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    SubjectRe: Synchronous signal delivery..
    Davide Libenzi <> writes:

    > On Thu, 13 Feb 2003, Linus Torvalds wrote:
    > > > > One of the reasons for the "flags" field (which is not unused) was because
    > > > > I thought it might have extensions for things like alarms etc.
    > > >
    > > > I was thinking more like :
    > > >
    > > > int timerfd(int timeout, int oneshot);
    > >
    > > It could be a separate system call, ...
    > I would personally like it a lot to have timer events available on
    > pollable fds. Am I alone in this ?

    Think of "timer events" as a single TCP connection, so you have...

    time X: empty
    time X+Y: timed event "Arrives"
    time X+Z: timed event "Arrives" which point it's pretty obvious that if you "poll" the timer
    event queue from anytime before X+Y it'll be empty, and anytime after
    X+Y it'll be "full". There isn't any point in being able to distinguish
    between the events X+Y and X+Z, you only need to know a timed event has
    occurred so you should process all timed events that are needed.
    At which point you just need to work out the difference between X and
    X+Y, and pass that to poll/sigtimedwait/etc.

    # James Antill --
    * ^From: .*james@and\.org
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