Le serveur COM hors de processus est bloqué

J’utilise un serveur COM hors processus (COM singleton “Engine” implémenté en utilisant DECLARE_CLASSFACTORY_SINGLETON), il fonctionne dans STA (CComSingleThreadModel, _ATL_APARTMENT_THREADED).

Clients du serveur COM:

1. ActiveScript (JScript), (Je transmets la référence du moteur à l’aide de AddNamedItem).
2. Deux BHOs ​​IE indépendants.

Les BHO appellent périodiquement Engine :: dispatchEvent, Engine appelle les fonctions JavaScript d’ActiveScript. Cette architecture a parfaitement fonctionné jusqu’à ce que je lance simultanément deux BHO.

Si j’active deux BHO, le blocage se produit lorsque j’appelle la fonction d’ActiveScript (en utilisant IDispatch / Invoke). Je ne crée pas de threads supplémentaires.

Quelques notes:

• Si je ne transmets pas l’object récupéré de BHO à ActiveScript (ou le remplace par le même object créé dans Engine), tout fonctionne correctement.
• Coincé ne se produit que lorsque le ramasse-miettes JScript tente de libérer l’object récupéré à partir de BHO (IUnknown_Release_Proxy dans callstack).

Callstack:

> ntdll.dll!_ZwWaitForMultipleObjects@20() + 0x15 bytes ntdll.dll!_ZwWaitForMultipleObjects@20() + 0x15 bytes KernelBase.dll!_WaitForMultipleObjectsEx@20() + 0x100 bytes kernel32.dll!_WaitForMultipleObjectsExImplementation@20() + 0x8e bytes user32.dll!_RealMsgWaitForMultipleObjectsEx@20() + 0xe2 bytes ole32.dll!CCliModalLoop::BlockFn(void * * ahEvent, unsigned long cEvents, unsigned long * lpdwSignaled) Line 1222 C++ ole32.dll!ModalLoop(CMessageCall * pcall) Line 211 C++ ole32.dll!ThreadSendReceive(CMessageCall * pCall) Line 4979 C++ ole32.dll!CRpcChannelBuffer::SwitchAptAndDispatchCall(CMessageCall * * ppCall) Line 4454 + 0x6 bytes C++ ole32.dll!CRpcChannelBuffer::SendReceive2(tagRPCOLEMESSAGE * pMessage, unsigned long * pstatus) Line 4076 C++ ole32.dll!CCliModalLoop::SendReceive(tagRPCOLEMESSAGE * pMsg, unsigned long * pulStatus, IInternalChannelBuffer * pChnl) Line 899 + 0x17 bytes C++ ole32.dll!CAptRpcChnl::SendReceive(tagRPCOLEMESSAGE * pMsg, unsigned long * pulStatus) Line 583 + 0xd bytes C++ ole32.dll!CCtxComChnl::SendReceive(tagRPCOLEMESSAGE * pMessage, unsigned long * pulStatus) Line 734 + 0xa bytes C++ ole32.dll!NdrExtpProxySendReceive(void * pThis, _MIDL_STUB_MESSAGE * pStubMsg) Line 1932 C++ rpcrt4.dll!@NdrpProxySendReceive@4() + 0xe bytes rpcrt4.dll!_NdrClientCall2() + 0x144 bytes ole32.dll!ObjectStublessClient(void * ParamAddress, long Method) Line 474 + 0x8 bytes C++ ole32.dll!_ObjectStubless@0() Line 154 Asm ole32.dll!RemoteReleaseRifRefHelper(IRemUnknown * pRemUnk, int fReleaseRemUnkProxy, int fProcessingPostedMessage, OXIDEntry * pOXIDEntry, unsigned short cRifRef, tagREMINTERFACEREF * pRifRef, IUnknown * pAsyncRelease) Line 6770 + 0xc bytes C++ ole32.dll!RemoteReleaseRifRef(CStdMarshal * pMarshal, OXIDEntry * pOXIDEntry, unsigned short cRifRef, tagREMINTERFACEREF * pRifRef) Line 6694 C++ ole32.dll!CStdMarshal::DisconnectCliIPIDs() Line 3964 C++ ole32.dll!CStdMarshal::Disconnect(unsigned long dwType) Line 3273 C++ ole32.dll!CStdIdentity::~CStdIdentity() Line 312 C++ ole32.dll!CStdIdentity::`scalar deleting destructor'() + 0xd bytes C++ ole32.dll!CStdIdentity::CInternalUnk::Release() Line 767 C++ ole32.dll!IUnknown_Release_Proxy(IUnknown * This) Line 1773 C++ oleaut32.dll!_VariantClear@4() + 0xac9 bytes jscript.dll!VAR::Clear() + 0x50 bytes jscript.dll!GcAlloc::ReclaimGarbage() + 0xa2 bytes jscript.dll!GcContext::Reclaim() + 0x8e bytes jscript.dll!GcContext::CollectCore() - 0x72f bytes jscript.dll!GcContext::Collect() + 0x34 bytes jscript.dll!CScriptRuntime::Run() - 0x864f bytes jscript.dll!ScrFncObj::CallWithFrameOnStack() + 0xf3 bytes jscript.dll!ScrFncObj::Call() + 0x84 bytes jscript.dll!NameTbl::InvokeInternal() + 0x113 bytes jscript.dll!VAR::InvokeByDispID() + 0x73 bytes jscript.dll!CScriptRuntime::Run() + 0x1d89 bytes jscript.dll!ScrFncObj::CallWithFrameOnStack() + 0xf3 bytes jscript.dll!ScrFncObj::Call() + 0x84 bytes jscript.dll!NameTbl::InvokeInternal() + 0x113 bytes jscript.dll!VAR::InvokeByDispID() + 0x73 bytes jscript.dll!CScriptRuntime::Run() + 0x1d89 bytes jscript.dll!ScrFncObj::CallWithFrameOnStack() + 0xf3 bytes jscript.dll!ScrFncObj::Call() + 0x84 bytes jscript.dll!NameTbl::InvokeInternal() + 0x12c6 bytes jscript.dll!VAR::InvokeByDispID() + 0x73 bytes jscript.dll!NameTbl::GetVal() + 0x3b bytes 

Détails d’implémentation:

 // Engine (out of process COM singleton) class ATL_NO_VTABLE CEngine : public CComObjectRootEx, public CComCoClass, public IDispatchImpl { DECLARE_CLASSFACTORY_SINGLETON(CEngine) STDMETHOD(dispatchEvent)(BSTR name, IDispatch* pEvent, VARIANT_BOOL* pbSuccess) { // pEvent is CPropertyStore instance ActiveScriptDispatch.Invoke1(L"FuncName", pEvent, &varResult); } } // BHO class CPropertyStore : public CComObjectRootEx, public CComCoClass, public IDispatch { BEGIN_COM_MAP(CPropertyStore) COM_INTERFACE_ENTRY(IUnknown) COM_INTERFACE_ENTRY(IDispatch) END_COM_MAP() BOOL SetProperty(CSsortingng strName, VARIANT *value) { // Store value in CAtlArray } // IDispatch impl STDMETHOD(GetTypeInfoCount)(UINT *pctinfo); STDMETHOD(GetTypeInfo)(UINT iTInfo, LCID lcid, ITypeInfo **ppTInfo); STDMETHOD(GetIDsOfNames)(REFIID riid, LPOLESTR *rgszNames, UINT cNames, LCID lcid, DISPID *rgDispId); STDMETHOD(Invoke)(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult,EXCEPINFO *pExcepInfo, UINT *puArgErr); } class ATL_NO_VTABLE CBHO : public CComObjectRootEx, public CComCoClass, public IObjectWithSiteImpl, public IDispatchImpl, public IDispEventImpl { void onEvent(...) { if(m_pEngine == NULL && SUCCEEDED(m_pEngine.CoCreateInstance(CLSID_Engine))) { CComObject *pEvent = NULL; HRESULT hRes = CComObject::CreateInstance(&pEvent); CComVariant varEvent(pEvent); CComVariant varName(L"EventName"); CComVariant varResult; m_pEngine.Invoke2(L"dispatchEvent", &varName, &varEvent, &varResult); } } }