Function start_xact_command

src/backend/tcop/postgres.c:3552–3578

* Convenience routines for starting/committing a single command. */

 * Convenience routines for starting/committing a single command.
 */
static void
start_xact_command(void)
{
	if (!xact_started)
	{
		StartTransactionCommand();

		xact_started = true;
	}

	/*
	 * Start statement timeout if necessary.  Note that this'll intentionally
	 * not reset the clock on an already started timeout, to avoid the timing
	 * overhead when start_xact_command() is invoked repeatedly, without an
	 * interceding finish_xact_command() (e.g. parse/bind/execute).  If that's
	 * not desired, the timeout has to be disabled explicitly.
	 */
	enable_statement_timeout();

	/* Start timeout for checking if the client has gone away if necessary. */
	if (client_connection_check_interval > 0 &&
		IsUnderPostmaster &&
		MyProcPort &&
		!get_timeout_active(CLIENT_CONNECTION_CHECK_TIMEOUT))
		enable_timeout_after(CLIENT_CONNECTION_CHECK_TIMEOUT,
							 client_connection_check_interval);
}

static void
finish_xact_command(void)