File indexing completed on 2024-05-12 15:57:03

 /*
  *  SPDX-FileCopyrightText: 2017 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef KISUPGRADETOWRITELOCKER_H
 #define KISUPGRADETOWRITELOCKER_H
 
 #include <QReadLocker>
 #include <QReadWriteLock>
 
 /**
  * @brief The KisUpgradeToWriteLocker class is use for RAII style unlocking
  * the read lock and then locking the lock for write. We basically "upgrade"
  * the lock to a write one.
  *
  * WARNING: during the *upgrade* the lock passes the "unlocked" state, so
  *          all the protected data you acquired during the "read" phase might
  *          have become invalidated!
  */
 class KisUpgradeToWriteLocker
 {
 public:
     KisUpgradeToWriteLocker(QReadLocker *locker)
         : m_locker(locker)
     {
         m_locker->unlock();
         m_locker->readWriteLock()->lockForWrite();
     }
 
     ~KisUpgradeToWriteLocker() {
         m_locker->readWriteLock()->unlock();
         m_locker->relock();
     }
 
 private:
     QReadLocker *m_locker;
 };
 
 
 
 #endif // KISUPGRADETOWRITELOCKER_H