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The reftable format includes support for an (OID => ref) map. This map can speed up visibility and reachability checks. In particular, various operations along the fetch/push path within Gerrit have ben sped up by using this structure. The map is constructed with help of a binary tree. Object IDs are hashes, so they are uniformly distributed. Hence, the tree does not attempt forced rebalancing. Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
35 lines
924 B
C
35 lines
924 B
C
/*
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Copyright 2020 Google LLC
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file or at
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https://developers.google.com/open-source/licenses/bsd
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*/
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#ifndef TREE_H
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#define TREE_H
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/* tree_node is a generic binary search tree. */
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struct tree_node {
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void *key;
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struct tree_node *left, *right;
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};
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/* looks for `key` in `rootp` using `compare` as comparison function. If insert
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* is set, insert the key if it's not found. Else, return NULL.
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*/
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struct tree_node *tree_search(void *key, struct tree_node **rootp,
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int (*compare)(const void *, const void *),
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int insert);
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/* performs an infix walk of the tree. */
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void infix_walk(struct tree_node *t, void (*action)(void *arg, void *key),
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void *arg);
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/*
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* deallocates the tree nodes recursively. Keys should be deallocated separately
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* by walking over the tree. */
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void tree_free(struct tree_node *t);
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#endif
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