synchronization

问题 for a project i need to parallelize a sudoku solver, that sequentially terminate in avarage in 0.005 seconds. For test i also count how many "computations" the program does to solve the sudoku, and the problem is that when i run it in multithreading, if i do a lot less "computations" of the sequential version, then the completion time of the program in multithreading is less than the sequential version, but if the sequential version does for instance 2000 computations to solve the sudoku, and

问题 I have this code doing what I want: TriggerSomeExternalProcess(); double secondsElapsed = 0; DateTime startTime = DateTime.UtcNow; double timeoutInSeconds = 10; while (secondsElapsed < timeoutInSeconds) { // TODO: this seems bad... secondsElapsed = DateTime.UtcNow.Subtract(startTime).TotalSeconds; } CheckStatusOfExternalProcess(); The goal is to TriggerSomeExternalProcess and then CheckStatusOfSomeExternalProcess - but that process runs on the same thread so I can't do Thread.Sleep() . It's

问题 There are tons of examples of how to wait for a thread to exit, but sometimes i need to wait just until several threads are "ready" or have reached certain milestone. After reading: What's the proper way to wait for a .NET thread to start up? and http://www.albahari.com/threading/ If i have understood correctly: Wait for one Child Task to be ready : //Main Method var wh = new AutoResetEvent(false); Task childTask = Task.Run(() => ChildTask(wh); wh.WaitOne(); //Child private void ChildTask

问题 I've been reading up on the differences between a HashMap , HashSet , and HashTable . A key thing I've been noticing is that I've seen that HashMap / HashSet are not synchronized while a HashTable is. However in a code base that I've seen before there are several places where a block like this is used: synchronized (hashSet) { //Some code involving the hashset } How is this possible if a HashSet isn't synchronized? Does the synchronized block simply allow us to use a non synchronous data

问题 I'm searching for a way to get my Files synchronized (task) from a web server (Ubuntu 14) to a local server (Windows Server). The web server creates small files, which the local Server needs. The web server is in a DMZ, accessible through SSH. Only the local server is able to access folders on web server. It tried using Programs like WinSCP, but I'm not able to set a "get"-Job. Is there a way to do this with SSH on Windows server without login every few seconds? Or is there a better solution?

问题 I'm searching for a way to get my Files synchronized (task) from a web server (Ubuntu 14) to a local server (Windows Server). The web server creates small files, which the local Server needs. The web server is in a DMZ, accessible through SSH. Only the local server is able to access folders on web server. It tried using Programs like WinSCP, but I'm not able to set a "get"-Job. Is there a way to do this with SSH on Windows server without login every few seconds? Or is there a better solution?

问题 I'm searching for a way to get my Files synchronized (task) from a web server (Ubuntu 14) to a local server (Windows Server). The web server creates small files, which the local Server needs. The web server is in a DMZ, accessible through SSH. Only the local server is able to access folders on web server. It tried using Programs like WinSCP, but I'm not able to set a "get"-Job. Is there a way to do this with SSH on Windows server without login every few seconds? Or is there a better solution?

问题 I have alot of syncrhounous functions that i want to execute before that are basic ajax requests, these request will render html to the DOM. In order to do this i had to execute all of this synchrounous requests one by one. But i somehow want to these synchrounous functions asynchrounous all at the same time and wait for them to finnish in order to speed things up. This has to happen inside a synchrounous function. But my understanding is that this doesnt work in javascript, but i would like

问题 I have alot of syncrhounous functions that i want to execute before that are basic ajax requests, these request will render html to the DOM. In order to do this i had to execute all of this synchrounous requests one by one. But i somehow want to these synchrounous functions asynchrounous all at the same time and wait for them to finnish in order to speed things up. This has to happen inside a synchrounous function. But my understanding is that this doesnt work in javascript, but i would like

问题 I have alot of syncrhounous functions that i want to execute before that are basic ajax requests, these request will render html to the DOM. In order to do this i had to execute all of this synchrounous requests one by one. But i somehow want to these synchrounous functions asynchrounous all at the same time and wait for them to finnish in order to speed things up. This has to happen inside a synchrounous function. But my understanding is that this doesnt work in javascript, but i would like