Qt 4.5 - Is emitting signal a function call, or a thread ... I am not sure about the nature of the signal/slot mechanism in Qt 4.5. When a signal is emitted, is it a blocking function call or a thread? Say this emit GrabLatestData(); // proceed with latest... How Qt Signals and Slots Work - Part 3 - Queued and Inter ... How Qt Signals and Slots Work - Part 3 - Queued and Inter Thread Connections ... Once the event has been added to the queue, and if the receiver is living in another thread ... activate to prepare a Qt::QueuedConnection slot call. The code showed here has been slightly simplified and commented: static void queued_activate(QObject *sender, ... Changing button text from another thread. | Qt Forum
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m_window3 to another thread after calling connect()? In that case, it may not work. belive this is what it is. mainwindow logMessage is a private member but guess i will have to make it public to access it from the other thread object. create a connect in the T_editor class that connects the signal logmessage with slot of mainwindow slot. Threading Basics | Qt 4.8 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. Synchronizing Threads | Qt 5.12 Qt's event system is very useful for inter-thread communication. Every thread may have its own event loop. To call a slot (or any invokable method) in another thread, place that call in the target thread's event loop. This lets the target thread finish its current task before the slot starts running, while the original thread continues running ... Slot on main thread not called when signal is ... - Qt Forum I think mainObject is not created in main thread. It would have been created by another worker thread. That thread may not have even loop. Just to ensure that can you print QThread::currentThreadID() in main and also in initialise method ? Also you don't have to do anything for inserting the slot in to main thread event loop.
How to invoke method on GUI thread but without have that method in ...
Why using QMetaObject::invokeMethod when executing method ... The reason to use QMetaObject::invokeMethod if the recipient object might be in another thread is that attempting to call a slot directly on an object in another thread can lead to corruption or worse if it accesses or modifies non-thread-safe data. c++ - How to emit cross-thread signal in Qt? - Stack Overflow
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Multithreading with Qt | Packt Hub Nov 16, 2016 · You can only push an object from your current thread to another thread. Conversely, you cannot pull an object that lives in another thread. You cannot change the thread affinity of an object if the object does not live in your thread. Once thread->start() is executed, we cannot call worker->moveToThread(this) unless we are doing it from this Qt Signals & Slots: How they work | nidomiro Qt Signals & Slots: How they work 7. Dezember 2016 5. And before we start with the next section here is a little trick to call a method of another thread inside the context of the other thread. ... So if you call the Signal of the QObject the method generated by Qt will enqueue the command to call the Slot in the Event-queue of the other ... c++ - does the slot function in Qt run on another thread ...
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Signals and slots were one of the distinguishing features that made Qt an .... can force a direct call from different threads, or a queued call from the same thread. How to use QThread properly : Viking Software – Qt Experts I will also explain how signals and slots work with threads and how they can help you or lead to problems. ... be deleted by another thread while your slot is being executed, of course. ... If these are the same, it does a direct signal to slot call. Qt Signals & Slots: How they work | nidomiro Dec 7, 2016 ... To connect a Signal to a Slot you can simply call QObject::connect(a, .... But if one is in another thread, a Qt::QueuedConnection is used instead ... How To Really, Truly Use QThreads; The Full Explanation | Maya's ... Nov 1, 2011 ... Use a mutex or other method to safely communicate with the thread if necessary. ... the signals, slots and methods to easily use the thread object within a Qt project. ... of the QObject instance and call start() on the QThread instance. ...... QObject::~QObject: Timers cannot be stopped from another thread.