1230 lines
32 KiB
C
1230 lines
32 KiB
C
/*
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* astobj2 - replacement containers for asterisk data structures.
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*
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* Copyright (C) 2006 Marta Carbone, Luigi Rizzo - Univ. di Pisa, Italy
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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 Functions implementing astobj2 objects.
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*
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* \author Richard Mudgett <rmudgett@digium.com>
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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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 "astobj2_private.h"
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#include "astobj2_container_private.h"
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#include "asterisk/cli.h"
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#include "asterisk/paths.h"
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/* Use ast_log_safe in place of ast_log. */
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#define ast_log ast_log_safe
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static FILE *ref_log;
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/*!
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* astobj2 objects are always preceded by this data structure,
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* which contains a reference counter,
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* option flags and a pointer to a destructor.
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* The refcount is used to decide when it is time to
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* invoke the destructor.
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* The magic number is used for consistency check.
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*/
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struct __priv_data {
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int ref_counter;
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ao2_destructor_fn destructor_fn;
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/*! This field is used for astobj2 and ao2_weakproxy objects to reference each other */
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void *weakptr;
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#if defined(AO2_DEBUG)
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/*! User data size for stats */
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size_t data_size;
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#endif
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/*! The ao2 object option flags */
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uint32_t options;
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/*! magic number. This is used to verify that a pointer passed in is a
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* valid astobj2 or ao2_weak reference */
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uint32_t magic;
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};
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#define AO2_MAGIC 0xa570b123
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#define AO2_WEAK 0xa570b122
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#define IS_AO2_MAGIC_BAD(p) (AO2_MAGIC != (p->priv_data.magic | 1))
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/*!
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* What an astobj2 object looks like: fixed-size private data
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* followed by variable-size user data.
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*/
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struct astobj2 {
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struct __priv_data priv_data;
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void *user_data[0];
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};
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struct ao2_weakproxy_notification {
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ao2_weakproxy_notification_cb cb;
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void *data;
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AST_LIST_ENTRY(ao2_weakproxy_notification) list;
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};
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static void weakproxy_run_callbacks(struct ao2_weakproxy *weakproxy);
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struct ao2_lock_priv {
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ast_mutex_t lock;
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};
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/* AstObj2 with recursive lock. */
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struct astobj2_lock {
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struct ao2_lock_priv mutex;
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struct __priv_data priv_data;
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void *user_data[0];
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};
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struct ao2_rwlock_priv {
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ast_rwlock_t lock;
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/*! Count of the number of threads holding a lock on this object. -1 if it is the write lock. */
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int num_lockers;
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};
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/* AstObj2 with RW lock. */
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struct astobj2_rwlock {
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struct ao2_rwlock_priv rwlock;
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struct __priv_data priv_data;
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void *user_data[0];
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};
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struct ao2_lockobj_priv {
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void *lock;
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};
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/* AstObj2 with locking provided by a separate object. */
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struct astobj2_lockobj {
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struct ao2_lockobj_priv lockobj;
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struct __priv_data priv_data;
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void *user_data[0];
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};
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#ifdef AO2_DEBUG
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struct ao2_stats ao2;
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#endif
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#define INTERNAL_OBJ_MUTEX(user_data) \
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((struct astobj2_lock *) (((char *) (user_data)) - sizeof(struct astobj2_lock)))
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#define INTERNAL_OBJ_RWLOCK(user_data) \
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((struct astobj2_rwlock *) (((char *) (user_data)) - sizeof(struct astobj2_rwlock)))
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#define INTERNAL_OBJ_LOCKOBJ(user_data) \
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((struct astobj2_lockobj *) (((char *) (user_data)) - sizeof(struct astobj2_lockobj)))
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#define INTERNAL_OBJ(user_data) \
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(struct astobj2 *) ((char *) user_data - sizeof(struct astobj2))
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/*!
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* \brief convert from a pointer _p to a user-defined object
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*
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* \return the pointer to the astobj2 structure
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*/
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#define __INTERNAL_OBJ_CHECK(user_data, file, line, func) \
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({ \
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struct astobj2 *p ## __LINE__; \
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if (!user_data \
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|| !(p ## __LINE__ = INTERNAL_OBJ(user_data)) \
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|| IS_AO2_MAGIC_BAD(p ## __LINE__)) { \
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log_bad_ao2(user_data, file, line, func); \
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p ## __LINE__ = NULL; \
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} \
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(p ## __LINE__); \
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})
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#define INTERNAL_OBJ_CHECK(user_data) \
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__INTERNAL_OBJ_CHECK(user_data, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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/*!
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* \brief convert from a pointer _p to an astobj2 object
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*
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* \return the pointer to the user-defined portion.
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*/
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#define EXTERNAL_OBJ(_p) ((_p) == NULL ? NULL : (_p)->user_data)
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int internal_is_ao2_object(void *user_data)
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{
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struct astobj2 *p;
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if (!user_data) {
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return 0;
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}
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p = INTERNAL_OBJ(user_data);
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return !p || IS_AO2_MAGIC_BAD(p) ? 0 : 1;
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}
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void log_bad_ao2(void *user_data, const char *file, int line, const char *func)
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{
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struct astobj2 *p;
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char bad_magic[100];
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if (!user_data) {
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__ast_assert_failed(0, "user_data is NULL", file, line, func);
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return;
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}
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p = INTERNAL_OBJ(user_data);
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snprintf(bad_magic, sizeof(bad_magic), "bad magic number 0x%x for object %p",
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p->priv_data.magic, user_data);
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__ast_assert_failed(0, bad_magic, file, line, func);
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}
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int __ao2_lock(void *user_data, enum ao2_lock_req lock_how, const char *file, const char *func, int line, const char *var)
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{
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struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
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struct astobj2_lock *obj_mutex;
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struct astobj2_rwlock *obj_rwlock;
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struct astobj2_lockobj *obj_lockobj;
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int res = 0;
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if (obj == NULL) {
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return -1;
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}
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switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
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case AO2_ALLOC_OPT_LOCK_MUTEX:
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obj_mutex = INTERNAL_OBJ_MUTEX(user_data);
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res = __ast_pthread_mutex_lock(file, line, func, var, &obj_mutex->mutex.lock);
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#ifdef AO2_DEBUG
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if (!res) {
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ast_atomic_fetchadd_int(&ao2.total_locked, 1);
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}
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#endif
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break;
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case AO2_ALLOC_OPT_LOCK_RWLOCK:
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obj_rwlock = INTERNAL_OBJ_RWLOCK(user_data);
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switch (lock_how) {
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case AO2_LOCK_REQ_MUTEX:
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case AO2_LOCK_REQ_WRLOCK:
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res = __ast_rwlock_wrlock(file, line, func, &obj_rwlock->rwlock.lock, var);
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if (!res) {
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ast_atomic_fetchadd_int(&obj_rwlock->rwlock.num_lockers, -1);
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#ifdef AO2_DEBUG
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ast_atomic_fetchadd_int(&ao2.total_locked, 1);
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#endif
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}
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break;
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case AO2_LOCK_REQ_RDLOCK:
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res = __ast_rwlock_rdlock(file, line, func, &obj_rwlock->rwlock.lock, var);
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if (!res) {
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ast_atomic_fetchadd_int(&obj_rwlock->rwlock.num_lockers, +1);
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#ifdef AO2_DEBUG
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ast_atomic_fetchadd_int(&ao2.total_locked, 1);
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#endif
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}
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break;
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}
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break;
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case AO2_ALLOC_OPT_LOCK_NOLOCK:
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/* The ao2 object has no lock. */
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break;
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case AO2_ALLOC_OPT_LOCK_OBJ:
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obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
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res = __ao2_lock(obj_lockobj->lockobj.lock, lock_how, file, func, line, var);
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break;
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default:
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ast_log(__LOG_ERROR, file, line, func, "Invalid lock option on ao2 object %p\n",
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user_data);
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return -1;
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}
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return res;
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}
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int __ao2_unlock(void *user_data, const char *file, const char *func, int line, const char *var)
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{
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struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
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struct astobj2_lock *obj_mutex;
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struct astobj2_rwlock *obj_rwlock;
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struct astobj2_lockobj *obj_lockobj;
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int res = 0;
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int current_value;
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if (obj == NULL) {
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return -1;
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}
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switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
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case AO2_ALLOC_OPT_LOCK_MUTEX:
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obj_mutex = INTERNAL_OBJ_MUTEX(user_data);
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res = __ast_pthread_mutex_unlock(file, line, func, var, &obj_mutex->mutex.lock);
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#ifdef AO2_DEBUG
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if (!res) {
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ast_atomic_fetchadd_int(&ao2.total_locked, -1);
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}
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#endif
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break;
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case AO2_ALLOC_OPT_LOCK_RWLOCK:
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obj_rwlock = INTERNAL_OBJ_RWLOCK(user_data);
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current_value = ast_atomic_fetchadd_int(&obj_rwlock->rwlock.num_lockers, -1) - 1;
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if (current_value < 0) {
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/* It was a WRLOCK that we are unlocking. Fix the count. */
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ast_atomic_fetchadd_int(&obj_rwlock->rwlock.num_lockers, -current_value);
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}
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res = __ast_rwlock_unlock(file, line, func, &obj_rwlock->rwlock.lock, var);
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#ifdef AO2_DEBUG
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if (!res) {
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ast_atomic_fetchadd_int(&ao2.total_locked, -1);
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}
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#endif
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break;
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case AO2_ALLOC_OPT_LOCK_NOLOCK:
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/* The ao2 object has no lock. */
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break;
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case AO2_ALLOC_OPT_LOCK_OBJ:
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obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
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res = __ao2_unlock(obj_lockobj->lockobj.lock, file, func, line, var);
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break;
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default:
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ast_log(__LOG_ERROR, file, line, func, "Invalid lock option on ao2 object %p\n",
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user_data);
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res = -1;
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break;
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}
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return res;
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}
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int __ao2_trylock(void *user_data, enum ao2_lock_req lock_how, const char *file, const char *func, int line, const char *var)
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{
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struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
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struct astobj2_lock *obj_mutex;
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struct astobj2_rwlock *obj_rwlock;
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struct astobj2_lockobj *obj_lockobj;
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int res = 0;
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if (obj == NULL) {
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return -1;
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}
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switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
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case AO2_ALLOC_OPT_LOCK_MUTEX:
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obj_mutex = INTERNAL_OBJ_MUTEX(user_data);
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res = __ast_pthread_mutex_trylock(file, line, func, var, &obj_mutex->mutex.lock);
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#ifdef AO2_DEBUG
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if (!res) {
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ast_atomic_fetchadd_int(&ao2.total_locked, 1);
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}
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#endif
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break;
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case AO2_ALLOC_OPT_LOCK_RWLOCK:
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obj_rwlock = INTERNAL_OBJ_RWLOCK(user_data);
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switch (lock_how) {
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case AO2_LOCK_REQ_MUTEX:
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case AO2_LOCK_REQ_WRLOCK:
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res = __ast_rwlock_trywrlock(file, line, func, &obj_rwlock->rwlock.lock, var);
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if (!res) {
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ast_atomic_fetchadd_int(&obj_rwlock->rwlock.num_lockers, -1);
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#ifdef AO2_DEBUG
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ast_atomic_fetchadd_int(&ao2.total_locked, 1);
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#endif
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}
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break;
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case AO2_LOCK_REQ_RDLOCK:
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res = __ast_rwlock_tryrdlock(file, line, func, &obj_rwlock->rwlock.lock, var);
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if (!res) {
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ast_atomic_fetchadd_int(&obj_rwlock->rwlock.num_lockers, +1);
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#ifdef AO2_DEBUG
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ast_atomic_fetchadd_int(&ao2.total_locked, 1);
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#endif
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}
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break;
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}
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break;
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case AO2_ALLOC_OPT_LOCK_NOLOCK:
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/* The ao2 object has no lock. */
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return 0;
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case AO2_ALLOC_OPT_LOCK_OBJ:
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obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
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res = __ao2_trylock(obj_lockobj->lockobj.lock, lock_how, file, func, line, var);
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break;
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default:
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ast_log(__LOG_ERROR, file, line, func, "Invalid lock option on ao2 object %p\n",
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user_data);
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return -1;
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}
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return res;
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}
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/*!
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* \internal
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* \brief Adjust an object's lock to the requested level.
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*
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* \param user_data An ao2 object to adjust lock level.
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* \param lock_how What level to adjust lock.
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* \param keep_stronger TRUE if keep original lock level if it is stronger.
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*
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* \pre The ao2 object is already locked.
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*
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* \details
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* An ao2 object with a RWLOCK will have its lock level adjusted
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* to the specified level if it is not already there. An ao2
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* object with a different type of lock is not affected.
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*
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* \return Original lock level.
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*/
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enum ao2_lock_req __adjust_lock(void *user_data, enum ao2_lock_req lock_how, int keep_stronger)
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{
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struct astobj2 *obj = INTERNAL_OBJ(user_data);
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struct astobj2_rwlock *obj_rwlock;
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struct astobj2_lockobj *obj_lockobj;
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enum ao2_lock_req orig_lock;
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switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
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case AO2_ALLOC_OPT_LOCK_RWLOCK:
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obj_rwlock = INTERNAL_OBJ_RWLOCK(user_data);
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if (obj_rwlock->rwlock.num_lockers < 0) {
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orig_lock = AO2_LOCK_REQ_WRLOCK;
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} else {
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orig_lock = AO2_LOCK_REQ_RDLOCK;
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}
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switch (lock_how) {
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case AO2_LOCK_REQ_MUTEX:
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lock_how = AO2_LOCK_REQ_WRLOCK;
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/* Fall through */
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case AO2_LOCK_REQ_WRLOCK:
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if (lock_how != orig_lock) {
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/* Switch from read lock to write lock. */
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ao2_unlock(user_data);
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ao2_wrlock(user_data);
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}
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break;
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case AO2_LOCK_REQ_RDLOCK:
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if (!keep_stronger && lock_how != orig_lock) {
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/* Switch from write lock to read lock. */
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ao2_unlock(user_data);
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ao2_rdlock(user_data);
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}
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break;
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}
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break;
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case AO2_ALLOC_OPT_LOCK_OBJ:
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obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
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orig_lock = __adjust_lock(obj_lockobj->lockobj.lock, lock_how, keep_stronger);
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break;
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default:
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ast_log(LOG_ERROR, "Invalid lock option on ao2 object %p\n", user_data);
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/* Fall through */
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case AO2_ALLOC_OPT_LOCK_NOLOCK:
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case AO2_ALLOC_OPT_LOCK_MUTEX:
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orig_lock = AO2_LOCK_REQ_MUTEX;
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break;
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}
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return orig_lock;
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}
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|
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void *ao2_object_get_lockaddr(void *user_data)
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{
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struct astobj2 *obj;
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struct astobj2_lock *obj_mutex;
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|
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obj = INTERNAL_OBJ_CHECK(user_data);
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|
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if (obj == NULL) {
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return NULL;
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}
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|
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switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
|
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case AO2_ALLOC_OPT_LOCK_MUTEX:
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obj_mutex = INTERNAL_OBJ_MUTEX(user_data);
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return &obj_mutex->mutex.lock;
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default:
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break;
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}
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|
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return NULL;
|
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}
|
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|
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int __ao2_ref(void *user_data, int delta,
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const char *tag, const char *file, int line, const char *func)
|
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{
|
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struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
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struct astobj2_lock *obj_mutex;
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struct astobj2_rwlock *obj_rwlock;
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struct astobj2_lockobj *obj_lockobj;
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int current_value;
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int ret;
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void *weakproxy = NULL;
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|
|
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if (obj == NULL) {
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if (ref_log && user_data) {
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fprintf(ref_log, "%p,%d,%d,%s,%d,%s,**invalid**,%s\n",
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user_data, delta, ast_get_tid(), file, line, func, tag ?: "");
|
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fflush(ref_log);
|
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}
|
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return -1;
|
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}
|
|
|
|
/* if delta is 0, just return the refcount */
|
|
if (delta == 0) {
|
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return obj->priv_data.ref_counter;
|
|
}
|
|
|
|
if (delta < 0 && obj->priv_data.magic == AO2_MAGIC && (weakproxy = obj->priv_data.weakptr)) {
|
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ao2_lock(weakproxy);
|
|
}
|
|
|
|
/* we modify with an atomic operation the reference counter */
|
|
ret = ast_atomic_fetchadd_int(&obj->priv_data.ref_counter, delta);
|
|
current_value = ret + delta;
|
|
|
|
#ifdef AO2_DEBUG
|
|
ast_atomic_fetchadd_int(&ao2.total_refs, delta);
|
|
#endif
|
|
|
|
if (weakproxy) {
|
|
if (current_value == 1) {
|
|
/* The only remaining reference is the one owned by the weak object */
|
|
struct astobj2 *internal_weakproxy;
|
|
|
|
internal_weakproxy = INTERNAL_OBJ_CHECK(weakproxy);
|
|
|
|
/* Unlink the obj from the weak proxy */
|
|
internal_weakproxy->priv_data.weakptr = NULL;
|
|
obj->priv_data.weakptr = NULL;
|
|
|
|
/* Notify the subscribers that weakproxy now points to NULL. */
|
|
weakproxy_run_callbacks(weakproxy);
|
|
|
|
/* weak is already unlinked from obj so this won't recurse */
|
|
ao2_ref(user_data, -1);
|
|
}
|
|
|
|
ao2_unlock(weakproxy);
|
|
|
|
if (current_value == 1) {
|
|
ao2_ref(weakproxy, -1);
|
|
}
|
|
}
|
|
|
|
if (0 < current_value) {
|
|
/* The object still lives. */
|
|
#define EXCESSIVE_REF_COUNT 100000
|
|
|
|
if (EXCESSIVE_REF_COUNT <= current_value && ret < EXCESSIVE_REF_COUNT) {
|
|
char excessive_ref_buf[100];
|
|
|
|
/* We just reached or went over the excessive ref count trigger */
|
|
snprintf(excessive_ref_buf, sizeof(excessive_ref_buf),
|
|
"Excessive refcount %d reached on ao2 object %p",
|
|
current_value, user_data);
|
|
ast_log(__LOG_ERROR, file, line, func, "%s\n", excessive_ref_buf);
|
|
|
|
__ast_assert_failed(0, excessive_ref_buf, file, line, func);
|
|
}
|
|
|
|
if (ref_log && tag) {
|
|
fprintf(ref_log, "%p,%s%d,%d,%s,%d,%s,%d,%s\n", user_data,
|
|
(delta < 0 ? "" : "+"), delta, ast_get_tid(),
|
|
file, line, func, ret, tag);
|
|
fflush(ref_log);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* this case must never happen */
|
|
if (current_value < 0) {
|
|
ast_log(__LOG_ERROR, file, line, func,
|
|
"Invalid refcount %d on ao2 object %p\n", current_value, user_data);
|
|
if (ref_log) {
|
|
/* Log to ref_log invalid even if (tag == NULL) */
|
|
fprintf(ref_log, "%p,%d,%d,%s,%d,%s,**invalid**,%s\n",
|
|
user_data, delta, ast_get_tid(), file, line, func, tag ?: "");
|
|
fflush(ref_log);
|
|
}
|
|
ast_assert(0);
|
|
/* stop here even if assert doesn't DO_CRASH */
|
|
return -1;
|
|
}
|
|
|
|
/* last reference, destroy the object */
|
|
if (obj->priv_data.destructor_fn != NULL) {
|
|
obj->priv_data.destructor_fn(user_data);
|
|
}
|
|
|
|
#ifdef AO2_DEBUG
|
|
ast_atomic_fetchadd_int(&ao2.total_mem, - obj->priv_data.data_size);
|
|
ast_atomic_fetchadd_int(&ao2.total_objects, -1);
|
|
#endif
|
|
|
|
/* In case someone uses an object after it's been freed */
|
|
obj->priv_data.magic = 0;
|
|
|
|
switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
|
|
case AO2_ALLOC_OPT_LOCK_MUTEX:
|
|
obj_mutex = INTERNAL_OBJ_MUTEX(user_data);
|
|
ast_mutex_destroy(&obj_mutex->mutex.lock);
|
|
|
|
ast_free(obj_mutex);
|
|
break;
|
|
case AO2_ALLOC_OPT_LOCK_RWLOCK:
|
|
obj_rwlock = INTERNAL_OBJ_RWLOCK(user_data);
|
|
ast_rwlock_destroy(&obj_rwlock->rwlock.lock);
|
|
|
|
ast_free(obj_rwlock);
|
|
break;
|
|
case AO2_ALLOC_OPT_LOCK_NOLOCK:
|
|
ast_free(obj);
|
|
break;
|
|
case AO2_ALLOC_OPT_LOCK_OBJ:
|
|
obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
|
|
ao2_t_ref(obj_lockobj->lockobj.lock, -1, "release lockobj");
|
|
|
|
ast_free(obj_lockobj);
|
|
break;
|
|
default:
|
|
ast_log(__LOG_ERROR, file, line, func,
|
|
"Invalid lock option on ao2 object %p\n", user_data);
|
|
break;
|
|
}
|
|
|
|
if (ref_log && tag) {
|
|
fprintf(ref_log, "%p,%d,%d,%s,%d,%s,**destructor**,%s\n",
|
|
user_data, delta, ast_get_tid(), file, line, func, tag);
|
|
fflush(ref_log);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __ao2_cleanup_debug(void *obj, const char *tag, const char *file, int line, const char *function)
|
|
{
|
|
if (obj) {
|
|
__ao2_ref(obj, -1, tag, file, line, function);
|
|
}
|
|
}
|
|
|
|
void __ao2_cleanup(void *obj)
|
|
{
|
|
if (obj) {
|
|
ao2_ref(obj, -1);
|
|
}
|
|
}
|
|
|
|
static void *internal_ao2_alloc(size_t data_size, ao2_destructor_fn destructor_fn, unsigned int options,
|
|
void *lockobj, const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
/* allocation */
|
|
struct astobj2 *obj;
|
|
struct astobj2_lock *obj_mutex;
|
|
struct astobj2_rwlock *obj_rwlock;
|
|
struct astobj2_lockobj *obj_lockobj;
|
|
|
|
switch (options & AO2_ALLOC_OPT_LOCK_MASK) {
|
|
case AO2_ALLOC_OPT_LOCK_MUTEX:
|
|
obj_mutex = __ast_calloc(1, sizeof(*obj_mutex) + data_size, file, line, func);
|
|
if (obj_mutex == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
ast_mutex_init(&obj_mutex->mutex.lock);
|
|
obj = (struct astobj2 *) &obj_mutex->priv_data;
|
|
break;
|
|
case AO2_ALLOC_OPT_LOCK_RWLOCK:
|
|
obj_rwlock = __ast_calloc(1, sizeof(*obj_rwlock) + data_size, file, line, func);
|
|
if (obj_rwlock == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
ast_rwlock_init(&obj_rwlock->rwlock.lock);
|
|
obj = (struct astobj2 *) &obj_rwlock->priv_data;
|
|
break;
|
|
case AO2_ALLOC_OPT_LOCK_NOLOCK:
|
|
obj = __ast_calloc(1, sizeof(*obj) + data_size, file, line, func);
|
|
if (obj == NULL) {
|
|
return NULL;
|
|
}
|
|
break;
|
|
case AO2_ALLOC_OPT_LOCK_OBJ:
|
|
lockobj = ao2_t_bump(lockobj, "set lockobj");
|
|
if (!lockobj) {
|
|
ast_log(__LOG_ERROR, file, line, func, "AO2_ALLOC_OPT_LOCK_OBJ requires a non-NULL lockobj.\n");
|
|
return NULL;
|
|
}
|
|
|
|
obj_lockobj = __ast_calloc(1, sizeof(*obj_lockobj) + data_size, file, line, func);
|
|
if (obj_lockobj == NULL) {
|
|
ao2_t_ref(lockobj, -1, "release lockobj for failed alloc");
|
|
return NULL;
|
|
}
|
|
|
|
obj_lockobj->lockobj.lock = lockobj;
|
|
obj = (struct astobj2 *) &obj_lockobj->priv_data;
|
|
break;
|
|
default:
|
|
/* Invalid option value. */
|
|
ast_log(__LOG_DEBUG, file, line, func, "Invalid lock option requested\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Initialize common ao2 values. */
|
|
obj->priv_data.ref_counter = 1;
|
|
obj->priv_data.destructor_fn = destructor_fn; /* can be NULL */
|
|
obj->priv_data.options = options;
|
|
obj->priv_data.magic = AO2_MAGIC;
|
|
|
|
#ifdef AO2_DEBUG
|
|
obj->priv_data.data_size = data_size;
|
|
ast_atomic_fetchadd_int(&ao2.total_objects, 1);
|
|
ast_atomic_fetchadd_int(&ao2.total_mem, data_size);
|
|
ast_atomic_fetchadd_int(&ao2.total_refs, 1);
|
|
#endif
|
|
|
|
if (ref_log && tag) {
|
|
fprintf(ref_log, "%p,+1,%d,%s,%d,%s,**constructor**,%s\n",
|
|
EXTERNAL_OBJ(obj), ast_get_tid(), file, line, func, tag);
|
|
fflush(ref_log);
|
|
}
|
|
|
|
/* return a pointer to the user data */
|
|
return EXTERNAL_OBJ(obj);
|
|
}
|
|
|
|
void *__ao2_alloc(size_t data_size, ao2_destructor_fn destructor_fn, unsigned int options,
|
|
const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
return internal_ao2_alloc(data_size, destructor_fn, options, NULL, tag, file, line, func);
|
|
}
|
|
|
|
void *__ao2_alloc_with_lockobj(size_t data_size, ao2_destructor_fn destructor_fn, void *lockobj,
|
|
const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
return internal_ao2_alloc(data_size, destructor_fn, AO2_ALLOC_OPT_LOCK_OBJ, lockobj,
|
|
tag, file, line, func);
|
|
}
|
|
|
|
unsigned int ao2_options_get(void *obj)
|
|
{
|
|
struct astobj2 *orig_obj;
|
|
|
|
orig_obj = INTERNAL_OBJ_CHECK(obj);
|
|
if (!orig_obj) {
|
|
return 0;
|
|
}
|
|
return orig_obj->priv_data.options;
|
|
}
|
|
|
|
|
|
void __ao2_global_obj_release(struct ao2_global_obj *holder, const char *tag, const char *file, int line, const char *func, const char *name)
|
|
{
|
|
if (!holder) {
|
|
/* For sanity */
|
|
ast_log(LOG_ERROR, "Must be called with a global object!\n");
|
|
ast_assert(0);
|
|
return;
|
|
}
|
|
if (__ast_rwlock_wrlock(file, line, func, &holder->lock, name)) {
|
|
/* Could not get the write lock. */
|
|
ast_assert(0);
|
|
return;
|
|
}
|
|
|
|
/* Release the held ao2 object. */
|
|
if (holder->obj) {
|
|
__ao2_ref(holder->obj, -1, tag, file, line, func);
|
|
holder->obj = NULL;
|
|
}
|
|
|
|
__ast_rwlock_unlock(file, line, func, &holder->lock, name);
|
|
}
|
|
|
|
void *__ao2_global_obj_replace(struct ao2_global_obj *holder, void *obj, const char *tag, const char *file, int line, const char *func, const char *name)
|
|
{
|
|
void *obj_old;
|
|
|
|
if (!holder) {
|
|
/* For sanity */
|
|
ast_log(LOG_ERROR, "Must be called with a global object!\n");
|
|
ast_assert(0);
|
|
return NULL;
|
|
}
|
|
if (__ast_rwlock_wrlock(file, line, func, &holder->lock, name)) {
|
|
/* Could not get the write lock. */
|
|
ast_assert(0);
|
|
return NULL;
|
|
}
|
|
|
|
if (obj) {
|
|
__ao2_ref(obj, +1, tag, file, line, func);
|
|
}
|
|
obj_old = holder->obj;
|
|
holder->obj = obj;
|
|
|
|
__ast_rwlock_unlock(file, line, func, &holder->lock, name);
|
|
|
|
return obj_old;
|
|
}
|
|
|
|
int __ao2_global_obj_replace_unref(struct ao2_global_obj *holder, void *obj, const char *tag, const char *file, int line, const char *func, const char *name)
|
|
{
|
|
void *obj_old;
|
|
|
|
obj_old = __ao2_global_obj_replace(holder, obj, tag, file, line, func, name);
|
|
if (obj_old) {
|
|
__ao2_ref(obj_old, -1, tag, file, line, func);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void *__ao2_global_obj_ref(struct ao2_global_obj *holder, const char *tag, const char *file, int line, const char *func, const char *name)
|
|
{
|
|
void *obj;
|
|
|
|
if (!holder) {
|
|
/* For sanity */
|
|
ast_log(LOG_ERROR, "Must be called with a global object!\n");
|
|
ast_assert(0);
|
|
return NULL;
|
|
}
|
|
|
|
if (__ast_rwlock_rdlock(file, line, func, &holder->lock, name)) {
|
|
/* Could not get the read lock. */
|
|
ast_assert(0);
|
|
return NULL;
|
|
}
|
|
|
|
obj = holder->obj;
|
|
if (obj) {
|
|
__ao2_ref(obj, +1, tag, file, line, func);
|
|
}
|
|
|
|
__ast_rwlock_unlock(file, line, func, &holder->lock, name);
|
|
|
|
return obj;
|
|
}
|
|
|
|
|
|
static void weakproxy_run_callbacks(struct ao2_weakproxy *weakproxy)
|
|
{
|
|
struct ao2_weakproxy_notification *destroyed_cb;
|
|
|
|
while ((destroyed_cb = AST_LIST_REMOVE_HEAD(&weakproxy->destroyed_cb, list))) {
|
|
destroyed_cb->cb(weakproxy, destroyed_cb->data);
|
|
ast_free(destroyed_cb);
|
|
}
|
|
}
|
|
|
|
void *__ao2_weakproxy_alloc(size_t data_size, ao2_destructor_fn destructor_fn,
|
|
const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
struct ao2_weakproxy *weakproxy;
|
|
|
|
if (data_size < sizeof(*weakproxy)) {
|
|
ast_assert(0);
|
|
ast_log(LOG_ERROR, "Requested data_size smaller than minimum.\n");
|
|
return NULL;
|
|
}
|
|
|
|
weakproxy = __ao2_alloc(data_size, destructor_fn, AO2_ALLOC_OPT_LOCK_MUTEX,
|
|
tag, file, line, func);
|
|
|
|
if (weakproxy) {
|
|
struct astobj2 *weakproxy_internal;
|
|
|
|
/* Just created weakproxy, no need to check if it's valid. */
|
|
weakproxy_internal = INTERNAL_OBJ(weakproxy);
|
|
weakproxy_internal->priv_data.magic = AO2_WEAK;
|
|
}
|
|
|
|
return weakproxy;
|
|
}
|
|
|
|
int __ao2_weakproxy_set_object(void *weakproxy, void *obj, int flags,
|
|
const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
struct astobj2 *weakproxy_internal = __INTERNAL_OBJ_CHECK(weakproxy, file, line, func);
|
|
struct astobj2 *obj_internal = __INTERNAL_OBJ_CHECK(obj, file, line, func);
|
|
int ret = -1;
|
|
|
|
if (!weakproxy_internal
|
|
|| weakproxy_internal->priv_data.magic != AO2_WEAK) {
|
|
return -1;
|
|
}
|
|
|
|
if (!obj_internal
|
|
|| obj_internal->priv_data.weakptr
|
|
|| obj_internal->priv_data.magic != AO2_MAGIC) {
|
|
return -1;
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_lock(weakproxy);
|
|
}
|
|
|
|
if (!weakproxy_internal->priv_data.weakptr) {
|
|
__ao2_ref(obj, +1, tag, file, line, func);
|
|
__ao2_ref(weakproxy, +1, tag, file, line, func);
|
|
|
|
weakproxy_internal->priv_data.weakptr = obj;
|
|
obj_internal->priv_data.weakptr = weakproxy;
|
|
|
|
ret = 0;
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_unlock(weakproxy);
|
|
/* It is possible for obj to be accessed now. It's allowed
|
|
* for weakproxy to already be in a container. Another thread
|
|
* could have been waiting for a lock on weakproxy to retreive
|
|
* the object.
|
|
*/
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int __ao2_weakproxy_ref_object(void *weakproxy, int delta, int flags,
|
|
const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
struct astobj2 *internal = __INTERNAL_OBJ_CHECK(weakproxy, file, line, func);
|
|
int ret = -1;
|
|
|
|
if (!internal || internal->priv_data.magic != AO2_WEAK) {
|
|
/* This method is meant to be run on weakproxy objects! */
|
|
return -2;
|
|
}
|
|
|
|
/* We have a weak object, grab lock. */
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_lock(weakproxy);
|
|
}
|
|
|
|
if (internal->priv_data.weakptr) {
|
|
ret = __ao2_ref(internal->priv_data.weakptr, delta, tag, file, line, func);
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_unlock(weakproxy);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void *__ao2_weakproxy_get_object(void *weakproxy, int flags,
|
|
const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
struct astobj2 *internal = __INTERNAL_OBJ_CHECK(weakproxy, file, line, func);
|
|
void *obj;
|
|
|
|
if (!internal || internal->priv_data.magic != AO2_WEAK) {
|
|
/* This method is meant to be run on weakproxy objects! */
|
|
return NULL;
|
|
}
|
|
|
|
/* We have a weak object, grab reference to object within lock */
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_lock(weakproxy);
|
|
}
|
|
|
|
obj = internal->priv_data.weakptr;
|
|
if (obj) {
|
|
__ao2_ref(obj, +1, tag, file, line, func);
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_unlock(weakproxy);
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
|
|
void *__ao2_get_weakproxy(void *obj, const char *tag, const char *file, int line, const char *func)
|
|
{
|
|
struct astobj2 *obj_internal = __INTERNAL_OBJ_CHECK(obj, file, line, func);
|
|
|
|
if (!obj_internal || obj_internal->priv_data.magic != AO2_MAGIC) {
|
|
/* This method is meant to be run on normal ao2 objects! */
|
|
return NULL;
|
|
}
|
|
|
|
if (!obj_internal->priv_data.weakptr) {
|
|
return NULL;
|
|
}
|
|
|
|
__ao2_ref(obj_internal->priv_data.weakptr, +1, tag, file, line, func);
|
|
return obj_internal->priv_data.weakptr;
|
|
}
|
|
|
|
int ao2_weakproxy_subscribe(void *weakproxy, ao2_weakproxy_notification_cb cb, void *data, int flags)
|
|
{
|
|
struct astobj2 *weakproxy_internal = INTERNAL_OBJ_CHECK(weakproxy);
|
|
int ret = -1;
|
|
|
|
if (!weakproxy_internal || weakproxy_internal->priv_data.magic != AO2_WEAK) {
|
|
return -1;
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_lock(weakproxy);
|
|
}
|
|
|
|
if (weakproxy_internal->priv_data.weakptr) {
|
|
struct ao2_weakproxy *weak = weakproxy;
|
|
struct ao2_weakproxy_notification *sub = ast_calloc(1, sizeof(*sub));
|
|
|
|
if (sub) {
|
|
sub->cb = cb;
|
|
sub->data = data;
|
|
AST_LIST_INSERT_HEAD(&weak->destroyed_cb, sub, list);
|
|
ret = 0;
|
|
}
|
|
} else {
|
|
cb(weakproxy, data);
|
|
ret = 0;
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_unlock(weakproxy);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ao2_weakproxy_unsubscribe(void *weakproxy, ao2_weakproxy_notification_cb destroyed_cb, void *data, int flags)
|
|
{
|
|
struct astobj2 *internal_weakproxy = INTERNAL_OBJ_CHECK(weakproxy);
|
|
struct ao2_weakproxy *weak;
|
|
struct ao2_weakproxy_notification *sub;
|
|
int ret = 0;
|
|
|
|
if (!internal_weakproxy || internal_weakproxy->priv_data.magic != AO2_WEAK || !destroyed_cb) {
|
|
return -1;
|
|
}
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_lock(weakproxy);
|
|
}
|
|
|
|
weak = weakproxy;
|
|
AST_LIST_TRAVERSE_SAFE_BEGIN(&weak->destroyed_cb, sub, list) {
|
|
if (sub->cb == destroyed_cb && sub->data == data) {
|
|
AST_LIST_REMOVE_CURRENT(list);
|
|
ast_free(sub);
|
|
ret++;
|
|
if (!(flags & OBJ_MULTIPLE)) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
AST_LIST_TRAVERSE_SAFE_END;
|
|
|
|
if (!(flags & OBJ_NOLOCK)) {
|
|
ao2_unlock(weakproxy);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
#ifdef AO2_DEBUG
|
|
static int print_cb(void *obj, void *arg, int flag)
|
|
{
|
|
struct ast_cli_args *a = (struct ast_cli_args *) arg;
|
|
char *s = (char *)obj;
|
|
|
|
ast_cli(a->fd, "string <%s>\n", s);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Print stats
|
|
*/
|
|
static char *handle_astobj2_stats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
|
|
{
|
|
switch (cmd) {
|
|
case CLI_INIT:
|
|
e->command = "astobj2 show stats";
|
|
e->usage = "Usage: astobj2 show stats\n"
|
|
" Show astobj2 show stats\n";
|
|
return NULL;
|
|
case CLI_GENERATE:
|
|
return NULL;
|
|
}
|
|
ast_cli(a->fd, "Objects : %d\n", ao2.total_objects);
|
|
ast_cli(a->fd, "Containers : %d\n", ao2.total_containers);
|
|
ast_cli(a->fd, "Memory : %d\n", ao2.total_mem);
|
|
ast_cli(a->fd, "Locked : %d\n", ao2.total_locked);
|
|
ast_cli(a->fd, "Refs : %d\n", ao2.total_refs);
|
|
return CLI_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* This is testing code for astobj
|
|
*/
|
|
static char *handle_astobj2_test(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
|
|
{
|
|
struct ao2_container *c1;
|
|
struct ao2_container *c2;
|
|
int i, lim;
|
|
char *obj;
|
|
static int prof_id = -1;
|
|
struct ast_cli_args fake_args = { a->fd, 0, NULL };
|
|
|
|
switch (cmd) {
|
|
case CLI_INIT:
|
|
e->command = "astobj2 test";
|
|
e->usage = "Usage: astobj2 test <num>\n"
|
|
" Runs astobj2 test. Creates 'num' objects,\n"
|
|
" and test iterators, callbacks and maybe other stuff\n";
|
|
return NULL;
|
|
case CLI_GENERATE:
|
|
return NULL;
|
|
}
|
|
|
|
if (a->argc != 3) {
|
|
return CLI_SHOWUSAGE;
|
|
}
|
|
|
|
if (prof_id == -1) {
|
|
prof_id = ast_add_profile("ao2_alloc", 0);
|
|
}
|
|
|
|
ast_cli(a->fd, "argc %d argv %s %s %s\n", a->argc, a->argv[0], a->argv[1], a->argv[2]);
|
|
lim = atoi(a->argv[2]);
|
|
ast_cli(a->fd, "called astobj_test\n");
|
|
|
|
handle_astobj2_stats(e, CLI_HANDLER, &fake_args);
|
|
/*
|
|
* Allocate a list container.
|
|
*/
|
|
c1 = ao2_t_container_alloc_list(AO2_ALLOC_OPT_LOCK_MUTEX, 0, NULL /* no sort */,
|
|
NULL /* no callback */, "test");
|
|
ast_cli(a->fd, "container allocated as %p\n", c1);
|
|
|
|
/*
|
|
* fill the container with objects.
|
|
* ao2_alloc() gives us a reference which we pass to the
|
|
* container when we do the insert.
|
|
*/
|
|
for (i = 0; i < lim; i++) {
|
|
ast_mark(prof_id, 1 /* start */);
|
|
obj = ao2_t_alloc(80, NULL,"test");
|
|
ast_mark(prof_id, 0 /* stop */);
|
|
ast_cli(a->fd, "object %d allocated as %p\n", i, obj);
|
|
sprintf(obj, "-- this is obj %d --", i);
|
|
ao2_link(c1, obj);
|
|
/* At this point, the refcount on obj is 2 due to the allocation
|
|
* and linking. We can go ahead and reduce the refcount by 1
|
|
* right here so that when the container is unreffed later, the
|
|
* objects will be freed
|
|
*/
|
|
ao2_t_ref(obj, -1, "test");
|
|
}
|
|
|
|
ast_cli(a->fd, "testing callbacks\n");
|
|
ao2_t_callback(c1, 0, print_cb, a, "test callback");
|
|
|
|
ast_cli(a->fd, "testing container cloning\n");
|
|
c2 = ao2_container_clone(c1, 0);
|
|
if (ao2_container_count(c1) != ao2_container_count(c2)) {
|
|
ast_cli(a->fd, "Cloned container does not have the same number of objects!\n");
|
|
}
|
|
ao2_t_callback(c2, 0, print_cb, a, "test callback");
|
|
|
|
ast_cli(a->fd, "testing iterators, remove every second object\n");
|
|
{
|
|
struct ao2_iterator ai;
|
|
int x = 0;
|
|
|
|
ai = ao2_iterator_init(c1, 0);
|
|
while ( (obj = ao2_t_iterator_next(&ai,"test")) ) {
|
|
ast_cli(a->fd, "iterator on <%s>\n", obj);
|
|
if (x++ & 1)
|
|
ao2_t_unlink(c1, obj,"test");
|
|
ao2_t_ref(obj, -1,"test");
|
|
}
|
|
ao2_iterator_destroy(&ai);
|
|
ast_cli(a->fd, "testing iterators again\n");
|
|
ai = ao2_iterator_init(c1, 0);
|
|
while ( (obj = ao2_t_iterator_next(&ai,"test")) ) {
|
|
ast_cli(a->fd, "iterator on <%s>\n", obj);
|
|
ao2_t_ref(obj, -1,"test");
|
|
}
|
|
ao2_iterator_destroy(&ai);
|
|
}
|
|
|
|
ast_cli(a->fd, "testing callbacks again\n");
|
|
ao2_t_callback(c1, 0, print_cb, a, "test callback");
|
|
|
|
ast_verbose("now you should see an error and possible assertion failure messages:\n");
|
|
ao2_t_ref(&i, -1, ""); /* i is not a valid object so we print an error here */
|
|
|
|
ast_cli(a->fd, "destroy container\n");
|
|
ao2_t_ref(c1, -1, ""); /* destroy container */
|
|
ao2_t_ref(c2, -1, ""); /* destroy container */
|
|
handle_astobj2_stats(e, CLI_HANDLER, &fake_args);
|
|
return CLI_SUCCESS;
|
|
}
|
|
#endif /* AO2_DEBUG */
|
|
|
|
#if defined(AO2_DEBUG)
|
|
static struct ast_cli_entry cli_astobj2[] = {
|
|
AST_CLI_DEFINE(handle_astobj2_stats, "Print astobj2 statistics"),
|
|
AST_CLI_DEFINE(handle_astobj2_test, "Test astobj2"),
|
|
};
|
|
#endif /* AO2_DEBUG */
|
|
|
|
static void astobj2_cleanup(void)
|
|
{
|
|
#if defined(AO2_DEBUG)
|
|
ast_cli_unregister_multiple(cli_astobj2, ARRAY_LEN(cli_astobj2));
|
|
#endif
|
|
|
|
if (ast_opt_ref_debug) {
|
|
fclose(ref_log);
|
|
ref_log = NULL;
|
|
}
|
|
}
|
|
|
|
int astobj2_init(void)
|
|
{
|
|
char ref_filename[1024];
|
|
|
|
if (ast_opt_ref_debug) {
|
|
snprintf(ref_filename, sizeof(ref_filename), "%s/refs", ast_config_AST_LOG_DIR);
|
|
ref_log = fopen(ref_filename, "w");
|
|
if (!ref_log) {
|
|
ast_log(LOG_ERROR, "Could not open ref debug log file: %s\n", ref_filename);
|
|
}
|
|
}
|
|
|
|
if (container_init() != 0) {
|
|
fclose(ref_log);
|
|
return -1;
|
|
}
|
|
|
|
#if defined(AO2_DEBUG)
|
|
ast_cli_register_multiple(cli_astobj2, ARRAY_LEN(cli_astobj2));
|
|
#endif /* defined(AO2_DEBUG) */
|
|
|
|
ast_register_cleanup(astobj2_cleanup);
|
|
|
|
return 0;
|
|
}
|