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Diffstat (limited to '')
| -rw-r--r-- | vcl/win/dtrans/MtaOleClipb.cxx | 754 |
1 files changed, 754 insertions, 0 deletions
diff --git a/vcl/win/dtrans/MtaOleClipb.cxx b/vcl/win/dtrans/MtaOleClipb.cxx new file mode 100644 index 000000000..865025057 --- /dev/null +++ b/vcl/win/dtrans/MtaOleClipb.cxx @@ -0,0 +1,754 @@ +/* -*- 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 . + */ + +/* + MtaOleClipb.cxx - documentation + + This class setup a single threaded apartment (sta) thread to deal with + the ole clipboard, which runs only in an sta thread. + The consequence is that callback from the ole clipboard are in the + context of this sta thread. In the soffice applications this may lead + to problems because they all use the one and only mutex called + SolarMutex. + In order to transfer clipboard requests to our sta thread we use a + hidden window and forward these requests via window messages. +*/ + +#include <osl/diagnose.h> +#include <sal/log.hxx> + +#include "MtaOleClipb.hxx" + +#include <svsys.h> +#include <win/saldata.hxx> + +#include <osl/thread.h> + +#include <wchar.h> +#include <process.h> + +#include <systools/win32/comtools.hxx> +#include <systools/win32/retry_if_failed.hxx> + +#include <comphelper/windowserrorstring.hxx> + +// namespace directives + +using osl::MutexGuard; +using osl::ClearableMutexGuard; + +namespace /* private */ +{ + const wchar_t g_szWndClsName[] = L"MtaOleReqWnd###"; + + // messages constants + + const sal_uInt32 MSG_SETCLIPBOARD = WM_USER + 0x0001; + const sal_uInt32 MSG_GETCLIPBOARD = WM_USER + 0x0002; + const sal_uInt32 MSG_REGCLIPVIEWER = WM_USER + 0x0003; + const sal_uInt32 MSG_FLUSHCLIPBOARD = WM_USER + 0x0004; + const sal_uInt32 MSG_SHUTDOWN = WM_USER + 0x0005; + + const sal_uInt32 MAX_WAITTIME = 10000; // msec + const sal_uInt32 MAX_WAIT_SHUTDOWN = 10000; // msec + + const bool MANUAL_RESET = true; + const bool INIT_NONSIGNALED = false; + + /* Cannot use osl conditions because they are blocking + without waking up on messages sent by another thread + this leads to deadlocks because we are blocking the + communication between inter-thread marshalled COM + pointers. + COM Proxy-Stub communication uses SendMessages for + synchronization purposes. + */ + class Win32Condition + { + public: + Win32Condition() = default; + + ~Win32Condition() { CloseHandle(m_hEvent); } + + // wait infinite for own event (or abort event) be signaled + // leave messages sent through + bool wait(HANDLE hEvtAbort) + { + const HANDLE hWaitArray[2] = { m_hEvent, hEvtAbort }; + while (true) + { + DWORD dwResult + = MsgWaitForMultipleObjects(2, hWaitArray, FALSE, INFINITE, QS_SENDMESSAGE); + + switch (dwResult) + { + case WAIT_OBJECT_0: // wait successful + return true; + + case WAIT_OBJECT_0 + 1: // wait aborted + return false; + + case WAIT_OBJECT_0 + 2: + { + /* PeekMessage processes all messages in the SendMessage + queue that's what we want, messages from the PostMessage + queue stay untouched */ + MSG msg; + PeekMessageW(&msg, nullptr, 0, 0, PM_NOREMOVE); + + break; + } + + default: // WAIT_FAILED? + return false; + } + } + } + + // set the event + void set() { SetEvent(m_hEvent); } + + private: + HANDLE m_hEvent = CreateEventW(nullptr, MANUAL_RESET, INIT_NONSIGNALED, nullptr); + + // prevent copy/assignment + Win32Condition(const Win32Condition&) = delete; + Win32Condition& operator=(const Win32Condition&) = delete; + }; + + // we use one condition for every request + + struct MsgCtx + { + Win32Condition aCondition; + HRESULT hr; + }; + +} /* namespace private */ + +// static member initialization + +CMtaOleClipboard* CMtaOleClipboard::s_theMtaOleClipboardInst = nullptr; + +// marshal an IDataObject + +//inline +static HRESULT MarshalIDataObjectInStream( IDataObject* pIDataObject, LPSTREAM* ppStream ) +{ + OSL_ASSERT( nullptr != pIDataObject ); + OSL_ASSERT( nullptr != ppStream ); + + *ppStream = nullptr; + return CoMarshalInterThreadInterfaceInStream( + __uuidof(IDataObject), //The IID of interface to be marshalled + pIDataObject, //The interface pointer + ppStream //IStream pointer + ); +} + +// unmarshal an IDataObject + +//inline +static HRESULT UnmarshalIDataObjectAndReleaseStream( LPSTREAM lpStream, IDataObject** ppIDataObject ) +{ + OSL_ASSERT( nullptr != lpStream ); + OSL_ASSERT( nullptr != ppIDataObject ); + + *ppIDataObject = nullptr; + return CoGetInterfaceAndReleaseStream( + lpStream, + __uuidof(IDataObject), + reinterpret_cast<LPVOID*>(ppIDataObject)); +} + +// helper class to ensure that the calling thread has com initialized + +namespace { + +class CAutoComInit +{ +public: + /* + to be safe we call CoInitializeEx + although it is not necessary if + the calling thread was created + using osl_CreateThread because + this function calls CoInitializeEx + for every thread it creates + */ + CAutoComInit( ) : m_hResult( CoInitializeEx( nullptr, COINIT_APARTMENTTHREADED ) ) + { + if ( S_OK == m_hResult ) + OSL_FAIL( + "com was not yet initialized, the thread was not created using osl_createThread" ); + else if ( FAILED( m_hResult ) && !( RPC_E_CHANGED_MODE == m_hResult ) ) + OSL_FAIL( + "com could not be initialized, maybe the thread was not created using osl_createThread" ); + } + + ~CAutoComInit( ) + { + /* + we only call CoUninitialize when + CoInitializeEx returned S_FALSE, what + means that com was already initialize + for that thread so we keep the balance + if CoInitializeEx returned S_OK what means + com was not yet initialized we better + let com initialized or we may run into + the realm of undefined behaviour + */ + if ( m_hResult == S_FALSE ) + CoUninitialize( ); + } + +private: + HRESULT m_hResult; +}; + +} + +// ctor + +CMtaOleClipboard::CMtaOleClipboard( ) : + m_hOleThread( nullptr ), + m_uOleThreadId( 0 ), + // signals that the thread was successfully setup + m_hEvtThrdReady(CreateEventW( nullptr, MANUAL_RESET, INIT_NONSIGNALED, nullptr )), + m_hwndMtaOleReqWnd( nullptr ), + // signals that the window is destroyed - to stop waiting any winproc result + m_hEvtWndDisposed(CreateEventW(nullptr, MANUAL_RESET, INIT_NONSIGNALED, nullptr)), + m_MtaOleReqWndClassAtom( 0 ), + m_pfncClipViewerCallback( nullptr ), + m_bRunClipboardNotifierThread( true ), + m_hClipboardChangedEvent( m_hClipboardChangedNotifierEvents[0] ), + m_hTerminateClipboardChangedNotifierEvent( m_hClipboardChangedNotifierEvents[1] ), + m_ClipboardChangedEventCount( 0 ) +{ + OSL_ASSERT( nullptr != m_hEvtThrdReady ); + SAL_WARN_IF(!m_hEvtWndDisposed, "vcl.win.dtrans", "CreateEventW failed: m_hEvtWndDisposed is nullptr"); + + s_theMtaOleClipboardInst = this; + + m_hOleThread = CreateThread( + nullptr, 0, CMtaOleClipboard::oleThreadProc, this, 0, &m_uOleThreadId ); + OSL_ASSERT( nullptr != m_hOleThread ); + + // setup the clipboard changed notifier thread + + m_hClipboardChangedNotifierEvents[0] = CreateEventW( nullptr, MANUAL_RESET, INIT_NONSIGNALED, nullptr ); + OSL_ASSERT( nullptr != m_hClipboardChangedNotifierEvents[0] ); + + m_hClipboardChangedNotifierEvents[1] = CreateEventW( nullptr, MANUAL_RESET, INIT_NONSIGNALED, nullptr ); + OSL_ASSERT( nullptr != m_hClipboardChangedNotifierEvents[1] ); + + DWORD uThreadId; + m_hClipboardChangedNotifierThread = CreateThread( + nullptr, 0, CMtaOleClipboard::clipboardChangedNotifierThreadProc, this, 0, &uThreadId ); + + OSL_ASSERT( nullptr != m_hClipboardChangedNotifierThread ); +} + +// dtor + +CMtaOleClipboard::~CMtaOleClipboard( ) +{ + // block calling threads out + if ( nullptr != m_hEvtThrdReady ) + ResetEvent( m_hEvtThrdReady ); + + // terminate the clipboard changed notifier thread + m_bRunClipboardNotifierThread = false; + SetEvent( m_hTerminateClipboardChangedNotifierEvent ); + + // unblock whoever could still wait for event processing + if (m_hEvtWndDisposed) + SetEvent(m_hEvtWndDisposed); + + sal_uInt32 dwResult = WaitForSingleObject( + m_hClipboardChangedNotifierThread, MAX_WAIT_SHUTDOWN ); + + OSL_ENSURE( dwResult == WAIT_OBJECT_0, "clipboard notifier thread could not terminate" ); + + if ( nullptr != m_hClipboardChangedNotifierThread ) + CloseHandle( m_hClipboardChangedNotifierThread ); + + if ( nullptr != m_hClipboardChangedNotifierEvents[0] ) + CloseHandle( m_hClipboardChangedNotifierEvents[0] ); + + if ( nullptr != m_hClipboardChangedNotifierEvents[1] ) + CloseHandle( m_hClipboardChangedNotifierEvents[1] ); + + // end the thread + // because DestroyWindow can only be called + // from within the thread that created the window + sendMessage( MSG_SHUTDOWN ); + + // wait for thread shutdown + dwResult = WaitForSingleObject( m_hOleThread, MAX_WAIT_SHUTDOWN ); + OSL_ENSURE( dwResult == WAIT_OBJECT_0, "OleThread could not terminate" ); + + if ( nullptr != m_hOleThread ) + CloseHandle( m_hOleThread ); + + if ( nullptr != m_hEvtThrdReady ) + CloseHandle( m_hEvtThrdReady ); + + if (m_hEvtWndDisposed) + CloseHandle(m_hEvtWndDisposed); + + if ( m_MtaOleReqWndClassAtom ) + UnregisterClassW( g_szWndClsName, nullptr ); + + OSL_ENSURE( ( nullptr == m_pfncClipViewerCallback ), + "Clipboard viewer not properly unregistered" ); +} + +HRESULT CMtaOleClipboard::flushClipboard( ) +{ + if ( !WaitForThreadReady( ) ) + { + OSL_FAIL( "clipboard sta thread not ready" ); + return E_FAIL; + } + + OSL_ENSURE( GetCurrentThreadId( ) != m_uOleThreadId, + "flushClipboard from within clipboard sta thread called" ); + + MsgCtx aMsgCtx; + + const bool bWaitSuccess = postMessage(MSG_FLUSHCLIPBOARD, 0, reinterpret_cast<LPARAM>(&aMsgCtx)) + && aMsgCtx.aCondition.wait(m_hEvtWndDisposed); + + return bWaitSuccess ? aMsgCtx.hr : E_ABORT; +} + +HRESULT CMtaOleClipboard::getClipboard( IDataObject** ppIDataObject ) +{ + OSL_PRECOND( nullptr != ppIDataObject, "invalid parameter" ); + OSL_PRECOND( GetCurrentThreadId( ) != m_uOleThreadId, "getClipboard from within clipboard sta thread called" ); + + if ( !WaitForThreadReady( ) ) + { + OSL_FAIL( "clipboard sta thread not ready" ); + return E_FAIL; + } + + CAutoComInit comAutoInit; + + LPSTREAM lpStream; + + *ppIDataObject = nullptr; + + MsgCtx aMsgCtx; + + const bool bWaitSuccess = postMessage(MSG_GETCLIPBOARD, reinterpret_cast<WPARAM>(&lpStream), + reinterpret_cast<LPARAM>(&aMsgCtx)) + && aMsgCtx.aCondition.wait(m_hEvtWndDisposed); + + HRESULT hr = bWaitSuccess ? aMsgCtx.hr : E_ABORT; + + if ( SUCCEEDED( hr ) ) + { + hr = UnmarshalIDataObjectAndReleaseStream( lpStream, ppIDataObject ); + OSL_ENSURE( SUCCEEDED( hr ), "unmarshalling clipboard data object failed" ); + } + + return hr; +} + +// this is an asynchronous method that's why we don't wait until the +// request is completed + +HRESULT CMtaOleClipboard::setClipboard( IDataObject* pIDataObject ) +{ + if ( !WaitForThreadReady( ) ) + { + OSL_FAIL( "clipboard sta thread not ready" ); + return E_FAIL; + } + + CAutoComInit comAutoInit; + + OSL_ENSURE( GetCurrentThreadId( ) != m_uOleThreadId, "setClipboard from within the clipboard sta thread called" ); + + // because we marshall this request + // into the sta thread we better + // acquire the interface here so + // that the object will not be + // destroyed before the ole clipboard + // can acquire it + // remember: pIDataObject may be NULL + // which is a request to clear the + // current clipboard content + if ( pIDataObject ) + pIDataObject->AddRef( ); + + postMessage( + MSG_SETCLIPBOARD, + reinterpret_cast< WPARAM >( pIDataObject ) ); + + // because this is an asynchronous function + // the return value is useless + return S_OK; +} + +// register a clipboard viewer + +bool CMtaOleClipboard::registerClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncClipViewerCallback ) +{ + if ( !WaitForThreadReady( ) ) + { + OSL_FAIL( "clipboard sta thread not ready" ); + return false; + } + + OSL_ENSURE( GetCurrentThreadId( ) != m_uOleThreadId, "registerClipViewer from within the OleThread called" ); + + MsgCtx aMsgCtx; + + if (postMessage(MSG_REGCLIPVIEWER, reinterpret_cast<WPARAM>(pfncClipViewerCallback), + reinterpret_cast<LPARAM>(&aMsgCtx))) + aMsgCtx.aCondition.wait(m_hEvtWndDisposed); + + return false; +} + +// register a clipboard viewer + +bool CMtaOleClipboard::onRegisterClipViewer( LPFNC_CLIPVIEWER_CALLBACK_t pfncClipViewerCallback ) +{ + bool bRet = false; + + // we need exclusive access because the clipboard changed notifier + // thread also accesses this variable + MutexGuard aGuard( m_pfncClipViewerCallbackMutex ); + + // register if not yet done + if ( ( nullptr != pfncClipViewerCallback ) && ( nullptr == m_pfncClipViewerCallback ) ) + { + // SetClipboardViewer sends a WM_DRAWCLIPBOARD message we ignore + // this message if we register ourself as clip viewer + m_bInRegisterClipViewer = true; + bRet = AddClipboardFormatListener(m_hwndMtaOleReqWnd); + m_bInRegisterClipViewer = false; + + // save the new callback function + m_pfncClipViewerCallback = pfncClipViewerCallback; + } + else if ( ( nullptr == pfncClipViewerCallback ) && ( nullptr != m_pfncClipViewerCallback ) ) + { + m_pfncClipViewerCallback = nullptr; + + // unregister if input parameter is NULL and we previously registered + // as clipboard viewer + bRet = RemoveClipboardFormatListener(m_hwndMtaOleReqWnd); + } + + return bRet; +} + +HRESULT CMtaOleClipboard::onSetClipboard( IDataObject* pIDataObject ) +{ + return sal::systools::RetryIfFailed(10, 100, + [pIDataObject] { return OleSetClipboard(pIDataObject); }); +} + +HRESULT CMtaOleClipboard::onGetClipboard( LPSTREAM* ppStream ) +{ + OSL_ASSERT(nullptr != ppStream); + + IDataObjectPtr pIDataObject; + + // forward the request to the OleClipboard + HRESULT hr + = sal::systools::RetryIfFailed(10, 100, [p = &pIDataObject] { return OleGetClipboard(p); }); + if ( SUCCEEDED( hr ) ) + { + hr = MarshalIDataObjectInStream(pIDataObject.get(), ppStream); + OSL_ENSURE(SUCCEEDED(hr), "marshalling clipboard data object failed"); + } + return hr; +} + +// flush the ole-clipboard + +HRESULT CMtaOleClipboard::onFlushClipboard( ) +{ + return sal::systools::RetryIfFailed(10, 100, [] { return OleFlushClipboard(); }); +} + +// handle clipboard update event + +LRESULT CMtaOleClipboard::onClipboardUpdate() +{ + // we don't send a notification if we are + // registering ourself as clipboard + if ( !m_bInRegisterClipViewer ) + { + MutexGuard aGuard( m_ClipboardChangedEventCountMutex ); + + m_ClipboardChangedEventCount++; + SetEvent( m_hClipboardChangedEvent ); + } + + return 0; +} + +// SendMessage so we don't need to supply the HWND if we send +// something to our wrapped window + +LRESULT CMtaOleClipboard::sendMessage( UINT msg, WPARAM wParam, LPARAM lParam ) +{ + return ::SendMessageW( m_hwndMtaOleReqWnd, msg, wParam, lParam ); +} + +// PostMessage so we don't need to supply the HWND if we send +// something to our wrapped window + +bool CMtaOleClipboard::postMessage( UINT msg, WPARAM wParam, LPARAM lParam ) +{ + bool const ret = PostMessageW(m_hwndMtaOleReqWnd, msg, wParam, lParam); + SAL_WARN_IF(!ret, "vcl.win.dtrans", "ERROR: PostMessage() failed!"); + return ret; +} + +// the window proc + +LRESULT CALLBACK CMtaOleClipboard::mtaOleReqWndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) +{ + LRESULT lResult = 0; + + // get a connection to the class-instance via the static member + CMtaOleClipboard* pImpl = CMtaOleClipboard::s_theMtaOleClipboardInst; + OSL_ASSERT( nullptr != pImpl ); + + switch( uMsg ) + { + case MSG_SETCLIPBOARD: + { + IDataObject* pIDataObject = reinterpret_cast< IDataObject* >( wParam ); + CMtaOleClipboard::onSetClipboard( pIDataObject ); + + // in setClipboard we did acquire the + // interface pointer in order to prevent + // destruction of the object before the + // ole clipboard can acquire the interface + // now we release the interface so that + // our lostOwnership mechanism works + // remember: pIDataObject may be NULL + if ( pIDataObject ) + pIDataObject->Release( ); + } + break; + + case MSG_GETCLIPBOARD: + { + MsgCtx* aMsgCtx = reinterpret_cast< MsgCtx* >( lParam ); + OSL_ASSERT( aMsgCtx ); + + aMsgCtx->hr = CMtaOleClipboard::onGetClipboard( reinterpret_cast< LPSTREAM* >(wParam) ); + aMsgCtx->aCondition.set( ); + } + break; + + case MSG_FLUSHCLIPBOARD: + { + MsgCtx* aMsgCtx = reinterpret_cast< MsgCtx* >( lParam ); + OSL_ASSERT( aMsgCtx ); + + aMsgCtx->hr = CMtaOleClipboard::onFlushClipboard( ); + aMsgCtx->aCondition.set( ); + } + break; + + case MSG_REGCLIPVIEWER: + { + MsgCtx* pMsgCtx = reinterpret_cast<MsgCtx*>(lParam); + SAL_WARN_IF(!pMsgCtx, "vcl.win.dtrans", "pMsgCtx is nullptr"); + + pImpl->onRegisterClipViewer( + reinterpret_cast<CMtaOleClipboard::LPFNC_CLIPVIEWER_CALLBACK_t>(wParam)); + pMsgCtx->aCondition.set(); + } + break; + + case WM_CLIPBOARDUPDATE: + lResult = pImpl->onClipboardUpdate(); + break; + + case MSG_SHUTDOWN: + DestroyWindow( pImpl->m_hwndMtaOleReqWnd ); + break; + + // force the sta thread to end + case WM_DESTROY: + SetEvent(pImpl->m_hEvtWndDisposed); // stop waiting for conditions set by this wndproc + PostQuitMessage( 0 ); + break; + + default: + lResult = DefWindowProcW( hWnd, uMsg, wParam, lParam ); + break; + } + + return lResult; +} + +void CMtaOleClipboard::createMtaOleReqWnd( ) +{ + WNDCLASSEXW wcex; + + SalData* pSalData = GetSalData(); + OSL_ASSERT(nullptr != pSalData->mhInst); + + ZeroMemory( &wcex, sizeof(wcex) ); + + wcex.cbSize = sizeof(wcex); + wcex.style = 0; + wcex.lpfnWndProc = CMtaOleClipboard::mtaOleReqWndProc; + wcex.cbClsExtra = 0; + wcex.cbWndExtra = 0; + wcex.hInstance = pSalData->mhInst; + wcex.hIcon = nullptr; + wcex.hCursor = nullptr; + wcex.hbrBackground = nullptr; + wcex.lpszMenuName = nullptr; + wcex.lpszClassName = g_szWndClsName; + wcex.hIconSm = nullptr; + + m_MtaOleReqWndClassAtom = RegisterClassExW( &wcex ); + + if ( 0 != m_MtaOleReqWndClassAtom ) + m_hwndMtaOleReqWnd = CreateWindowW( + g_szWndClsName, nullptr, 0, 0, 0, 0, 0, nullptr, nullptr, pSalData->mhInst, nullptr ); +} + +unsigned int CMtaOleClipboard::run( ) +{ + HRESULT hr = OleInitialize( nullptr ); + OSL_ASSERT( SUCCEEDED( hr ) ); + + createMtaOleReqWnd( ); + + unsigned int nRet = ~0U; // = error + + if ( IsWindow( m_hwndMtaOleReqWnd ) ) + { + if ( nullptr != m_hEvtThrdReady ) + SetEvent( m_hEvtThrdReady ); + + nRet = 0; + + // pumping messages + for (;;) + { + MSG msg; + int const bRet = GetMessageW(&msg, nullptr, 0, 0); + if (bRet == 0) + { + break; + } + if (-1 == bRet) + { + SAL_WARN("vcl.win.dtrans", "GetMessageW failed: " << WindowsErrorString(GetLastError())); + nRet = ~0U; + break; + } + DispatchMessageW(&msg); + } + } + + OleUninitialize( ); + + return nRet; +} + +DWORD WINAPI CMtaOleClipboard::oleThreadProc( _In_ LPVOID pParam ) +{ + osl_setThreadName("CMtaOleClipboard::run()"); + + CMtaOleClipboard* pInst = + static_cast<CMtaOleClipboard*>( pParam ); + OSL_ASSERT( nullptr != pInst ); + + return pInst->run( ); +} + +DWORD WINAPI CMtaOleClipboard::clipboardChangedNotifierThreadProc( _In_ LPVOID pParam ) +{ + osl_setThreadName("CMtaOleClipboard::clipboardChangedNotifierThreadProc()"); + CMtaOleClipboard* pInst = static_cast< CMtaOleClipboard* >( pParam ); + OSL_ASSERT( nullptr != pInst ); + + sal::systools::CoInitializeGuard aGuard(COINIT_APARTMENTTHREADED, false, + sal::systools::CoInitializeGuard::WhenFailed::NoThrow); + + // assuming we don't need a lock for + // a boolean variable like m_bRun... + while ( pInst->m_bRunClipboardNotifierThread ) + { + // process window messages because of CoInitializeEx + MSG Msg; + while (PeekMessageW(&Msg, nullptr, 0, 0, PM_REMOVE)) + DispatchMessageW(&Msg); + + // wait for clipboard changed or terminate event + MsgWaitForMultipleObjects(2, pInst->m_hClipboardChangedNotifierEvents, false, INFINITE, + QS_ALLINPUT | QS_ALLPOSTMESSAGE); + + ClearableMutexGuard aGuard2( pInst->m_ClipboardChangedEventCountMutex ); + + if ( pInst->m_ClipboardChangedEventCount > 0 ) + { + pInst->m_ClipboardChangedEventCount--; + if ( 0 == pInst->m_ClipboardChangedEventCount ) + ResetEvent( pInst->m_hClipboardChangedEvent ); + + aGuard2.clear( ); + + // nobody should touch m_pfncClipViewerCallback while we do + MutexGuard aClipViewerGuard( pInst->m_pfncClipViewerCallbackMutex ); + + // notify all clipboard listener + if ( pInst->m_pfncClipViewerCallback ) + pInst->m_pfncClipViewerCallback( ); + } + else + aGuard2.clear( ); + } + + return 0; +} + +bool CMtaOleClipboard::WaitForThreadReady( ) const +{ + bool bRet = false; + + if ( nullptr != m_hEvtThrdReady ) + { + DWORD dwResult = WaitForSingleObject( + m_hEvtThrdReady, MAX_WAITTIME ); + bRet = ( dwResult == WAIT_OBJECT_0 ); + } + + return bRet; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |