Python thread exit
Starting with Python 2.6, this module provides PEP 8 compliant aliases and properties to replace the camelCase names that were inspired by Java’s threading API. Example 1.
Once the thread finished, the GUI unfreezes and everything is back to normal. Example 1. Project: sql-editor Author: struts2spring File: BookThumbCrtl.py MIT License : However, doing so is dangerous and discouraged. Detect script exit. Threads interact strangely with interrupts: the KeyboardInterrupt exception will be received by an arbitrary thread. Note. Python doesn’t give you this ability, and thus forces you to design your thread systems more carefully. In other words, as soon as the main program exits, all the daemon threads are killed. If so, the … Project: sql-editor Author: struts2spring File: … otherwiese, use the higher level Threading module which provides a function Thread… To be able to terminate threads, the thread must be programmed to poll for exit at selected points.
I also tried using self.thread.exit(). Periodically, the loop checks if a threading.Event object has been set. We can send some siginal to the threads we want to terminate. One way to think about these definitions is to consider the daemon thread a thread that runs in the background without worrying about shutting it down.
In computer science, a daemon is a process that runs in the background.. Python threading has a more specific meaning for daemon.A daemon thread will shut down immediately when the program exits. even if a KeyboardInterrupt is thrown, like with .. #raises SystemExit inside my_thread cq.call(sys.exit, wait=1, raise_exception=2) The thread does not terminate at all, and the GUI freezes waiting for the thread to finish.
There's a Global Interpreter Lock that only lets a single Python thread run at a time. Here comes the problem: There is no terminate or similar method in threading.Thread, so we cannot use the solution of first problem.Also, ctrl-c cannot break out the python process here (this seems is a bug of Python).
We can see the exit of daemon thread about 5 seconds after the exit of the non-daemon. The functions quit(), exit(), sys.exit() and os._exit() have almost same functionality as they raise the SystemExit exception by which the Python interpreter exits and no stack traceback is printed.
This recipe is based on the idea of a thread whose main function uses a loop. The thread indeed does terminate, but at the same time it freezes the entire application.
Stopping a Python thread 9 posts ... thread.exit() Raise the SystemExit exception. We could catch a KeyboardInterrupt exception in the main thread and exit, but that wouldn't let our threads exit gracefully. By default, join() blocks indefinitely. If you ran some of the code above and hit Ctrl+C you might notice that it sometimes doesn't exit nicely.
The thread does not terminate at all, and the GUI freezes waiting for the thread to finish. Any thread can perform an alarm(), getsignal(), pause(), setitimer() or getitimer(); only the main thread can set a new signal handler, and the main thread will be the only one to receive signals (this is enforced by the Python signal module, even if the underlying thread implementation supports sending signals to individual threads). ... To have these features, build them on their own. The join() method can also be specified of a timeout value. We all know that Python can be a threading module to implement multithreading, but the module does not provide a way to pause, resume, and stop a thread, once the thread object calls the Start method, it can wait … They are from open source Python projects. No joy.