Qt signals and slots are used for communication between objects in an application. Qt’s signal and slot mechanism ensures that if one of the objects should emit a signal, the connected slot will be executed in the thread where that object lives.
This is important because it means that the slot will have access to the resources of that thread, including any QObjects that live in that thread. This is what makes Qt signals and slots thread-safe.
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However, there are some caveats to this. First of all, while the slot will be executed in the same thread as the object that emitted the signal, it is possible for other threads to be running at the same time.
This means that if your slot code tries to access any shared resources, you need to make sure that those resources are protected by a mutex.
Secondly, you should be aware that signal emissions are asynchronous. This means that when you emit a signal, the slot code might not be executed immediately.
If you need to make sure that the slot has been executed before your code continues, you can use the QObject::signal() method, which blocks until all slots connected to a particular signal have been executed.
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In Qt, signals and slots are used for communication between objects. The signal/slot mechanism is a central feature of Qt and probably the part that differs most from other toolkits. Signals and slots are very powerful and they are core to how Qt works.
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Slots are functions that are executed in response to signals. Signals are emitted by objects when their state changes in a way that may be interesting to other objects. Qt’s signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal’s parameters at the right time.
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In Qt, signals and slots are used for communication between objects. The signal/slot mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. Signals and slots are very powerful and enable the objects to communicate with each other in a loosely coupled way.
