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After reading some articles like this about Qt Signal-Slot communications I still have a question concerning the queued connection. Considering "the last one" in a multithread application might be slottiny, let's consider the last signal before the thread asked for the last signal, for the sake of simplicity, so new ones being sent while the thread looks for the last might be lost. I am asking this because I have multiple Box Slotting Bit Set threads receiving data from multiple threads, and I dont want them to process old data, just the last one that was sent.

I have run some tests, and bbit appears that Slottinng will process all the signals. I made one thread do:. I am sending a signal from one thread to the other every milliseconds, and the other thread sleeps for milliseconds 3 seconds and then wakes up and increment an internal variable by The result I am having is vit every time QCoreApplication::processEvents ; is called, all signals are executed I edited this part because I found a bug in my previous code.

I am trying to form my comment into an answer. I agree with you about that box slotting bit queue documentation is lacking this information, or at least it is not clear for me, and apparently for you either. Run this a few times and draw the conclusion.

You would need to read the source code for this how box slotting bit queue meta object compiler, aka.

This is a bit more involved investigation, but this could lead to certainity. As far as I know, every signal emission posting a corresponding event. Then, the event will be queued for the separate thread within the thread class. Here you can find the relevant two source code files:.

The main advantage is that signals could not be lost during the busy operation. However, this could be inherently slower as it can potentially process a lot more operation than needed. The idea is that the data is re-set for each event handled, but the real busy operation is queued for execution only once. Box slotting bit queue does not necessarily have to be the box slotting bit queue the first event if queje are more, but that is the simplest implementation.

The idea is to disconnect biy slot from the corresponding signal when starting the processing. This will ensure that new signal emission would not be caught, and connect the slot to the signal again once the thread is free to process the next events. This would have some idle time in the thread bt box slotting bit queue the connection and the next even handled, but at least this would be a simple way of implmeneting it.

It may actually be even negligible a performance difference depending on more context not really provided here. I was thinking if there was a convenient API - e. It does appear to be such an API, however, it is private. The relevant source code can be found here. The events are not dispatched, instead box slotting bit queue are removed from the queue. You should never need to call this function. If you do call it, be aware that killing events may cause receiver to break one or more invariants.

If box slotting bit queue is null, the events of eventType are removed for all objects. If eventType is 0, all the events are removed for receiver. You should never call this function with eventType of 0. If you do call it in this way, be aware that killing events may cause receiver to break one or more invariants.

Every queued slot call ends up in the posting of a Box slotting bit queue to the target object. The event contains the sender object, the signal id, the slot index, and packaged call parameters.

On Qt 5, the signal id generally doesn't equal the value returned by QMetaObject::signalIndex : it is an index computed as if the object only had signal methods and no box slotting bit queue methods.

The objective is to compress such calls box slotting bit queue that only one unique call exists in the event queue for a given tuple of sender object, sender signal, receiver object, receiver slot. This is the only sane way to do it, without having to make changes to source or target objects, and while maintaining minimal overhead.

The event-loop-recursing methods in my other answers have serious stack overhead per each event, on the order of 1kbyte when Qt is built for bit-pointer architectures. The event queue can be accessed when new events are posted to an object that has one or more events already sloting to it. In a reimplementation of this method, the contents of a QMetaCallEvent posted to the target object can be checked for a call to your slot, and the obsolete duplicate has to be deleted.

Pros: Neither the sender nor the receiver objects have to be aware of anything. Box slotting bit queue and slots work as-is, box slotting bit queue the method-pointer calls in Qt 5. Qt itself uses this way of compressing events. Cons: Requires inclusion of private Qt headers and forcible clearing of QEvent::posted flag.

Instead of hacking the QEvent::posted flag, the events to be deleted can be queued in a separate list and deleted outside of the compressEvent call, when a zero-duration timer is fired. This has the overhead of an extra list of events, and each event deletion iterating through the posted event list. It can be dealt with as follows:. A proxy object with signals and slots of same signatures as those of the target can be connected between the source and target objects.

Running the QMetaCallEvent on a proxy object allows extraction of the call type, the called slot id, and the arguments. In lieu of signal-slot connections, events can be explicitly posted to the target object. The target object, or an event filter, must explicitly re-synthesize the slot call from event's data.

A custom compressedConnect implementation can be used in lieu of QObject::connect. This fully exposes the details of the signal and slot. L2 The second limitation is not being able to completely reimplement QCoreApplication::compressEventsince the event list is defined privately. We still have access to the event being compressed, and box slotting bit queue can still decide whether to box slotting bit queue it or not, but there's no way to iterate the event list.

The event queue can be accessed implicitly by recursively calling sendPostedEvents from within notify thus also from eventFilterevent box slotting bit queue from the slots. This doesn't cause a deadlock, since QCoreApplication::sendPostedEvents can't and doesn't hold an event loop mutex while the event is delivered via sendEvent.

Events can be filtered as follows:. The duplicate events are still posted to the event queue. The recursive calls to notify from within sendPostedEvents consume quite a bit of stack space budget 1kb on bit-pointer architectures. The events already present can be removed by calling QCoreApplication::removePostedEvents before box slotting bit queue a new event Box Slotting Bit Zoom to an object. Unfortunately, doing this within QCoreApplication::compressEvent causes a deadlock as the event queue mutex is already held.

A custom event class that includes the pointer to the receiver object box slotting bit queue biit call removePostedEvents in the constructor. The set of those events is an implementation detail and could change. Qt doesn't discriminate among those events other than by the receiver QObject pointer. An implementation qieue the overhead of a proxy QObject per each event type, receiver object tuple.

The code below works on both Qt 4 and Qt 5. There are two event-removing code paths, selected by if true. The enabled code path retains the most recent event and box slotting bit queue most sense, typically. Box slotting bit queue, you could want to retain the oldest event - that's what the disabled code path does.

This box slotting bit queue another approach. It requires no changes to the sender nor receiver objects, but requires a custom CompressorProxy object.

This is portable to Box Slotting Bit Key both Qt 4 and Qt 5, and requires no access to Qt's internals. The compressor object must be a gox of the target object -- the one with the slots. That way it tracks the thread of the target object. Since the compressor's signals are attached to the target's slots, when they are in the same thread there is no overhead of queued connections for the target slot calls. For any box slotting bit queue set of queued slot calls to an slktting of CompressorProxyemitCheck bjt return true only exactly once for a slot that was called multiple times in a pass through the posted event list.

Note that the stack use per recursive call in release mode is around bytes slootting 32 bit architectures, and twice that on 64 bit architectures. This is a yet another approach portable to both Qt 4 and Qt 5, and requiring no access to Qt's internals other than what's available via public headers.

On Qt 5, only the Qt 4-style connections are supported. The compressed entities are receiver object, slot pairs. This is different than the sender, receiver, signal, big tuple used when one has full access to QMetaCallEvent.

Recursion into sendPostedEvents is used, just like in my other no-internals answer. Queued Queje The slot is invoked when control returns to box slotting bit queue event loop of the receiver's thread. The slot is executed in the receiver's thread. As you can see, event are sorted in priority order, so if all your events have the same priority, it is first in first out.

If you just want to always get the Box Slotting Bit Question last signal processed, and don't mind if few extra signals get processed as long as it does not make things slow, then you could try a very simple approach like this, using the regular QThread::exec event loop. Put these box slotting bit queue methods into a QObject box slotting bit queue, which you then move to a thread:. The publicReceiverSlotForQueuedSignals goes through very fast qDebug in else is probably the most time consuming part for rapid callsso it doesn't really matter how many signals are queued.

And then privateWorkerSlot will get invoked just one per box slotting bit queue loop box slotting bit queue of that thread, no matter how slowly it goes. Also it would be trivial to add a mutex to protect mReceivedData and mWorkerSlotInvoked in both qyeue methods and everywhere else you might use them. Then you could make a direct connection to the slot, because invokeMethod is thread safe, and mutex would make handling the private data members of MyClass slottihg safe as well.

Just make sure you box slotting bit queue the contents of mReceivedData to a local variable and unlock the mutex, before doing the time consuming processing of it.

You can use the combination of DirectConnection and QueueConnection :. If you mind a potential extra task drop, you can protect the Worker's working flag with mutex for tighter management.

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