124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
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/*
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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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#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 named_lock_proxy {
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AO2_WEAKPROXY();
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char key[0];
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};
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struct ast_named_lock {
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};
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AO2_STRING_FIELD_HASH_FN(named_lock_proxy, key)
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AO2_STRING_FIELD_CMP_FN(named_lock_proxy, key)
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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_lock_proxy_hash_fn, NULL, named_lock_proxy_cmp_fn);
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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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static void named_lock_proxy_cb(void *weakproxy, void *data)
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{
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ao2_unlink(named_locks, weakproxy);
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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 named_lock_proxy *proxy;
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struct ast_named_lock *lock;
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int keylen = strlen(keyspace) + strlen(key) + 2;
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char *concat_key = ast_alloca(keylen);
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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_weakproxy_find(named_locks, concat_key, OBJ_SEARCH_KEY | OBJ_NOLOCK,
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__PRETTY_FUNCTION__, filename, lineno, func);
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if (lock) {
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ast_assert((ao2_options_get(lock) & AO2_ALLOC_OPT_LOCK_MASK) == lock_type);
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ao2_unlock(named_locks);
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return lock;
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}
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proxy = ao2_t_weakproxy_alloc(sizeof(*proxy) + keylen, NULL, concat_key);
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if (!proxy) {
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goto failure_cleanup;
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}
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lock = __ao2_alloc(sizeof(*lock) + keylen, NULL, lock_type, concat_key, filename, lineno, func);
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if (!lock) {
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goto failure_cleanup;
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}
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/* We have exclusive access to proxy and lock, no need for locking here. */
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if (ao2_weakproxy_set_object(proxy, lock, OBJ_NOLOCK)) {
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goto failure_cleanup;
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}
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if (ao2_weakproxy_subscribe(proxy, named_lock_proxy_cb, NULL, OBJ_NOLOCK)) {
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goto failure_cleanup;
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}
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strcpy(proxy->key, concat_key); /* Safe */
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ao2_link_flags(named_locks, proxy, OBJ_NOLOCK);
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ao2_unlock(named_locks);
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ao2_t_ref(proxy, -1, "Release allocation reference");
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return lock;
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failure_cleanup:
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ao2_unlock(named_locks);
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ao2_cleanup(proxy);
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ao2_cleanup(lock);
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return NULL;
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}
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