static int
kobj_class_compile1(kobj_class_t cls, int mflags)
{
kobj_ops_t ops;
KOBJ_ASSERT(MA_NOTOWNED);
ops = malloc(sizeof(struct kobj_ops), M_KOBJ, mflags);
if (ops == NULL)
return (ENOMEM);
/*
* We may have lost a race for kobj_class_compile here - check
* to make sure someone else hasn't already compiled this
* class.
*/
KOBJ_LOCK();
if (cls->ops) {
KOBJ_UNLOCK();
free(ops, M_KOBJ);
return (0);
}
kobj_class_compile_common(cls, ops);
KOBJ_UNLOCK();
return (0);
}
void
kobj_init(kobj_t obj, kobj_class_t cls)
{
KOBJ_ASSERT(MA_NOTOWNED);
retry:
KOBJ_LOCK();
/*
* Consider compiling the class' method table.
*/
if (!cls->ops) {
/*
* kobj_class_compile doesn't want the lock held
* because of the call to malloc - we drop the lock
* and re-try.
*/
KOBJ_UNLOCK();
kobj_class_compile(cls);
goto retry;
}
kobj_init_common(obj, cls);
KOBJ_UNLOCK();
}
void
kobj_class_compile(kobj_class_t cls)
{
kobj_ops_t ops;
KOBJ_ASSERT(MA_NOTOWNED);
/*
* Allocate space for the compiled ops table.
*/
ops = malloc(sizeof(struct kobj_ops), M_KOBJ, M_NOWAIT);
if (!ops)
panic("%s: out of memory", __func__);
KOBJ_LOCK();
/*
* We may have lost a race for kobj_class_compile here - check
* to make sure someone else hasn't already compiled this
* class.
*/
if (cls->ops) {
KOBJ_UNLOCK();
free(ops, M_KOBJ);
return;
}
kobj_class_compile_common(cls, ops);
KOBJ_UNLOCK();
}
void
kobj_class_free(kobj_class_t cls)
{
void* ops = NULL;
KOBJ_ASSERT(MA_NOTOWNED);
KOBJ_LOCK();
/*
* Protect against a race between kobj_create and
* kobj_delete.
*/
if (cls->refs == 0) {
/*
* For now we don't do anything to unregister any methods
* which are no longer used.
*/
/*
* Free memory and clean up.
*/
ops = cls->ops;
cls->ops = NULL;
}
KOBJ_UNLOCK();
if (ops)
free(ops, M_KOBJ);
}
void
kobj_class_free(kobj_class_t cls)
{
int i;
kobj_method_t *m;
void* ops = NULL;
KOBJ_ASSERT(MA_NOTOWNED);
KOBJ_LOCK();
/*
* Protect against a race between kobj_create and
* kobj_delete.
*/
if (cls->refs == 0) {
/*
* Unregister any methods which are no longer used.
*/
for (i = 0, m = cls->methods; m->desc; i++, m++)
kobj_unregister_method(m->desc);
/*
* Free memory and clean up.
*/
ops = cls->ops;
cls->ops = NULL;
}
KOBJ_UNLOCK();
if (ops)
free(ops, M_KOBJ);
}
static int
kobj_init1(kobj_t obj, kobj_class_t cls, int mflags)
{
int error;
KOBJ_LOCK();
while (cls->ops == NULL) {
/*
* kobj_class_compile doesn't want the lock held
* because of the call to malloc - we drop the lock
* and re-try.
*/
KOBJ_UNLOCK();
error = kobj_class_compile1(cls, mflags);
if (error != 0)
return (error);
KOBJ_LOCK();
}
kobj_init_common(obj, cls);
KOBJ_UNLOCK();
return (0);
}
void
kobj_class_compile_static(kobj_class_t cls, kobj_ops_t ops)
{
KOBJ_ASSERT(MA_NOTOWNED);
/*
* Increment refs to make sure that the ops table is not freed.
*/
KOBJ_LOCK();
cls->refs++;
kobj_class_compile_common(cls, ops);
KOBJ_UNLOCK();
}
void
kobj_delete(kobj_t obj, struct malloc_type *mtype)
{
kobj_class_t cls = obj->ops->cls;
int refs;
/*
* Consider freeing the compiled method table for the class
* after its last instance is deleted. As an optimisation, we
* should defer this for a short while to avoid thrashing.
*/
KOBJ_ASSERT(MA_NOTOWNED);
KOBJ_LOCK();
cls->refs--;
refs = cls->refs;
KOBJ_UNLOCK();
if (!refs)
kobj_class_free(cls);
obj->ops = NULL;
if (mtype)
free(obj, mtype);
}