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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006 Chris Cannam.
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. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_FILE_READ_THREAD_H
#define SV_FILE_READ_THREAD_H
#include "base/Thread.h"
#include <QMutex>
#include <QWaitCondition>
#include <map>
#include <set>
#include <stdint.h>
namespace sv {
class FileReadThread : public Thread
{
Q_OBJECT
public:
FileReadThread();
void run() override;
virtual void finish();
struct Request {
int fd;
QMutex *mutex; // used to synchronise access to fd; may be null
off_t start;
size_t size;
char *data; // caller is responsible for allocating and deallocating
bool successful; // set by FileReadThread after processing request
};
virtual int request(const Request &request);
virtual void cancel(int token);
virtual bool isReady(int token);
virtual bool isCancelled(int token); // and safe to delete
virtual bool haveRequest(int token);
virtual bool getRequest(int token, Request &request);
virtual void done(int token);
protected:
int m_nextToken;
bool m_exiting;
typedef std::map<int, Request> RequestQueue;
RequestQueue m_queue;
RequestQueue m_cancelledRequests;
RequestQueue m_readyRequests;
std::set<int> m_newlyCancelled;
QMutex m_mutex;
QWaitCondition m_condition;
void process();
void notifyCancelled();
};
} // end namespace sv
#endif
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