The purpose of
QWriteLocker) is to simplify
QReadWriteLocklocking and unlocking. Locking and unlocking statements or in exception handling code is error-prone and difficult to debug.
QReadLockercan be used in such situations to ensure that the state of the lock is always well-defined.
Here’s an example that uses
QReadLockerto lock and unlock a read-write lock for reading:lock = QReadWriteLock() def readData(): locker = QReadLocker(lock) # ... return data
It is equivalent to the following code:lock = QReadWriteLock() def readData(): locker.lockForRead() # ... locker.unlock() return data
QMutexLockerdocumentation shows examples where the use of a locker object greatly simplifies programming.
- param readWriteLock
__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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