The threading anecdotes - Episode 7

The threading anecdotes - Episode 7

When do_request() destroys the receiver object, the receiver will
free the invalidation record. So the IR needs to be removed from the list
before executing the request.

Invalid read of size 8
   at: AbstractUI<Gtkmm2ext::UIRequest>::handle_ui_requests() (abstract_ui.cc:242)
   by: BaseUI::request_handler(Glib::IOCondition) (base_ui.cc:141)
   by: sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition>::operator()(Glib::IOCondition const&) const (mem_fun.h:2066)
   by: sigc::adaptor_functor<sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition> >::deduce_result_type<Glib::IOCondition const&, void, void, void, void, void, void>::type sigc::adaptor_functor<sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition> >::operator()<Glib::IOCondition const&>(Glib::IOCondition const&) const (adaptor_trait.h:89)
   by: sigc::internal::slot_call1<sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition>, bool, Glib::IOCondition>::call_it(sigc::internal::slot_rep*, Glib::IOCondition const&) (slot.h:148)
   by: sigc::slot1<bool, Glib::IOCondition>::operator()(Glib::IOCondition const&) const (slot.h:643)
   by: cross_thread_channel_call_receive_slot(_GIOChannel*, GIOCondition, void*) (crossthread.cc:49)
   by: g_main_context_dispatch (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.5000.2)
   by: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.5000.2)
   by: g_main_loop_run (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.5000.2)
   by: gtk_main (in /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0.2400.31)
   by: Gtkmm2ext::UI::run(Receiver&) (gtk_ui.cc:286)
   by main (main.cc:408)
 Addrd1b8 is 24 bytes inside a block of size 48 free'd
   at: operator delete(void*) (vg_replace_malloc.c:576)
   by: PBD::EventLoop::invalidate_request(void*) (event_loop.cc:98)
   by: sigc::internal::trackable_callback_list::~trackable_callback_list() (in /usr/lib/x86_64-linux-gnu/libsigc-2.0.so.0.0.0)
   by: sigc::trackable::notify_callbacks() (in /usr/lib/x86_64-linux-gnu/libsigc-2.0.so.0.0.0)
   by: ProcessorEntry::LuaPluginDisplay::~LuaPluginDisplay() (processor_box.cc:1757)
   by: ProcessorEntry::LuaPluginDisplay::~LuaPluginDisplay() (processor_box.cc:1760)
   by: ProcessorEntry::~ProcessorEntry() (processor_box.cc:251)