|
2013-11-22 18:45, John Emmas skrev:
This crashes:-That's what I have now once again tested with 2.24.4 without extra patches. No crash! I've used gdb, and set breakpoints at Gtk::Object::disconnect_cpp_wrapper() and Glib::ObjectBase::destroy_notify_callback_(). Here's the result: (gdb) break Gtk::Object::disconnect_cpp_wrapper Breakpoint 1 at 0x7ffff7a408b0: file object.cc, line 186. (gdb) break Glib::ObjectBase::destroy_notify_callback_ Breakpoint 2 at 0x7ffff7315300: file objectbase.cc, line 206. (gdb) run Breakpoint 1, Gtk::Object::disconnect_cpp_wrapper (this=this entry=0x7fffffffd7f0) at object.cc:186 186 { (gdb) bt #0 Gtk::Object::disconnect_cpp_wrapper (this=this entry=0x7fffffffd7f0) at object.cc:186 #1 0x00007ffff7a409d8 in Gtk::Object::_destroy_c_instance (this=0x7fffffffd7f0) at object.cc:108 #2 0x00007ffff7a40be1 in Gtk::Object::destroy_ (this=<optimized out>) at object.cc:264 #3 0x00007ffff79fb624 in Gtk::Adjustment::~Adjustment (this=0x7fffffffd7f0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at adjustment.cc:224 #4 0x0000000000404ffc in MyDialog::MyDialog (this=0x6ac020, title=..., modal=true, use_separator=true, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at main.cc:15 #5 0x00000000004050fe in main (argc=1, argv=0x7fffffffd9c8) at main.cc:23 (gdb) next 195 if(gobj()) (gdb) 198 g_object_steal_qdata((GObject*)gobj(), Glib::quark_); //It will no longer be possible to get the C++ instance from the C instance. (gdb) 201 g_object_set_qdata((GObject*)gobj(), Glib::quark_cpp_wrapper_deleted_, (gpointer)true); (gdb) 204 gobject_ = 0; (gdb) cont Continuing. Breakpoint 1, Gtk::Object::disconnect_cpp_wrapper (this=this entry=0x7fffffffd830) at object.cc:186 186 { (gdb) bt #0 Gtk::Object::disconnect_cpp_wrapper (this=this entry=0x7fffffffd830) at object.cc:186 #1 0x00007ffff7a409d8 in Gtk::Object::_destroy_c_instance (this=0x7fffffffd830) at object.cc:108 #2 0x00007ffff7a40be1 in Gtk::Object::destroy_ (this=<optimized out>) at object.cc:264 #3 0x00007ffff7a62885 in Gtk::SpinButton::~SpinButton (this=0x7fffffffd830, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at spinbutton.cc:432 #4 0x0000000000405008 in MyDialog::MyDialog (this=0x6ac020, title=..., modal=true, use_separator=true, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at main.cc:16 #5 0x00000000004050fe in main (argc=1, argv=0x7fffffffd9c8) at main.cc:23 (gdb) next 195 if(gobj()) (gdb) 198 g_object_steal_qdata((GObject*)gobj(), Glib::quark_); //It will no longer be possible to get the C++ instance from the C instance. (gdb) 201 g_object_set_qdata((GObject*)gobj(), Glib::quark_cpp_wrapper_deleted_, (gpointer)true); (gdb) 204 gobject_ = 0; (gdb) cont Continuing. Breakpoint 1, Gtk::Object::disconnect_cpp_wrapper (this=this entry=0x6ac020) at object.cc:186 186 { (gdb) bt #0 Gtk::Object::disconnect_cpp_wrapper (this=this entry=0x6ac020) at object.cc:186 #1 0x00007ffff7aa1d45 in Gtk::Window::_destroy_c_instance (this=0x6ac020) at window.cc:124 #2 0x00007ffff7aa1d91 in Gtk::Window::destroy_ (this=<optimized out>) at window.cc:104 #3 0x00007ffff7a1817f in Gtk::Dialog::~Dialog (this=0x6ac020, __vtt_parm=0x405728 <VTT for MyDialog+8>, __in_chrg=<optimized out>) at dialog.cc:226 #4 0x00000000004051e2 in MyDialog::~MyDialog (this=0x6ac020, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at main.cc:6 #5 0x00000000004052b4 in MyDialog::~MyDialog (this=0x6ac020, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at main.cc:6 #6 0x0000000000405138 in main (argc=1, argv=0x7fffffffd9c8) at main.cc:26 (gdb) next 195 if(gobj()) (gdb) 198 g_object_steal_qdata((GObject*)gobj(), Glib::quark_); //It will no longer be possible to get the C++ instance from the C instance. (gdb) 201 g_object_set_qdata((GObject*)gobj(), Glib::quark_cpp_wrapper_deleted_, (gpointer)true); (gdb) 204 gobject_ = 0; (gdb) cont Continuing. [Inferior 1 (process 3001) exited normally] (gdb) When the SpinButton or the Adjustment is deleted, Gtk::Object::disconnect_cpp_wrapper() is called. g_object_steal_qdata((GObject*)gobj(), Glib::quark_) is called from there. Because of that, Glib::ObjectBase::destroy_notify_callback_() is not called. Glib::ObjectBase::destroy_notify_callback_() is the GDestroyNotify function, associated with Glib::quark_ in Glib::ObjectBase::_set_current_wrapper(). When that GQuark has been removed (stolen), the GDestroyNotify function will not be called. I don't know if this helps us. I once again get the suspicion that g_object_steal_qdata() does not work correctly for you. Kjell |