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/*******************************************************************************
* taskqueue.h
*
* ---------------------------------------------------------------------------
* Persistence of Vision Ray Tracer ('POV-Ray') version 3.7.
* Copyright 1991-2013 Persistence of Vision Raytracer Pty. Ltd.
*
* POV-Ray is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* POV-Ray 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ---------------------------------------------------------------------------
* POV-Ray is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
* ---------------------------------------------------------------------------
* $File: //depot/public/povray/3.x/source/backend/support/taskqueue.h $
* $Revision: #1 $
* $Change: 6069 $
* $DateTime: 2013/11/06 11:59:40 $
* $Author: chrisc $
*******************************************************************************/
#ifndef POVRAY_BACKEND_TASKQUEUE_H
#define POVRAY_BACKEND_TASKQUEUE_H
#include <boost/thread.hpp>
#include <boost/thread/condition.hpp>
#include "base/povmscpp.h"
#include "backend/support/task.h"
namespace pov
{
using boost::recursive_mutex;
class TaskQueue
{
class TaskEntry
{
public:
enum EntryType
{
kTask,
kSync,
kMessage,
kFunction,
};
TaskEntry(EntryType et) : entryType(et) { }
TaskEntry(shared_ptr<Task> rt) : entryType(kTask), task(rt) { }
TaskEntry(POVMS_Message& m) : entryType(kMessage), msg(m) { }
TaskEntry(const boost::function1<void, TaskQueue&>& f) : entryType(kFunction), fn(f) { }
~TaskEntry() { }
shared_ptr<Task> GetTask() { return task; }
POVMS_Message& GetMessage() { return msg; }
boost::function1<void, TaskQueue&>& GetFunction() { return fn; }
EntryType GetEntryType() { return entryType; }
private:
EntryType entryType;
shared_ptr<Task> task;
POVMS_Message msg;
boost::function1<void, TaskQueue&> fn;
};
public:
TaskQueue();
~TaskQueue();
void Stop();
void Pause();
void Resume();
bool IsPaused();
bool IsRunning();
bool IsDone();
bool Failed();
int FailureCode(int defval = kNoError);
Task::TaskData *AppendTask(Task *task);
void AppendSync();
void AppendMessage(POVMS_Message& msg);
void AppendFunction(const boost::function1<void, TaskQueue&>& fn);
bool Process();
void Notify();
private:
/// queued task list
std::queue<TaskEntry> queuedTasks;
/// active task list
list<TaskEntry> activeTasks;
/// queue mutex
boost::recursive_mutex queueMutex;
/// failed code
int failed;
/// wait for data in queue or related operation to be processed
boost::condition processCondition;
/// not available
TaskQueue(const TaskQueue&);
/// not available
TaskQueue& operator=(const TaskQueue&);
};
}
#endif // POVRAY_BACKEND_TASKQUEUE_H
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