async_queue.cpp
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:4k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * async_queue.cpp
- *****************************************************************************
- * Copyright (C) 2003 the VideoLAN team
- * $Id: de19dc7b3710fbb4921a1a8bd0cefac36021e98b $
- *
- * Authors: Cyril Deguet <asmax@via.ecp.fr>
- * Olivier Teulière <ipkiss@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #include "async_queue.hpp"
- #include "../src/os_factory.hpp"
- #include "../src/os_timer.hpp"
- AsyncQueue::AsyncQueue( intf_thread_t *pIntf ): SkinObject( pIntf ),
- m_cmdFlush( this )
- {
- // Initialize the mutex
- vlc_mutex_init( &m_lock );
- // Create a timer
- OSFactory *pOsFactory = OSFactory::instance( pIntf );
- m_pTimer = pOsFactory->createOSTimer( m_cmdFlush );
- // Flush the queue every 10 ms
- m_pTimer->start( 10, false );
- }
- AsyncQueue::~AsyncQueue()
- {
- delete( m_pTimer );
- vlc_mutex_destroy( &m_lock );
- }
- AsyncQueue *AsyncQueue::instance( intf_thread_t *pIntf )
- {
- if( ! pIntf->p_sys->p_queue )
- {
- AsyncQueue *pQueue;
- pQueue = new AsyncQueue( pIntf );
- if( pQueue )
- {
- // Initialization succeeded
- pIntf->p_sys->p_queue = pQueue;
- }
- }
- return pIntf->p_sys->p_queue;
- }
- void AsyncQueue::destroy( intf_thread_t *pIntf )
- {
- if( pIntf->p_sys->p_queue )
- {
- delete pIntf->p_sys->p_queue;
- pIntf->p_sys->p_queue = NULL;
- }
- }
- void AsyncQueue::push( const CmdGenericPtr &rcCommand, bool removePrev )
- {
- if( removePrev )
- {
- // Remove the commands of the same type
- remove( rcCommand.get()->getType(), rcCommand );
- }
- m_cmdList.push_back( rcCommand );
- }
- void AsyncQueue::remove( const string &rType, const CmdGenericPtr &rcCommand )
- {
- vlc_mutex_lock( &m_lock );
- list<CmdGenericPtr>::iterator it;
- for( it = m_cmdList.begin(); it != m_cmdList.end(); it++ )
- {
- // Remove the command if it is of the given type
- if( (*it).get()->getType() == rType )
- {
- // Maybe the command wants to check if it must really be
- // removed
- if( rcCommand.get()->checkRemove( (*it).get() ) == true )
- {
- list<CmdGenericPtr>::iterator itNew = it;
- itNew++;
- m_cmdList.erase( it );
- it = itNew;
- }
- }
- }
- vlc_mutex_unlock( &m_lock );
- }
- void AsyncQueue::flush()
- {
- while (true)
- {
- vlc_mutex_lock( &m_lock );
- if( m_cmdList.size() > 0 )
- {
- // Pop the first command from the queue
- CmdGenericPtr cCommand = m_cmdList.front();
- m_cmdList.pop_front();
- // Unlock the mutex to avoid deadlocks if another thread wants to
- // enqueue/remove a command while this one is processed
- vlc_mutex_unlock( &m_lock );
- // Execute the command
- cCommand.get()->execute();
- }
- else
- {
- vlc_mutex_unlock( &m_lock );
- break;
- }
- }
- }
- void AsyncQueue::CmdFlush::execute()
- {
- // Flush the queue
- m_pParent->flush();
- }