Messages in this thread Patch in this message | | | From | Denis Vlasenko <> | Subject | Re: [RFC] Driver writer's guide to sleeping | Date | Sat, 25 Jun 2005 14:54:36 +0300 |
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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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