QWriteLocker Class Reference

\inmodule QtCore More...

Collaboration diagram for QWriteLocker:

Detailed Description

\inmodule QtCore

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

\threadsafe

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.

See also

QReadLocker, QReadWriteLock

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

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