Consider the case where we create a new thread and configure it to execute a custom task() function via the “target” argument. The thread is then started by calling the start() function.

Your free book "Parallel Loops in Python" includes complete and working code templates that you can modify and use right now in your own projects.

How to start and stop athreadin Java

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This approach is helpful if we are deep down the call-graph of custom functions and the return statement is not convenient.

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The new thread is terminated, leaving the main thread to continue on with the application, e.g. the Python interpreter process is not terminated.

If the threading.Thread class has been extended and the run() function overridden, then the “return” statement can be used in the run() function directly.

The default exception handler for new threads will report the exception to the console. This behavior can be changed by specifying an exception handler function via the threading.excepthook function.

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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.

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Threadclose Java

This approach to closing a thread is helpful if our target task function executing in a new thread has itself called a function and is deeper down the call graph, making the return statement ineffective at terminating the thread.

Discover how to use the Python threading module including how to create and start new threads and how to use a mutex locks and semaphores

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Because it is not caught, it will unravel the call graph from our custom functions, back up to the run() function, then terminate the new thread.

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The thread can then be started, and the main thread can then wait until the new thread has terminated before continuing on.

The downside of this approach is that the default handler for uncaught exceptions will report the exception to the terminal. This can be changed by specifying a handler via threading.excepthook.

Python closethreadfrom outside

The run() function of the threading.Thread class will call our task() function. Our task function will return eventually, then the run function will return and the thread will terminate.

The exception is not caught and bubbles up to the top-level of the thread, which is the run() function. The exception is then reported on the console and the thread is terminated.

Running the example creates and configures the new thread. The new thread is started, then the main thread blocks until the new thread closes.

The new thread loops forever, generating and reporting a random value each iteration. If the value is above the threshold, the thread raises an exception.

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In this case, the start() function executes the run() function of the threading.Thread class in a new thread and returns immediately.

Another approach is to call the sys.exit() function at any point within our task() function or in the functions it calls.

In this example, we will have a task that loops forever. Each iteration, it will generate a random number between 0 and 1, report the value then sleep for a fraction of a second. If the generated value is greater than 0.9, then the thread will choose to close immediately.

The main thread can then create and configure a new threading.Thread instance to run our task() function in a new thread of execution.

The task executes in a new thread looping forever. Each iteration, a random number is generated and reported. If the number is above the threshold, the function returns. The run() function for the thread then returns and the thread terminates.

The new thread loops forever, generating and reporting a random value each iteration. If the value is above the threshold, the thread terminates by calling sys.exit().