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Diffstat (limited to 'cppu/source/threadpool/jobqueue.cxx')
-rw-r--r-- | cppu/source/threadpool/jobqueue.cxx | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/cppu/source/threadpool/jobqueue.cxx b/cppu/source/threadpool/jobqueue.cxx new file mode 100644 index 000000000..1be424024 --- /dev/null +++ b/cppu/source/threadpool/jobqueue.cxx @@ -0,0 +1,177 @@ +/* -*- 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 . + */ + +#include <sal/config.h> + +#include <cassert> + +#include "jobqueue.hxx" +#include "threadpool.hxx" + +namespace cppu_threadpool { + + JobQueue::JobQueue() : + m_nToDo( 0 ), + m_bSuspended( false ), + m_DisposedCallerAdmin( DisposedCallerAdmin::getInstance() ) + { + } + + void JobQueue::add( void *pThreadSpecificData, RequestFun * doRequest ) + { + std::scoped_lock guard( m_mutex ); + Job job = { pThreadSpecificData , doRequest }; + m_lstJob.push_back( job ); + if( ! m_bSuspended ) + { + m_cndWait.notify_all(); + } + m_nToDo ++; + } + + void *JobQueue::enter( void const * nDisposeId , bool bReturnWhenNoJob ) + { + void *pReturn = nullptr; + { + // synchronize with the dispose calls + std::scoped_lock guard( m_mutex ); + if( m_DisposedCallerAdmin->isDisposed( nDisposeId ) ) + { + return nullptr; + } + m_lstCallstack.push_front( nDisposeId ); + } + + + while( true ) + { + struct Job job={nullptr,nullptr}; + { + std::unique_lock guard( m_mutex ); + + while (m_bSuspended + || (m_lstCallstack.front() != nullptr && !bReturnWhenNoJob + && m_lstJob.empty())) + { + m_cndWait.wait(guard); + } + + if( nullptr == m_lstCallstack.front() ) + { + // disposed ! + if (!m_lstJob.empty() && m_lstJob.front().doRequest == nullptr) { + // If this thread was waiting for a remote response, that response may or + // may not have been enqueued; if it has not been enqueued, there cannot be + // another enqueued response, so it is always correct to remove any enqueued + // response here: + m_lstJob.pop_front(); + } + break; + } + + if( m_lstJob.empty() ) + { + assert(bReturnWhenNoJob); + break; + } + + job = m_lstJob.front(); + m_lstJob.pop_front(); + } + + if( job.doRequest ) + { + job.doRequest( job.pThreadSpecificData ); + std::scoped_lock guard( m_mutex ); + m_nToDo --; + } + else + { + pReturn = job.pThreadSpecificData; + std::scoped_lock guard( m_mutex ); + m_nToDo --; + break; + } + } + + { + // synchronize with the dispose calls + std::scoped_lock guard( m_mutex ); + m_lstCallstack.pop_front(); + } + + return pReturn; + } + + void JobQueue::dispose( void const * nDisposeId ) + { + std::scoped_lock guard( m_mutex ); + for( auto& rId : m_lstCallstack ) + { + if( rId == nDisposeId ) + { + rId = nullptr; + } + } + + if( !m_lstCallstack.empty() && ! m_lstCallstack.front() ) + { + // The thread is waiting for a disposed pCallerId, let it go + m_cndWait.notify_all(); + } + } + + void JobQueue::suspend() + { + std::scoped_lock guard( m_mutex ); + m_bSuspended = true; + } + + void JobQueue::resume() + { + std::scoped_lock guard( m_mutex ); + m_bSuspended = false; + if( ! m_lstJob.empty() ) + { + m_cndWait.notify_all(); + } + } + + bool JobQueue::isEmpty() const + { + std::scoped_lock guard( m_mutex ); + return m_lstJob.empty(); + } + + bool JobQueue::isCallstackEmpty() const + { + std::scoped_lock guard( m_mutex ); + return m_lstCallstack.empty(); + } + + bool JobQueue::isBusy() const + { + std::scoped_lock guard( m_mutex ); + return m_nToDo > 0; + } + + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |