PySide.QtCore.QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access.
The purpose of PySide.QtCore.QReadLocker (and PySide.QtCore.QWriteLocker ) 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.QReadLocker 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.QReadLocker to lock and unlock a read-write lock for reading:
lock = QReadWriteLock()
def readData():
locker = QReadLocker(lock)
# ...
return data
它相当于以下代码：
lock = QReadWriteLock()
def readData():
locker.lockForRead()
# ...
locker.unlock()
return data
PySide.QtCore.QMutexLocker 文档编制展示使用锁定器对象大大简化编程的范例。
| 参数： | readWriteLock – PySide.QtCore.QReadWriteLock |
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构造 PySide.QtCore.QReadLocker and locks lock for reading. The lock will be unlocked when the PySide.QtCore.QReadLocker is destroyed. If lock is zero, PySide.QtCore.QReadLocker does nothing.
| 参数： |
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| 返回类型： | PySide.QtCore.QReadWriteLock |
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返回指向被传递给构造函数的读写锁的指针。
重新锁定被解锁的锁。
解锁关联此锁定器的锁。