Bug 18457 - Memory not free with Dispose
Summary: Memory not free with Dispose
Status: RESOLVED NORESPONSE
Alias: None
Product: Class Libraries
Classification: Mono
Component: Mono.Cairo ()
Version: 3.2.x
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2014-03-19 05:38 UTC by KOEHLER Christophe
Modified: 2018-03-13 11:07 UTC (History)
1 user (show)

Tags:
Is this bug a regression?: ---
Last known good build:


Attachments
Source code for display an ip camera snapshot in a drawing area (20.00 KB, application/x-gzip)
2014-03-19 05:38 UTC, KOEHLER Christophe
Details


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Status:
RESOLVED NORESPONSE

Description KOEHLER Christophe 2014-03-19 05:38:39 UTC
Created attachment 6351 [details]
Source code for display an ip camera snapshot in a drawing area

Hi,

I built a little example for using a webcam (ip camera) and loading snapshot from it and display it in a drawing area.
This application have to run 24h/24 7d/7.
I used the linux command 'top' to show memory usage and I saw that it increase slowly but endless.

I think the problem is in the execution of this part of the code which is called each time a snapshot is take :

	protected void RefreshyDisplay (){
		Application.Invoke (delegate(object sender, EventArgs e) {

			if ( image != null ){
				Cairo.Context gr = Gdk.CairoHelper.Create(daCamera.GdkWindow);
				image.Show(gr,0,0);
				gr.GetTarget().Dispose();
				gr.Dispose();
			};
		});
	}

I joined the source code build with Monodevelop.
Comment 1 Mikayla Hutchinson [MSFT] 2014-03-22 16:40:32 UTC
What version of Mono.Cairo?

There was a wrapper leak that was fixed in https://github.com/mono/mono/commit/7fb3dc1e9f0eb28bc0f3de58968979d22ec2c6ad
Comment 2 KOEHLER Christophe 2014-03-24 09:13:52 UTC
Console.WriteLine ("Cairo version : "+Assembly.GetAssembly( typeof(Cairo.Context) ).GetName());

==> 

Cairo version : Mono.Cairo, Version=2.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756
Comment 3 Mikayla Hutchinson [MSFT] 2014-03-26 14:20:14 UTC
The assembly version is not useful since it's frozen. We need the Mono version/commit that it was build from.
Comment 4 KOEHLER Christophe 2014-03-27 12:56:22 UTC
I use the mono version 3.2.8-138.1  in opensuse 12.3 from the repository http://download.opensuse.org/repositories/Mono:/Factory/openSUSE_12.3
Comment 5 Mikayla Hutchinson [MSFT] 2014-04-02 18:59:26 UTC
I took a look through the Mono.Cairo calls and they look fine. What makes you think the leak is in Mono.Cairo and not Cairo or GTK?

Also, what's the purpose of the "gr.GetTarget().Dispose();"? That's a no-op.

FWIW, you app will not deal with redraw correctly. Better would be to call QueueDraw from your Application.Invoke, and do the drawing from an Expose event handler.
Comment 6 Marek Safar 2018-03-13 11:07:12 UTC
We have not received the requested information. If you are still experiencing this issue please provide all the requested information and reopen the bug report.

Thank you!