On 23 Jan 2006, at 08:50, Roman Belenov wrote:
I hacked a bit trying to implement logoff with graceful application
termination on GNUstep and got some questions:
1) How to get a list of all running GNUstep applications ?
launchedApplications seems to return only the list of apps launched
from the
current one. For now I just use a list of message ports obtained by
examining
corresponding subdirectory and treat everythying as a proxy for
application.
Well, the way workspace operations generally *should* work as I
understand it, is that they should contact the workspace manager
application and ask it to do the job for them. There is partial
support for this in the NSWorkspace class, but it has never been
completed. Basically, the idea is that the local NSWorkspace
instance should first try to ask the workspace manager application to
do jobs, and if no application is found, it should do the best it
can. In the case of launched tasks, this means that every
application keeps track of any tasks it sees being launched, but
since there is no workspace application launching all tasks, there is
no central repository of all the information.
So, what you should ideally be doing is fixing that ...
Problem is that it was never completed because to make it useful
there needs to be a workspace manager application and when I wrote it
no such application existed. Then later Enrico wrote GWorkspace
without much attention to integration with the NSWorkspace class, and
we never got together to make it all work.
2) What is the correct way to check the result of sending terminate to
application (from another one) ? Experiments show that if
application actually
terminates, I get an exception caused by connection timeout.
Yes .. you expect the connection to go away when the app terminates.
I don't think there is any realistic way you can be absolutely sure
an app has completely gone away (though you could try registering a
port using the name of the task ... if it works then the app has
gone ... if it fails either the app is still running or another app
with the same name has started). It's probably best to just assume
that loss of the connection to the app means that it has died.
Of course, in the case of the workspace manager application (which
should generally have launched the app and be responsible for
shutting it down too), you have an NSTask object corresponding to the
launched application, so you can check the NSTask instance to see if
the application is still running after it has been told to terminate.
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