diff options
author | Tomaž Vajngerl <tomaz.vajngerl@collabora.co.uk> | 2016-11-23 17:01:46 +0100 |
---|---|---|
committer | Tomaž Vajngerl <quikee@gmail.com> | 2016-11-24 12:35:29 +0000 |
commit | bdd108cd72e630189c360c5327c480c1d64d55b1 (patch) | |
tree | 684f28bab926bcaf8dd748a8708d88323f13e031 /dtrans | |
parent | e190825b739712ba0c861d74fc1a589c7e94672d (diff) |
tdf#103852 avoid clipboard deadlock
Deallocate the XTransferable object async using AsyncCallback
(that uses Application::PostUserEvent) which executes the
callback in a thread-safe way on the main thread. This avoids
a deadlock at deallocation so that the XTransferable.
Modify AsyncCallback to not hold the SolarMutexGuard because
Application::PostUserEvent is considered thread-safe.
Document Application::PostUserEvent thread-safety
Change-Id: I4237a1cf380e8be66b3eefc393a58bb4853bf4e1
Reviewed-on: https://gerrit.libreoffice.org/31126
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Diffstat (limited to 'dtrans')
-rw-r--r-- | dtrans/source/win32/dtobj/XTDataObject.cxx | 33 | ||||
-rw-r--r-- | dtrans/source/win32/dtobj/XTDataObject.hxx | 3 |
2 files changed, 35 insertions, 1 deletions
diff --git a/dtrans/source/win32/dtobj/XTDataObject.cxx b/dtrans/source/win32/dtobj/XTDataObject.cxx index 3ca9325a2d3c..1c13d346aa5a 100644 --- a/dtrans/source/win32/dtobj/XTDataObject.cxx +++ b/dtrans/source/win32/dtobj/XTDataObject.cxx @@ -25,8 +25,11 @@ #include "DTransHelper.hxx" #include "TxtCnvtHlp.hxx" #include <com/sun/star/datatransfer/clipboard/XClipboardEx.hpp> +#include "com/sun/star/awt/AsyncCallback.hpp" +#include "com/sun/star/awt/XCallback.hpp" #include "FmtFilter.hxx" #include <comphelper/processfactory.hxx> +#include <cppuhelper/implbase.hxx> #if defined _MSC_VER #pragma warning(push,1) @@ -82,6 +85,28 @@ void SAL_CALL setupStgMedium( const FORMATETC& fetc, OSL_ASSERT( false ); } +/** + We need to destroy XTransferable in the main thread to avoid dead lock + when locking in the clipboard thread. So we transfer the ownership of the + XTransferable reference to this object and release it when the callback + is executed in main thread. +*/ +class AsyncDereference : public cppu::WeakImplHelper<css::awt::XCallback> +{ + Reference<XTransferable> maTransferable; + +public: + AsyncDereference(css::uno::Reference<css::datatransfer::XTransferable> const & rTransferable) + : maTransferable(rTransferable) + {} + + virtual void SAL_CALL notify(css::uno::Any const &) + throw (css::uno::RuntimeException, std::exception) override + { + maTransferable.set(nullptr); + } +}; + // a helper class that will be thrown by the function validateFormatEtc class CInvalidFormatEtcException @@ -174,12 +199,20 @@ CXTDataObject::CXTDataObject( const Reference< XComponentContext >& rxContext, const Reference< XTransferable >& aXTransferable ) : m_nRefCnt( 0 ) , m_XTransferable( aXTransferable ) + , m_XComponentContext( rxContext ) , m_bFormatEtcContainerInitialized( false ) , m_DataFormatTranslator( rxContext ) , m_FormatRegistrar( rxContext, m_DataFormatTranslator ) { } +CXTDataObject::~CXTDataObject() +{ + css::awt::AsyncCallback::create(m_XComponentContext)->addCallback( + new AsyncDereference(m_XTransferable), + css::uno::Any()); +} + // IUnknown->QueryInterface STDMETHODIMP CXTDataObject::QueryInterface( REFIID iid, LPVOID* ppvObject ) diff --git a/dtrans/source/win32/dtobj/XTDataObject.hxx b/dtrans/source/win32/dtobj/XTDataObject.hxx index 8bf3c10ed8c4..db3496dbab24 100644 --- a/dtrans/source/win32/dtobj/XTDataObject.hxx +++ b/dtrans/source/win32/dtobj/XTDataObject.hxx @@ -64,7 +64,7 @@ class CXTDataObject : public IDataObject public: CXTDataObject( const css::uno::Reference< css::uno::XComponentContext >& rxContext, const css::uno::Reference< css::datatransfer::XTransferable >& aXTransferable ); - virtual ~CXTDataObject() {} + virtual ~CXTDataObject(); // ole interface implementation @@ -103,6 +103,7 @@ private: private: LONG m_nRefCnt; css::uno::Reference< css::datatransfer::XTransferable > m_XTransferable; + css::uno::Reference< css::uno::XComponentContext> m_XComponentContext; CFormatEtcContainer m_FormatEtcContainer; bool m_bFormatEtcContainerInitialized; CDataFormatTranslator m_DataFormatTranslator; |