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    SubjectRe: [RFC] Driver writer's guide to sleeping
    Date
    On Saturday 25 June 2005 14:29, Oliver Neukum wrote:
    > On Sat, 25 Jun 2005, Denis Vlasenko wrote:
    >
    > > schedule_timeout(timeout)
    > > Whee, it has a comment! :)
    > > * %TASK_UNINTERRUPTIBLE - at least @timeout jiffies are guaranteed to
    > > * pass before the routine returns. The routine will return 0
    [snip]
    > > Thus:
    > > set_current_state(TASK_[UN]INTERRUPTIBLE);
    > > schedule_timeout(timeout_in_jiffies)
    > >
    > > msleep(ms)
    > > Sleeps at least ms msecs.
    > > Equivalent to:
    > > set_current_state(TASK_UNINTERRUPTIBLE);
    > > schedule_timeout(timeout)
    >
    > If and only if you are not on any waitqueue. You may not be interrupted
    > by a signal, but you still can be woken with an explicit wake_up()

    Like this?
    --
    vda

    --- linux-2.6.12.src/kernel/timer.c.orig Sun Jun 19 16:11:00 2005
    +++ linux-2.6.12.src/kernel/timer.c Sat Jun 25 14:50:22 2005
    @@ -1059,12 +1059,16 @@ static void process_timeout(unsigned lon
    *
    * You can set the task state as follows -
    *
    - * %TASK_UNINTERRUPTIBLE - at least @timeout jiffies are guaranteed to
    - * pass before the routine returns. The routine will return 0
    + * %TASK_UNINTERRUPTIBLE - at least @timeout jiffies will pass
    + * before the routine returns, unless something explicitly
    + * wakes you up with wake_up_process(). Signals won't interrupt
    + * such sleep.
    *
    * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
    - * delivered to the current task. In this case the remaining time
    - * in jiffies will be returned, or 0 if the timer expired in time
    + * delivered to the current task.
    + *
    + * The remaining time in jiffies will be returned, or 0 if the timer
    + * expired in time.
    *
    * The current task state is guaranteed to be TASK_RUNNING when this
    * routine returns.
    -
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