schedsvc: Add Task Scheduler service. Try 2.

[Dmitry Timoshkov]

Alexandre Julliard <julliard at winehq.org> wrote:

> > Well, I've been thinking of it, and a Wine session lifetime could be
> > considered as a short-living Windows machine, with all the limitations.
> > And there are a lot of various things that the task scheduler is able
> > to do that I don't know how could be mapped say into cron for instance,
> > like executing a COM handler, or supporting many kinds of triggers.
> >
> > There are many known use cases for the task scheduler like a task
> > regularly checking for updates, or a task executed on user logon,
> > or a task being executed on a network connection. For a list of
> > various tasks you could check system32\tasks on any Vista+ system,
> > there are pretty interesting examples in there.
> 
> I still think this needs more thought. Having triggers that only happen
> while some other random Windows app is running doesn't strike me as
> particularly useful.

Well, that's how it's supposed to work actually, just like a scheduled
cron job for instance.

> I also don't think that this limited usefulness justifies the cost of
> running the service in every single Wine session. It should be started
> only when there are actually tasks to schedule.

The service also has a role of global xml task definitions storage, so
that any client application could add or query task status, or check
and change the task running state, and that's impossible to do without
a service, similar to the functionality provided by services.exe.

-- 
Dmitry.