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 |
注意: 此类的所有函数 thread-safe .
QReadLocker (QReadWriteLock * lock ) | |
~QReadLocker () | |
QReadWriteLock * | readWriteLock () const |
void | relock () |
void | unlock () |
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; }
The 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 .
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 ().
销毁 QReadLocker 并解锁被传递给构造函数的锁。
另请参阅 QReadWriteLock::unlock ().
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。
另请参阅 unlock ().
解锁关联此锁定器的锁。
另请参阅 QReadWriteLock::unlock ().