It's a hard question. Every time I ask a hard question the list goes quiet.
:( - voogru. -----Original Message----- From: Tony Paloma [mailto:[EMAIL PROTECTED] Sent: Friday, April 27, 2007 5:27 PM To: hlcoders@list.valvesoftware.com Subject: RE: [hlcoders] plugin_unload woes Is there anyone at Valve on this list that knows more about plugin unloading? I'd like to know if there is a reason that the module is not unloaded from memory when plugin_unload unloads a plugin. Thanks, Tony Paloma -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Paloma Sent: Saturday, April 21, 2007 11:17 AM To: hlcoders@list.valvesoftware.com Subject: [hlcoders] plugin_unload woes This is a multipart message in MIME format. -- [ Picked text/plain from multipart/alternative ] This has been brought up before, even as early as 2005, but no discussion really ever took place about it. When a plugin is unloaded with plugin_unload, it's destructor is never called and it is never actually unloaded from memory. This makes it impossible to update plugins without having to restart the server. I've experimented with this, and I believe all that needs to happen is that after the engine calls the plugin's Unload function, it just needs to call filesystem->UnloadModule(plugin). I came up with this based on the fact that if I call it myself in the plugin's Unload function, it successfully calls the destructor and unloads from memory. However, it immediately crashes because it tries to return to the where it left off in the plugin's Unload function which is now invalid memory (see example at end). Furthermore, if you try to get around this by renaming the plugin's DLL after it is "unloaded" and then replacing the DLL with a new one, it just loads the old one. The only way to get around it is to load a completely new DLL (e.g. plugin_2.dll). My plugin fully supports being unloaded and loaded in the middle of a game, but this is the only thing stopping that feature from being useful. Maybe there is a reason it is not unloaded after the plugin_unload command, or maybe it's just a mistake. Could Valve please respond? Example from second paragraph: IFileSystem *filesystem = NULL; CSysModule *g_OurDLL = NULL; bool CEmptyServerPlugin::Load( CreateInterfaceFn interfaceFactory, CreateInterfaceFn gameServerFactory ) { filesystem = (IFileSystem*)interfaceFactory(FILESYSTEM_INTERFACE_VERSION, NULL); g_OurDLL = filesystem->LoadModule( "sourceop" ); // get the handle for our dll to unload later return true; } void CEmptyServerPlugin::Unload( void ) { filesystem->UnloadModule(g_OurDLL); // unload once because we loaded it ourself (decrements engine's use counter) filesystem->UnloadModule(g_OurDLL); // unload again to actually unload dll // crash here (invalid memory access) } -- _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlcoders _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlcoders _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlcoders
