QReadLocker#

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

Synopsis#

Functions#

def __enter__ ()
def __exit__ (arg__1, arg__2, arg__3)
def readWriteLock ()
def relock ()
def unlock ()

Detailed Description#

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:

lock = QReadWriteLock()
readData = QByteArray()

    locker = QReadLocker(lock)
    ...
    return data

It is equivalent to the following code:

lock = QReadWriteLock()
readData = QByteArray()

    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

class PySide6.QtCore.QReadLocker(readWriteLock)#

Parameters: readWriteLock – PySide6.QtCore.QReadWriteLock

Constructs a QReadLocker and locks lock for reading. The lock will be unlocked when the QReadLocker is destroyed. If lock is zero, QReadLocker does nothing.

See also

lockForRead()

PySide6.QtCore.QReadLocker.__enter__()#

Return type: PySide6.QtCore.QReadLocker

PySide6.QtCore.QReadLocker.__exit__(arg__1, arg__2, arg__3)#

Parameters

arg__1 – object
arg__2 – object
arg__3 – object

PySide6.QtCore.QReadLocker.readWriteLock()#

Return type: PySide6.QtCore.QReadWriteLock

Returns a pointer to the read-write lock that was passed to the constructor.

PySide6.QtCore.QReadLocker.relock()#

Relocks an unlocked lock.

See also

unlock()

PySide6.QtCore.QReadLocker.unlock()#

Unlocks the lock associated with this locker.

See also

unlock()