Messages Between Threads Handlers

After multiple threads run concurrently, such as a main application thread and a background thread, there needs to be a way to communicate between them. Some examples are

■ A main thread serves time-critical information and passes messages to the background time-consuming thread to update.

■ A large computation completes and sends a message back to the calling thread with the result.

This can be accomplished with handlers, which are objects for sending messages between threads. Each handler is bound to a single thread, delivering messages to it and executing commands from it.

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