Run / quit user interface and memory clean up

Hi,
may be I simply miss a coffee, but here is my problem: I have a main function and a quit callback in a standard configuration, i.e. as follows:
int main ( int argc, char *argv [] )
    RunUserInterface ();
    DiscardMenuBar ( popup_menubar_handle );
    DiscardMenuBar ( menubar_handle );
    DiscardPanel ( panel_handle );
    return ( 0 );
int CVICALLBACK Quit ( int panel, int control, int event, void *callbackData, int eventData1, int eventData2 )
    if ( event == EVENT_COMMIT )
        FreeDynamicMemory...
        FileCloseFiles ...
        QuitUserInterface ( 0 );
    return ( 0 );
On the panel, there is a graph with plots etc. If I quit the program via the quit callback (i.e. a Quit button), everything is fine, no memory leak.
If I try a modified version as shown below, plots are not freed after the program has finished, resulting in a memory leak as shown by the resource monitor:
int main ( int argc, char *argv [] )
    RunUserInterface ();
    return ( 0 );
int CVICALLBACK Quit ( int panel, int control, int event, void *callbackData, int eventData1, int eventData2 )
    if ( event == EVENT_COMMIT )
        FreeDynamicMemory...
        FileCloseFiles ...
        DiscardMenuBar ( popup_menubar_handle );
        DiscardMenuBar ( menubar_handle );
        DiscardPanel ( panel_handle );
        QuitUserInterface ( 0 );
    return ( 0 );
I have also tried reversing the order in the quit callback, with the same result:
int CVICALLBACK Quit ( int panel, int control, int event, void *callbackData, int eventData1, int eventData2 )
    if ( event == EVENT_COMMIT )
        FreeDynamicMemory...
        FileCloseFiles ...
        QuitUserInterface ( 0 );
        DiscardMenuBar ( popup_menubar_handle );
        DiscardMenuBar ( menubar_handle );
        DiscardPanel ( panel_handle );
    return ( 0 );
So only the first variant works properly and I could be happy.
However, I do not understand why version 2/3 do not work.
Second, the first variant does not work if I also have installed a main callback, see the other thread here That's why I tried variants 2 and 3 but failed...
Thanks for the coffee

Off the top of my head, I can't think of any reason why the 2/3
alternatives wouldn't work. This might be a bug in the resource tracking
detection.
I tried to reproduce the problem with a simple program, but I wasn't
able to. I'm attaching my files. Can you try them out and see if you can
reproduce the problem with them? If not, can you try attaching some
project that reproduces it, so that I can look into it?
Thanks,
Luis
Attachments:
plotleak.zip ‏5 KB

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(hope this is in the right section, here goes)
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TJW
"Lee Robertson" <[email protected]> wrote in message
news:[email protected]...
>I am just learning to use event structures to improve operation of front
>panels.  At the moment, I am working on a tab strucrture we use to
>montinor/set program paramters.  VArious parametera are displayed on
>each tab as controls (not indicators) and are constanly updated sice they
>can be modified elsewhere by other pieces of code.  We controls are
>normally disabled via a property node so they behave more like indicators
>and the values are updated by writing to a local variable (I know this is
>evil but it works in this case).  There is a boolean on each tab that
>toggles between "monitoring" and "changing" modes (or states).  When
>toggles to "changing" (or setting) parameters the monitoring activities are
>suspended and the control are enabbled.  After making the desired
>changes the controls are either read and the changes implimented or get
>rest based on some other boolean controls, the parameters controls are then
>disables and monitoring resumes.  The issue is that many users fing
>the need to toggle between "monitorsing" and "changing" modes to be
>confusing.  I want to replace this switch with an event.  If the
>user clicks on any of the parameters controls in a tab, I want to go into
>changing mode rather than using the "monitoring"/"changing" boolean
>control.  All other asspects are handled as before.  My problem
>is than if I use a mousedown event to go into "changing" mode and the user
>clicks on several parameters to shift the keyboard focus to edit more than
>one parameter, these subsequent mose clciks get processed as new events
>when change mode is exited.  This means that as soon as it returns to
>"monitoring" mode it jumps immeadiately back to "changing" mode.  How
>should I structure the events to avoid this problem?
>  
> Thanks,
>  
> --Lee

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User interface threads

Ok let's say you're writing a user interface and nothing involves
special-resources like a daqcard so there's no constraints on using things
at once. These are some kind of stupid questions and ideas but I'm really
not sure how to write a quality app with user interface at the moment.
My current design is bad, it is a mainVI which checks the menu and
frontpanel buttons, decides which operation or calculation (if any) is
selected, and sends that to a case structure to perform the operation.
This is sloooow but the most common way in examples that I've seen. The
major problem is that while processing the interface isn't checked and
therefore mouseclicks might be lost. Let's say the processing takes like
500ms on average, that is kind of slow between user-interface querys so it
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So here's my three ideas so far, I'd love some comments on what will be FAST
and what would be worthwhile to spend my time on:
1. Leave the app as-is, latch the booleans. However you can't latch
mouse-clicks on a picture indicator that I knew of. I emailed NI before
about this and they just suggested adjusting execution priorities. Anybody
else messed around with this? Probably the worst option, but would take zero
programming.
2. Divorce the user interface and the processing. Create two parallel
while-loops in the same VI, one checks the buttons/menu on the front panel
the other processes the request or calculation. Let's say on average UI
checking takes 1.2ms and processing takes about 500ms. Also in this case is
the watch icon still really my best option (since checking buttons/menu only
takes like 1.5ms on average) for not wasting time repeatedly checking when
there's no input and dividing up cputime accordingly? Seems like there'd be
some overhead in switching back and forth repeatedly.
3. Going all-out and changing to somewhat of an object structure. That way
the UI could create a new "execution" refnum, maintain some list of created
objects, process, return values, destroy any object, so everything could be
going on in parallel. That way one slow calculation won't bog down the rest
of the things the UI requests. The idea is far too abstract to me at this
point, but on a single CPU w98 system is it even worth my thinking about
such a structure? I get the feeling I'd see zero performance change between
the two, in fact maybe worse from any labview thread overhead!
Thanks for any comments. I have seen DAQ intensive apps discussed often, but
don't usually catch much on large user interface apps.
-joey

Hi Joey
First check are you are not recalculating the values on ever iteration of the user interface loop but are you only recalculating
on any change in the user interface values.
Otherwise I would use idea No. 2 but with these changes.
1. Only check the whole user interface every 200-300ms, 1.5ms loop time will unnecessarily load the CPU.
2. Each user interaction could be given a string representation and then placed in a queue to wait for the calculation loop to
have time to process it.(So the user instructions are not lost)
3. Have separate loops for faster and slower calculations (or more) with each having their own queue.
4. The extension to the idea's of having separate loops, is to have each loop in a separate independently running VI (see
VIserver). Still use the queue's to pass the data. This method would allow the calculations and the user interface to run on
separate threads and also lets you alter the execution priority for each VI to fine tune the execution times.
Following these instructions you would produce a basic client-server architecture for your user interface, as long as the UI
doesn't require too many slow calculation results before continuing then this should work well.
If this is still not fast enough then, if you have used suggestion No.4, the calculations can be moved off the users computer to a
faster server (using VIserver) also assuming they are networked.
Hope this gives you some ideas.
Tim S
Joseph Oravec wrote:
> Ok let's say you're writing a user interface and nothing involves
> special-resources like a daqcard so there's no constraints on using things
> at once. These are some kind of stupid questions and ideas but I'm really
> not sure how to write a quality app with user interface at the moment.
>
> My current design is bad, it is a mainVI which checks the menu and
> frontpanel buttons, decides which operation or calculation (if any) is
> selected, and sends that to a case structure to perform the operation.
>
> This is sloooow but the most common way in examples that I've seen. The
> major problem is that while processing the interface isn't checked and
> therefore mouseclicks might be lost. Let's say the processing takes like
> 500ms on average, that is kind of slow between user-interface querys so it
> would feel unresponsive in the mean time.
>
> So here's my three ideas so far, I'd love some comments on what will be FAST
> and what would be worthwhile to spend my time on:
>
> 1. Leave the app as-is, latch the booleans. However you can't latch
> mouse-clicks on a picture indicator that I knew of. I emailed NI before
> about this and they just suggested adjusting execution priorities. Anybody
> else messed around with this? Probably the worst option, but would take zero
> programming.
>
> 2. Divorce the user interface and the processing. Create two parallel
> while-loops in the same VI, one checks the buttons/menu on the front panel
> the other processes the request or calculation. Let's say on average UI
> checking takes 1.2ms and processing takes about 500ms. Also in this case is
> the watch icon still really my best option (since checking buttons/menu only
> takes like 1.5ms on average) for not wasting time repeatedly checking when
> there's no input and dividing up cputime accordingly? Seems like there'd be
> some overhead in switching back and forth repeatedly.
>
> 3. Going all-out and changing to somewhat of an object structure. That way
> the UI could create a new "execution" refnum, maintain some list of created
> objects, process, return values, destroy any object, so everything could be
> going on in parallel. That way one slow calculation won't bog down the rest
> of the things the UI requests. The idea is far too abstract to me at this
> point, but on a single CPU w98 system is it even worth my thinking about
> such a structure? I get the feeling I'd see zero performance change between
> the two, in fact maybe worse from any labview thread overhead!
>
> Thanks for any comments. I have seen DAQ intensive apps discussed often, but
> don't usually catch much on large user interface apps.
>
> -joey

Multiple monitors, duplicate user interfaces

Hey everybody,
My application consists (as the title suggests) of a computer running 4 touchscreen monitors. Three of the monitors will be completely different, but the 4th will need to be a combination of the other 3. The 4th is bigger, so it will actually fit all of the front panel from monitor 1.
Here is a depiction of what the setup will be.
The hard part is that I need Monitor 4 to act exactly like the other monitors in its respective sections. It would be nice to be able to do this without duplicating code or having to send my data to multiple places every time. Do any of you have experience in UI duplication, or know of a clever way to do this?
What I'm thinking I'll have to do is create a new interface for the 4th monitor that triggers the other user interfaces and vice versa. The downside is that it takes extra development on top of the UIs I already have and if I change something with the first 3 UI, I have to go in and change the 4th manually. I would also have to do some fancy global event triggering LIKE THIS in order to communicate between two different VIs.
Any help is highly appreciated.
Thank you!
James
LabVIEW Professional 2014
Solved!
Go to Solution.

GerdW,
My architecture follows a Queued Message Handler structure and allows communication between each module.
Can you elaborate on "duplicate FP"? Is there a way to duplicate just the FP for control purposes, but have the code only running once in the background.
johnsold,
Each GUI is it's own top level Queued Message Handler that sends its information to seperate QMHs through shared API. Essentially this means that each module has its own Master portion that can send its data to another module's Slave and vice versa. This architecture would allow for near-simultaneous user inputs from different locations because the first one to be written to the queue would just get handled first, then overwritten by the other, which isn't a problem.
Can you link to an example of pulling a VI in to a subpanel while simultaneously running another instance of the VI? Every time I try this, I get an error.
Edit: Thanks David
Thanks,
James
LabVIEW Professional 2014

How can I give the "user interface thread" higher priority?

We do alot of activex calls to front panels. We need to increase/decrease the priority of the user interface thread to resolve our thread problem. Anyone know how to do this?
Chuck

Hello,
As P.M. was saying, you can adjust the thread priorities
through the VI Properties dialogue.
Another place to modify the multithreading system in LabVIEW is a VI
located at: [LabVIEW Directory]\vi.lib\Utility\sysinfo.llb\threadconfig.vi. However I do not think this will remedy any
problems you are having.
From a Multithreading in LabVIEW tutorial (http://zone.ni.com/devzone/conceptd.nsf/webmain/d2e196c7416f373a862568690074c759)
Priorities in the User Interface and
Single-Threaded Applications
Within the User Interface execution
system, priority levels are handled in the same way for single-threaded and
multithreaded applications.
In single-threaded applications and
in the User Interface execution system of multithreaded applications, the
execution system queue has multiple entry points. The execution system places
higher priority VIs on the queue in front of lower priority VIs.
If a high-priority task is running and the queue contains only lower priority
tasks, the high-priority VI continues to run. For example, if the execution
queue contains two VIs of each priority level, the time-critical VIs share execution time exclusively until both finish.
Then, the high priority VIs share execution
time exclusively until both finish, and so on. However, if the higher priority
VIs call a function that waits, the execution system removes higher priority
VIs from the queue until the wait or I/O completes, assigning other tasks
(possibly with lower priority) to run. When the wait or I/O completes, the
execution system reinserts the pending task on the queue in front of lower
priority tasks. Refer to the Synchronous/Blocking Nodes section for a list of
asynchronous functions that wait.
Also, if a high priority VI calls a lower priority subVI,
that subVI is raised to the same priority level as the caller for the duration
of that call. Consequently, you do not need to modify the priority levels of
the subVIs that a VI calls to raise the priority level of the subVI.
Thus changing the priority of your VI will change the
priority of UI calls for that particular VI.
Again, I caution you because I suspect that if you are having problems
with your application not running correctly, I do not believe that manipulating
the thread priorities will resolve these issues.
Hope this helps,
Travis M
LabVIEW R&D
National Instruments

Run / quit user interface and memory clean up

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