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diff --git a/vcl/source/app/salusereventlist.cxx b/vcl/source/app/salusereventlist.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <salusereventlist.hxx>
+#include <salwtype.hxx>
+
+#include <algorithm>
+#include <cstdlib>
+#include <exception>
+#include <typeinfo>
+
+#include <com/sun/star/uno/Exception.hpp>
+#include <tools/debug.hxx>
+#include <tools/diagnose_ex.h>
+#include <sal/log.hxx>
+#include <sal/types.h>
+#include <svdata.hxx>
+
+SalUserEventList::SalUserEventList()
+ : m_bAllUserEventProcessedSignaled( true )
+ , m_aProcessingThread(0)
+{
+}
+
+SalUserEventList::~SalUserEventList() COVERITY_NOEXCEPT_FALSE
+{
+}
+
+void SalUserEventList::insertFrame( SalFrame* pFrame )
+{
+ auto aPair = m_aFrames.insert( pFrame );
+ assert( aPair.second ); (void) aPair;
+}
+
+void SalUserEventList::eraseFrame( SalFrame* pFrame )
+{
+ auto it = m_aFrames.find( pFrame );
+ assert( it != m_aFrames.end() );
+ if ( it != m_aFrames.end() )
+ m_aFrames.erase( it );
+}
+
+bool SalUserEventList::DispatchUserEvents( bool bHandleAllCurrentEvents )
+{
+ bool bWasEvent = false;
+ oslThreadIdentifier aCurId = osl::Thread::getCurrentIdentifier();
+
+ DBG_TESTSOLARMUTEX();
+ std::unique_lock aResettableListGuard(m_aUserEventsMutex);
+
+ if (!m_aUserEvents.empty())
+ {
+ if (bHandleAllCurrentEvents)
+ {
+ if (m_aProcessingUserEvents.empty())
+ m_aProcessingUserEvents.swap(m_aUserEvents);
+ else
+ m_aProcessingUserEvents.splice(m_aProcessingUserEvents.end(), m_aUserEvents);
+ }
+ else if (m_aProcessingUserEvents.empty())
+ {
+ m_aProcessingUserEvents.push_back( m_aUserEvents.front() );
+ m_aUserEvents.pop_front();
+ }
+ }
+
+ if (HasUserEvents_NoLock())
+ {
+ bWasEvent = true;
+ m_aProcessingThread = aCurId;
+
+ SalUserEvent aEvent( nullptr, nullptr, SalEvent::NONE );
+ do {
+ if (m_aProcessingUserEvents.empty() || aCurId != m_aProcessingThread)
+ break;
+ aEvent = m_aProcessingUserEvents.front();
+ m_aProcessingUserEvents.pop_front();
+
+ // remember to reset the guard before break or continue the loop
+ aResettableListGuard.unlock();
+
+ if ( !isFrameAlive( aEvent.m_pFrame ) )
+ {
+ if ( aEvent.m_nEvent == SalEvent::UserEvent )
+ delete static_cast< ImplSVEvent* >( aEvent.m_pData );
+ aResettableListGuard.lock();
+ continue;
+ }
+
+ /*
+ * Current policy is that scheduler tasks aren't allowed to throw an exception.
+ * Because otherwise the exception is caught somewhere totally unrelated.
+ * TODO Ideally we could capture a proper backtrace and feed this into breakpad,
+ * which is do-able, but requires writing some assembly.
+ * See also Scheduler::CallbackTaskScheduling
+ */
+#ifdef IOS
+ ProcessEvent( aEvent );
+#else
+ // the noexcept here means that (a) we abort and (b) debuggers will
+ // likely trigger at the throw site instead of here, making the debugging
+ // experience better when something goes wrong.
+ auto process = [&aEvent, this] () noexcept { ProcessEvent(aEvent); };
+ process();
+#endif
+ aResettableListGuard.lock();
+ if (!bHandleAllCurrentEvents)
+ break;
+ }
+ while( true );
+ }
+
+ if ( !m_bAllUserEventProcessedSignaled && !HasUserEvents_NoLock() )
+ {
+ m_bAllUserEventProcessedSignaled = true;
+ TriggerAllUserEventsProcessed();
+ }
+
+ return bWasEvent;
+}
+
+void SalUserEventList::RemoveEvent( SalFrame* pFrame, void* pData, SalEvent nEvent )
+{
+ SalUserEvent aEvent( pFrame, pData, nEvent );
+
+ std::unique_lock aGuard( m_aUserEventsMutex );
+ auto it = std::find( m_aUserEvents.begin(), m_aUserEvents.end(), aEvent );
+ if ( it != m_aUserEvents.end() )
+ {
+ m_aUserEvents.erase( it );
+ }
+ else
+ {
+ it = std::find( m_aProcessingUserEvents.begin(), m_aProcessingUserEvents.end(), aEvent );
+ if ( it != m_aProcessingUserEvents.end() )
+ {
+ m_aProcessingUserEvents.erase( it );
+ }
+ }
+
+ if ( !m_bAllUserEventProcessedSignaled && !HasUserEvents_NoLock() )
+ {
+ m_bAllUserEventProcessedSignaled = true;
+ TriggerAllUserEventsProcessed();
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */