C++ AsyncQueue类代码示例

int VlcProc::onEqBandsChange( vlc_object_t *pObj, const char *pVariable,
                              vlc_value_t oldVal, vlc_value_t newVal,
                              void *pParam )
{
    VlcProc *pThis = (VlcProc*)pParam;

    // Post a set equalizer bands command
    CmdSetEqBands *pCmd = new CmdSetEqBands( pThis->getIntf(),
                                             pThis->m_varEqBands,
                                             newVal.psz_string );
    AsyncQueue *pQueue = AsyncQueue::instance( pThis->getIntf() );
    pQueue->push( CmdGenericPtr( pCmd ) );

    return VLC_SUCCESS;
}

int VlcProc::onEqPreampChange( vlc_object_t *pObj, const char *pVariable,
                               vlc_value_t oldVal, vlc_value_t newVal,
                               void *pParam )
{
    VlcProc *pThis = (VlcProc*)pParam;
    EqualizerPreamp *pVarPreamp = (EqualizerPreamp*)(pThis->m_cVarEqPreamp.get());

    // Post a set preamp command
    CmdSetEqPreamp *pCmd = new CmdSetEqPreamp( pThis->getIntf(), *pVarPreamp,
                                              (newVal.f_float + 20.0) / 40.0 );
    AsyncQueue *pQueue = AsyncQueue::instance( pThis->getIntf() );
    pQueue->push( CmdGenericPtr( pCmd ) );

    return VLC_SUCCESS;
}

void Dialogs::showPlaylistSaveCB( intf_dialog_args_t *pArg )
{
    intf_thread_t *pIntf = (intf_thread_t *)pArg->p_arg;

    if( pArg->i_results && pArg->psz_results[0] )
    {
        // Create a Playlist Save command
        CmdPlaylistSave *pCmd =
            new CmdPlaylistSave( pIntf, pArg->psz_results[0] );

        // Push the command in the asynchronous command queue
        AsyncQueue *pQueue = AsyncQueue::instance( pIntf );
        pQueue->push( CmdGenericPtr( pCmd ) );
    }
}

int VlcProc::onItemDelete( vlc_object_t *pObj, const char *pVariable,
                           vlc_value_t oldVal, vlc_value_t newVal,
                           void *pParam )
{
    VlcProc *pThis = (VlcProc*)pParam;

    int i_id = newVal.i_int;
    CmdPlaytreeDelete *pCmdTree =
        new CmdPlaytreeDelete( pThis->getIntf(), i_id);

    // Push the command in the asynchronous command queue
    AsyncQueue *pQueue = AsyncQueue::instance( pThis->getIntf() );
    pQueue->push( CmdGenericPtr( pCmdTree ), false );

    return VLC_SUCCESS;
}

int VlcProc::onItemAppend( vlc_object_t *pObj, const char *pVariable,
                           vlc_value_t oldVal, vlc_value_t newVal,
                           void *pParam )
{
    VlcProc *pThis = (VlcProc*)pParam;

    playlist_add_t *p_add = static_cast<playlist_add_t*>(newVal.p_address);
    CmdPlaytreeAppend *pCmdTree =
        new CmdPlaytreeAppend( pThis->getIntf(), p_add );

    // Push the command in the asynchronous command queue
    AsyncQueue *pQueue = AsyncQueue::instance( pThis->getIntf() );
    pQueue->push( CmdGenericPtr( pCmdTree ), false );

    return VLC_SUCCESS;
}

int VoutManager::controlWindow( struct vout_window_t *pWnd,
                            int query, va_list args )
{
    intf_thread_t *pIntf = (intf_thread_t *)pWnd->p_private;
    VoutManager *pThis = pIntf->p_sys->p_voutManager;
    vout_thread_t* pVout = pWnd->vout;

    switch( query )
    {
        case VOUT_SET_SIZE:
        {
            unsigned int i_width  = va_arg( args, unsigned int );
            unsigned int i_height = va_arg( args, unsigned int );

            if( i_width && i_height )
            {
                pThis->lockVout();

                vector<SavedVout>::iterator it;
                for( it = pThis->m_SavedVoutVec.begin();
                     it != pThis->m_SavedVoutVec.end(); it++ )
                {
                    if( (*it).pVout == pVout )
                    {
                        // Post a vout resize command
                        CmdResizeVout *pCmd =
                            new CmdResizeVout( pThis->getIntf(),
                                               (*it).pVoutWindow,
                                               (int)i_width, (int)i_height );
                        AsyncQueue *pQueue =
                            AsyncQueue::instance( pThis->getIntf() );
                        pQueue->push( CmdGenericPtr( pCmd ) );
                        break;
                    }
                }

                pThis->unlockVout();
            }
        }

        default:
            msg_Dbg( pWnd, "control query not supported" );
            break;
    }

    return VLC_SUCCESS;
}

int VlcProc::onItemChange( vlc_object_t *pObj, const char *pVariable,
                           vlc_value_t oldval, vlc_value_t newval,
                           void *pParam )
{
    VlcProc *pThis = (VlcProc*)pParam;
    input_item_t *p_item = static_cast<input_item_t*>(newval.p_address);

    // Create a playtree notify command
    CmdPlaytreeUpdate *pCmdTree = new CmdPlaytreeUpdate( pThis->getIntf(),
                                                         p_item );

    // Push the command in the asynchronous command queue
    AsyncQueue *pQueue = AsyncQueue::instance( pThis->getIntf() );
    pQueue->push( CmdGenericPtr( pCmdTree ), true );

    return VLC_SUCCESS;
}

void VlcProc::on_intf_show_changed( vlc_object_t* p_obj, vlc_value_t newVal )
{
    (void)p_obj; (void)newVal;
    bool b_fullscreen = getFullscreenVar().get();

    if( !b_fullscreen )
    {
        if( newVal.b_bool )
        {
            // Create a raise all command
            CmdRaiseAll *pCmd = new CmdRaiseAll( getIntf(),
                getIntf()->p_sys->p_theme->getWindowManager() );

            // Push the command in the asynchronous command queue
            AsyncQueue *pQueue = AsyncQueue::instance( getIntf() );
            pQueue->push( CmdGenericPtr( pCmd ) );
        }
    }
    else
    {
        VoutManager* pVoutManager =  VoutManager::instance( getIntf() );
        FscWindow *pWin = pVoutManager->getFscWindow();
        if( pWin )
        {
            bool b_visible = pWin->getVisibleVar().get();
            AsyncQueue *pQueue = AsyncQueue::instance( getIntf() );

            if( !b_visible )
            {
               CmdShowWindow* pCmd = new CmdShowWindow( getIntf(),
                             getIntf()->p_sys->p_theme->getWindowManager(),
                             *pWin );
               pQueue->push( CmdGenericPtr( pCmd ) );
            }
            else
            {
               CmdHideWindow* pCmd = new CmdHideWindow( getIntf(),
                              getIntf()->p_sys->p_theme->getWindowManager(),
                              *pWin );
               pQueue->push( CmdGenericPtr( pCmd ) );
            }
        }
    }
}

void CmdUpdateItem::execute()
{
    playlist_t *pPlaylist = getIntf()->p_sys->p_playlist;
    if( pPlaylist == NULL )
        return;

    input_thread_t *p_input = playlist_CurrentInput( pPlaylist );
    if( !p_input )
        return;

    // Get playlist item information
    input_item_t *pItem = input_GetItem( p_input );

    char *pszName = input_item_GetName( pItem );
    char *pszUri = input_item_GetURI( pItem );

    string name = pszName;
    // XXX: This should be done in VLC core, not here...
    // Remove path information if any
    OSFactory *pFactory = OSFactory::instance( getIntf() );
    string::size_type pos = name.rfind( pFactory->getDirSeparator() );
    if( pos != string::npos )
    {
        name = name.substr( pos + 1, name.size() - pos + 1 );
    }
    UString srcName( getIntf(), name.c_str() );
    UString srcURI( getIntf(), pszUri );

    free( pszName );
    free( pszUri );

    // Create commands to update the stream variables
    CmdSetText *pCmd1 = new CmdSetText( getIntf(), m_rStreamName, srcName );
    CmdSetText *pCmd2 = new CmdSetText( getIntf(), m_rStreamURI, srcURI );
    // Push the commands in the asynchronous command queue
    AsyncQueue *pQueue = AsyncQueue::instance( getIntf() );
    pQueue->push( CmdGenericPtr( pCmd1 ), false );
    pQueue->push( CmdGenericPtr( pCmd2 ), false );
    vlc_object_release( p_input );
}

TEST(AsyncQueue, TestEmptyQueueBlocksConsumeOneUntilPushed)
{
    AsyncQueue<int> q;

    // run a separate thread to count how many items are consumed from the queue.	
    std::atomic<int> calls = 0;	
    std::thread t1([&] ()
    {	
        q.consumeOne([&calls] (int i)
        { 
            calls++; 
        });
    });	
    std::this_thread::sleep_for(std::chrono::milliseconds(250));
    ASSERT_EQ(0, calls);	

    // push something onto the queue and wait for consumer t1 to complete.
    q.push(1);
    t1.join();
    ASSERT_EQ(1, calls);
    ASSERT_EQ(0, q.size());
}

int ThemeRepository::changeSkin( vlc_object_t *pIntf, char const *pVariable,
                                 vlc_value_t oldval, vlc_value_t newval,
                                 void *pData )
{
    ThemeRepository *pThis = (ThemeRepository*)(pData);

    if( !strcmp( pVariable, "intf-skins-interactive" ) )
    {
        CmdDlgChangeSkin cmd( pThis->getIntf() );
        cmd.execute();
    }
    else if( !strcmp( pVariable, "intf-skins" ) )
    {
        // Try to load the new skin
        CmdChangeSkin *pCmd = new CmdChangeSkin( pThis->getIntf(),
                                                 newval.psz_string );
        AsyncQueue *pQueue = AsyncQueue::instance( pThis->getIntf() );
        pQueue->push( CmdGenericPtr( pCmd ) );
    }

    return VLC_SUCCESS;
}

//---------------------------------------------------------------------------
// Run: main loop
//---------------------------------------------------------------------------
static void *Run( void * p_obj )
{
    int canc = vlc_savecancel();

    intf_thread_t *p_intf = (intf_thread_t *)p_obj;

    bool b_error = false;
    char *skin_last = NULL;
    ThemeLoader *pLoader = NULL;
    OSLoop *loop = NULL;

    vlc_mutex_lock( &p_intf->p_sys->init_lock );

    // Initialize singletons
    if( OSFactory::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot initialize OSFactory" );
        b_error = true;
        goto end;
    }
    if( AsyncQueue::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot initialize AsyncQueue" );
        b_error = true;
        goto end;
    }
    if( Interpreter::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instantiate Interpreter" );
        b_error = true;
        goto end;
    }
    if( VarManager::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instantiate VarManager" );
        b_error = true;
        goto end;
    }
    if( VlcProc::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot initialize VLCProc" );
        b_error = true;
        goto end;
    }
    if( VoutManager::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instantiate VoutManager" );
        b_error = true;
        goto end;
    }
    if( ArtManager::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instantiate ArtManager" );
        b_error = true;
        goto end;
    }
    if( ThemeRepository::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instantiate ThemeRepository" );
        b_error = true;
        goto end;
    }
    if( Dialogs::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instantiate qt4 dialogs provider" );
        b_error = true;
        goto end;
    }

    // Load a theme
    skin_last = config_GetPsz( p_intf, "skins2-last" );
    pLoader = new ThemeLoader( p_intf );

    if( !skin_last || !pLoader->load( skin_last ) )
    {
        // No skins (not even the default one). let's quit
        CmdQuit *pCmd = new CmdQuit( p_intf );
        AsyncQueue *pQueue = AsyncQueue::instance( p_intf );
        pQueue->push( CmdGenericPtr( pCmd ) );
        msg_Err( p_intf, "no skins found : exiting");
    }

    delete pLoader;
    free( skin_last );

    // Get the instance of OSLoop
    loop = OSFactory::instance( p_intf )->getOSLoop();

    // Signal the main thread this thread is now ready
    p_intf->p_sys->b_error = false;
    p_intf->p_sys->b_ready = true;
    vlc_cond_signal( &p_intf->p_sys->init_wait );
    vlc_mutex_unlock( &p_intf->p_sys->init_lock );

    // Enter the main event loop
    loop->run();

//.........这里部分代码省略.........

//---------------------------------------------------------------------------
// Run: main loop
//---------------------------------------------------------------------------
static void *Run( void * p_obj )
{
    int canc = vlc_savecancel();

    intf_thread_t *p_intf = (intf_thread_t *)p_obj;

    bool b_error = false;
    char *skin_last = NULL;
    ThemeLoader *pLoader = NULL;
    OSLoop *loop = NULL;

    vlc_mutex_lock( &p_intf->p_sys->init_lock );

    // Initialize singletons
    if( OSFactory::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot initialize OSFactory" );
        b_error = true;
        goto end;
    }
    if( AsyncQueue::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot initialize AsyncQueue" );
        b_error = true;
        goto end;
    }
    if( Interpreter::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instanciate Interpreter" );
        b_error = true;
        goto end;
    }
    if( VarManager::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instanciate VarManager" );
        b_error = true;
        goto end;
    }
    if( VlcProc::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot initialize VLCProc" );
        b_error = true;
        goto end;
    }
    if( VoutManager::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instanciate VoutManager" );
        b_error = true;
        goto end;
    }
    if( ThemeRepository::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instanciate ThemeRepository" );
        b_error = true;
        goto end;
    }
    if( Dialogs::instance( p_intf ) == NULL )
    {
        msg_Err( p_intf, "cannot instanciate qt4 dialogs provider" );
        b_error = true;
        goto end;
    }

    // Load a theme
    skin_last = config_GetPsz( p_intf, "skins2-last" );
    pLoader = new ThemeLoader( p_intf );

    if( !skin_last || !*skin_last || !pLoader->load( skin_last ) )
    {
        // Get the resource path and try to load the default skin
        OSFactory *pOSFactory = OSFactory::instance( p_intf );
        const list<string> &resPath = pOSFactory->getResourcePath();
        const string &sep = pOSFactory->getDirSeparator();

        list<string>::const_iterator it;
        for( it = resPath.begin(); it != resPath.end(); it++ )
        {
            string path = (*it) + sep + "default.vlt";
            if( pLoader->load( path ) )
            {
                // Theme loaded successfully
                break;
            }
        }
        if( it == resPath.end() )
        {
            // Last chance: the user can select a new theme file
            if( Dialogs::instance( p_intf ) )
            {
                CmdDlgChangeSkin *pCmd = new CmdDlgChangeSkin( p_intf );
                AsyncQueue *pQueue = AsyncQueue::instance( p_intf );
                pQueue->push( CmdGenericPtr( pCmd ) );
            }
            else
            {
                // No dialogs provider, just quit...
                CmdQuit *pCmd = new CmdQuit( p_intf );
//.........这里部分代码省略.........

//---------------------------------------------------------------------------
// Run: main loop
//---------------------------------------------------------------------------
static void Run( intf_thread_t *p_intf )
{
    // Load a theme
    ThemeLoader *pLoader = new ThemeLoader( p_intf );
    char *skin_last = config_GetPsz( p_intf, "skins2-last" );

    if( !skin_last || !*skin_last || !pLoader->load( skin_last ) )
    {
        // Get the resource path and try to load the default skin
        OSFactory *pOSFactory = OSFactory::instance( p_intf );
        const list<string> &resPath = pOSFactory->getResourcePath();
        const string &sep = pOSFactory->getDirSeparator();

        list<string>::const_iterator it;
        for( it = resPath.begin(); it != resPath.end(); it++ )
        {
            string path = (*it) + sep + "default.vlt";
            if( pLoader->load( path ) )
            {
                // Theme loaded successfully
                break;
            }
        }
        if( it == resPath.end() )
        {
            // Last chance: the user can select a new theme file
            if( Dialogs::instance( p_intf ) )
            {
                CmdDlgChangeSkin *pCmd = new CmdDlgChangeSkin( p_intf );
                AsyncQueue *pQueue = AsyncQueue::instance( p_intf );
                pQueue->push( CmdGenericPtr( pCmd ) );
            }
            else
            {
                // No dialogs provider, just quit...
                CmdQuit *pCmd = new CmdQuit( p_intf );
                AsyncQueue *pQueue = AsyncQueue::instance( p_intf );
                pQueue->push( CmdGenericPtr( pCmd ) );
                msg_Err( p_intf,
                         "Cannot show the \"open skin\" dialog: exiting...");
            }
        }
    }
    delete pLoader;

    if( skin_last )
    {
        free( skin_last );
    }

    // Get the instance of OSLoop
    OSLoop *loop = OSFactory::instance( p_intf )->getOSLoop();

    // Check if we need to start playing
    if( p_intf->b_play )
    {
        playlist_t *p_playlist =
            (playlist_t *)vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
                                           FIND_ANYWHERE );
        if( p_playlist )
        {
            playlist_Play( p_playlist );
            vlc_object_release( p_playlist );
        }
    }

    // Enter the main event loop
    loop->run();

    // Delete the theme and save the configuration of the windows
    if( p_intf->p_sys->p_theme )
    {
        p_intf->p_sys->p_theme->saveConfig();
        delete p_intf->p_sys->p_theme;
        p_intf->p_sys->p_theme = NULL;
    }
}