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diff --git a/vcl/inc/headless/svpinst.hxx b/vcl/inc/headless/svpinst.hxx
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+++ b/vcl/inc/headless/svpinst.hxx
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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 .
+ */
+
+#ifndef INCLUDED_VCL_INC_HEADLESS_SVPINST_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPINST_HXX
+
+#include <osl/thread.hxx>
+#include <osl/conditn.hxx>
+#include <salinst.hxx>
+#include <saltimer.hxx>
+#include <salusereventlist.hxx>
+#include <unx/geninst.h>
+#include <unx/genprn.h>
+
+#include <condition_variable>
+
+#include <sys/time.h>
+
+#define VIRTUAL_DESKTOP_WIDTH 1024
+#define VIRTUAL_DESKTOP_HEIGHT 768
+
+#ifdef IOS
+#define SvpSalInstance AquaSalInstance
+#endif
+
+class SvpSalInstance;
+class SvpSalTimer final : public SalTimer
+{
+    SvpSalInstance* m_pInstance;
+public:
+    SvpSalTimer( SvpSalInstance* pInstance ) : m_pInstance( pInstance ) {}
+    virtual ~SvpSalTimer() override;
+
+    // override all pure virtual methods
+    virtual void Start( sal_uInt64 nMS ) override;
+    virtual void Stop() override;
+};
+
+class SvpSalFrame;
+class GenPspGraphics;
+
+enum class SvpRequest
+{
+    NONE,
+    MainThreadDispatchOneEvent,
+    MainThreadDispatchAllEvents,
+};
+
+class SvpSalYieldMutex final : public SalYieldMutex
+{
+private:
+    // note: these members might as well live in SvpSalInstance, but there is
+    // at least one subclass of SvpSalInstance (GTK3) that doesn't use them.
+    friend class SvpSalInstance;
+    // members for communication from main thread to non-main thread
+    int                     m_FeedbackFDs[2];
+    osl::Condition          m_NonMainWaitingYieldCond;
+    // members for communication from non-main thread to main thread
+    bool                    m_bNoYieldLock = false; // accessed only on main thread
+    std::mutex              m_WakeUpMainMutex; // guard m_wakeUpMain & m_Request
+    std::condition_variable m_WakeUpMainCond;
+    bool                    m_wakeUpMain = false;
+    SvpRequest              m_Request = SvpRequest::NONE;
+
+    virtual void            doAcquire( sal_uInt32 nLockCount ) override;
+    virtual sal_uInt32      doRelease( bool bUnlockAll ) override;
+
+public:
+    SvpSalYieldMutex();
+    virtual ~SvpSalYieldMutex() override;
+
+    virtual bool IsCurrentThread() const override;
+};
+
+// NOTE: the functions IsMainThread, DoYield and Wakeup *require* the use of
+// SvpSalYieldMutex; if a subclass uses something else it must override these
+// (Wakeup is only called by SvpSalTimer and SvpSalFrame)
+class VCL_DLLPUBLIC SvpSalInstance : public SalGenericInstance, public SalUserEventList
+{
+    timeval                 m_aTimeout;
+    sal_uLong               m_nTimeoutMS;
+    oslThreadIdentifier     m_MainThread;
+
+    virtual void            TriggerUserEventProcessing() override;
+    virtual void            ProcessEvent( SalUserEvent aEvent ) override;
+    bool ImplYield(bool bWait, bool bHandleAllCurrentEvents);
+
+public:
+    static SvpSalInstance*  s_pDefaultInstance;
+
+    SvpSalInstance( std::unique_ptr<SalYieldMutex> pMutex );
+    virtual ~SvpSalInstance() override;
+
+    void                    CloseWakeupPipe(bool log);
+    void                    CreateWakeupPipe(bool log);
+    void                    Wakeup(SvpRequest request = SvpRequest::NONE);
+
+    void                    StartTimer( sal_uInt64 nMS );
+    void                    StopTimer();
+
+    inline void             registerFrame( SalFrame* pFrame );
+    inline void             deregisterFrame( SalFrame* pFrame );
+
+    bool                    CheckTimeout( bool bExecuteTimers = true );
+
+    // Frame
+    virtual SalFrame*       CreateChildFrame( SystemParentData* pParent, SalFrameStyleFlags nStyle ) override;
+    virtual SalFrame*       CreateFrame( SalFrame* pParent, SalFrameStyleFlags nStyle ) override;
+    virtual void            DestroyFrame( SalFrame* pFrame ) override;
+
+    // Object (System Child Window)
+    virtual SalObject*      CreateObject( SalFrame* pParent, SystemWindowData* pWindowData, bool bShow ) override;
+    virtual void            DestroyObject( SalObject* pObject ) override;
+
+    // VirtualDevice
+    // nDX and nDY in Pixel
+    // nBitCount: 0 == Default(=as window) / 1 == Mono
+    // pData allows for using a system dependent graphics or device context
+    virtual std::unique_ptr<SalVirtualDevice>
+                            CreateVirtualDevice( SalGraphics& rGraphics,
+                                                     tools::Long &nDX, tools::Long &nDY,
+                                                     DeviceFormat eFormat, const SystemGraphicsData *pData = nullptr ) override;
+
+    // Printer
+    // pSetupData->mpDriverData can be 0
+    // pSetupData must be updated with the current
+    // JobSetup
+    virtual SalInfoPrinter* CreateInfoPrinter( SalPrinterQueueInfo* pQueueInfo,
+                                               ImplJobSetup* pSetupData ) override;
+    virtual void            DestroyInfoPrinter( SalInfoPrinter* pPrinter ) override;
+    virtual std::unique_ptr<SalPrinter> CreatePrinter( SalInfoPrinter* pInfoPrinter ) override;
+
+    virtual void            GetPrinterQueueInfo( ImplPrnQueueList* pList ) override;
+    virtual void            GetPrinterQueueState( SalPrinterQueueInfo* pInfo ) override;
+    virtual OUString        GetDefaultPrinter() override;
+    virtual void            PostPrintersChanged() override;
+
+    // SalTimer
+    virtual SalTimer*       CreateSalTimer() override;
+    // SalSystem
+    virtual SalSystem*      CreateSalSystem() override;
+    // SalBitmap
+    virtual std::shared_ptr<SalBitmap> CreateSalBitmap() override;
+
+    // wait next event and dispatch
+    // must returned by UserEvent (SalFrame::PostEvent)
+    // and timer
+    virtual bool            DoYield(bool bWait, bool bHandleAllCurrentEvents) override;
+    virtual bool            AnyInput( VclInputFlags nType ) override;
+    virtual bool            IsMainThread() const override;
+    virtual void            updateMainThread() override;
+
+    virtual OUString        GetConnectionIdentifier() override;
+
+    virtual void            AddToRecentDocumentList(const OUString& rFileUrl, const OUString& rMimeType, const OUString& rDocumentService) override;
+
+    virtual std::unique_ptr<GenPspGraphics> CreatePrintGraphics() override;
+
+    virtual const cairo_font_options_t* GetCairoFontOptions() override;
+};
+
+inline void SvpSalInstance::registerFrame( SalFrame* pFrame )
+{
+    insertFrame( pFrame );
+}
+
+inline void SvpSalInstance::deregisterFrame( SalFrame* pFrame )
+{
+    eraseFrame( pFrame );
+}
+
+VCL_DLLPUBLIC cairo_surface_t* get_underlying_cairo_surface(const VirtualDevice& rDevice);
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPINST_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */