annotate data/fileio/FileReadThread.h @ 1332:b1a7f4554400 svg

Implement "Export SVG file..."
author Chris Cannam
date Mon, 19 Dec 2016 16:32:34 +0000 (2016-12-19)
parents 3e0f1f7bec85
children c01cbe41aeb5
rev   line source
Chris@148 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@148 2
Chris@148 3 /*
Chris@148 4 Sonic Visualiser
Chris@148 5 An audio file viewer and annotation editor.
Chris@148 6 Centre for Digital Music, Queen Mary, University of London.
Chris@148 7 This file copyright 2006 Chris Cannam.
Chris@148 8
Chris@148 9 This program is free software; you can redistribute it and/or
Chris@148 10 modify it under the terms of the GNU General Public License as
Chris@148 11 published by the Free Software Foundation; either version 2 of the
Chris@148 12 License, or (at your option) any later version. See the file
Chris@148 13 COPYING included with this distribution for more information.
Chris@148 14 */
Chris@148 15
Chris@148 16 #ifndef _FILE_READ_THREAD_H_
Chris@148 17 #define _FILE_READ_THREAD_H_
Chris@148 18
Chris@150 19 #include "base/Thread.h"
Chris@148 20
Chris@148 21 #include <QMutex>
Chris@148 22 #include <QWaitCondition>
Chris@148 23
Chris@148 24 #include <map>
Chris@148 25 #include <set>
Chris@148 26
Chris@148 27 #include <stdint.h>
Chris@148 28
Chris@148 29 class FileReadThread : public Thread
Chris@148 30 {
Chris@148 31 Q_OBJECT
Chris@148 32
Chris@148 33 public:
Chris@148 34 FileReadThread();
Chris@148 35
Chris@148 36 virtual void run();
Chris@148 37 virtual void finish();
Chris@148 38
Chris@148 39 struct Request {
Chris@148 40 int fd;
Chris@148 41 QMutex *mutex; // used to synchronise access to fd; may be null
Chris@148 42 off_t start;
Chris@148 43 size_t size;
Chris@148 44 char *data; // caller is responsible for allocating and deallocating
Chris@148 45 bool successful; // set by FileReadThread after processing request
Chris@148 46 };
Chris@148 47
Chris@148 48 virtual int request(const Request &request);
Chris@148 49 virtual void cancel(int token);
Chris@148 50
Chris@148 51 virtual bool isReady(int token);
Chris@148 52 virtual bool isCancelled(int token); // and safe to delete
Chris@455 53 virtual bool haveRequest(int token);
Chris@148 54 virtual bool getRequest(int token, Request &request);
Chris@148 55 virtual void done(int token);
Chris@148 56
Chris@148 57 protected:
Chris@148 58 int m_nextToken;
Chris@148 59 bool m_exiting;
Chris@148 60
Chris@148 61 typedef std::map<int, Request> RequestQueue;
Chris@148 62 RequestQueue m_queue;
Chris@148 63 RequestQueue m_cancelledRequests;
Chris@148 64 RequestQueue m_readyRequests;
Chris@148 65 std::set<int> m_newlyCancelled;
Chris@148 66
Chris@148 67 QMutex m_mutex;
Chris@148 68 QWaitCondition m_condition;
Chris@148 69
Chris@148 70 void process();
Chris@148 71 void notifyCancelled();
Chris@148 72 };
Chris@148 73
Chris@148 74 #endif