concurrency

问题 In a JavaFX application I wish to update a status bar according to some work logic which I've implemented in an other class. I can't figure out how to combine my desire to pass to work logic to the method (and not to write it inside the task) and to know about the work progress percentage. This is an example of the controller with the Task: public class FXMLDocumentController implements Initializable { @FXML private Label label; @FXML ProgressBar progressBar; @FXML private void

问题 In a JavaFX application I wish to update a status bar according to some work logic which I've implemented in an other class. I can't figure out how to combine my desire to pass to work logic to the method (and not to write it inside the task) and to know about the work progress percentage. This is an example of the controller with the Task: public class FXMLDocumentController implements Initializable { @FXML private Label label; @FXML ProgressBar progressBar; @FXML private void

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I'm looking for some nice real-world examples of the ABA-problem causing trouble in multithreaded code. The ABA-problem occurs in

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I'm looking for some nice real-world examples of the ABA-problem causing trouble in multithreaded code. The ABA-problem occurs in

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I'm looking for some nice real-world examples of the ABA-problem causing trouble in multithreaded code. The ABA-problem occurs in

问题 I'm trying to use a select in a loop to receive either a message or a timeout signal. If the timeout signal is received, the loop should abort: package main import ("fmt"; "time") func main() { done := time.After(1*time.Millisecond) numbers := make(chan int) go func() {for n:=0;; {numbers <- n; n++}}() for { select { case <-done: break case num := <- numbers: fmt.Println(num) } } } However, it doesn't seem to be stopping: $ go run a.go 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

问题 I have been doing some research in Google and cant quite get my head around the differences (if any) between concurrent and parallel programs in java. Some of the information I have looked at suggests no differences between both. Is this the case?? 回答1: It depends on who is defining it. The people who created the Go programming language call code Concurrent if it is broken up into pieces which could be treated in parallel, whereas Parallelism implies that those pieces are actually running at

问题 Does anyone know how to update a jTextfield every 5 secondes? Automatic. So no userinput is required. It is used to update time in a textfield. This is what i tried but then my program freezes. while(true){ Thread.sleep(1000); txtCheck.setText(convert.getCheck()); System.out.println("Ja"); } convert is a thread, i tried to throw an exception but failed, cause Eclise says Threads can't throw exceptions. Convert.getCheck: public String getCheck() { return check; } 回答1: You want to use a Swing

问题 I would like to create a generic method to await for a sequence of tasks to finish sequentially, retrieving the result of each one. This is the code I've created: public static class TaskMixin { public static async Task<IEnumerable<T>> AwaitAll<T>(this IEnumerable<Task<T>> tasks) { var results = new List<T>(); foreach (var t in tasks) { results.Add(await t); } return results; } } Is there a better or built-in way to do it? Notice Before writing the above method I tried with the built-in Task

问题 This question already has answers here : How can I pass a reference to a stack variable to a thread? (1 answer) Thread references require static lifetime? (1 answer) How do I use static lifetimes with threads? (2 answers) How can I send non-static data to a thread in Rust and is it needed in this example? (1 answer) Closed 1 year ago . Here's a toy example of my problem: use std::sync::{Arc, Mutex}; fn operate_in_chunks(vec: &mut Vec<f32>) { let chunk_size = 10; let mutex_vec: Arc<Mutex<&mut