schedsvc: Add Task Scheduler service. Try 2.

[Alexandre Julliard]

Dmitry Timoshkov <dmitry at baikal.ru> writes:

> 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.

>> 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.

-- 
Alexandre Julliard
julliard at winehq.org