php_pgsql - threadsafe?

Hi all, Last week I found the php_pgsql extension wouldn't work on IIS6, windows server 2003, using php isapi. PHP was running fine, and I'm 99% certain the extension was loaded, extension_loaded() returned true and a call to pg_connect produced no error messages, but no connection either. No error messages were produced at all. When the extension was not loaded I got the usual pg_connect() undefined message. I eventually got it running using fastcgi - which can run non-threadsafe php on multithreaded web servers. Was I doing anything wrong? Is php_pgsql threadsafe? Is this usual behaviour? In which case I'm going to abandon pgsql for pdo - I thought I was going to have to rewrite my entire application about 3 days from the deadline 'til it worked (hours of hair-tearing later) with fastcgi. Thanks Will