QGIS API Documentation 3.27.0-Master (f261cc1f8b)
qgsreadwritelocker.cpp
Go to the documentation of this file.
1/***************************************************************************
2 qgsreadwritelocker.cpp
3 -------------------------
4 begin : September 2018
5 copyright : (C) 2018 by Matthias Kuhn
7 ***************************************************************************/
8
9/***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17
18#include "qgsreadwritelocker.h"
19
21 : mLock( lock )
22 , mMode( mode )
23{
24 if ( mode == Read )
25 mLock.lockForRead();
26 else if ( mode == Write )
27 mLock.lockForWrite();
28}
29
31{
32 if ( mode == mMode )
33 return;
34
35 unlock();
36
37 mMode = mode;
38
39 if ( mMode == Read )
40 mLock.lockForRead();
41 else if ( mMode == Write )
42 mLock.lockForWrite();
43}
44
46{
47 if ( mMode != Unlocked )
48 mLock.unlock();
49
50 mMode = Unlocked;
51}
52
54{
55 unlock();
56}
Mode
A QReadWriteLock can be in 3 different modes, read, write or unlocked.
@ Write
Lock for write.
@ Read
Lock for read.
void unlock()
Unlocks the lock.
void changeMode(Mode mode)
Change the mode of the lock to mode.
QgsReadWriteLocker(QReadWriteLock &lock, Mode mode)
Create a new QgsReadWriteLocker for lock and initialize in mode.