ASTERISK_REGISTER_FILE no longer has any purpose so this commit removes all traces of it. Previously exported symbols removed: * __ast_register_file * __ast_unregister_file * ast_complete_source_filename This also removes the mtx_prof static variable that was declared when MTX_PROFILE was enabled. This variable was only used in lock.c so it is now initialized in that file only. ASTERISK-26480 #close Change-Id: I1074af07d71f9e159c48ef36631aa432c86f9966
172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/*
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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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static int named_locks_hash(const void *obj, const int flags)
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{
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const struct named_lock_proxy *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 named_lock_proxy *object_left = obj_left;
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const struct named_lock_proxy *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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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 = NULL;
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struct ast_named_lock *lock = NULL;
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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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proxy = ao2_find(named_locks, concat_key, OBJ_SEARCH_KEY | OBJ_NOLOCK);
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if (proxy) {
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ao2_unlock(named_locks);
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lock = __ao2_weakproxy_get_object(proxy, 0, __PRETTY_FUNCTION__, filename, lineno, func);
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if (lock) {
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/* We have an existing lock and it's not being destroyed. */
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ao2_ref(proxy, -1);
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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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/* the old proxy is being destroyed, clean list before creating/adding new one */
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ao2_lock(named_locks);
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ao2_unlink_flags(named_locks, proxy, OBJ_NOLOCK);
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ao2_ref(proxy, -1);
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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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