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.
> 
> A scheduled cron job runs no matter what the user is doing.

That was just a plain analogy, I'm sure that there are other ways to
describe the task scheduler activities.

> >> 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.
> 
> Sharing global state doesn't imply a service, there are many other
> ways. That doesn't mean we can't have a service, but it doesn't justify
> having it run in every Wine session.

How the tasks I described already could be performed without a service?

-- 
Dmitry.