QWriteLocker Class ReferenceThe QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access. Далее... #include <QWriteLocker> Замечание: Все функции в этом классе потокобезопасны. Открытые функции
Подробное описаниеThe 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); ... } It is equivalent to the following code: QReadWriteLock lock; void writeData(const QByteArray &data) { lock.lockForWrite(); ... lock.unlock(); } The QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming. See also QReadLocker and QReadWriteLock. Описание функций-членовQWriteLocker::QWriteLocker ( QReadWriteLock * lock )Constructs a QWriteLocker and locks lock for writing. The lock will be unlocked when the QWriteLocker is destroyed. If lock is zero, QWriteLocker does nothing. See also QReadWriteLock::lockForWrite(). QWriteLocker::~QWriteLocker ()Destroys the QWriteLocker and unlocks the lock that was passed to the constructor. See also QReadWriteLock::unlock(). QReadWriteLock * QWriteLocker::readWriteLock () constReturns a pointer to the read-write lock that was passed to the constructor. void QWriteLocker::relock ()Relocks an unlocked lock. See also unlock(). void QWriteLocker::unlock ()Unlocks the lock associated with this locker. See also QReadWriteLock::unlock(). |
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