[coyotos-dev] Sleep, wakeup, and persistence - wall clock

[Charles Landau]

At 4:22 PM -0400 9/22/07, Jonathan S. Shapiro wrote:
>I want to respond to one thing that Charlie wrote.
>
>First, let's consider the case where a system has access to a wall clock
>[or equivalently an external time source]. Charlie has proposed that
>such a system might want two distinct sleep interfaces:
>
>>  Interface 1: sleep untill a given wall clock time
>>
>>  Interface 2: sleep until a given wall clock time or system restart,
>>  whichever occurs sooner
>
>Offhand, I don't think that this [interface 2] serves a purpose.

It was someone else who suggested the need for interface 2:

At 2:30 PM +0200 9/15/07, Valerio Bellizzomi wrote:
>Yes, I agree that [cancelling sleeps on restart] seems to be the 
>only sensible thing to do. If the
>system had a power loss, probably there is some alarm to service ASAP on
>restart, and you don't want you application to be sleeping at that time.

I don't necessarily defend that suggestion. In any case, any need for 
interface 2 can be met by two processes, one waiting for a wall clock 
time and one waiting for a restart.