The PySide.QtCore.QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access.
The purpose of PySide.QtCore.QWriteLocker (and PySide.QtCore.QReadLocker is to simplify PySide.QtCore.QReadWriteLock locking and unlocking. Locking and unlocking statements or in exception handling code is error-prone and difficult to debug. PySide.QtCore.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 PySide.QtCore.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): locker.lockForWrite() # ... locker.unlock()
The PySide.QtCore.QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming.
|Parameters:||readWriteLock – PySide.QtCore.QReadWriteLock|
Constructs a PySide.QtCore.QWriteLocker and locks lock for writing. The lock will be unlocked when the PySide.QtCore.QWriteLocker is destroyed. If lock is zero, PySide.QtCore.QWriteLocker does nothing.
Returns a pointer to the read-write lock that was passed to the constructor.
Relocks an unlocked lock.