QReadLocker Class Reference

\inmodule QtCore More...

Collaboration diagram for QReadLocker:

Detailed Description

\inmodule QtCore

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

\threadsafe

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

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

QReadWriteLock lock;
 
QByteArray readData()
{
    QReadLocker locker(&lock);
    ...
    return data;
}

It is equivalent to the following code:

QReadWriteLock lock;
 
QByteArray readData()
{
    lock.lockForRead();
    ...
    lock.unlock();
    return data;
}

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

See also

QWriteLocker, QReadWriteLock

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The documentation for this class was generated from the following file:

• qtbase/src/corelib/thread/qreadwritelock.cpp (b67ebbe3a0b161f4205f722a8c8a051808144439)