multithreading

问题 I Have a function that I would like to run multiple time to reduce the overhaul processing of the function : function ModifyVAxisChartThreading(){ var nbChart=39; i++; for(var j=i;j<nbChart;j+=4) { Vmax=rangeMax[j*6]; Vmin=rangeMinId[j*6]; id=rangeMinId[(j*6)+1]; var delta=(Vmax-Vmin)*0.1; Logger.log("Vmax="+Vmax+"Vmin="+Vmin+"id="+id+"i="+j); var currChart = chart[id]; if(currChart.getType()!="COLUMN") { Vmin-=delta Vmax=Number(Vmax)+(delta*1.5)//Number() function to avoid Vmax becoming a

问题 Many programming languages like C++ (posix library) and Java provide the ability to play around with user-level threads. However, if all these user-level threads run in a single kernel thread - you only get the illusion of multiprogramming or multiprocessing (if multiple processors available) right ? I mean- still all these threads run in the same kernel thread. Am I right in saying that? And, if yes, then how exactly do we plan to get performance improvement using user-level threads ? EDIT:

问题 I have a custome wordpress site I run, if a customer ticks a box on an angularjs based application form, I need to open a new tab by posting into an admin-post.php action but also continue processing the angularjs application in the original tab. So the end result should be a new tab with a posted form and the existing tab with the results of the angularjs which is more ajax posts into the wordpress site. What is happening is the form submit into a new tab is hanging behind the processing

问题 I am developing test nodejs app, I want to create 100 "threads", each executed at some random time using setTimeOut. let count = 10; let counter = 0; for(let i = 0; i < count; i++) { // call the rest of the code and have it execute after 3 seconds setTimeout((async () => { counter++; console.log('executed thread',i, 'current counter is',counter); if(counter === count){ console.log('all processed'); } }), Math.random()*10); console.log('executed setTimeOut number ',i); } console.log('main

问题 I am using the following splash screen code with an onTouchEvent method. I am getting ANR's and do not know what to do. The app works perfectly, except occasionally it locks up with a Sorry, Activity xxx is not responding. Any ideas? _splashTime = 5000 ; // approx 5 seconds public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { _active = false; } return true; } Thread splashTread = new Thread() { @Override public void run() { try { int waited = 0;

问题 When a thread throws an exception that is unhandled, it terminates. What is the proper way to handle exceptions thrown on threads and how to propogate relevant exception data to other parts of the code that would need to subscribe to notifications? Is there an INotifyThreadPoorlyDesigned interface that I missed somewhere? Same applies for how to handle stuff dispatched to the WPF UI. 回答1: To handle work that throws an exception on a dispatcher thread, simply hook the Application:

问题 I have a situation in which I want a thread to process some sequential logic. This thread would need to interact with the main thread on occasion in order to update user input. But it should continue running otherwise without bothering the main thread. I am hopping to do this in an event-driven manner, so that the main thread doesn't have to pole the other thread for interrupts. What is the best way to do this? Is there an event-driven technique to communicating between threads much like

问题 I have a situation in which I want a thread to process some sequential logic. This thread would need to interact with the main thread on occasion in order to update user input. But it should continue running otherwise without bothering the main thread. I am hopping to do this in an event-driven manner, so that the main thread doesn't have to pole the other thread for interrupts. What is the best way to do this? Is there an event-driven technique to communicating between threads much like

问题 I have doubts about order of Thread execution in java. This example public class Thr implements Runnable { String string = "Yes "; public void run(){ this.string = "No "; } public static void main (String args[]){ Thr t = new Thr(); new Thread(t).start(); for(int i = 0; i < 10; i++) System.out.println(t.string); } } gives output : Yes No No No No No No No No No I have red this topic Java. The order of threads execution and I am confused why string is changed to no after first pass through for

问题 I need to decide whether to use 2 threads, or 2 processes (in either case, both will connect to the same database). 2 threads would be able to share the same memory, and there's no need for them to write to that shared memory: even though they are doing different jobs, they will only read from the memory and not change it. So my questions are: Might I have a problem when 2 different programs insert or extract values from the database if they both run at the same time? (I know that I can