luasocket.select([, timeout]), the param timeout can't support "microseconds"

[lin_style <0xtiger2009@...>]

the function "select" source code in luasocket:

typedef struct t_timeout_ {

    double block;          /* maximum time for blocking calls */

    double total;          /* total number of miliseconds for operation */

    double start;          /* time of start of operation */

} t_timeout;

void timeout_init(p_timeout tm, double block, double total) {

    tm->block = block;

    tm->total = total;

}

static int global_select(lua_State *L) {

    timeout_init(&tm, t, -1);  //oh,,-1!!!

}

it's not support.