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143 lines
3.3 KiB
143 lines
3.3 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2016, Fairview 5 Engineering, LLC
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*
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* George Joseph <george.joseph@fairview5.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Named Locks
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*
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* \author George Joseph <george.joseph@fairview5.com>
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*/
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#include "asterisk.h"
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ASTERISK_REGISTER_FILE()
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#include "asterisk/_private.h"
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#include "asterisk/astobj2.h"
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#include "asterisk/named_locks.h"
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#include "asterisk/utils.h"
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struct ao2_container *named_locks;
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#define NAMED_LOCKS_BUCKETS 101
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struct ast_named_lock {
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char key[0];
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};
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static int named_locks_hash(const void *obj, const int flags)
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{
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const struct ast_named_lock *lock = obj;
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switch (flags & OBJ_SEARCH_MASK) {
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case OBJ_SEARCH_KEY:
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return ast_str_hash(obj);
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case OBJ_SEARCH_OBJECT:
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return ast_str_hash(lock->key);
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default:
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/* Hash can only work on something with a full key. */
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ast_assert(0);
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return 0;
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}
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}
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static int named_locks_cmp(void *obj_left, void *obj_right, int flags)
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{
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const struct ast_named_lock *object_left = obj_left;
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const struct ast_named_lock *object_right = obj_right;
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const char *right_key = obj_right;
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int cmp;
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switch (flags & OBJ_SEARCH_MASK) {
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case OBJ_SEARCH_OBJECT:
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right_key = object_right->key;
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/* Fall through */
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case OBJ_SEARCH_KEY:
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cmp = strcmp(object_left->key, right_key);
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break;
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case OBJ_SEARCH_PARTIAL_KEY:
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cmp = strncmp(object_left->key, right_key, strlen(right_key));
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break;
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default:
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cmp = 0;
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break;
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}
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return cmp ? 0 : CMP_MATCH;
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}
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static void named_locks_shutdown(void)
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{
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ao2_cleanup(named_locks);
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}
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int ast_named_locks_init(void)
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{
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named_locks = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0,
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NAMED_LOCKS_BUCKETS, named_locks_hash, NULL, named_locks_cmp);
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if (!named_locks) {
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return -1;
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}
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ast_register_cleanup(named_locks_shutdown);
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return 0;
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}
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struct ast_named_lock *__ast_named_lock_get(const char *filename, int lineno, const char *func,
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enum ast_named_lock_type lock_type, const char *keyspace, const char *key)
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{
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struct ast_named_lock *lock = NULL;
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int concat_key_buff_len = strlen(keyspace) + strlen(key) + 2;
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char *concat_key = ast_alloca(concat_key_buff_len);
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sprintf(concat_key, "%s-%s", keyspace, key); /* Safe */
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ao2_lock(named_locks);
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lock = ao2_find(named_locks, concat_key, OBJ_SEARCH_KEY | OBJ_NOLOCK);
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if (lock) {
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ao2_unlock(named_locks);
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ast_assert((ao2_options_get(lock) & AO2_ALLOC_OPT_LOCK_MASK) == lock_type);
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return lock;
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}
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lock = ao2_alloc_options(sizeof(*lock) + concat_key_buff_len, NULL, lock_type);
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if (lock) {
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strcpy(lock->key, concat_key); /* Safe */
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ao2_link_flags(named_locks, lock, OBJ_NOLOCK);
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}
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ao2_unlock(named_locks);
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return lock;
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}
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int __ast_named_lock_put(const char *filename, int lineno, const char *func,
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struct ast_named_lock *lock)
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{
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if (!lock) {
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return -1;
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}
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ao2_lock(named_locks);
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if (ao2_ref(lock, -1) == 2) {
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ao2_unlink_flags(named_locks, lock, OBJ_NOLOCK);
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}
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ao2_unlock(named_locks);
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return 0;
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}
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