QReadLocker露

PyQt5.QtCore.QReadLocker

Description露

The QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access.

The purpose of QReadLocker (and QWriteLocker) is to simplify QReadWriteLock locking and unlocking. Locking and unlocking statements or in exception handling code is error-prone and difficult to debug. QReadLocker can be used in such situations to ensure that the state of the lock is always well-defined.

Here鈥檚 an example that uses QReadLocker to lock and unlock a read-write lock for reading:

# QReadWriteLock lock;

# QByteArray readData()
# {
#     QReadLocker locker(&lock);
#     ...
#     return data;
# }

It is equivalent to the following code:

# QReadWriteLock lock;

# QByteArray readData()
# {
#     lock.lockForRead();
#     ...
#     lock.unlock();
#     return data;
# }

The QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming.

Methods露

__init__(QReadWriteLock): TODO

__enter__() → object: TODO

__exit__(object, object, object): TODO

readWriteLock() → QReadWriteLock: TODO

relock(): TODO

unlock(): TODO