asynclink.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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
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#include <svtools/asynclink.hxx>
#include <tools/debug.hxx>
#include <vcl/svapp.hxx>
 
 
namespace svtools {
 
void AsynchronLink::Call( void* pObj, bool bAllowDoubles )
{
    if( !_aLink.IsSet() )
        return;
 
    _pArg = pObj;
    DBG_ASSERT( bAllowDoubles ||  !_nEventId, "Already made a call" );
    ClearPendingCall();
    std::scoped_lock aGuard(_aMutex);
    _nEventId = Application::PostUserEvent( LINK( this, AsynchronLink, HandleCall_PostUserEvent) );
}
 
AsynchronLink::~AsynchronLink()
{
    if( _nEventId )
    {
        Application::RemoveUserEvent( _nEventId );
    }
}
 
void AsynchronLink::ClearPendingCall()
{
    std::scoped_lock aGuard(_aMutex);
    if( _nEventId )
    {
        Application::RemoveUserEvent( _nEventId );
        _nEventId = nullptr;
    }
}
 
IMPL_LINK_NOARG( AsynchronLink, HandleCall_PostUserEvent, void*, void )
{
    {
        std::scoped_lock aGuard(_aMutex);
        _nEventId = nullptr;
        // need to release the lock before calling the client since
        // the client may call back into us
    }
    _aLink.Call( _pArg );
}
 
}
 
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