QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access. More…
__exit__(arg__1, arg__2, arg__3)
The purpose of
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:
lock = QReadWriteLock() def writeData(data): locker = QWriteLocker(lock) ...
It is equivalent to the following code:
lock = QReadWriteLock() def writeData(data): lock.lockForWrite() ... lock.unlock()
QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming.
- class PySide6.QtCore.QWriteLocker(readWriteLock)#
QWriteLocker and locks
lock for writing. The lock will be unlocked when the
QWriteLocker is destroyed. If
lock is zero,
QWriteLocker does nothing.
- Return type
- PySide6.QtCore.QWriteLocker.__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.