s are normally read-only after creation,
   and so can be passed around freely between threads.  However, if you use
   any of the <TT
CLASS="STRUCTNAME"
>PGresult</TT
>-modifying functions described in
   <A
HREF="libpq-misc.html"
>Section 31.11</A
> or <A
HREF="libpq-events.html"
>Section 31.13</A
>, it's up
   to you to avoid concurrent operations on the same <TT
CLASS="STRUCTNAME"
>PGresult</TT
>,
   too.
  </P
><P
>   The deprecated functions <CODE
CLASS="FUNCTION"
>PQrequestCancel</CODE
> and
   <CODE