synchronization

I'm trying to understand how threads work, and I wrote a simple example where I want to create and start a new thread, the thread, display the numbers from 1 to 1000 in the main thread, resume the secondary thread, and display the numbers from 1 to 1000 in the secondary thread. When I leave out the Thread.wait()/Thread.notify() it behaves as expected, both threads display a few numbers at a time. When I add those functions in, for some reason the main thread's numbers are printed second instead of first. What am I doing wrong? public class Main { public class ExampleThread extends Thread {

I have working Single Page Application using Breeze.js for Data Access. It uses the Breeze.js to execute queries against the local cache and the data is requested only once at start up. Only the data updates are posted back on the server afterwards. I am looking for a solution to make the application connection aware. If the mobile device does not have internet connection the changes will be saved locally with Breeze.js and HTML5 local storage. When the mobile device is back online the changes will be synched to the remote data storage. Any guidelines how to implement that requirement? Thanks

I am getting into Semaphores in Java and was reading this article http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/Semaphore.html . The only thing I don't get is why the acquire() method is not used in a synchronized context. Looking at the example from the above webiste: They create a semaphore: private Semaphore semaphore = new Semaphore(100); and get a permit just like this: semaphore.acquire(); Now, wouldn't it be possible that two or more threads try to acquire() at the same time? If so, there would be a little problem with the count. Or, does the semaphore itself handle

I am trying to look for scenarios where Sync Objects can be used in OpenGL. My understanding is that a sync object once put in GL command stream ( using glFenceSync() ) will be signaled after all the GL commands are executed and realized. If the sync objects are synchronization primitives why can't we MANUALLY signal them ? Where exactly this functionality can help GL programmer ? Is the following scenario a correct one ? Thread 1 : Load model Draw() glFenceSync() Thread 2 : glWaitSync(); ReadPixels Use data for subsequent operation. Does this mean that I can't launch thread 2 unless

Can I sync changes from a "model" site that I work on, across hundreds of sites on the SAME server using rsync ? I would be updating common template files and JS scripts. If possible how would I set this up? (I'm on a Hostgator Dedicated server, running Apache) The Surrican Read my extended answer for the edited question below. The most trivial and naive approach would probably to set up a script that just runs rsync for every server you want to synchronize. This is fine in most cases, but I don't think this is what you are looking for, because you would have figured that out yourself... This