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 Qt documentation states that signals and slots can be direct, queued and auto.. It also stated that if object that owns slot 'lives' in a thread different from object that owns signal, emitting such signal will be like posting message - signal emit will Qt signaling across threads, one is GUI thread? - Stack Overflow What does it mean to move a object from one thread to another in Qt using moveToThread? Everything seems to work even before using moveToThread, which moves the object from one thread (GUI thread) to a another thread ( worked) and Qt:connect calls the appropriate Multithreading Technologies in Qt | Qt 5.12
c++ - How to Compress Slot Calls When Using Queued... -…
Qt Signals & Slots: How they work | nidomiro But if one is in another thread, a Qt:: QueuedConnection is used instead to ensure thread-safety. Please keep in mind, if you have both QObjects in the same thread and connected them the connection type is Qt :: DirectConnection , even if you move one QObject to another thread afterwards. How to Use Signals and Slots - Qt Wiki Qt's signals and slots mechanism does not require classes to have knowledge of each other, which makes it much easier to develop highly reusable classes. Since signals and slots are type-safe, type errors are reported as warnings and do not cause crashes to occur. How To Really, Truly Use QThreads; The Full Explanation ... This wrapper provides the signals, slots and methods to easily use the thread object within a Qt project. This should immediately show why the recommended way of using QThreads in the documentation, namely to sub-class it and implement your own run() function, is very wrong. A QThread should be used much like a regular thread instance: prepare an object (QObject) class with all your desired ... Qt 4.8: Threads and QObjects
does the slot function in Qt run on another thread? does Qt start another thread to run the slot function as the response to the second signal? And if it is so, is there some method to let the second call of slot function wait until the first call is finished?
Multithreaded programming for multicore architectures with ... 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 ... Qt 4.4.3: Thread Support in Qt - Club des développeurs Qt Thread Support in 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. "How to use QThread in the right way (Part 1)" — 1+1=10
cpgf callback -- an open source library for C++ callback…
Qt 4.8: Threading Basics Qt Thread Basics. QObject and Threads. Using a Mutex to Protect the Integrity of Data.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.
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. However, it must be done with care.
Текстовые метки: qt, сигнал, слот. Раздел: Компьютер - Программирование - Язык C++ - Библиотека Qt - Принципы написания кода.Сигналы и слоты используются для связи между объектами. Механизм сигналов и слотов - это основная особенность Qt и, вероятно, основная... c++ - How to Compress Slot Calls When Using Queued... -… Queued Connection The slot is invoked when control returns to the event loop of the receiver's thread.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).
Using Qt's Classes in Secondary Threads | C++ GUI ... - InformIT Using Qt's Classes in Secondary Threads. A function is said to be thread-safe when it can safely be called from different threads simultaneously. If two thread-safe functions are called concurrently from different threads on the same shared data, the result is always defined.