Chu, Zhenwei wrote:
> Yes, it is lwIP 1.3.0. timeout is set to 0, and timeout->tv_sec = 0
> and timeout->tv_usec=0. The section of code from sockets.c is copied
> here.
I was wondering how you called lwip_select, not the code that's called.
> lwip_select()
> {
> ....
>
> /* add our semaphore to list */
> /* We don't actually need any dynamic memory. Our entry on the
> * list is only valid while we are in this function, so it's ok
> * to use local variables */
>
> select_cb.sem = sys_sem_new(0);
[snip]
But the code that deals with not blocking is in the bit you have cut out
with "....".
As Rishi said, the bit that starts:
/* If we don't have any current events, then suspend if we are supposed to */
if (!nready) {
if (timeout && timeout->tv_sec == 0 && timeout->tv_usec == 0) {
is the bit which means that lwip_select does not block if the timeout
duration is 0.
Jifl
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