synchronization

问题 I would like to understand that what is Mesh Object and its conection with silverlight, i am bit aware that it has got some relation with Local storage and then sync with the server data. But i would like to understand it fundamentally so if anyone can provide any link to the article for conceptual understanding or Step by step implementation of LiveMesh in Silverlight 3.0 application. 回答1: Mesh is a syncronisation platform which can be used to sync contacts and files (both objects) across

问题 I would like to understand that what is Mesh Object and its conection with silverlight, i am bit aware that it has got some relation with Local storage and then sync with the server data. But i would like to understand it fundamentally so if anyone can provide any link to the article for conceptual understanding or Step by step implementation of LiveMesh in Silverlight 3.0 application. 回答1: Mesh is a syncronisation platform which can be used to sync contacts and files (both objects) across

问题 I have several questions about the way GlusterFS synchronizes files. Is there a way I can get notified when a synchronization has finished on a client or a server ? For instance, are synchronizations logged somewhere ? Let's say I want to synchronize a whole directory, will it be synchronized file by file or once for all ? This can actually be an important information if I want to use things like inotify on synchronized directories. 回答1: GlusterFS is not a file sync utility, it is a virtual

问题 I'm reading operating system and I came across several problems for inter-process communication. These can be solved by using monitor concepts which java provide via synchronized keyword. I wish to know how synchronized keyword have been implemented? I tried to look at the source but I couldn't able to find it. Are synchronized are using system calls like down up ( which semaphore uses basically) to monitor the locks? Does JVM help in this process? I'm a novice in Java, I wish to know how

问题 I'm mostly familiar with Java, C and C++ in which there are ways to control that only one thread is accessing a resource at any given time. Now I'm in search for something similar but in PHP 5.x. To formulate my problem with one example: I have an ASCII-file which only stores a number, the value of a page load counter. At application deployment the file will simply hold a 0. For each access the value will be incremented by one. The goal is to keep track of page loads. The problem comes when

问题 I'm mostly familiar with Java, C and C++ in which there are ways to control that only one thread is accessing a resource at any given time. Now I'm in search for something similar but in PHP 5.x. To formulate my problem with one example: I have an ASCII-file which only stores a number, the value of a page load counter. At application deployment the file will simply hold a 0. For each access the value will be incremented by one. The goal is to keep track of page loads. The problem comes when

问题 Does the synchronize keyword need to be applied to each method of a class that implements the singleton pattern like this? public class Singleton { private Singleton(){} public synchronized static Singleton getInstance() { if(instance == null) instance = new Singleton (); return instance; } public void DoA(){ } } Since Singletons don't expose a public constructor and the getInstance() method is synchronized, one does not need to synchronize method DoA and any other public methods exposed by

问题 I want my android app's connection to be added in an existing contact. I am sending my all contacts of Phonebook to server(with Name,Phone Number, and Contact ID) to check which contacts are registered for my app. I will send back to client app the contact IDs which are matched. Now I want to add connection to those contacts in my Phonebook based on those returned IDs. How can I add app connection by editing the contact based on one of returned contact ID? Thanks 回答1: Try with this code, it

问题 I have N threads that do these things in loop: increase shared variable, checks if shared variable value is N (if so put value to queue) and do wait(). I have one more threat that checks the q variable. If queue is true, it does notifyAll(). After that N threads should wake up, and do another run of loop. But it seems that some threads are waking up without notification. I've read about spurious wakeups, but I don't know what condition should I put to while() to check if it was spurious wake

问题 I do not know if my tile line is clear enough... My problem is: I have a JS application that needs to wait for an event on the server. At the moment it polls continuous the server data via XMLHttpRequest every second. What I am thinking about is: Is it possible to make the call wait until for example a variable in PHP changes? I hope that my question is clear enough. Thanks! 回答1: You're looking for long polling (colloquially known as Comet). There are many examples on SO and elsewhere. http:/