The purpose of
QReadLocker) is to simplify
QReadWriteLocklocking and unlocking. Locking and unlocking statements or in exception handling code is error-prone and difficult to debug.
QWriteLockercan be used in such situations to ensure that the state of the lock is always well-defined.
Here’s an example that uses
QWriteLockerto 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): locker.lockForWrite() # ... locker.unlock()
QMutexLockerdocumentation shows examples where the use of a locker object greatly simplifies programming.
- class PySide2.QtCore.QWriteLocker(readWriteLock)¶
- param readWriteLock:
- PySide2.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.
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