SubscriberSlot copy - segfault on cleanup
Posted: Sun Sep 01, 2013 19:56
I am having issues with SubscriberSlot in 0.8.2. The system is giving me a SEGFAULT on cleanup of the subscriber slot. (Which I cant trace back to a point in my code because its happening I believe during the static destruction of CEGUI)
I have a list of objects that need the same events. Each object contains multiple CEGUI::Window's and those windows also have some duplicate events. As these items are being created i am passing a SubscriberSlot to my object ctor and then subscribing the events as I create the windows. Maybe an example will make it clearer.
With just two windows (sibling windows) it was working. As I add more I begin to have problems. If I have a parent and a child window with the same event the problem shows up every time. Here is where in the code the debugger shows me the issue is happening.
I'm guessing that it is trying to delete the functor that has already been deleted. But I have no idea why. I am using the same pattern I was using in 0.7 and had no issues there.
Anyway, the obvious work-around was to not pass SubscriberSlots and instead use something like std::function.
I have a list of objects that need the same events. Each object contains multiple CEGUI::Window's and those windows also have some duplicate events. As these items are being created i am passing a SubscriberSlot to my object ctor and then subscribing the events as I create the windows. Maybe an example will make it clearer.
Code: Select all
Row::Row(SubscriberSlot click_event) {
name = CreateTextWindow();
name->subscribeEvent(Window::EventMouseClick, click_event);
pic = CreateImageWindow();
pic->subscribeEvent(Window::EventMouseClick, click_event);
base = CreateEmptyWindow();
base->subscribeEvent(WIndow::EventMouseClick, click_event);
base->addChild(name);
base->addChild(pic);
}
With just two windows (sibling windows) it was working. As I add more I begin to have problems. If I have a parent and a child window with the same event the problem shows up every time. Here is where in the code the debugger shows me the issue is happening.
Code: Select all
void SubscriberSlot::cleanup()
{
CEGUI_DELETE_AO d_functor_impl; // <== this line here
d_functor_impl = 0;
}I'm guessing that it is trying to delete the functor that has already been deleted. But I have no idea why. I am using the same pattern I was using in 0.7 and had no issues there.
Anyway, the obvious work-around was to not pass SubscriberSlots and instead use something like std::function.
Code: Select all
01/09/2013 15:37:08 (Std) ---- Version: 0.8.2 (Build: Sep 1 2013 Debug GNU/Linux g++ 4.7.2 64 bit) ----
01/09/2013 15:37:08 (Std) ---- Renderer module is: CEGUI::OpenGLRenderer - Official OpenGL based 2nd generation renderer module. TextureTarget support enabled via FBO extension. ----
01/09/2013 15:37:08 (Std) ---- XML Parser module is: CEGUI::RapidXMLParser - Official RapidXML based parser module for CEGUI ----
01/09/2013 15:37:08 (Std) ---- Image Codec module is: SILLYImageCodec - Official SILLY based image codec ----
01/09/2013 15:37:08 (Std) ---- Scripting module is: None ----