Detailed Description

The QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access.

The purpose of QWriteLocker (and QReadLocker is to simplify QReadWriteLock locking and unlocking. Locking and unlocking statements or in exception handling code is error-prone and difficult to debug. QWriteLocker can be used in such situations to ensure that the state of the lock is always well-defined.

Here's an example that uses QWriteLocker to lock and unlock a read-write lock for writing:

QReadWriteLock lock;

void writeData(const QByteArray &data)
{
    QWriteLocker locker(&lock);
    ...
}

It is equivalent to the following code:

QReadWriteLock lock;

void writeData(const QByteArray &data)
{
    lock.lockForWrite();
    ...
    lock.unlock();
}

The QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming.