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Next, in the main thread, we can create a new instance of our custom thread class and start it in order to execute our task in a new thread.

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We can run a task in a new thread by extending the threading.Thread class and overriding the constructor and the run() function.

We can then update the new thread to block for a few seconds, then request that the new thread terminate by setting the event.

The function will execute a loop five times. Each iteration it will block for a second, then report a message in an effort to simulate work and show progress.

Next, in the main thread we can create a new threading.Thread instance that is configured to execute our task() function in a new thread via the “target” argument.

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Every Python program has at least one thread of execution called the main thread. Both processes and threads are created and managed by the underlying operating system.

We may have a task in a custom function that is run in a new thread. The task may iterate, such as in a while-loop or a for-loop.

The new thread notices that the event is set and then exits the task loop, reporting a final message and terminating the new thread.

The new class must implement a constructor and call the constructor of the threading.Thread class to properly initialize the underlying thread instance.

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The new task function will execute in a loop and once finished the new thread will terminate and the main thread will terminate.

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If your task is executing in a daemon thread, then there is no need to stop it manually as it will be terminated for you once all non-daemon threads (e.g. the main thread) terminate.

Now that we know how to stop a custom function running in a new thread, let’s look at an example of stopping a custom thread class.

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Instead, you need to add frequent checks of the shared threading.Event and return from the task() function or run() function once the event is set.

The task thread checks the event which is discovered to be set (e.g, True). The thread breaks the task loop, reports a final message then terminates the new thread.

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Our task will be to execute a loop five times, block for a second to simulate work, and report a message. Then report a message once the task is complete.

Next, we can update the run() function to check the status of the threading.Event each iteration and to break the task loop once the event is set.

If your task involves blocking, such as reading or writing IO or waiting on another thread, you may want to adopt a busy wait and have the threading.Event checked each iteration.

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First, we will develop an example that extends the threading.Thread class, then we will look at how to update the example to stop the thread on demand.

If your task remains idle for some time, such as waiting for sporadic events, it may be able to wait on the threading.Event itself via the wait() function.

Firstly, we can update the constructor of our new thread class to take the shared threading.Event as an argument and then store it as a member variable.

The new thread executes in a loop, blocking for a moment and reporting progress. After five iterations of the loop, the new thread reports a final message and terminates.

Our custom thread class runs our task in a new thread of execution, looping five times. Each iteration it blocks for a moment then reports a message.

This can be achieved by sharing a threading.Event with the new thread and updating the run() function to check if the event is set each iteration. Once set, the run() function can exit, which will terminate the new thread.

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Meanwhile, the new thread executes its task loop, blocking and reporting a message each iteration. It checks the event each iteration, which remains false and does not trigger the thread to stop.

This function will run in a new thread once the thread is started via the start() function. Specifically we call start() and start() will call run() for us in a new thread of execution.

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First, we will develop an example that runs a custom function in a separate thread, then we will look at how to update the example to stop the thread on demand.

This can be achieved by creating a new threading.Event instance, passing it as an argument to the new thread, and then updating the custom function to check if the event is set each iteration. Once the event is set, the function can break its task loop and exit, terminating the new thread.

A threading.Event is a thread-safe boolean variable flag that can be either set or not set. It can be shared between threads and checked and set without fear of a race condition.

If the event is set true, we can exit the task loop or return from the task() function, allowing the new thread to terminate.