connecting signal/slot across different threads between QObjects. ... Direct connection will execute in the thread where signal is emitted, and if receiving object lives in another thread, then the slot (and as a consequence, everything releated in the class) needs to be made thread safe. ... Qt: Connect Signals and Slots Across Differnet Files ... Threads and QObjects | Qt 4.8 Signals and Slots Across Threads. Qt supports these signal-slot connection types: Auto Connection (default) If the signal is emitted in the thread which the receiving object has affinity then the behavior is the same as the Direct Connection. Otherwise, the behavior is the same as the Queued Connection." c++ - Qt Signals and slot thread safety - Stack Overflow It depends on connection type you specified via calling connect function. The only way when slot will be launched concurrently is if you specified Qt::DirectConnection AND emitting signal in thread different from slot's thread. If you omit connection type, it would be Qt::AutoConnection.In this case if you emit a signal from one thread, and catching it in another one (e.g. in main GUI thread ... qt - how to connect a signal to a slot in a different ... Qt uses signals and slots normally in a single thread, so calling a signal will call a slot in the same thread signal called. Is it any way to use a signal-slot mechanism to pass a message to qt thread ( so slot will be called later in specified thread's context )?
Qt Hybrid Application Development: An application that combines elements from diverse sources such as native and the web is considered to be a Hybrid
Qt 4.8: Thread Support in Qt - Qt Documentation Snapshots 2016-3-9 · Qt provides thread support in the form of platform-independent threading classes, a thread-safe way of posting events, and signal-slot connections across threads. This makes it easy to develop portable multithreaded Qt applications and take advantage of multiprocessor machines. Various qt documentation fixes (wk 43) · qt/qt@08e5e81 @@ -57,8 +57,8 @@ specific thread. When a signal is emitted, the slot isn't called: immediately; instead, it is invoked when control returns to the: event loop of the thread to which the object belongs. Qt 4.8: QThread Class Reference 2016-7-14 · The code inside the Worker's slot would then execute in a separate thread. However, you are free to connect the Worker's slots to any signal, from any object, in any thread. It is safe to connect signals and slots across different threads, thanks to a mechanism called queued connections.
As you see, recived a QString: "Hello" is printed two times. This happens because we connected the same Signals & Slots two times (using different methods). In the case, you don’t want that, you see some methods to prohibit that and other options in the next section Connection Types.. One side note: if you are using Qt:: QueuedConnection and your program looks like the following example, at
QThread with signals and slots | Qt Forum The recommended way of working with threads in Qt has changed since the documentation was written. It is usually better not to add signals, let alone slots, to QThread. Instead, create a QObject (derived) instance, and call moveToThread on it to move it to the thread. Put your signals and slots in this worker object instead. Multithreaded programming for multicore architectures with ... Signals and slots across threads The straightforward mechanisms for multithreaded programming provided in the Qt framework, include the high-level abstraction for inter-object communication called ... Qt 4.5 - Is emitting signal a function call, or a thread ... @quark That's not exactly correct. It doesn't matter if the objects are in the same thread or not. It matters if the thread emitting the signal is the thread that the receiving object is in. The Qt documentation has even gotten this wrong. Source: Signals and slots across threads. I agree that Qt's behavior is logical. – Jordan Miner Mar 21 ...
sigslot - C++ Signal/Slot Library
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signals slots - Communication among threads in Qt - Stack ...
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I have a problem with signal/slots in a QThread class. My design looks like this: class Manager : public QObject { Q_OBJECT public: Manager(QObject* parent)The problem is that sending signals across threads results in queuing the signal into the target thread's event queue (a queued connection).