synchronization

From sample example 4 of MSDN "Threading Tutorial" Following code errors out at the line commented with "---errors is here---". What is wrong? using System; using System.Threading; public class MutexSample { static Mutex gM1; static Mutex gM2; const int ITERS = 100; static AutoResetEvent Event1 = new AutoResetEvent(false); static AutoResetEvent Event2 = new AutoResetEvent(false); static AutoResetEvent Event3 = new AutoResetEvent(false); static AutoResetEvent Event4 = new AutoResetEvent(false); public static void Main(String[] args) { Console.WriteLine("Mutex Sample ..."); // Create Mutex

We're about to run side-by-side testing to compare a legacy system with a new shiny version. We have an Oracle database table, A, that stores data for the legacy system, and an equivalent table, B, that stores data for the new system, so for the duration of the test, the database is denormalized. (Also, the legacy system and table A are fixed - no changes allowed) What I want to do is to allow the infrequent DML operations on A to propagate to B, and vice-versa. I started with a pair of triggers to do this, but hit the obvious problem that when the triggers run, the tables are mutating, and an

What is the usage of synchronized statements? It is a java built in form of mutual exclusion. This is used for multithreaded applications. Sun concurrency tutorial This has a section about synchronized, but you should read the whole thing if you are trying to use multithreaded applications. Wiki mutex These are used for when you are building a program with many "threads". When main starts, it starts with one thread, which executes the steps in a sequence. You can start many more threads, which can then execute code at the same time. If you're executing the same code at the same time, things

Imagine you have a typical producer-consumer pattern in Java. To be a bit more efficient you want to use notify() and not notifyAll() when a new element is added to the queue. If two producer threads invoke notify, is it guaranteed that two distinct waiting consumer threads will be awoken? Or can it be that two notify() s fired shortly after each other cause the same comsumer thread to be queued for wakeup twice? I can't find the section is the API describing how this exactly works. Does java have some atomic internal operation for waking up threads exactly once? If only one comsumer is

I'm currently learning node.js and I see 2 examples for sync and asycn program (same one). I do understand the concept of a callback, but i'm trying to understand the benefit for the second (async) example, as it seems that the two of them are doing the exact same thing even though this difference... Can you please detail the reason why would the second example be better? I'll be happy to get an ever wider explanation that would help me understand the concept.. Thank you!! 1st example: var fs = require('fs'); function calculateByteSize() { var totalBytes = 0, i, filenames, stats; filenames =