</para>

</warning>

<note>

<para>

On Windows, there is a way to improve performance if a single

database connection is repeatedly started and shutdown. Internally,

libpq calls <function>WSAStartup()</function> and <function>WSACleanup()</function> for connection startup

and shutdown, respectively. <function>WSAStartup()</function> increments an internal

Windows library reference count which is decremented by <function>WSACleanup()</function>.

When the reference count is just one, calling <function>WSACleanup()</function> frees

all resources and all DLLs are unloaded. This is an expensive

operation. To avoid this, an application can manually call

<function>WSAStartup()</function> so resources will not be freed when the last database

connection is closed.

</para>

</note>

<variablelist>

<varlistentry id="libpq-pqconnectdbparams">

<term><function>PQconnectdbParams</function><indexterm><primary>PQconnectdbParams</primary></indexterm></term>

(strncmp(msg, prefix, strlen(prefix)) == 0)

shutdown_parallel_dump_utils(intcode,void*unused)

{

if (mainThreadId==GetCurrentThreadId())

WSACleanup();

}

pg_log_error("WSAStartup failed: %d",err);

exit_nicely(1);

}

on_exit_nicely(shutdown_parallel_dump_utils,NULL);

parallel_init_done= true;

}

WSADATAwsaData;

staticboolwsastartup_done= false;

if (WSAStartup(MAKEWORD(1,1),&wsaData))

returnNULL;

if (!wsastartup_done)

{

WSADATAwsaData;

if (WSAStartup(MAKEWORD(1,1),&wsaData)!=0)

returnNULL;

wsastartup_done= true;

}

WSASetLastError(0);

conn= (PGconn*)malloc(sizeof(PGconn));

if (conn==NULL)

{

WSACleanup();

returnconn;

}

MemSet(conn,0,sizeof(PGconn));

termPQExpBuffer(&conn->workBuffer);

free(conn);

WSACleanup();

}