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24a58196dd
We should probably prevent any type of namespace collision with something else. Signed-off-by: Donald Sharp <sharpd@nvidia.com>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc.
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*
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* This file is part of Quagga
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*/
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#include <zebra.h>
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#include "frrevent.h"
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#include "memory.h"
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#include "hash.h"
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#include "log.h"
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#include "qobj.h"
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#include "jhash.h"
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#include "network.h"
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static uint32_t qobj_hash(const struct qobj_node *node)
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{
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return (uint32_t)node->nid;
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}
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static int qobj_cmp(const struct qobj_node *na, const struct qobj_node *nb)
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{
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if (na->nid < nb->nid)
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return -1;
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if (na->nid > nb->nid)
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return 1;
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return 0;
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}
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DECLARE_HASH(qobj_nodes, struct qobj_node, nodehash,
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qobj_cmp, qobj_hash);
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static pthread_rwlock_t nodes_lock;
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static struct qobj_nodes_head nodes = { };
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void qobj_reg(struct qobj_node *node, const struct qobj_nodetype *type)
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{
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node->type = type;
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pthread_rwlock_wrlock(&nodes_lock);
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do {
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node->nid = (uint64_t)frr_weak_random();
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node->nid ^= (uint64_t)frr_weak_random() << 32;
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} while (!node->nid || qobj_nodes_find(&nodes, node));
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qobj_nodes_add(&nodes, node);
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pthread_rwlock_unlock(&nodes_lock);
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}
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void qobj_unreg(struct qobj_node *node)
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{
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pthread_rwlock_wrlock(&nodes_lock);
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qobj_nodes_del(&nodes, node);
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pthread_rwlock_unlock(&nodes_lock);
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}
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struct qobj_node *qobj_get(uint64_t id)
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{
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struct qobj_node dummy = {.nid = id}, *rv;
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pthread_rwlock_rdlock(&nodes_lock);
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rv = qobj_nodes_find(&nodes, &dummy);
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pthread_rwlock_unlock(&nodes_lock);
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return rv;
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}
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void *qobj_get_typed(uint64_t id, const struct qobj_nodetype *type)
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{
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struct qobj_node dummy = {.nid = id};
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struct qobj_node *node;
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void *rv;
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pthread_rwlock_rdlock(&nodes_lock);
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node = qobj_nodes_find(&nodes, &dummy);
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/* note: we explicitly hold the lock until after we have checked the
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* type.
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* if the caller holds a lock that for example prevents the deletion of
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* route-maps, we can still race against a delete of something that
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* isn't
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* a route-map. */
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if (!node || node->type != type)
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rv = NULL;
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else
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rv = (char *)node - node->type->node_member_offset;
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pthread_rwlock_unlock(&nodes_lock);
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return rv;
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}
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void qobj_init(void)
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{
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pthread_rwlock_init(&nodes_lock, NULL);
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qobj_nodes_init(&nodes);
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}
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void qobj_finish(void)
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{
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struct qobj_node *node;
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while ((node = qobj_nodes_pop(&nodes)))
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qobj_nodes_del(&nodes, node);
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pthread_rwlock_destroy(&nodes_lock);
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}
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