The QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access. 更多...
The QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access.
The purpose of QWriteLocker (and QReadLocker is to simplify QReadWriteLock 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:
QReadWriteLock lock; void writeData(const QByteArray &data) { QWriteLocker locker(&lock); ... }
它相当于以下代码：
QReadWriteLock lock; void writeData(const QByteArray &data) { lock.lockForWrite(); ... lock.unlock(); }
QMutexLocker 文档编制 shows examples where the use of a locker object greatly simplifies programming.
构造 QWriteLocker and locks lock for writing. The lock will be unlocked when the QWriteLocker is destroyed. If lock is zero, QWriteLocker does nothing.
另请参阅 QReadWriteLock.lockForWrite ().
Returns a pointer to the read-write lock that was passed to the 构造函数。
重新锁定被解锁的锁。
另请参阅 unlock ().
解锁关联此锁定器的锁。
另请参阅 QReadWriteLock.unlock ().
