QWriteLocker¶
The
QWriteLocker
class is a convenience class that simplifies locking and unlocking read-write locks for write access. More…
Synopsis¶
Functions¶
def
__enter__
()def
__exit__
(arg__1, arg__2, arg__3)def
readWriteLock
()def
relock
()def
unlock
()
Detailed Description¶
The purpose of
QWriteLocker
(andQReadLocker
) is to simplifyQReadWriteLock
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): locker.lockForWrite() # ... locker.unlock()The
QMutexLocker
documentation shows examples where the use of a locker object greatly simplifies programming.See also
- class PySide2.QtCore.QWriteLocker(readWriteLock)¶
- param readWriteLock:
Constructs a
QWriteLocker
and lockslock
for writing. The lock will be unlocked when theQWriteLocker
is destroyed. Iflock
is zero,QWriteLocker
does nothing.See also
- PySide2.QtCore.QWriteLocker.__enter__()¶
- PySide2.QtCore.QWriteLocker.__exit__(arg__1, arg__2, arg__3)¶
- Parameters:
arg__1 – object
arg__2 – object
arg__3 – object
- PySide2.QtCore.QWriteLocker.readWriteLock()¶
- Return type:
Returns a pointer to the read-write lock that was passed to the constructor.
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