QGIS API Documentation  3.14.0-Pi (9f7028fd23)
qgsreadwritelocker.cpp
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1 /***************************************************************************
2  qgsreadwritelocker.cpp
3  -------------------------
4  begin : September 2018
5  copyright : (C) 2018 by Matthias Kuhn
6  email : [email protected]
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 }
QgsReadWriteLocker::changeMode
void changeMode(Mode mode)
Change the mode of the lock to mode.
Definition: qgsreadwritelocker.cpp:30
qgsreadwritelocker.h
QgsReadWriteLocker::Read
@ Read
Lock for read.
Definition: qgsreadwritelocker.h:75
QgsReadWriteLocker::QgsReadWriteLocker
QgsReadWriteLocker(QReadWriteLock &lock, Mode mode)
Create a new QgsReadWriteLocker for lock and initialize in mode.
Definition: qgsreadwritelocker.cpp:20
QgsReadWriteLocker::unlock
void unlock()
Unlocks the lock.
Definition: qgsreadwritelocker.cpp:45
QgsReadWriteLocker::Write
@ Write
Lock for write.
Definition: qgsreadwritelocker.h:76
QgsReadWriteLocker::Mode
Mode
A QReadWriteLock can be in 3 different modes, read, write or unlocked.
Definition: qgsreadwritelocker.h:60
QgsReadWriteLocker::~QgsReadWriteLocker
~QgsReadWriteLocker()
Definition: qgsreadwritelocker.cpp:53
QgsReadWriteLocker::Unlocked
@ Unlocked
Unlocked.
Definition: qgsreadwritelocker.h:77