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authorTomaž Vajngerl <tomaz.vajngerl@collabora.co.uk>2016-11-23 17:01:46 +0100
committerTomaž Vajngerl <quikee@gmail.com>2016-11-24 14:26:30 +0000
commitc53cf1dfc5eacd8fee6b2b549ec6b59ad927e01c (patch)
treed606badf14936a325876ea089389517cc637d253
parent93154946452fdedad9b8b536ec3d9704a4707304 (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> (cherry picked from commit bdd108cd72e630189c360c5327c480c1d64d55b1) Reviewed-on: https://gerrit.libreoffice.org/31167 Reviewed-by: Michael Meeks <michael.meeks@collabora.com> Tested-by: Michael Meeks <michael.meeks@collabora.com>
-rw-r--r--dtrans/source/win32/dtobj/XTDataObject.cxx33
-rw-r--r--dtrans/source/win32/dtobj/XTDataObject.hxx3
-rw-r--r--include/vcl/svapp.hxx4
-rw-r--r--toolkit/source/awt/asynccallback.cxx3
4 files changed, 40 insertions, 3 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;
diff --git a/include/vcl/svapp.hxx b/include/vcl/svapp.hxx
index 271922495770..9b930b3127d9 100644
--- a/include/vcl/svapp.hxx
+++ b/include/vcl/svapp.hxx
@@ -776,9 +776,13 @@ public:
User events allow for the deferreal of work to later in the main-loop - at idle.
+ Execution of the deferred work is thread-safe which means all the tasks are executed
+ serially, so no thread-safety locks between tasks are necessary.
+
@param rLink Link to event callback function
@param pCaller Pointer to data sent to the event by the caller. Optional.
@param bReferenceLink If true - hold a VclPtr<> reference on the Link's instance.
+ Taking the reference is guarded by a SolarMutexGuard.
@return the event ID used to post the event.
*/
diff --git a/toolkit/source/awt/asynccallback.cxx b/toolkit/source/awt/asynccallback.cxx
index 95467f944d35..3860207e2584 100644
--- a/toolkit/source/awt/asynccallback.cxx
+++ b/toolkit/source/awt/asynccallback.cxx
@@ -88,8 +88,7 @@ void SAL_CALL AsyncCallback::addCallback(const css::uno::Reference< css::awt::XC
{
if ( Application::IsInMain() )
{
- SolarMutexGuard aSolarGuard;
-
+ // NOTE: We don't need SolarMutexGuard here as Application::PostUserEvent is thread-safe
CallbackData* pCallbackData = new CallbackData( xCallback, aData );
Application::PostUserEvent( LINK( this, AsyncCallback, Notify_Impl ), pCallbackData );
}