Fix various problems with unloading ClientPrefs and SourceMod (bug 5874, r=ds).

--HG--
extra : rebase_source : 0a35f8380d651ca65fac9dd402c5cd3625e3105c

core/logic/ExtensionSys.cpp

@@ -775,25 +775,21 @@ CExtension *CExtensionManager::FindByOrder(unsigned int num)
 bool CExtensionManager::UnloadExtension(IExtension *_pExt)
 {
 	if (!_pExt)
-	{
 		return false;
-	}
 
 	CExtension *pExt = (CExtension *)_pExt;
 
 	if (m_Libs.find(pExt) == m_Libs.end())
-	{
 		return false;
-	}
 
 	/* Tell it to unload */
 	if (pExt->IsLoaded())
-	{
+		pExt->GetAPI()->OnExtensionUnload();
-		IExtensionInterface *pAPI = pExt->GetAPI();
-		pAPI->OnExtensionUnload();
-	}
 
-	/* First remove us from internal lists */
+	// Remove us from internal lists. Note that because we do this, it's
+	// possible that our extension could be added back if another plugin
+	// tries to load during this process. If we ever find this to happen,
+	// we can just block plugin loading.
 	g_ShareSys.RemoveInterfaces(_pExt);
 	m_Libs.remove(pExt);
 
@@ -827,13 +823,9 @@ bool CExtensionManager::UnloadExtension(IExtension *_pExt)
 		{
 			pDep = (*c_iter);
 			if ((pAPI=pDep->GetAPI()) == NULL)
-			{
 				continue;
-			}
 			if (pDep == pExt)
-			{
 				continue;
-			}
 			/* Now, get its dependency list */
 			bool dropped = false;
 			List<IfaceInfo>::iterator i_iter = pDep->m_Deps.begin();
@@ -862,15 +854,11 @@ bool CExtensionManager::UnloadExtension(IExtension *_pExt)
 			while (i_iter != pDep->m_ChildDeps.end())
 			{
 				if ((*i_iter).owner == pExt)
-				{
 					i_iter = pDep->m_ChildDeps.erase(i_iter);
-				}
 				else
-				{
 					i_iter++;
 			}
 		}
-		}
 
 		/* Unbind our natives from Core */
 		pExt->DropEverything();
@@ -887,6 +875,11 @@ bool CExtensionManager::UnloadExtension(IExtension *_pExt)
 		}
 	}
 
+	// Everything has been informed that we're unloading, so give the
+	// extension one last notification.
+	if (pExt->IsLoaded() && pExt->GetAPI()->GetExtensionVersion() >= 7)
+		pExt->GetAPI()->OnDependenciesDropped();
+
 	pExt->Unload();
 	delete pExt;
 

core/logic/common_logic.cpp

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 sw=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -147,6 +147,7 @@ static void logic_init(const sm_core_t* core, sm_logic_t* _logic)
 	gamehelpers = core->gamehelpers;
 	g_pSourcePawn = *core->spe1;
 	g_pSourcePawn2 = *core->spe2;
+	SMGlobalClass::head = core->listeners;
 
 	g_ShareSys.Initialize();
 	g_pCoreIdent = g_ShareSys.CreateCoreIdentity();

core/logic/intercom.h

@@ -49,7 +49,7 @@ using namespace SourceHook;
  * Add 1 to the RHS of this expression to bump the intercom file
  * This is to prevent mismatching core/logic binaries
  */
-#define SM_LOGIC_MAGIC		(0x0F47C0DE - 22)
+#define SM_LOGIC_MAGIC		(0x0F47C0DE - 23)
 
 #if defined SM_LOGIC
 class IVEngineServer
@@ -270,6 +270,7 @@ struct sm_core_t
 	void *          serverFactory;
 	void *          engineFactory;
 	void *          matchmakingDSFactory;
+	SMGlobalClass *	listeners;
 };
 
 struct sm_logic_t

core/logic_bridge.cpp

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 sw=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod
  * Copyright (C) 2004-2010 AlliedModders LLC.  All rights reserved.
@@ -406,6 +406,7 @@ void InitLogicBridge()
 
 	core_bridge.engineFactory = (void *)g_SMAPI->GetEngineFactory(false);
 	core_bridge.serverFactory = (void *)g_SMAPI->GetServerFactory(false);
+	core_bridge.listeners = SMGlobalClass::head;
 
 	ILibrary *mmlib;
 	char path[PLATFORM_MAX_PATH];

core/sourcemod.cpp

@@ -129,6 +129,8 @@ ConfigResult SourceModBase::OnSourceModConfigChanged(const char *key,
 	return ConfigResult_Ignore;
 }
 
+static bool sSourceModInitialized = false;
+
 bool SourceModBase::InitializeSourceMod(char *error, size_t maxlength, bool late)
 {
 	const char *gamepath = g_SMAPI->GetBaseDir();
@@ -240,6 +242,8 @@ bool SourceModBase::InitializeSourceMod(char *error, size_t maxlength, bool late
 
 	g_pSourcePawn2->SetDebugListener(logicore.debugger);
 
+	sSourceModInitialized = true;
+
 	/* Hook this now so we can detect startup without calling StartSourceMod() */
 	SH_ADD_HOOK(IServerGameDLL, LevelInit, gamedll, SH_MEMBER(this, &SourceModBase::LevelInit), false);
 
@@ -474,24 +478,34 @@ size_t SourceModBase::BuildPath(PathType type, char *buffer, size_t maxlength, c
 }
 
 void SourceModBase::CloseSourceMod()
+{
+	if (!sSourceModInitialized)
+		return;
+
+	SH_REMOVE_HOOK(IServerGameDLL, LevelInit, gamedll, SH_MEMBER(this, &SourceModBase::LevelInit), false);
+
+	if (g_Loaded)
 	{
 		/* Force a level end */
 		LevelShutdown();
+		ShutdownServices();
+	}
 
+	/* Rest In Peace */
+	ShutdownLogicBridge();
+	ShutdownJIT();
+}
+
+void SourceModBase::ShutdownServices()
+{
 	/* Unload plugins */
 	scripts->Shutdown();
 
 	/* Unload extensions */
 	extsys->Shutdown();
 
-	SH_REMOVE_HOOK(IServerGameDLL, LevelInit, gamedll, SH_MEMBER(this, &SourceModBase::LevelInit), false);
-
-	if (g_Loaded)
-	{
 	if (g_pOnMapEnd)
-		{
 		g_Forwards.ReleaseForward(g_pOnMapEnd);
-		}
 
 	/* Notify! */
 	SMGlobalClass *pBase = SMGlobalClass::head;
@@ -535,11 +549,6 @@ void SourceModBase::CloseSourceMod()
 	SH_REMOVE_HOOK(IServerGameDLL, GameFrame, gamedll, SH_MEMBER(&g_Timers, &TimerSystem::GameFrame), false);
 }
 
-	/* Rest In Peace */
-	ShutdownLogicBridge();
-	ShutdownJIT();
-}
-
 void SourceModBase::LogMessage(IExtension *pExt, const char *format, ...)
 {
 	IExtensionInterface *pAPI = pExt->GetAPI();

core/sourcemod.h

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod
  * Copyright (C) 2004-2010 AlliedModders LLC.  All rights reserved.
@@ -136,6 +136,8 @@ public: // ISourceMod
 	int GetPluginId();
 	int GetShApiVersion();
 	bool IsMapRunning();
+private:
+	void ShutdownServices();
 private:
 	CStack<CDataPack *> m_freepacks;
 	char m_SMBaseDir[PLATFORM_MAX_PATH];

extensions/clientprefs/cookie.cpp

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Client Preferences Extension
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -55,35 +55,12 @@ void CookieManager::Unload()
 	for (int i = playerhelpers->GetMaxClients()+1; --i > 0;)
 	{
 		if (connected[i])
-		{
 			OnClientDisconnecting(i);
 	}
-	}
 
 	/* Find all cookies and delete them */
-	Cookie *current;
-
 	for (SourceHook::List<Cookie *>::iterator _iter = cookieList.begin(); _iter != cookieList.end(); _iter++)
-	{
+		delete (*_iter);
-		current = (Cookie *)*_iter;
-
-		if (current == NULL)
-		{
-			continue;
-		}
-
-		g_ClientPrefs.cookieMutex->Lock();
-		if (current->usedInQuery)
-		{
-			current->shouldDelete = true;
-			g_ClientPrefs.cookieMutex->Unlock();
-		}
-		else
-		{
-			g_ClientPrefs.cookieMutex->Unlock();
-			delete current;
-		}
-	}
 	
 	cookieList.clear();
 }
@@ -93,9 +70,7 @@ Cookie *CookieManager::FindCookie(const char *name)
 	Cookie **pCookie = cookieTrie.retrieve(name);
 
 	if (pCookie == NULL)
-	{
 		return NULL;
-	}
 
 	return *pCookie;
 }
@@ -116,7 +91,6 @@ Cookie *CookieManager::CreateCookie(const char *name, const char *description, C
 
 	/* First time cookie - Create from scratch */
 	pCookie = new Cookie(name, description, access);
-	pCookie->usedInQuery++;
 	
 	/* Attempt to insert cookie into the db and get its ID num */
 	TQueryOp *op = new TQueryOp(Query_InsertCookie, pCookie);

extensions/clientprefs/cookie.h

@@ -75,34 +75,23 @@ struct Cookie
 		dbid = -1;
 
 		for (int i=0; i<=MAXCLIENTS; i++)
-		{
 			data[i] = NULL;
 	}
 
-		shouldDelete = false;
-		usedInQuery = 0;
-	}
-
 	~Cookie()
 	{
 		for (int i=0; i<=MAXCLIENTS; i++)
 		{
 			if (data[i] != NULL)
-			{
 				delete data[i];
 		}
 	}
-	}
 
 	char name[MAX_NAME_LENGTH+1];
 	char description[MAX_DESC_LENGTH+1];
 	int dbid;
 	CookieData *data[MAXCLIENTS+1];
 	CookieAccess access;
-
-	/* Reference counting stuff */
-	bool shouldDelete;
-	int usedInQuery;
 };
 
 class CookieManager : public IClientListener, public IPluginsListener

extensions/clientprefs/extension.cpp

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Client Preferences Extension
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -50,9 +50,6 @@ DbDriver g_DriverType;
 
 bool ClientPrefs::SDK_OnLoad(char *error, size_t maxlength, bool late)
 {
-	queryMutex = threader->MakeMutex();
-	cookieMutex = threader->MakeMutex();
-
 	DBInfo = dbi->FindDatabaseConf("clientprefs");
 
 	if (DBInfo == NULL)
@@ -155,13 +152,15 @@ void ClientPrefs::NotifyInterfaceDrop(SMInterface *pInterface)
 	}
 }
 
-void ClientPrefs::SDK_OnUnload()
+void ClientPrefs::SDK_OnDependenciesDropped()
 {
+	// At this point, we're guaranteed that DBI has flushed the worker thread
+	// for us, so no cookies should have outstanding queries.
+	g_CookieManager.Unload();
+
 	handlesys->RemoveType(g_CookieType, myself->GetIdentity());
 	handlesys->RemoveType(g_CookieIterator, myself->GetIdentity());
 
-	g_CookieManager.Unload();
-
 	if (Database != NULL)
 	{
 		Database->Close();
@@ -199,9 +198,6 @@ void ClientPrefs::SDK_OnUnload()
 
 	plsys->RemovePluginsListener(&g_CookieManager);
 	playerhelpers->RemoveClientListener(&g_CookieManager);
-
-	queryMutex->DestroyThis();
-	cookieMutex->DestroyThis();
 }
 
 void ClientPrefs::OnCoreMapStart(edict_t *pEdictList, int edictCount, int clientMax)
@@ -312,7 +308,11 @@ void ClientPrefs::DatabaseConnect()
 
 	databaseLoading = false;
 
+	// Need a new scope because of the goto above.
+	{
+		ke::AutoLock lock(&queryLock);
 		this->ProcessQueryCache();	
+	}
 	return;
 
 fatal_fail:
@@ -323,23 +323,17 @@ fatal_fail:
 
 bool ClientPrefs::AddQueryToQueue(TQueryOp *query)
 {
-	queryMutex->Lock();
+	{
+		ke::AutoLock lock(&queryLock);
 		if (Database == NULL)
 		{
 			cachedQueries.push_back(query);
-		queryMutex->Unlock();
 			return false;
 		}
 		
 		if (!cachedQueries.empty())
-	{
-		queryMutex->Unlock();
 			this->ProcessQueryCache();
 	}
-	else
-	{
-		queryMutex->Unlock();
-	}
 
 	query->SetDatabase(Database);
 	dbi->AddToThreadQueue(query, PrioQueue_Normal);
@@ -348,12 +342,11 @@ bool ClientPrefs::AddQueryToQueue( TQueryOp *query )
 
 void ClientPrefs::ProcessQueryCache()
 {
-	if (Database == NULL)
+	queryLock.AssertCurrentThreadOwns();
-	{
+
-		return;
+	if (Database == NULL)
-	}
+		return;
 
-	queryMutex->Lock();
 	TQueryOp *op;
 	for (SourceHook::List<TQueryOp *>::iterator iter = cachedQueries.begin(); iter != cachedQueries.end(); iter++)
 	{
@@ -363,7 +356,6 @@ void ClientPrefs::ProcessQueryCache()
 	}
 
 	cachedQueries.clear();
-	queryMutex->Unlock();
 }
 
 size_t IsAuthIdConnected(char *authID)
@@ -417,8 +409,7 @@ void ClientPrefs::CatchLateLoadClients()
 
 void ClientPrefs::ClearQueryCache(int serial)
 {
-	queryMutex->Lock();
+	ke::AutoLock lock(&queryLock);
-
 	for (SourceHook::List<TQueryOp *>::iterator iter = cachedQueries.begin(); iter != cachedQueries.end();)
 	{
 		TQueryOp *op = *iter;
@@ -432,7 +423,6 @@ void ClientPrefs::ClearQueryCache(int serial)
 			iter++;
  		}
  	}
-	queryMutex->Unlock();
 }
 
 bool Translate(char *buffer, 
@@ -530,7 +520,5 @@ ClientPrefs::ClientPrefs()
 	phrases = NULL;
 	DBInfo = NULL;
 
-	cookieMutex = NULL;
-	queryMutex = NULL;
 	identity = NULL;
 }

extensions/clientprefs/extension.h

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Client Preferences Extension
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -39,6 +39,8 @@
 #include "smsdk_ext.h"
 #include "sh_list.h"
 
+#include <ke_thread_utils.h>
+
 char * UTIL_strncpy(char * destination, const char * source, size_t num);
 
 #include "cookie.h"
@@ -74,10 +76,7 @@ public:
 	 */
 	virtual bool SDK_OnLoad(char *error, size_t maxlength, bool late);
 
-	/**
+	virtual void SDK_OnDependenciesDropped();
-	 * @brief This is called right before the extension is unloaded.
-	 */
-	virtual void SDK_OnUnload();
 
 	/**
 	 * @brief This is called once all known extensions have been loaded.
@@ -162,7 +161,7 @@ public:
 
 private:
 	SourceHook::List<TQueryOp *> cachedQueries;
-	IMutex *queryMutex;
+	ke::Mutex queryLock;
 	IdentityToken_t *identity;
 };
 

extensions/clientprefs/query.cpp

@@ -303,23 +303,6 @@ int TQueryOp::PullQuerySerial()
 
 ParamData::~ParamData()
 {
-	if (cookie)
-	{
-		g_ClientPrefs.cookieMutex->Lock();
-		cookie->usedInQuery--;
-
-		if (cookie->shouldDelete && cookie->usedInQuery <= 0)
-		{
-			g_ClientPrefs.cookieMutex->Unlock();
-			delete cookie;
-			cookie = NULL;
-		}
-		else
-		{
-			g_ClientPrefs.cookieMutex->Unlock();
-		}
-	}
-
 	if (data)
 	{
 		/* Data is only ever passed in a client disconnect query and always needs to be deleted */

extensions/clientprefs/sdk/smsdk_config.h

@@ -67,7 +67,7 @@
 //#define SMEXT_ENABLE_MEMUTILS
 #define SMEXT_ENABLE_GAMEHELPERS
 //#define SMEXT_ENABLE_TIMERSYS
-#define SMEXT_ENABLE_THREADER
+//#define SMEXT_ENABLE_THREADER
 //#define SMEXT_ENABLE_LIBSYS
 #define SMEXT_ENABLE_MENUS
 //#define SMEXT_ENABLE_ADTFACTORY

extensions/clientprefs/sdk/smsdk_ext.cpp

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Base Extension Code
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -97,6 +97,12 @@ IUserMessages *usermsgs = NULL;
 #if defined SMEXT_ENABLE_TRANSLATOR
 ITranslator *translator = NULL;
 #endif
+#if defined SMEXT_ENABLE_NINVOKE
+INativeInterface *ninvoke = NULL;
+#endif
+#if defined SMEXT_ENABLE_ROOTCONSOLEMENU
+IRootConsole *rootconsole = NULL;
+#endif
 
 /** Exports the main interface */
 PLATFORM_EXTERN_C IExtensionInterface *GetSMExtAPI()
@@ -185,6 +191,12 @@ bool SDKExtension::OnExtensionLoad(IExtension *me, IShareSys *sys, char *error,
 #if defined SMEXT_ENABLE_TRANSLATOR
 	SM_GET_IFACE(TRANSLATOR, translator);
 #endif
+#if defined SMEXT_ENABLE_NINVOKE
+	SM_GET_IFACE(NINVOKE, ninvoke);
+#endif
+#if defined SMEXT_ENABLE_ROOTCONSOLEMENU
+	SM_GET_IFACE(ROOTCONSOLE, rootconsole);
+#endif
 
 	if (SDK_OnLoad(error, maxlength, late))
 	{
@@ -227,6 +239,11 @@ void SDKExtension::OnExtensionUnload()
 	SDK_OnUnload();
 }
 
+void SDKExtension::OnDependenciesDropped()
+{
+	SDK_OnDependenciesDropped();
+}
+
 const char *SDKExtension::GetExtensionAuthor()
 {
 	return SMEXT_CONF_AUTHOR;
@@ -279,6 +296,10 @@ void SDKExtension::SDK_OnAllLoaded()
 {
 }
 
+void SDKExtension::SDK_OnDependenciesDropped()
+{
+}
+
 #if defined SMEXT_CONF_METAMOD
 
 PluginId g_PLID = 0;						/**< Metamod plugin ID */

extensions/clientprefs/sdk/smsdk_ext.h

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Base Extension Code
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -91,6 +91,12 @@
 #if defined SMEXT_ENABLE_TRANSLATOR
 #include <ITranslator.h>
 #endif
+#if defined SMEXT_ENABLE_NINVOKE
+#include <INativeInvoker.h>
+#endif
+#if defined SMEXT_ENABLE_ROOTCONSOLEMENU
+#include <IRootConsoleMenu.h>
+#endif
 
 #if defined SMEXT_CONF_METAMOD
 #include <ISmmPlugin.h>
@@ -121,7 +127,7 @@ public:
 	virtual bool SDK_OnLoad(char *error, size_t maxlength, bool late);
 	
 	/**
-	 * @brief This is called right before the extension is unloaded.
+	 * @brief This is called once the extension unloading process begins.
 	 */
 	virtual void SDK_OnUnload();
 
@@ -135,6 +141,12 @@ public:
 	 */
 	virtual void SDK_OnPauseChange(bool paused);
 
+	/**
+	 * @brief Called after SDK_OnUnload, once all dependencies have been
+	 * removed, and the extension is about to be removed from memory.
+	 */
+	virtual void SDK_OnDependenciesDropped();
+
 #if defined SMEXT_CONF_METAMOD
 	/**
 	 * @brief Called when Metamod is attached, before the extension version is called.
@@ -197,6 +209,9 @@ public: //IExtensionInterface
 	virtual const char *GetExtensionDescription();
 	/** Returns date string */
 	virtual const char *GetExtensionDateString();
+
+	/** Called after OnExtensionUnload, once dependencies have been dropped. */
+	virtual void OnDependenciesDropped();
 #if defined SMEXT_CONF_METAMOD
 public: //ISmmPlugin
 	/** Called when the extension is attached to Metamod. */
@@ -289,6 +304,12 @@ extern IUserMessages *usermsgs;
 #if defined SMEXT_ENABLE_TRANSLATOR
 extern ITranslator *translator;
 #endif
+#if defined SMEXT_ENABLE_NINVOKE
+extern INativeInterface *ninvoke;
+#endif
+#if defined SMEXT_ENABLE_ROOTCONSOLEMENU
+extern IRootConsole *rootconsole;
+#endif
 
 #if defined SMEXT_CONF_METAMOD
 PLUGIN_GLOBALVARS();

public/IExtensionSys.h

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -134,8 +134,9 @@ namespace SourceMod
 	 * itself is not versioned.
 	 *
 	 * V6 - added TestFeature() to IShareSys.
+	 * V7 - added OnDependenciesDropped() to IExtensionInterface.
 	 */
-	#define SMINTERFACE_EXTENSIONAPI_VERSION	6
+	#define SMINTERFACE_EXTENSIONAPI_VERSION	7
 
 	/**
 	 * @brief The interface an extension must expose.
@@ -313,6 +314,17 @@ namespace SourceMod
 		virtual void OnCoreMapStart(edict_t *pEdictList, int edictCount, int clientMax)
 		{
 		}
+
+		/**
+		 * @brief Called once all dependencies have been unloaded. This is
+		 * called AFTER OnExtensionUnload(), but before the extension library
+		 * has been unloaded. It can be used as an alternate unload hook for
+		 * cases where having no dependent plugins would make shutdown much
+		 * simplier.
+		 */
+		virtual void OnDependenciesDropped()
+		{
+		}
 	};
 
 	/**

public/sample_ext/sdk/smsdk_ext.cpp

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Base Extension Code
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -239,6 +239,11 @@ void SDKExtension::OnExtensionUnload()
 	SDK_OnUnload();
 }
 
+void SDKExtension::OnDependenciesDropped()
+{
+	SDK_OnDependenciesDropped();
+}
+
 const char *SDKExtension::GetExtensionAuthor()
 {
 	return SMEXT_CONF_AUTHOR;
@@ -291,6 +296,10 @@ void SDKExtension::SDK_OnAllLoaded()
 {
 }
 
+void SDKExtension::SDK_OnDependenciesDropped()
+{
+}
+
 #if defined SMEXT_CONF_METAMOD
 
 PluginId g_PLID = 0;						/**< Metamod plugin ID */

public/sample_ext/sdk/smsdk_ext.h

@@ -1,5 +1,5 @@
 /**
- * vim: set ts=4 :
+ * vim: set ts=4 sw=4 tw=99 noet:
  * =============================================================================
  * SourceMod Base Extension Code
  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
@@ -127,7 +127,7 @@ public:
 	virtual bool SDK_OnLoad(char *error, size_t maxlength, bool late);
 	
 	/**
-	 * @brief This is called right before the extension is unloaded.
+	 * @brief This is called once the extension unloading process begins.
 	 */
 	virtual void SDK_OnUnload();
 
@@ -141,6 +141,12 @@ public:
 	 */
 	virtual void SDK_OnPauseChange(bool paused);
 
+	/**
+	 * @brief Called after SDK_OnUnload, once all dependencies have been
+	 * removed, and the extension is about to be removed from memory.
+	 */
+	virtual void SDK_OnDependenciesDropped();
+
 #if defined SMEXT_CONF_METAMOD
 	/**
 	 * @brief Called when Metamod is attached, before the extension version is called.
@@ -203,6 +209,9 @@ public: //IExtensionInterface
 	virtual const char *GetExtensionDescription();
 	/** Returns date string */
 	virtual const char *GetExtensionDateString();
+
+	/** Called after OnExtensionUnload, once dependencies have been dropped. */
+	virtual void OnDependenciesDropped();
 #if defined SMEXT_CONF_METAMOD
 public: //ISmmPlugin
 	/** Called when the extension is attached to Metamod. */