1 files changed, 177 insertions, 0 deletions
diff --git a/cppu/source/threadpool/jobqueue.cxx b/cppu/source/threadpool/jobqueue.cxx
new file mode 100644
index 000000000..1be424024
--- /dev/null
+++ b/cppu/source/threadpool/jobqueue.cxx
@@ -0,0 +1,177 @@
+/* -*- 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 <sal/config.h>
+
+#include <cassert>
+
+#include "jobqueue.hxx"
+#include "threadpool.hxx"
+
+namespace cppu_threadpool {
+
+    JobQueue::JobQueue() :
+        m_nToDo( 0 ),
+        m_bSuspended( false ),
+        m_DisposedCallerAdmin( DisposedCallerAdmin::getInstance() )
+    {
+    }
+
+    void JobQueue::add( void *pThreadSpecificData, RequestFun * doRequest )
+    {
+        std::scoped_lock guard( m_mutex );
+        Job job = { pThreadSpecificData , doRequest };
+        m_lstJob.push_back( job );
+        if( ! m_bSuspended )
+        {
+            m_cndWait.notify_all();
+        }
+        m_nToDo ++;
+    }
+
+    void *JobQueue::enter( void const * nDisposeId , bool bReturnWhenNoJob )
+    {
+        void *pReturn = nullptr;
+        {
+            // synchronize with the dispose calls
+            std::scoped_lock guard( m_mutex );
+            if( m_DisposedCallerAdmin->isDisposed( nDisposeId ) )
+            {
+                return nullptr;
+            }
+            m_lstCallstack.push_front( nDisposeId );
+        }
+
+
+        while( true )
+        {
+            struct Job job={nullptr,nullptr};
+            {
+                std::unique_lock guard( m_mutex );
+
+                while (m_bSuspended
+                       || (m_lstCallstack.front() != nullptr && !bReturnWhenNoJob
+                           && m_lstJob.empty()))
+                {
+                    m_cndWait.wait(guard);
+                }
+
+                if( nullptr == m_lstCallstack.front() )
+                {
+                    // disposed !
+                    if (!m_lstJob.empty() && m_lstJob.front().doRequest == nullptr) {
+                        // If this thread was waiting for a remote response, that response may or
+                        // may not have been enqueued; if it has not been enqueued, there cannot be
+                        // another enqueued response, so it is always correct to remove any enqueued
+                        // response here:
+                        m_lstJob.pop_front();
+                    }
+                    break;
+                }
+
+                if( m_lstJob.empty() )
+                {
+                    assert(bReturnWhenNoJob);
+                    break;
+                }
+
+                job = m_lstJob.front();
+                m_lstJob.pop_front();
+            }
+
+            if( job.doRequest )
+            {
+                job.doRequest( job.pThreadSpecificData );
+                std::scoped_lock guard( m_mutex );
+                m_nToDo --;
+            }
+            else
+            {
+                pReturn = job.pThreadSpecificData;
+                std::scoped_lock guard( m_mutex );
+                m_nToDo --;
+                break;
+            }
+        }
+
+        {
+            // synchronize with the dispose calls
+            std::scoped_lock guard( m_mutex );
+            m_lstCallstack.pop_front();
+        }
+
+        return pReturn;
+    }
+
+    void JobQueue::dispose( void const * nDisposeId )
+    {
+        std::scoped_lock guard( m_mutex );
+        for( auto& rId : m_lstCallstack )
+        {
+            if( rId == nDisposeId )
+            {
+                rId = nullptr;
+            }
+        }
+
+        if( !m_lstCallstack.empty()  && ! m_lstCallstack.front() )
+        {
+            // The thread is waiting for a disposed pCallerId, let it go
+            m_cndWait.notify_all();
+        }
+    }
+
+    void JobQueue::suspend()
+    {
+        std::scoped_lock guard( m_mutex );
+        m_bSuspended = true;
+    }
+
+    void JobQueue::resume()
+    {
+        std::scoped_lock guard( m_mutex );
+        m_bSuspended = false;
+        if( ! m_lstJob.empty() )
+        {
+            m_cndWait.notify_all();
+        }
+    }
+
+    bool JobQueue::isEmpty() const
+    {
+        std::scoped_lock guard( m_mutex );
+        return m_lstJob.empty();
+    }
+
+    bool JobQueue::isCallstackEmpty() const
+    {
+        std::scoped_lock guard( m_mutex );
+        return m_lstCallstack.empty();
+    }
+
+    bool JobQueue::isBusy() const
+    {
+        std::scoped_lock guard( m_mutex );
+        return m_nToDo > 0;
+    }
+
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */