quick ECPG doco change

Hi, this doco patch is a quick one to add explicit mention of the need for the
AT clause in threaded ECPG applications. Does this sound okay?

Bruce, yes, I do intend to contribute more than this, but at least this will
stop some confusion in the meantime.

Regards, Philip Yarra.

Index: ecpg.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql-server/doc/src/sgml/ecpg.sgml,v
retrieving revision 1.54
diff -c -r1.54 ecpg.sgml
*** ecpg.sgml 12 Nov 2003 22:47:47 -0000 1.54
--- ecpg.sgml 18 Nov 2003 23:20:51 -0000
***************
*** 353,358 ****
--- 353,365 ----
</programlisting>
This option is particularly suitable if the application needs to
use several connections in mixed order.
+ </para>
+
+ <para>
+ If your application uses multiple threads of execution, they cannot
share a
+ connection concurrently. You must either explicitly control access to
the connection
+ (using mutexes) or use a connection for each thread. If each thread
uses its own connection,
+ you will need to use the AT clause to specify which connection the
thread will use.
</para>

<para>

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