💰 Difference between Qt::QueuedConnection vs Qt::BlockingQueuedConnection

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BlockingQueuedConnection is a mix between DirectConnection and QueuedConnection. Like with a DirectConnection, the arguments can stay.


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Qt::BlockingQueuedConnection: This is the same as Qt::QueuedConnection, except that the signaling thread blocks until the slot returns. This connection must​.


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anariel-cats.rungQueuedConnection -> Same as QueuedConnection, except that the current thread blocks until the slot has been delivered. This connection type.


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Qt::BlockingQueuedConnection Queues up the signal, but doesn't return control to the emitter thread until the slot has been invoked and finishes. The receiver.


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BlockingQueuedConnection is a mix between DirectConnection and QueuedConnection. Like with a DirectConnection, the arguments can stay.


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anariel-cats.rungQueuedConnection -> Same as QueuedConnection, except that the current thread blocks until the slot has been delivered. This connection type.


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[Qt-interest] BlockingQueuedConnection where and how to?! Mihail Naydenov mlists at anariel-cats.ru Wed Dec 2 CET Previous message.


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Multithreading with Qt / qthread - Giuseppe D’Angelo

Knowledge Videos Blog. The real danger is that you must keep your design such that if in your application, you do a BlockingQueuedConnection from thread A to thread B, thread B must never wait for thread A, or you will have a deadlock again. The event queued is protected by a mutex, so there is no race conditions when threads push events to another thread's event queue. A better way to do it would be:. It is the destructor of QMetaCallEvent which will release the semaphore. This will wake up the dispatcher if it was sleeping while waiting for more events. Obviously, if you connect two objects using BlockingQueuedConnection living on the same thread, you will deadlock immediately. Meanwhile, the thread that called the signal will acquire the semaphore in order to wait until the event is processed. That later function will dispatch just the same way as QMetaObject::activate would do it for direct connections, as seen in Part 1. The event also contains a pointer to a QSemaphore. But we choose not to because BlockingQueuedConnection is something that can only be used if you know what you are doing: You must know from which thread to what other thread the event will be sent. So we'll have to copy the parameter values of the function on the heap. QMetaObject::activate will then look in internal data structures to find out what are the slots connected to that signal. Misc Contact Imprint Privacy Policy.{/INSERTKEYS}{/PARAGRAPH} Services Development Support Training. This article should conclude the series. When processed, that event will call the slot the same way we call them for direct connections. Once the event has been added to the queue, and if the receiver is living in another thread, we notify the event dispatcher of that thread by calling QAbstractEventDispatcher::wakeUp. A problem will typically appear when you need to terminate a thread using a BlockingQueuedConnection , for example in this pseudo code:. We will then be able to look up the particular type in the QMetaType database. Load Comments Loading comments embeds an external widget from disqus. I hope these articles have demystified signals and slots, and that knowing a bit how this works under the hood will help you make better use of them in your applications. Since the thread is blocked, the event will never be processed and the thread will be blocked forever. As seen in part 1, for each slot, the following code will be executed:. The downside is that MyOperation::cleanup is now called asynchronously, which may complicate the design. Like with a QueuedConnection , an event is posted to the other thread's event loop. The problem is that these pointers point to the stack of the signal where the arguments are. In order to do that, we just ask QMetaType. Click for the privacy policy of Google Feedburner. The code showed here has been slightly simplified and commented:. Qt detects this at run time and prints a warning, but does not attempt to fix the problem for you. Services Products Videos Blog. Hire us! Once the signal returns, they will not be valid anymore. A BlockingQueuedConnection can be useful to do thread communication when you want to invoke a function in another thread and wait for the answer before it is finished. You are sending an event to the sender's own thread and then are locking the thread waiting for the event to be processed. This is good because the event will be deleted right after it is delivered i. No need to copy the arguments. They are just calling QMetaObject::activate , with an array of pointers to arguments on the stack. Here is the code of a signal, as generated by moc: from part 1. When emitting the signal or calling QMetaObject::invokeMethod , you must not have any mutex locked that thread B might also try locking. It has been suggested that Qt could then just do a normal DirectConnection if both objects are in the same thread. Check disqus privacy policy for more information. All the information slot to call, parameter values, The argv coming from the signal is an array of pointers to the arguments. Get notified when we post a new interesting article! If the receiver is in the same thread, the event will be processed later, as the event loop iterates. Woboq About Us References. All the thread cleanup information transfer must only happen with events posted between threads, without using wait. {PARAGRAPH}{INSERTKEYS}In the first part , we saw that signals are just simple functions, whose body is generated by moc. Like with a DirectConnection , the arguments can stay on the stack since the stack is on the thread that is blocked. The thread that delivers the event will release the semaphore right after the slot has been called. However, it must be done with care. You cannot just call wait here because the child thread might have already emitted, or is about to emit the signal that will wait for the parent thread, which won't go back to its event loop.