int
bufferevent_enable_locking(struct bufferevent *bufev, void *lock)
{
#ifdef _EVENT_DISABLE_THREAD_SUPPORT
return -1;
#else
struct bufferevent *underlying;
if (BEV_UPCAST(bufev)->lock)
return -1;
underlying = bufferevent_get_underlying(bufev);
if (!lock && underlying && BEV_UPCAST(underlying)->lock) {
lock = BEV_UPCAST(underlying)->lock;
BEV_UPCAST(bufev)->lock = lock;
BEV_UPCAST(bufev)->own_lock = 0;
} else if (!lock) {
EVTHREAD_ALLOC_LOCK(lock, EVTHREAD_LOCKTYPE_RECURSIVE);
if (!lock)
return -1;
BEV_UPCAST(bufev)->lock = lock;
BEV_UPCAST(bufev)->own_lock = 1;
} else {
BEV_UPCAST(bufev)->lock = lock;
BEV_UPCAST(bufev)->own_lock = 0;
}
evbuffer_enable_locking(bufev->input, lock);
evbuffer_enable_locking(bufev->output, lock);
if (underlying && !BEV_UPCAST(underlying)->lock)
bufferevent_enable_locking(underlying, lock);
return 0;
#endif
}
static struct bufferevent *
tor_get_root_bufferevent(struct bufferevent *bev)
{
struct bufferevent *u;
while ((u = bufferevent_get_underlying(bev)) != NULL)
bev = u;
return bev;
}
void
_bufferevent_decref_and_unlock(struct bufferevent *bufev)
{
struct bufferevent_private *bufev_private =
EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
struct bufferevent *underlying;
if (--bufev_private->refcnt) {
BEV_UNLOCK(bufev);
return;
}
underlying = bufferevent_get_underlying(bufev);
/* Clean up the shared info */
if (bufev->be_ops->destruct)
bufev->be_ops->destruct(bufev);
/* XXX what happens if refcnt for these buffers is > 1?
* The buffers can share a lock with this bufferevent object,
* but the lock might be destroyed below. */
/* evbuffer will free the callbacks */
evbuffer_free(bufev->input);
evbuffer_free(bufev->output);
if (bufev_private->rate_limiting) {
if (bufev_private->rate_limiting->group)
bufferevent_remove_from_rate_limit_group(bufev);
if (event_initialized(&bufev_private->rate_limiting->refill_bucket_event))
event_del(&bufev_private->rate_limiting->refill_bucket_event);
event_debug_unassign(&bufev_private->rate_limiting->refill_bucket_event);
mm_free(bufev_private->rate_limiting);
bufev_private->rate_limiting = NULL;
}
event_debug_unassign(&bufev->ev_read);
event_debug_unassign(&bufev->ev_write);
BEV_UNLOCK(bufev);
if (bufev_private->own_lock)
EVTHREAD_FREE_LOCK(bufev_private->lock,
EVTHREAD_LOCKTYPE_RECURSIVE);
/* Free the actual allocated memory. */
mm_free(bufev - bufev->be_ops->mem_offset);
/* release the reference to underlying now that we no longer need
* the reference to it. This is mainly in case our lock is shared
* with underlying.
* XXX Should we/can we just refcount evbuffer/bufferevent locks?
* It would probably save us some headaches.
*/
if (underlying)
bufferevent_decref(underlying);
}
static void
bufferevent_finalize_cb_(struct event_callback *evcb, void *arg_)
{
struct bufferevent *bufev = arg_;
struct bufferevent *underlying;
struct bufferevent_private *bufev_private =
EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
BEV_LOCK(bufev);
underlying = bufferevent_get_underlying(bufev);
/* Clean up the shared info */
if (bufev->be_ops->destruct)
bufev->be_ops->destruct(bufev);
/* XXX what happens if refcnt for these buffers is > 1?
* The buffers can share a lock with this bufferevent object,
* but the lock might be destroyed below. */
/* evbuffer will free the callbacks */
evbuffer_free(bufev->input);
evbuffer_free(bufev->output);
if (bufev_private->rate_limiting) {
if (bufev_private->rate_limiting->group)
bufferevent_remove_from_rate_limit_group_internal_(bufev,0);
mm_free(bufev_private->rate_limiting);
bufev_private->rate_limiting = NULL;
}
BEV_UNLOCK(bufev);
if (bufev_private->own_lock)
EVTHREAD_FREE_LOCK(bufev_private->lock,
EVTHREAD_LOCKTYPE_RECURSIVE);
/* Free the actual allocated memory. */
mm_free(((char*)bufev) - bufev->be_ops->mem_offset);
/* Release the reference to underlying now that we no longer need the
* reference to it. We wait this long mainly in case our lock is
* shared with underlying.
*
* The 'destruct' function will also drop a reference to underlying
* if BEV_OPT_CLOSE_ON_FREE is set.
*
* XXX Should we/can we just refcount evbuffer/bufferevent locks?
* It would probably save us some headaches.
*/
if (underlying)
bufferevent_decref_(underlying);
}