killing a process on a server

[Allen Matlick]

Hi,

I need to launch a process on the 4D server from a client.  So far, no  
problem.

However, at some point I'd like to be able to kill that process on the  
server from a client.  4D has commands to delay, pause and resume  
processes, but nothing I can see to kill a process.

At this point I'm thinking that I may have to make the server process  
sensitive to a semaphore and then tell it to die via the semaphore.

Has anyone else tackled this problem?  Have I overlooked something?  
I'm open to suggestions.

Thanks in advance.

Allen

-------------------------
Allen Matlick
allen@...
805-893-5219




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[Josh Fletcher (4D, Inc.)]

Hi Allen,

"Killing" a process is generally not a good idea unless the process is
out of control.  The process should end gracefully (which basically
means the method finishes executing).

There are many ways to handle interprocess communication:

-Variables
-Semaphores
-Records in a table

Which one you choose is ultimately up to you but the point I want to
make is the process should wait until something tells it to end, not be
"killed".

Also keep in mind this applies to quitting the database: the processes
should be told do shut down even when quitting.  4D will eventually kill
them, of course, but that's not a graceful way to end.

I hope this makes sense.

Kind regards,

Josh Fletcher

Allen Matlick wrote:

> Hi,
>
> I need to launch a process on the 4D server from a client.  So far, no  
> problem.
>
> However, at some point I'd like to be able to kill that process on the  
> server from a client.  4D has commands to delay, pause and resume  
> processes, but nothing I can see to kill a process.
>
> At this point I'm thinking that I may have to make the server process  
> sensitive to a semaphore and then tell it to die via the semaphore.
>
> Has anyone else tackled this problem?  Have I overlooked something?  
> I'm open to suggestions.
>
> Thanks in advance.
>
> Allen

--
Josh Fletcher
Technical Services Team Member
4D, Inc.

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[Mike-247]

You haven't overlooked anything; there is no "kill process" command.  

I like to steer clear of a semaphore when ever possible, so I use a
inter-process variable.  Create a process to loop and wait, perform some
action and check the variable. When you want the process to die, run another
process on the server that sets the inter-process variable to false.

Make sure you call your routine to kill the process at shutdown too.

Thanks,

Mike

 
Mike Placko
NowData Corporation
2970 Judicial Rd. Suite 210
Burnsville, MN 55337
952-808-0504 ext. 208
mike@...
http://www.nowdata.com

-----Original Message-----
From: 4DBasics@... [mailto:4DBasics@...] On Behalf Of Allen
Matlick
Sent: Wednesday, July 09, 2008 4:14 PM
To: 4D Basics List
Subject: killing a process on a server

Hi,

I need to launch a process on the 4D server from a client.  So far, no  
problem.

However, at some point I'd like to be able to kill that process on the  
server from a client.  4D has commands to delay, pause and resume  
processes, but nothing I can see to kill a process.

At this point I'm thinking that I may have to make the server process  
sensitive to a semaphore and then tell it to die via the semaphore.

Has anyone else tackled this problem?  Have I overlooked something?  
I'm open to suggestions.

Thanks in advance.

Allen

-------------------------
Allen Matlick
allen@...
805-893-5219




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