Qt invoke slot another thread

By author

invokeMethod in other thread invokeMethod in other thread ... InitLoLaSocket is the signal of the emitting class whereas InitLoLaUDPsocket is the slot of the target class running in another thread. still thinking about the others ... Reply Quote 0. ... I suspect you want to provide a blocking queued call (i.e. Qt::BlockingQueuedConnection) ...

The thread that delivers the event will release the semaphore right after the slot has been called. Meanwhile, the thread that called the signal will acquire the semaphore in order to wait until the event is processed. gui, wallet: random abort (segmentation fault) running master I'm running the current master branch version (1c2edd9). I recently saw it crash shortly after starting up. $ ./bitcoin-qt *** Error in `./bitcoin-qt': free(): invalid next size (fast): 0x00007f6fabfb5f90 *** Aborted $ Unfortunately I do. Qt Signals & Slots: How they work | nidomiro

Effective Threading Using Qt - John's Blog

Multithreaded programming for multicore architectures with Qt ... 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. ... to sleep until woken up by ...

Qt Multithreading in C++: The Missing Article | Toptal

The Qt:: QueuedConnection will ensure that the Slot is called in the thread of the corresponding QObject. It uses the fact, that every thread in Qt ( QThread) has a Event-queue by default. 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 QObjects thread ... Multithreading with Qt - conf.qtcon.org QObject: thread affinity Thread safety in Qt p.30 What about QObject? QObject itself is thread-aware. Every QObject instance holds a reference to the thread it was created into (QObject::thread()) We say that the object lives in, or has affinity with that thread We can move an instance to another thread by calling QObject::moveToThread(QThread *)

You could use the same technique to communicate the results back, but it would probably make more sense to add a signal to the worker object that is emitted when it's done. Attach this signal to a slot of some object living in your main thread and Qt will again take care to execute the slot in the main thread, not in the worker thread.

[SOLVED] run a function in another thread. ... You can't call a method of an object in another thread directly so instead you use signals and slots, which are thread safe, to it for you and to inform you of when the thread has started and finished. ... Using signals and slots to communicate between threads is thread-safe by intent and design as ... QThread, execute slot without signal | Qt Forum I have been researching about QThreads, and have found out that the best way to use thread is to inherit a QObject and then move that to another thread. Signals are important, because with a queued connection, I don't have to worry about locking anything.... Threads Events QObjects - Qt Wiki A function is thread-safe if it's safe to invoke it from more than one thread at the same time even if the invocations reference shared data. Events and the event loop. Being an event-driven toolkit, events and event delivery play a central role in Qt architecture. Qt: Access GUI From Another Thread? - Allegro Apparently in Qt you can only access GUI elements from the GUI (main) thread. I need to use multiple threads to do work while keeping the GUI responsive, and yet the worker threads need to modify the GUI. Qt does provide an Event system that's thread-safe, but writing all those different events is not something I look forward to.