QRunnable Class
The QRunnable class is the base class for all runnable objects. More...
| Header: | #include <QRunnable> |
| qmake: | QT += core |
| Since: | Qt 4.4 |
This class was introduced in Qt 4.4.
Public Functions
| QRunnable() | |
| virtual | ~QRunnable() |
| bool | autoDelete() const |
| virtual void | run() = 0 |
| void | setAutoDelete(bool autoDelete) |
Static Public Members
| QRunnable * | create(std::function<void ()> functionToRun) |
Detailed Description
The QRunnable class is an interface for representing a task or piece of code that needs to be executed, represented by your reimplementation of the run() function.
You can use QThreadPool to execute your code in a separate thread. QThreadPool deletes the QRunnable automatically if autoDelete() returns true (the default). Use setAutoDelete() to change the auto-deletion flag.
QThreadPool supports executing the same QRunnable more than once by calling QThreadPool::tryStart(this) from within the run() function. If autoDelete is enabled the QRunnable will be deleted when the last thread exits the run function. Calling QThreadPool::start() multiple times with the same QRunnable when autoDelete is enabled creates a race condition and is not recommended.
See also QThreadPool.
Member Function Documentation
QRunnable::QRunnable()
Constructs a QRunnable. Auto-deletion is enabled by default.
See also autoDelete() and setAutoDelete().
[virtual] QRunnable::~QRunnable()
QRunnable virtual destructor.
bool QRunnable::autoDelete() const
Returns true is auto-deletion is enabled; false otherwise.
If auto-deletion is enabled, QThreadPool will automatically delete this runnable after calling run(); otherwise, ownership remains with the application programmer.
See also setAutoDelete() and QThreadPool.
[static] QRunnable *QRunnable::create(std::function<void ()> functionToRun)
Creates a QRunnable that calls functionToRun in run().
Auto-deletion is enabled by default.
This function was introduced in Qt 5.15.
See also run() and autoDelete().
[pure virtual] void QRunnable::run()
Implement this pure virtual function in your subclass.
void QRunnable::setAutoDelete(bool autoDelete)
Enables auto-deletion if autoDelete is true; otherwise auto-deletion is disabled.
If auto-deletion is enabled, QThreadPool will automatically delete this runnable after calling run(); otherwise, ownership remains with the application programmer.
Note that this flag must be set before calling QThreadPool::start(). Calling this function after QThreadPool::start() results in undefined behavior.
See also autoDelete() and QThreadPool.