@Pedro: I don't think you get the point of this article. We are still sleeping for 10 seconds at the end of each iteration, but if the thread is stuck in the exit_thread.wait(timeout=10) call at the exact moment the event's set() method is called from somewhere else, then the call will promptly return True and the thread will exit. In these and many other situations you will need to figure out a way to make your script wait, and this isn't as easy as it sounds if you want to do it properly! We probably met a playmate on MapleStory and got married, thinking that they were "the one." 2020-03-06T10:24:22Z. Hello, and thank you for visiting my blog!
This type of wait loop is often called a busy wait. In the following sections I'm going to show you a few different ways to implement this wait, starting from the worst and working my way up to the best. Use a WaitHandle. Thansks very much ! If you need to wait for a subprocess to end, the subprocess package provides some functions to launch and wait for processes. Is splitting a REST API server from a Web server considered a security threat? You didn't mention anything about Threads in your answer. But of course we want to report the result at the exact moment it is available. 2019-02-13T23:42:59Z.
If you are using the asyncio package, then you have access to similar types of waiting functions. For example, consider this common pattern when writing a background thread function: Here we are trying to write a thread that can be terminated gracefully by setting the exit_thread global variable to True.
Why are people protesting against supreme court nominee Amy Coney Barrett? @Igor: I'm sorry but I don't understand your logic. If you want to learn modern web development techniques with Python and Flask, you may find the second edition of my O'Reilly book useful: I'm a software engineer, photographer and filmmaker, currently living in Drogheda, Ireland. So, I can, but I'm not seeing how this is going to help me, the thing is, I have my main program running, a text is shown to the user, he can add the text to one class or pass that text to another, so that he can decide after where to put the text. The answer to this question has a very clear description of your options with this method.
This is a pretty common pattern, but by now you can probably identify why this isn't a great solution, right? Test to see if we can access port 80 on www.google.com, and if it is available, echo the message google is up: You can set your own timeout with the -t or --timeout option.
I have written a web crawler that sends an SMTP message once a certain element on a page has changed. As with Mitch's answer. It's possible that an event can become unsubcribed between the if and the EventName(this,EventArgs.Empty) - it's happened to me before. How do I substitute almond flour for all purpose flour?
This thread is still going to produce a result, but it is not going to exit immediately after that, it will continue running and doing some more work: If you run the above version of the example, the result is going to be reported 10 seconds late, because the thread remains running for that long after generating the result.
If you enjoyed this article, please consider supporting my work on this blog on Patreon! Here is the complete code, if you want to run it or study it in more detail: Event objects are not the only way to wait for events in your application, there are more ways, some of which may be more appropriate than events, depending on what you are waiting for. Here are the changes to the background thread to report progress percentages in a progress global variable: And now we can build a more intelligent wait that reports the percentage of completion every 5 seconds: This new while loop is going to wait for the result_available event for up to 5 seconds as an exit condition.
How was collision detection done on the Asteroids arcade game?
Asking for help, clarification, or responding to other answers. ManualResetEvent is a WaitHandle as jrista suggested.
What I'm going to do is take the code from the previous section and expand it to show a completion percentage while the wait is taking place. As it's about this specific answer I think it probably makes more sense here. @Manuel: you need to show me the code that you are using, I can diagnose the problem without seeing the code. I didn't go through the entire "thread" (pun intended), but I did reach "The Good #2: Waiting on an Event". #25 Miguel Grinberg said What is the smallest digraph whose reflexive, symmetric, transitive closures (in all combinations) are distinct? The loop exited at 75 seconds, but the background task finished at 61, so the wait extended for an extra 14 seconds!
In this case since that loop might waste 0.00000001% of the CPU and the OP is coding in C#, replacing this with something 'more efficient' would be a complete waste of time. `read` command is used to take user input in a bash script. This is documented in my blog post: http://www.adamthings.com/post/2012/07/11/ensure-threads-have-finished-before-method-continues-in-c/. How should one take advantage of the "premove" function on chess.com? I perhaps didn't make that obvious enough in my answer.
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