how to set timer?

[supergui]

//////////////////////////////////////////////////////////////////////////////////////////////////////////
gdrive_timer_wev.handler=test_timer;
ngx_add_timer(&gdrive_timer_wev, 5); 

static
void test_timer(ngx_event_t *wev)
{
        ngx_log_error(NGX_LOG_DEBUG, wev->log, 0, "timer out");
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////

i want to set a timer in nginx's main loop, but why this make not any effect?
how to set the timer?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,4265,4265#msg-4265