I'd love to see a linux style way of saying "I'd like to sleep from roughly this time interval to this time interval; feel free to do what you need."
Then yes, it could be implemented as a sleep wakeup from a timer, or as a call to a hypervisor to do the same, or .. or... -adrian On 7 October 2013 13:26, Ian Lepore <i...@freebsd.org> wrote: > On Mon, 2013-10-07 at 13:15 -0700, Adrian Chadd wrote: > > Hi, > > > > You should add: > > > > *[snip] > > * a DELAY(1) or something. > > > > Why? Why oh why do people write > > while (!read_some_status_register()) > DELAY(n); > > when DELAY() is implemented as, roughly: > > while (read_some_counter_register() < something) > continue; > > The whole point of DELAY() is to busy-wait. > > What might be nice is some function that we can call in such a loop such > as cpu_busywait(), so that when running in an emulated or virtualized > environment the emulator or hypervisor could use that as a hint to do > something smart. > > -- Ian > > > _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
