Function tsd_destroy

freebsd/contrib/openzfs/module/os/linux/spl/spl-tsd.c:587–639

* tsd_destroy - destroy thread specific data * @keyp: lookup key address * * Destroys the thread specific data on all threads which use this key. * * Caller must prevent racing tsd_set() or tsd_get(), this function is * safe from racing tsd_create(), tsd_destroy(), and tsd_exit(). */

 * safe from racing tsd_create(), tsd_destroy(), and tsd_exit().
 */
void
tsd_destroy(uint_t *keyp)
{
	HLIST_HEAD(work);
	tsd_hash_table_t *table;
	tsd_hash_entry_t *dtor_entry, *entry;
	tsd_hash_bin_t *dtor_entry_bin, *entry_bin;
	ulong_t hash;

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

	spin_lock(&table->ht_lock);
	dtor_entry = tsd_hash_search(table, *keyp, DTOR_PID);
	if (dtor_entry == NULL) {
		spin_unlock(&table->ht_lock);
		return;
	}

	/*
	 * All threads which use this key must be linked off of the
	 * DTOR_PID entry.  They are removed from the hash table and
	 * linked in to a private working list to be destroyed.
	 */
	while (!list_empty(&dtor_entry->he_key_list)) {
		entry = list_entry(dtor_entry->he_key_list.next,
		    tsd_hash_entry_t, he_key_list);
		ASSERT3U(dtor_entry->he_key, ==, entry->he_key);
		ASSERT3P(dtor_entry->he_dtor, ==, entry->he_dtor);

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

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

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

	spin_lock(&dtor_entry_bin->hb_lock);
	tsd_hash_del(table, dtor_entry);
	hlist_add_head(&dtor_entry->he_list, &work);
	spin_unlock(&dtor_entry_bin->hb_lock);
	spin_unlock(&table->ht_lock);

	tsd_hash_dtor(&work);
	*keyp = 0;
}
EXPORT_SYMBOL(tsd_destroy);

/*