1 files changed, 250 insertions, 0 deletions
diff --git a/sw/source/core/docnode/threadmanager.cxx b/sw/source/core/docnode/threadmanager.cxx
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index 000000000..20d71e746
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+++ b/sw/source/core/docnode/threadmanager.cxx
@@ -0,0 +1,250 @@
+/* -*- 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 "cancellablejob.hxx"
+#include "threadmanager.hxx"
+#include <threadlistener.hxx>
+
+#include <osl/diagnose.h>
+
+#include <algorithm>
+
+#include <com/sun/star/util/XJobManager.hpp>
+
+using namespace ::com::sun::star;
+
+/** class to manage threads
+
+    #i73788#
+*/
+const std::deque< ThreadManager::tThreadData >::size_type ThreadManager::snStartedSize = 10;
+
+ThreadManager::ThreadManager( uno::Reference< util::XJobManager > const & rThreadJoiner )
+    : mrThreadJoiner( rThreadJoiner ),
+      mnThreadIDCounter( 0 ),
+      maStartNewThreadIdle("SW ThreadManager StartNewThreadIdle"),
+      mbStartingOfThreadsSuspended( false )
+{
+}
+
+void ThreadManager::Init()
+{
+    mpThreadListener = std::make_shared<ThreadListener>( *this );
+
+    maStartNewThreadIdle.SetPriority( TaskPriority::LOWEST );
+    maStartNewThreadIdle.SetInvokeHandler( LINK( this, ThreadManager, TryToStartNewThread ) );
+}
+
+ThreadManager::~ThreadManager()
+{
+    maWaitingForStartThreads.clear();
+    maStartedThreads.clear();
+}
+
+std::weak_ptr< IFinishedThreadListener > ThreadManager::GetThreadListenerWeakRef() const
+{
+    return mpThreadListener;
+}
+
+void ThreadManager::NotifyAboutFinishedThread( const oslInterlockedCount nThreadID )
+{
+    RemoveThread( nThreadID, true );
+}
+
+oslInterlockedCount ThreadManager::AddThread(
+                            const rtl::Reference< ObservableThread >& rThread )
+
+{
+    std::unique_lock aGuard(maMutex);
+
+    // create new thread
+    tThreadData aThreadData;
+    oslInterlockedCount nNewThreadID( osl_atomic_increment( &mnThreadIDCounter ) );
+    {
+        aThreadData.nThreadID = nNewThreadID;
+
+        aThreadData.pThread = rThread;
+        aThreadData.aJob = new CancellableJob( aThreadData.pThread );
+
+        aThreadData.pThread->setPriority( osl_Thread_PriorityBelowNormal );
+        mpThreadListener->ListenToThread( aThreadData.nThreadID,
+                                          *(aThreadData.pThread) );
+    }
+
+    // add thread to manager
+    if ( maStartedThreads.size() < snStartedSize &&
+         !mbStartingOfThreadsSuspended )
+    {
+        // Try to start thread
+        if ( !StartThread( aThreadData ) )
+        {
+            // No success on starting thread
+            // If no more started threads exist, but still threads are waiting,
+            // setup Timer to start thread from waiting ones
+            if ( maStartedThreads.empty() && !maWaitingForStartThreads.empty() )
+            {
+                maStartNewThreadIdle.Start();
+            }
+        }
+    }
+    else
+    {
+        // Thread will be started later
+        maWaitingForStartThreads.push_back( aThreadData );
+    }
+
+    return nNewThreadID;
+}
+
+void ThreadManager::RemoveThread( const oslInterlockedCount nThreadID,
+                                  const bool bThreadFinished )
+{
+    // --> SAFE ----
+    std::unique_lock aGuard(maMutex);
+
+    std::deque< tThreadData >::iterator aIter =
+                std::find_if( maStartedThreads.begin(), maStartedThreads.end(),
+                              ThreadPred( nThreadID ) );
+
+    if ( aIter != maStartedThreads.end() )
+    {
+        tThreadData aTmpThreadData( *aIter );
+
+        maStartedThreads.erase( aIter );
+
+        if ( bThreadFinished )
+        {
+            // release thread as job from thread joiner instance
+            css::uno::Reference< css::util::XJobManager > rThreadJoiner( mrThreadJoiner );
+            if ( rThreadJoiner.is() )
+            {
+                rThreadJoiner->releaseJob( aTmpThreadData.aJob );
+            }
+            else
+            {
+                OSL_FAIL( "<ThreadManager::RemoveThread(..)> - ThreadJoiner already gone!" );
+            }
+        }
+
+        // Try to start thread from waiting ones
+        aGuard.unlock();
+        TryToStartNewThread( nullptr );
+    }
+    else
+    {
+        aIter = std::find_if( maWaitingForStartThreads.begin(),
+                              maWaitingForStartThreads.end(), ThreadPred( nThreadID ) );
+
+        if ( aIter != maWaitingForStartThreads.end() )
+        {
+            maWaitingForStartThreads.erase( aIter );
+        }
+    }
+    // <-- SAFE ----
+}
+
+bool ThreadManager::StartWaitingThread()
+{
+    if ( !maWaitingForStartThreads.empty() )
+    {
+        tThreadData aThreadData( maWaitingForStartThreads.front() );
+        maWaitingForStartThreads.pop_front();
+        return StartThread( aThreadData );
+    }
+    else
+    {
+        return false;
+    }
+}
+
+bool ThreadManager::StartThread( const tThreadData& rThreadData )
+{
+    bool bThreadStarted( false );
+
+    if ( rThreadData.pThread->create() )
+    {
+        // start of thread successful.
+        bThreadStarted = true;
+
+        maStartedThreads.push_back( rThreadData );
+
+        // register thread as job at thread joiner instance
+        css::uno::Reference< css::util::XJobManager > rThreadJoiner( mrThreadJoiner );
+        if ( rThreadJoiner.is() )
+        {
+            rThreadJoiner->registerJob( rThreadData.aJob );
+        }
+        else
+        {
+            OSL_FAIL( "<ThreadManager::StartThread(..)> - ThreadJoiner already gone!" );
+        }
+    }
+    else
+    {
+        // thread couldn't be started.
+        maWaitingForStartThreads.push_front( rThreadData );
+    }
+
+    return bThreadStarted;
+}
+
+IMPL_LINK_NOARG(ThreadManager, TryToStartNewThread, Timer *, void)
+{
+    std::unique_lock aGuard(maMutex);
+
+    if ( mbStartingOfThreadsSuspended )
+        return;
+
+    // Try to start thread from waiting ones
+    if ( !StartWaitingThread() )
+    {
+        // No success on starting thread
+        // If no more started threads exist, but still threads are waiting,
+        // setup Timer to start thread from waiting ones
+        if ( maStartedThreads.empty() && !maWaitingForStartThreads.empty() )
+        {
+            maStartNewThreadIdle.Start();
+        }
+    }
+}
+
+void ThreadManager::ResumeStartingOfThreads()
+{
+    std::unique_lock aGuard(maMutex);
+
+    mbStartingOfThreadsSuspended = false;
+
+    while ( maStartedThreads.size() < snStartedSize &&
+            !maWaitingForStartThreads.empty() )
+    {
+        if ( !StartWaitingThread() )
+        {
+            // No success on starting thread
+            // If no more started threads exist, but still threads are waiting,
+            // setup Timer to start thread from waiting ones
+            if ( maStartedThreads.empty() && !maWaitingForStartThreads.empty() )
+            {
+                maStartNewThreadIdle.Start();
+                break;
+            }
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */