QReadLocker 类

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

头：	#include <QReadLocker>
qmake:	QT += core

所有成员列表，包括继承成员

注意： 此类的所有函数 thread-safe .

公共函数

	QReadLocker (QReadWriteLock * lock )
	~QReadLocker ()
QReadWriteLock *	readWriteLock () const
void	relock ()
void	unlock ()

详细描述

The purpose of QReadLocker (and QWriteLocker ) 是简化 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's an example that uses QReadLocker to lock and unlock a read-write lock for reading:

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

它相当于以下代码：

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

QMutexLocker 文档编制展示使用锁定器对象大大简化编程的范例。

另请参阅 QWriteLocker and QReadWriteLock .

成员函数文档编制

QReadLocker:: QReadLocker ( QReadWriteLock * lock )

Constructs a QReadLocker and locks lock for reading. The lock will be unlocked when the QReadLocker is destroyed. If lock is zero, QReadLocker does nothing.

另请参阅 QReadWriteLock::lockForRead ().

QReadLocker:: ~QReadLocker ()

销毁 QReadLocker 并解锁被传递给构造函数的锁。

另请参阅 QReadWriteLock::unlock ().

QReadWriteLock *QReadLocker:: readWriteLock () const

返回指向被传递给构造函数的读写锁的指针。

void QReadLocker:: relock ()

重新锁定被解锁的锁。

另请参阅 unlock ().

void QReadLocker:: unlock ()

解锁关联此锁定器的锁。

另请参阅 QReadWriteLock::unlock ().