/*
* Return port event back to the kmem_cache.
* If the event is currently in the port queue the event itself will only
* be set as invalid. The port_get(n) function will not deliver such events
* to the application and it will return them back to the kmem_cache.
*/
void
port_free_event(port_kevent_t *pkevp)
{
port_queue_t *portq;
port_t *pp;
pp = pkevp->portkev_port;
if (pp == NULL)
return;
if (pkevp->portkev_flags & PORT_ALLOC_PRIVATE) {
port_free_event_local(pkevp, 0);
return;
}
portq = &pp->port_queue;
mutex_enter(&portq->portq_mutex);
port_block(portq);
if (pkevp->portkev_flags & PORT_KEV_DONEQ) {
pkevp->portkev_flags |= PORT_KEV_FREE;
pkevp->portkev_callback = NULL;
port_unblock(portq);
mutex_exit(&portq->portq_mutex);
return;
}
port_unblock(portq);
if (pkevp->portkev_flags & PORT_KEV_CACHED) {
mutex_exit(&portq->portq_mutex);
return;
}
if (--pp->port_curr < pp->port_max_events)
cv_signal(&pp->port_cv);
if (portq->portq_flags & PORTQ_CLOSE) {
/*
* Another thread is closing the event port.
* That thread will sleep until all allocated event
* structures returned to the event port framework.
* The portq_mutex is used to synchronize the status
* of the allocated event structures (port_curr).
*/
if (pp->port_curr <= portq->portq_nent)
cv_signal(&portq->portq_closecv);
}
mutex_exit(&portq->portq_mutex);
port_free_event_local(pkevp, 1);
}
/*
* Remove the fd from the event port cache.
*/
static void
port_remove_fd_local(portfd_t *pfd, port_fdcache_t *pcp)
{
polldat_t *pdp = PFTOD(pfd);
ASSERT(MUTEX_HELD(&pcp->pc_lock));
pdp->pd_fp = NULL;
if (pdp->pd_php != NULL) {
pollhead_delete(pdp->pd_php, pdp);
pdp->pd_php = NULL;
}
port_free_event_local(pdp->pd_portev, 0);
/* remove polldat struct */
port_pcache_remove_fd(pcp, pfd);
}
/*
* The port_remove_fd_object() function frees all resources associated with
* delivered portfd_t structure. Returns 1 if the port_kevent was found
* and removed from the port queue.
*/
int
port_remove_fd_object(portfd_t *pfd, port_t *pp, port_fdcache_t *pcp)
{
port_queue_t *portq;
polldat_t *pdp = PFTOD(pfd);
port_kevent_t *pkevp;
int error;
int removed = 0;
ASSERT(MUTEX_HELD(&pcp->pc_lock));
if (pdp->pd_php != NULL) {
pollhead_delete(pdp->pd_php, pdp);
pdp->pd_php = NULL;
}
pkevp = pdp->pd_portev;
portq = &pp->port_queue;
mutex_enter(&portq->portq_mutex);
port_block(portq);
if (pkevp->portkev_flags & PORT_KEV_DONEQ) {
if (portq->portq_getn && portq->portq_tnent) {
/*
* move events from the temporary "get" queue
* back to the port queue
*/
port_push_eventq(portq);
}
/* cleanup merged port queue */
port_remove_event_doneq(pkevp, portq);
removed = 1;
}
port_unblock(portq);
mutex_exit(&portq->portq_mutex);
if (pkevp->portkev_callback) {
(void) (*pkevp->portkev_callback)(pkevp->portkev_arg,
&error, pkevp->portkev_pid, PORT_CALLBACK_DISSOCIATE,
pkevp);
}
port_free_event_local(pkevp, 0);
/* remove polldat struct */
port_pcache_remove_fd(pcp, pfd);
return (removed);
}
