[Lazarus] Application slow shutting down

[Susie Nicol]

On Wed, Sep 30, 2015 at 7:50 PM, Michael Van Canneyt <michael at freepascal.org
> wrote:

>
>
> On Wed, 30 Sep 2015, Susie Nicol wrote:
>
> Hi
>>
>> I have an application with a main form, and several others whuich are only
>> ever used in modal form.
>>
>> The application is slow to terminate, and I cannot see why.
>> XFCE on Linux complains that the window containing the main form cannot be
>> closed because 'the application may be busy'.
>>
>>
> 1. Are you using threads ?
>

Hi Michael.

I'm not using threads.


> 2. Do you create a lot of components dynamically that are freed in the
> destructor of the form ?
>
> Both can cause significant delays.
>

Very few overall, and I thought they were safely freed. But heaprtc shows
66 unfreed memory blocks, so that is something I shall check tomorrow (it's
late in NZ)



>> I am using Lazarus 1.4.2, 64-bit, Linux XFCE desktop, GTK+2 widget set.
>>
>> Any suggestions about where to look next will be very welcome.
>>
>
> What I usually do in such case is not use the debugger, but check using
> the strace command-line utility if there is still some activity in the
> application:
>
> Put a writeln('something') before and after the Application.Terminate, and
> check what happens between the write() commands in strace's output.
>

Thanks for that ingenious suggestion. A quick check shows nothing happens
between the two write()s, so Application.Terminate is returning
immediately.  There follows 96 thousand lines of output before the program
gets SIGKILL, so I guess that it was pretty busy!

Something for me to get my teeth into at least.

Thanks
Susie
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