Re: [take24 0/6] kevent: Generic event handling mechanism.

Michael Tokarev
2006-11-22T11:39:00Z

Ulrich Drepper wrote:
> Jeff Garzik wrote:
>> I think we have lived with relative timeouts for so long, it would be
>> unusual to change now. select(2), poll(2), epoll_wait(2) all take
>> relative timeouts.
>
> I'm not talking about always using absolute timeouts.
>
> I'm saying the timeout parameter should be a struct timespec* and then
> the flags word could have a flag meaning "this is an absolute timeout".
> I.e., enable both uses,, even make relative timeouts the default. This
> is what the modern POSIX interfaces do, too, see clock_nanosleep.

Can't the argument be something like u64 instead of struct timespec,
regardless of this discussion (relative vs absolute)?

Compare:

void mysleep(int msec) {
struct timeval tv;
tv.tv_sec = msec/1000;
tv.tv_usec = msec%1000;
select(0,0,0,0,&tv);
}

with

void mysleep(int msec) {
poll(0, 0, msec*SOME_TIME_SCALE_VALUE);
}

That to say: struct time{spec,val,whatever} is more difficult to use than
plain numbers.

But yes... existing struct timespec has an advantage of being already existed.
Oh well.

/mjt