On 6/25/05, Denis Vlasenko <[email protected]> wrote:
> Hi folks,
>
> I'm working on a Linux wireless driver.
>
> I compiled a little guide for myself about waiting primitives.
> I would appreciate if you look thru it. Maybe I'm wrong somewhere.
<snip>
> schedule_timeout(timeout)
<snip>
> msleep(ms)
<snip>
> msleep_interruptible(ms)
<snip>
So, there are four cases in the schedule_timeout() family of sleeps,
based one what you would like to be woken up on:
Signals and Waitqueue events:
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(some_time_in_jiffies);
Signals only:
msleep_interruptible(some_time_in_msecs);
Waitqueue events only:
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(some_time_in_jiffies);
Neither signals nor waitqueues:
msleep(some_time_in_msecs);
Hopefully that clears some things up.
w.r.t to wait-queue event sleeping, you probably should also be aware
of the wait_event() family of macros.
Thanks,
Nish
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