multithreading

问题 I am trying to write a script that will run a .exe program 4 times with different parameters. I created one thread for each .exe run. Each thread will write an output file. My problem is that, it should write in parallel, but as you can you see on the screenshot below, the file write one after another. How should this be resolved? Here's the main method: public static void main (String args[]) { ExecutorService executor = Executors.newFixedThreadPool(4); executor.execute(new RunnableReader(

问题 I am writing a threaded Python script for the first time and running into some trouble. The general idea is that a Raspberry Pi receives data from a Bluetooth connection, this data is then used to create a thread that calls the start_laps method. Once this thread is started, I need to continue listening for new data to determine if the thread should be killed. However, my code is not continuing execution after the thread is started. What would cause this? import json import bluetooth import

问题 I have a struct which holds an Arc<Receiver<f32>> and I'm trying to add a method which takes ownership of self , and moves the ownership into a new thread and starts it. However, I'm getting the error error[E0277]: the trait bound `std::sync::mpsc::Receiver<f32>: std::marker::Sync` is not satisfied --> src/main.rs:19:9 | 19 | thread::spawn(move || { | ^^^^^^^^^^^^^ `std::sync::mpsc::Receiver<f32>` cannot be shared between threads safely | = help: the trait `std::marker::Sync` is not

问题 This question already has answers here : c# thread method (5 answers) Closed 7 years ago . I am trying to create new thread and pass a method with parameter,but errors out. Thread t = new Thread(myMethod); t.Start(myGrid); public void myMethod(UltraGrid myGrid) { } ---------errors------------ Error: CS1502 - line 92 (164) - The best overloaded method match for ' System.Threading.Thread.Thread(System.Threading.ThreadStart) ' has some invalid arguments Error: CS1503 - line 92 (164) - Argument

问题 How to switch between threads of a suspended program? or Any tutorial on multi-threaded debugging with Intellij Idea describing basic features - suspend, resume, switch between threads. very good tutorials/step-by-step guide available for Netbeans: e.g. https://netbeans.org/kb/docs/java/debug-multithreaded.html 回答1: Trick is to set breakpoint suspend policy to - Thread. View breakpoint properties (right-click on breakpoint) Once done threads will hit breakpoint and block, now active thread

问题 I am learning about Thread in Java . I was tring to fetch which thread is running. But, I am not able to understand the order of the output. Following is my code public class practice extends Thread { public void run(){ for(int i=1;i<4;i++){ System.out.println(i); System.out.println(Thread.currentThread().getName()); } } public static void main(String[] args) { practice t1=new practice(); practice t2=new practice(); practice t3=new practice(); t1.start(); t2.start(); t3.start(); } } Output: 1

问题 What is the easiest way to call functions in an unmanaged dll from c#, always from the same thread? My problem: I have to use an unmanaged dll. This dll is not thread-safe and additionaly it has UI included that expects (like WPF) to be used always by the same thread. So it seems it regards the first thread that affects UI in the dll as its "main" thread. The "not thread-safe" problem I think would be resolved by using a semaphore. The "only from main thread" problem can be easily avoided by

问题 What is the easiest way to call functions in an unmanaged dll from c#, always from the same thread? My problem: I have to use an unmanaged dll. This dll is not thread-safe and additionaly it has UI included that expects (like WPF) to be used always by the same thread. So it seems it regards the first thread that affects UI in the dll as its "main" thread. The "not thread-safe" problem I think would be resolved by using a semaphore. The "only from main thread" problem can be easily avoided by

问题 I'm using a crate to interact with Postgres with simply writing sql queries by hands (Diesel seems for my simple case) and got stuck about the multithreaded access to the database client. Here is the code: use postgres::Client; pub struct Database{ connection: Arc<Client> } impl Database { pub fn from_config(url: &str) -> Database { //... } } fn main() { let url: String = //... let db = db::Database::from_config(&url); let db_ref = Arc::new(db); consume(future(Arc::clone(&db_ref))); // <-----

问题 I am trying to do a multi thread simulator where there are workers (threads) and jobs to solve, so every thread has to solve a job and start to solve the next in order, the integer of the job is the time in seconds that is required to solve the job, this is a simulation so the code prints the index of the thread with the initialization time of the job but it hasn't to be sleeping that number of seconds. The problem is that i'm getting a NullPointerException only when there are a lot of jobs