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The QtConcurrent::run() function runs a function in a separate thread. The return value of the function is made available through the QFuture API.
This function is a part of the Qt Concurrent framework.
Running a Function in a Separate Thread
The event loops of Qt are a very valuable tool for inter-thread communication. Every thread may have its own event loop. A safe way of calling a slot in another thread is by placing that call in another thread's event loop. This ensures that the target object finishes the method that is currently running before another method is started. The connection mechanism uses a vector indexed by signals. But all the slots waste space in the vector and there are usually more slots than signals in an object. So from Qt 4.6, a new internal signal index which only includes the signal index is used. While developing with Qt, you only need to know about the absolute method index.
To run a function in another thread, use QtConcurrent::run():
This will run aFunction in a separate thread obtained from the default QThreadPool. You can use the QFuture and QFutureWatcher classes to monitor the status of the function.
To use a dedicated thread pool, you can pass the QThreadPool as the first argument:
Passing Arguments to the Function
Passing arguments to the function is done by adding them to the QtConcurrent::run() call immediately after the function name. For example:
A copy of each argument is made at the point where QtConcurrent::run() is called, and these values are passed to the thread when it begins executing the function. Changes made to the arguments after calling QtConcurrent::run() are not visible to the thread.
Returning Values from the Function
Any return value from the function is available via QFuture:
As documented above, passing arguments is done like this:
Note that the QFuture::result() function blocks and waits for the result to become available. Use QFutureWatcher to get notification when the function has finished execution and the result is available.
Qt Execute Slot In Another Thread Size
Running a Function in a Separate Thread
The event loops of Qt are a very valuable tool for inter-thread communication. Every thread may have its own event loop. A safe way of calling a slot in another thread is by placing that call in another thread's event loop. This ensures that the target object finishes the method that is currently running before another method is started. The connection mechanism uses a vector indexed by signals. But all the slots waste space in the vector and there are usually more slots than signals in an object. So from Qt 4.6, a new internal signal index which only includes the signal index is used. While developing with Qt, you only need to know about the absolute method index.
To run a function in another thread, use QtConcurrent::run():
This will run aFunction in a separate thread obtained from the default QThreadPool. You can use the QFuture and QFutureWatcher classes to monitor the status of the function.
To use a dedicated thread pool, you can pass the QThreadPool as the first argument:
Passing Arguments to the Function
Passing arguments to the function is done by adding them to the QtConcurrent::run() call immediately after the function name. For example:
A copy of each argument is made at the point where QtConcurrent::run() is called, and these values are passed to the thread when it begins executing the function. Changes made to the arguments after calling QtConcurrent::run() are not visible to the thread.
Returning Values from the Function
Any return value from the function is available via QFuture:
As documented above, passing arguments is done like this:
Note that the QFuture::result() function blocks and waits for the result to become available. Use QFutureWatcher to get notification when the function has finished execution and the result is available.
Qt Execute Slot In Another Thread Size
Additional API Features
Using Member Functions
QtConcurrent::run() also accepts pointers to member functions. The first argument must be either a const reference or a pointer to an instance of the class. Passing by const reference is useful when calling const member functions; passing by pointer is useful for calling non-const member functions that modify the instance.
For example, calling QByteArray::split() (a const member function) in a separate thread is done like this:
Calling a non-const member function is done like this:
Using Lambda Functions
Qt Execute Slot In Another Thread Rod
Calling a lambda function is done like this:
Qt Execute Slot In Another Thread Chart
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