QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access. More…
__exit__(arg__1, arg__2, arg__3)
The purpose of
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
QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming.
- class PySide6.QtCore.QReadLocker(readWriteLock)#
QReadLocker and locks
lock for reading. The lock will be unlocked when the
QReadLocker is destroyed. If
lock is zero,
QReadLocker does nothing.
- Return type
- PySide6.QtCore.QReadLocker.__exit__(arg__1, arg__2, arg__3)#
arg__1 – object
arg__2 – object
arg__3 – object
- Return type
Returns a pointer to the read-write lock that was passed to the constructor.
Relocks an unlocked lock.
Unlocks the lock associated with this locker.