Function tsd_remove_entry

freebsd/contrib/openzfs/module/os/linux/spl/spl-tsd.c:400–445

* tsd_remove_entry - remove a tsd entry for this thread * @entry: entry to remove * * Remove the thread specific data @entry for this thread. * If this is the last entry for this thread, also remove the PID entry. */

 * If this is the last entry for this thread, also remove the PID entry.
 */
static void
tsd_remove_entry(tsd_hash_entry_t *entry)
{
	HLIST_HEAD(work);
	tsd_hash_table_t *table;
	tsd_hash_entry_t *pid_entry;
	tsd_hash_bin_t *pid_entry_bin, *entry_bin;
	ulong_t hash;

	table = tsd_hash_table;
	ASSERT3P(table, !=, NULL);
	ASSERT3P(entry, !=, NULL);

	spin_lock(&table->ht_lock);

	hash = hash_long((ulong_t)entry->he_key *
	    (ulong_t)entry->he_pid, table->ht_bits);
	entry_bin = &table->ht_bins[hash];

	/* save the possible pid_entry */
	pid_entry = list_entry(entry->he_pid_list.next, tsd_hash_entry_t,
	    he_pid_list);

	/* remove entry */
	spin_lock(&entry_bin->hb_lock);
	tsd_hash_del(table, entry);
	hlist_add_head(&entry->he_list, &work);
	spin_unlock(&entry_bin->hb_lock);

	/* if pid_entry is indeed pid_entry, then remove it if it's empty */
	if (pid_entry->he_key == PID_KEY &&
	    list_empty(&pid_entry->he_pid_list)) {
		hash = hash_long((ulong_t)pid_entry->he_key *
		    (ulong_t)pid_entry->he_pid, table->ht_bits);
		pid_entry_bin = &table->ht_bins[hash];

		spin_lock(&pid_entry_bin->hb_lock);
		tsd_hash_del(table, pid_entry);
		hlist_add_head(&pid_entry->he_list, &work);
		spin_unlock(&pid_entry_bin->hb_lock);
	}

	spin_unlock(&table->ht_lock);

	tsd_hash_dtor(&work);
}

/*
 * tsd_set - set thread specific data