mirror of
https://github.com/openvswitch/ovs
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fe59694bee
Define rule_collection in terms of a new object_collection. This makes it easier to add other types of collections later. This patch makes no functional changes. Signed-off-by: Jarno Rajahalme <jarno@ovn.org> Acked-by: Ben Pfaff <blp@ovn.org>
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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* Copyright (c) 2016 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "object-collection.h"
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#include "util.h"
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void
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object_collection_init(struct object_collection *coll)
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{
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coll->objs = coll->stub;
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coll->n = 0;
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coll->capacity = ARRAY_SIZE(coll->stub);
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}
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void
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object_collection_add(struct object_collection *coll, void *obj)
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{
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if (coll->n >= coll->capacity) {
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size_t old_size, new_size;
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old_size = coll->capacity * sizeof *coll->objs;
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coll->capacity *= 2;
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new_size = coll->capacity * sizeof *coll->objs;
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if (coll->objs == coll->stub) {
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coll->objs = xmalloc(new_size);
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memcpy(coll->objs, coll->stub, old_size);
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} else {
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coll->objs = xrealloc(coll->objs, new_size);
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}
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}
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coll->objs[coll->n++] = obj;
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}
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void
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object_collection_remove(struct object_collection *coll, void *obj)
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{
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size_t i;
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for (i = 0; i < coll->n; i++) {
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if (coll->objs[i] == obj) {
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break;
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}
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}
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if (i == coll->n) {
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return;
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}
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coll->n--;
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/* Swap the last item in if needed. */
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if (i != coll->n) {
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coll->objs[i] = coll->objs[coll->n];
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}
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/* Shrink? Watermark at '/ 4' to get hysteresis and leave spare
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* capacity. */
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if (coll->objs != coll->stub && coll->n <= coll->capacity / 4) {
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size_t actual_size, new_size;
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actual_size = coll->n * sizeof *coll->objs;
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coll->capacity /= 2;
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new_size = coll->capacity * sizeof *coll->objs;
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if (new_size <= sizeof(coll->stub)) {
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memcpy(coll->stub, coll->objs, actual_size);
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free(coll->objs);
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coll->objs = coll->stub;
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} else {
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coll->objs = xrealloc(coll->objs, new_size);
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}
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}
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}
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void
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object_collection_move(struct object_collection *to,
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struct object_collection *from)
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{
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ovs_assert(to->n == 0);
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*to = *from;
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if (from->objs == from->stub) {
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to->objs = to->stub;
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}
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object_collection_init(from);
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}
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/* Returns a NULL-terminated array of object pointers,
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* destroys 'rules'. */
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void *
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object_collection_detach(struct object_collection *coll)
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{
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void **array;
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object_collection_add(coll, NULL);
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if (coll->objs == coll->stub) {
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coll->objs = xmemdup(coll->objs, coll->n * sizeof *coll->objs);
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}
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array = coll->objs;
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object_collection_init(coll);
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return array;
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}
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void
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object_collection_destroy(struct object_collection *coll)
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{
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if (coll->objs != coll->stub) {
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free(coll->objs);
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}
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/* Make repeated destruction harmless. */
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object_collection_init(coll);
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}
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