QReadLocker Class▲
-
Header: QReadLocker
-
CMake:
find_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core)
-
qmake: QT += core
-
Group: QReadLocker is part of thread
Detailed Description▲
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▲
See also QWriteLocker, QReadWriteLock
Member Function Documentation▲
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.
See Also▲
See also QReadWriteLock::lockForRead()
QReadLocker::~QReadLocker()▲
Destroys the QReadLocker and unlocks the lock that was passed to the constructor.
See Also▲
See also QReadWriteLock::unlock()
QReadWriteLock *QReadLocker::readWriteLock() const▲
Returns a pointer to the read-write lock that was passed to the constructor.