schedsvc: Add Task Scheduler service. Try 2.

[Alexandre Julliard]

Dmitry Timoshkov <dmitry at baikal.ru> writes:

> Alexandre Julliard <julliard at winehq.org> wrote:
>
>> >> >> 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?
>> 
>> There are plenty of ways to share global state, I'm sure you can think
>> of a few yourself. Again, I'm not saying we can't have a service at all;
>> but you need to find a way to not add extra cost to every single session
>> for the sake of a few rare cases.
>
> Would starting the service from taskschd.dll when an application calls
> ITaskService::Connect() be a viable compromise? Of course that would mean
> that the scheduled tasks will be added to the queue only when the service
> is running.

If there are scheduled tasks then it's OK for the service to be running
always; but as long as there aren't, it should be started on-demand.

-- 
Alexandre Julliard
julliard at winehq.org