The QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access. More...
Header: | #include <QReadLocker> |
qmake: | QT += core |
Note: All functions in this class are thread-safe.
QReadLocker(QReadWriteLock *lock) | |
~QReadLocker() | |
QReadWriteLock * | readWriteLock() const |
void | relock() |
void | unlock() |
The QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access.
The purpose of QReadLocker (and QWriteLocker) is to simplify 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; }
It is equivalent to the following code:
QReadWriteLock lock; QByteArray readData() { lock.lockForRead(); ... lock.unlock(); return data; }
The QMutexLocker documentation shows examples where the use of a locker object greatly simplifies programming.
See also 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.
See also QReadWriteLock::lockForRead().
Destroys the QReadLocker and unlocks the lock that was passed to the constructor.
See also QReadWriteLock::unlock().
Returns a pointer to the read-write lock that was passed to the constructor.
Relocks an unlocked lock.
See also unlock().
Unlocks the lock associated with this locker.
See also QReadWriteLock::unlock().
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