node->field.sle_height < SKIPLIST_MAX_HEIGHT - 1) { \
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/* 2) increase height by one */ \
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path_u.node->field.sle_height++; \
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lvl = ++path_u.node->field.sle_height; \
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/* 3) update hit counter */ \
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path_u.node->field.sle_levels[path_v.in].hits = path_v.node->field.sle_levels[path_v.in].hits; \
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path_u.node->field.sle_levels[lvl].hits = path_v.node->field.sle_levels[lvl].hits; \
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/* 4) reset the prev node hits to 0 */ \
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path_v.node->field.sle_levels[path_v.in].hits = 0; \
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path_v.node->field.sle_levels[lvl].hits = 0; \
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/* 5) update forward pointers in the level */ \
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path_u.node->field.sle_levels[path_v.in].next = path_v.node->field.sle_levels[path_v.in].next; \
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path_v.node->field.sle_levels[path_v.in].next = path_u.node; \
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path_u.node->field.sle_levels[lvl].next = path_v.node->field.sle_levels[lvl].next; \
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path_v.node->field.sle_levels[lvl].next = path_u.node; \
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} \
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} \
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} \
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@ -734,7 +739,7 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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* Locates a node that matches another node updating `path` and then \
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* returning the length of that path + 1 to the node and the matching \
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* node in path[0], or NULL at path[0] where there wasn't a match. \
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* sizeof(path) should be `slist->slh_head->entries.sle_height + 1` \
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* sizeof(path) should be `slist->slh_head->field.sle_height + 1` \
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*/ \
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static size_t __skip_locate_##decl(decl##_t *slist, decl##_node_t *n, __skiplist_path_##decl##_t path[]) \
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{ \
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@ -767,7 +772,7 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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path[0].node = elm; \
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path[0].node->field.sle_levels[0].hits++; \
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cur->pu += path[0].node->field.sle_levels[0].hits; \
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slist->slh_head->entries.sle_levels[slist->slh_head->entries.sle_height].hits++; \
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slist->slh_head->field.sle_levels[slist->slh_head->field.sle_height].hits++; \
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__skip_rebalance_##decl(slist, len, path); \
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} \
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return len; \
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@ -784,7 +789,7 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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{ \
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static __skiplist_path_##decl##_t apath[SKIPLIST_MAX_HEIGHT + 1]; \
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int rc = 0; \
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size_t i, len, loc = 0, cur_height, new_height; \
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size_t i, len, loc = 0, current_height, new_height; \
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decl##_node_t *node; \
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__skiplist_path_##decl##_t *path = apath; \
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\
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@ -801,12 +806,12 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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/* Don't insert, duplicate if flag not set. */ \
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return -1; \
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} \
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current_height = slist->slh_head->field.sle_height - 1; \
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/* Coin toss to determine level of this new node [0, current max height) */ \
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cur_height = slist->slh_head->field.sle_height - 1; \
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new_height = __skip_toss_##decl(slist, cur_height); \
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new_height = __skip_toss_##decl(slist, current_height); \
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new->field.sle_height = new_height; \
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/* Trim the path to at most the new height for the new node. */ \
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for (i = cur_height + 1; i <= new_height; i++) { \
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for (i = current_height + 1; i <= new_height; i++) { \
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path[i + 1].node = slist->slh_tail; \
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} \
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/* Ensure all next[] point to tail. */ \
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@ -933,7 +938,7 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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* -- skip_position_gt_ \
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* \
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* Position and return a cursor at the first node that is greater than \
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* the provided node `n`. If the largestkey is less than the key in `n` \
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* the provided node `n`. If the largest key is less than the key in `n` \
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* return NULL. \
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*/ \
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decl##_node_t *prefix##skip_position_gt_##decl(decl##_t *slist, decl##_node_t *query) \
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@ -1263,7 +1268,7 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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return 0; \
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\
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/* (a) alloc, ... */ \
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size_t sle_arr_sz = sizeof(struct __skiplist_##decl##_level) * slist->slh_head->entries.sle_height - 1; \
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size_t sle_arr_sz = sizeof(struct __skiplist_##decl##_level) * slist->slh_head->field.sle_height - 1; \
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rc = prefix##skip_alloc_node_##decl(&dest); \
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if (rc) \
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return rc; \
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@ -1498,28 +1503,28 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
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return n_err; \
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} \
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\
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if (slist->slh_head->entries.sle_height > SKIPLIST_MAX_HEIGHT) { \
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if (slist->slh_head->field.sle_height > SKIPLIST_MAX_HEIGHT) { \
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__skip_integrity_failure_##decl("skiplist head height > SKIPLIST_MAX_HEIGHT\n"); \
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n_err++; \
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if (flags) \
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return n_err; \
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} \
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\
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if (slist->slh_tail->entries.sle_height > SKIPLIST_MAX_HEIGHT) { \
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if (slist->slh_tail->field.sle_height > SKIPLIST_MAX_HEIGHT) { \
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__skip_integrity_failure_##decl("skiplist tail height > SKIPLIST_MAX_HEIGHT\n"); \
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n_err++; \
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if (flags) \
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return n_err; \
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} \
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\
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if (slist->slh_head->entries.sle_height != slist->slh_tail->entries.sle_height) { \
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if (slist->slh_head->field.sle_height != slist->slh_tail->field.sle_height) { \
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__skip_integrity_failure_##decl("skiplist head & tail height are not equal\n"); \
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n_err++; \
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if (flags) \
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return n_err; \
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} \
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\
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/* TODO: slh_head->entries.sle_height should == log(m) where m is the sum of all hits on all nodes */ \
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/* TODO: slh_head->field.sle_height should == log(m) where m is the sum of all hits on all nodes */ \
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\
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if (SKIPLIST_MAX_HEIGHT < 1) { \
|
||||
__skip_integrity_failure_##decl("SKIPLIST_MAX_HEIGHT cannot be less than 1\n"); \
|
||||
|
|
@ -1576,9 +1581,9 @@ void __attribute__((format(printf, 4, 5))) __skip_diag_(const char *file, int li
|
|||
{ \
|
||||
this = &node->field; \
|
||||
\
|
||||
if (this->sle_height > slist->slh_head->entries.sle_height) { \
|
||||
if (this->sle_height > slist->slh_head->field.sle_height) { \
|
||||
__skip_integrity_failure_##decl("the %lu node's [%p] height %lu is > head %lu\n", nth, (void *)node, this->sle_height, \
|
||||
slist->slh_head->entries.sle_height); \
|
||||
slist->slh_head->field.sle_height); \
|
||||
n_err++; \
|
||||
if (flags) \
|
||||
return n_err; \
|
||||
|
|
|
|||
Loading…
Reference in a new issue