/*
* This routine inserts a polldat into the portcache's hash table. It
* may be necessary to grow the size of the hash table.
*/
static void
port_cache_insert_fd(port_fdcache_t *pcp, polldat_t *pdp)
{
portfd_t **bucket;
ASSERT(MUTEX_HELD(&pcp->pc_lock));
if (pcp->pc_fdcount > (pcp->pc_hashsize * PORTHASH_MULT))
port_cache_grow_hashtbl(pcp);
bucket = PORT_FD_BUCKET(pcp, pdp->pd_fd);
pdp->pd_hashnext = PFTOD(*bucket);
*bucket = PDTOF(pdp);
pcp->pc_fdcount++;
}
/*
* This routine returns a pointer to a cached poll fd entry, or NULL if it
* does not find it in the hash table.
* The fd is used as index.
* The fd and the fp are used to detect a valid entry.
* This function returns a pointer to a valid portfd_t structure only when
* the fd and the fp in the args match the entries in polldat_t.
*/
portfd_t *
port_cache_lookup_fp(port_fdcache_t *pcp, int fd, file_t *fp)
{
polldat_t *pdp;
portfd_t **bucket;
ASSERT(MUTEX_HELD(&pcp->pc_lock));
bucket = PORT_FD_BUCKET(pcp, fd);
pdp = PFTOD(*bucket);
while (pdp != NULL) {
if (pdp->pd_fd == fd && pdp->pd_fp == fp)
break;
pdp = pdp->pd_hashnext;
}
return (PDTOF(pdp));
}
/*
* This routine removes a portfd_t from the fd cache's hash table.
*/
void
port_pcache_remove_fd(port_fdcache_t *pcp, portfd_t *pfd)
{
polldat_t *lpdp;
polldat_t *cpdp;
portfd_t **bucket;
polldat_t *pdp = PFTOD(pfd);
ASSERT(MUTEX_HELD(&pcp->pc_lock));
bucket = PORT_FD_BUCKET(pcp, pdp->pd_fd);
cpdp = PFTOD(*bucket);
if (pdp == cpdp) {
*bucket = PDTOF(pdp->pd_hashnext);
if (--pcp->pc_fdcount == 0) {
/*
* signal the thread which may have blocked in
* port_close_sourcefd() on lastclose waiting
* for pc_fdcount to drop to 0.
*/
cv_signal(&pcp->pc_lclosecv);
}
kmem_free(pfd, sizeof (portfd_t));
return;
}
while (cpdp != NULL) {
lpdp = cpdp;
cpdp = cpdp->pd_hashnext;
if (cpdp == pdp) {
/* polldat struct found */
lpdp->pd_hashnext = pdp->pd_hashnext;
if (--pcp->pc_fdcount == 0) {
/*
* signal the thread which may have blocked in
* port_close_sourcefd() on lastclose waiting
* for pc_fdcount to drop to 0.
*/
cv_signal(&pcp->pc_lclosecv);
}
break;
}
}
ASSERT(cpdp != NULL);
kmem_free(pfd, sizeof (portfd_t));
}