
or the key has been deleted</SPAN>. The order in which destructor
functions are called at thread termination time is unspecified. 
</P>
<P>Before the destructor function is called, the <B>NULL</B> value is
associated with the key in the current thread. A destructor function
might, however, re-associate non- <B>NULL</B> values to that key or
some other key. To deal with this, if after all the destructors have
been called for all non- <B>NULL</B> values, there are still some
non- <B>NULL</B> values with asso