New-style Signal and Slot Support — PyQt 4.12.3 Reference Guide New-style Signal and Slot Support¶ This section describes the new style of connecting signals and slots introduced in PyQt4 v4.5. One of the key features of Qt is its use of signals and slots to communicate between objects. Their use encourages the development of reusable components. A signal is emitted when something of potential interest ... Development/Tutorials/Python introduction to signals and slots Signals and slots and threading To send signal across threads we have to use the Qt.QueuedConnection parameter. Without this parameter the code will be executed in the same thread. How To Really, Truly Use QThreads; The Full Explanation ... Those who have discovered the joys of the Qt framework may assume that threads in Qt (QThread) are just like this, but they would be both wrong and right. Wrong because years of wrong documentation from Trolltech/Nokia on QThread has caused countless people to use QThreads in a convoluted and highly inappropriate manner.
Qt 4.7.0: Threads and QObjects
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How to Use Signals and Slots - Qt Wiki A developer can choose to connect to a signal by creating a function (a slot) and calling the connect() function to relate the signal to the slot. 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. QThreads general usage - Qt Wiki
PySide Signals and Slots with QThread example · Matteo Mattei
By default, you can not throw exceptions from signals and slots: Qt has caught an exception thrown from an event handler. Throwing exceptions from an event handler is not supported in Qt. You must reimplement QApplication::notify() and catch all exceptions there. Qt 4.6: Threads and QObjects | Signals and Slots Across … Threads and QObjects. QThread inherits QObject. It emits signals to indicate that the thread started or finished executing, and provides a few slots as well.Per-Thread Event Loop. Accessing QObject Subclasses from Other Threads. Signals and Slots Across Threads. Qt 4.8: Threads and QObjects | Signals and Slots Across …
The article, Multithreading Technologies in Qt, compares the different approaches. The rest of this article demonstrates one of these methods: QThread + a worker QObject. This method is intended for use cases which involve event-driven programming and signals + slots across threads. Usage with Worker class
Как работает механизм signal-slot QT, если нужно... —… Сам по себе принцып работы сигнал-слот в qt мне понятен (когда один объект передаёт сигнал в слот дургого объекта в одном потоке).> It is safe to connect signals and slots across different threads, thanks to a mechanism called queued connections. doc. qt.io/qt-5.4/qt.html#...
When designing pieces of Mixxx, every value that needs to be shared across threads must be guarded by locks in order to prevent nasty race conditions that can lead to invalid data and mysterious segfaults.