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astobj2: Support using a separate object for locking.

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Create ao2_alloc_with_lockobj function to support shared locking.

Change-Id: Iba687eb9843922be7e481e23a32c0700ecf88a80
This commit is contained in:
Corey Farrell
2016-08-26 14:18:10 -04:00
parent d3c4b901d4
commit 0c5b6e9ff5
2 changed files with 100 additions and 2 deletions
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27
include/asterisk/astobj2.h
View File

@@ -368,6 +368,13 @@ enum ao2_alloc_opts {
AO2_ALLOC_OPT_LOCK_NOLOCK = (2 << 0),
/*! The ao2 object locking option field mask. */
AO2_ALLOC_OPT_LOCK_MASK = (3 << 0),
/*!
* \internal The ao2 object uses a separate object for locking.
*
* \note This option is used internally by ao2_alloc_with_lockobj and
* should never be passed directly to ao2_alloc.
*/
AO2_ALLOC_OPT_LOCK_OBJ = AO2_ALLOC_OPT_LOCK_MASK,
};
/*!
@@ -408,6 +415,26 @@ void *__ao2_alloc(size_t data_size, ao2_destructor_fn destructor_fn, unsigned in
/*! @} */
/*!
* \since 14.1.0
* \brief Allocate and initialize an object with separate locking.
*
* \param data_size The sizeof() of the user-defined structure.
* \param destructor_fn The destructor function (can be NULL)
* \param lockobj A separate ao2 object that will provide locking.
* \param debug_msg An ao2 object debug tracing message.
* \return A pointer to user-data.
*
* \see \ref ao2_alloc for additional details.
*
* \note lockobj must be a valid AO2 object.
*/
#define ao2_alloc_with_lockobj(data_size, destructor_fn, lockobj, tag) \
__ao2_alloc_with_lockobj((data_size), (destructor_fn), (lockobj), (tag), __FILE__, __LINE__, __PRETTY_FUNCTION__)
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) attribute_warn_unused_result;
/*! \brief
* Reference/unreference an object and return the old refcount.
*

75
main/astobj2.c
View File

@@ -108,6 +108,17 @@ struct astobj2_rwlock {
void *user_data[0];
};
struct ao2_lockobj_priv {
void *lock;
};
/* AstObj2 with locking provided by a separate object. */
struct astobj2_lockobj {
struct ao2_lockobj_priv lockobj;
struct __priv_data priv_data;
void *user_data[0];
};
#ifdef AO2_DEBUG
struct ao2_stats ao2;
#endif
@@ -118,6 +129,9 @@ struct ao2_stats ao2;
#define INTERNAL_OBJ_RWLOCK(user_data) \
((struct astobj2_rwlock *) (((char *) (user_data)) - sizeof(struct astobj2_rwlock)))
#define INTERNAL_OBJ_LOCKOBJ(user_data) \
((struct astobj2_lockobj *) (((char *) (user_data)) - sizeof(struct astobj2_lockobj)))
#define INTERNAL_OBJ(user_data) \
(struct astobj2 *) ((char *) user_data - sizeof(struct astobj2))
@@ -187,6 +201,7 @@ int __ao2_lock(void *user_data, enum ao2_lock_req lock_how, const char *file, co
struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
struct astobj2_lock *obj_mutex;
struct astobj2_rwlock *obj_rwlock;
struct astobj2_lockobj *obj_lockobj;
int res = 0;
if (obj == NULL) {
@@ -231,6 +246,10 @@ int __ao2_lock(void *user_data, enum ao2_lock_req lock_how, const char *file, co
case AO2_ALLOC_OPT_LOCK_NOLOCK:
/* The ao2 object has no lock. */
break;
case AO2_ALLOC_OPT_LOCK_OBJ:
obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
res = __ao2_lock(obj_lockobj->lockobj.lock, lock_how, file, func, line, var);
break;
default:
ast_log(__LOG_ERROR, file, line, func, "Invalid lock option on ao2 object %p\n",
user_data);
@@ -245,6 +264,7 @@ int __ao2_unlock(void *user_data, const char *file, const char *func, int line,
struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
struct astobj2_lock *obj_mutex;
struct astobj2_rwlock *obj_rwlock;
struct astobj2_lockobj *obj_lockobj;
int res = 0;
int current_value;
@@ -281,6 +301,10 @@ int __ao2_unlock(void *user_data, const char *file, const char *func, int line,
case AO2_ALLOC_OPT_LOCK_NOLOCK:
/* The ao2 object has no lock. */
break;
case AO2_ALLOC_OPT_LOCK_OBJ:
obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
res = __ao2_unlock(obj_lockobj->lockobj.lock, file, func, line, var);
break;
default:
ast_log(__LOG_ERROR, file, line, func, "Invalid lock option on ao2 object %p\n",
user_data);
@@ -295,6 +319,7 @@ int __ao2_trylock(void *user_data, enum ao2_lock_req lock_how, const char *file,
struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
struct astobj2_lock *obj_mutex;
struct astobj2_rwlock *obj_rwlock;
struct astobj2_lockobj *obj_lockobj;
int res = 0;
if (obj == NULL) {
@@ -339,6 +364,10 @@ int __ao2_trylock(void *user_data, enum ao2_lock_req lock_how, const char *file,
case AO2_ALLOC_OPT_LOCK_NOLOCK:
/* The ao2 object has no lock. */
return 0;
case AO2_ALLOC_OPT_LOCK_OBJ:
obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
res = __ao2_trylock(obj_lockobj->lockobj.lock, lock_how, file, func, line, var);
break;
default:
ast_log(__LOG_ERROR, file, line, func, "Invalid lock option on ao2 object %p\n",
user_data);
@@ -370,6 +399,7 @@ enum ao2_lock_req __adjust_lock(void *user_data, enum ao2_lock_req lock_how, int
{
struct astobj2 *obj = INTERNAL_OBJ(user_data);
struct astobj2_rwlock *obj_rwlock;
struct astobj2_lockobj *obj_lockobj;
enum ao2_lock_req orig_lock;
switch (obj->priv_data.options & AO2_ALLOC_OPT_LOCK_MASK) {
@@ -400,6 +430,10 @@ enum ao2_lock_req __adjust_lock(void *user_data, enum ao2_lock_req lock_how, int
break;
}
break;
case AO2_ALLOC_OPT_LOCK_OBJ:
obj_lockobj = INTERNAL_OBJ_LOCKOBJ(user_data);
orig_lock = __adjust_lock(obj_lockobj->lockobj.lock, lock_how, keep_stronger);
break;
default:
ast_log(LOG_ERROR, "Invalid lock option on ao2 object %p\n", user_data);
/* Fall through */
@@ -441,6 +475,7 @@ int __ao2_ref(void *user_data, int delta,
struct astobj2 *obj = __INTERNAL_OBJ_CHECK(user_data, file, line, func);
struct astobj2_lock *obj_mutex;
struct astobj2_rwlock *obj_rwlock;
struct astobj2_lockobj *obj_lockobj;
int current_value;
int ret;
void *weakproxy = NULL;
@@ -552,6 +587,12 @@ int __ao2_ref(void *user_data, int delta,
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);
@@ -581,13 +622,14 @@ void __ao2_cleanup(void *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)
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:
@@ -614,6 +656,22 @@ void *__ao2_alloc(size_t data_size, ao2_destructor_fn destructor_fn, unsigned in
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");
@@ -643,6 +701,19 @@ void *__ao2_alloc(size_t data_size, ao2_destructor_fn destructor_fn, unsigned in
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;