synchronization

问题 I am trying to open up a selenium browser with sync option enabled. Either I specify --used-data-dir (having all the cookies and extensions from my google account loaded on selenium) or I don't, it stills won't allow me to sync. A way to check if the browser is allowed to sync is to go to settings -> people. If the browser is syncing a Sync on label/option must exist under your account name. If the browser is not syncing then this option is not there, and so you cannot change it. I have also

问题 In Java, why is unlocking called ( lock.unlock() ) after calling signal ( notEmpty.signal() and notFull.signal() )? The order is reversed in pthread. So why is the difference? Thanks. From The Art of Multiprocessor Programming, 1 class LockedQueue<T> { 2 final Lock lock = new ReentrantLock(); 3 final Condition notFull = lock.newCondition(); 4 final Condition notEmpty = lock.newCondition(); 5 final T[] items; 6 int tail, head, count; 7 public LockedQueue(int capacity) { 8 items = (T[])new

问题 I have viewmodel with nested json datasource. Here is my DEMO (use second contact "personal contact" for testing) [{ person_id:1, person_name:"John", contact: [ {email:"john@domain.com"} ] }] I am binding videmodel to grid with contacts detail template: + person => contact 1 => contact 2 Grid is editable using custom popup editor template, where I can edit person and contacts all in one form. Available personal contacts are presented using listview with form above it (click on the row binds

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I'm developing a Java application which is dealing with a huge amount (~ 1.000.000) of key-value-pairs. The keys have a fixed size

问题 I just stumbled across CouchDB and PouchDB sync features. Typically web applications have an application server implementing authentication, rights and business logic allowing to limit users access to specific resources/records. This brought up several questions in my mind: Is it possible to limit access to records within couch db. Eg. a super-admin sees everything, a department-manager everything of his department and a simple user only his own records or e.g. tasks assigned to him? Is

问题 I'd like to get notified when a specific file get accessed (AFAIK, most generally for a Userland code - by CreateFile() / NtCreateFile() ) I already know about FileSystemWatcher which should do the same within the .NET environment, But I'm working in plain C + WinAPI . As for the type of notification , raising a specified Event would be perfect, but sending a callback to be called , will also work. 回答1: See FindFirstChangeNotification function in WinAPI and related links. Alternatively, when

问题 I'm trying to write a subj queue, but I get deadlocks and other multithreading problems. I want to use Interlocked.CompareExchange to avoid lock usage. But this code doesn't work as expected: it just wipe entire Queue. What am I doing wrong here? public class FixedSizedQueue<T> : IEnumerable<T> { readonly ConcurrentQueue<T> _queue = new ConcurrentQueue<T>(); public int Limit { get; set; } public FixedSizedQueue(int limit) { Limit = limit; } public void Enqueue(T obj) { _queue.Enqueue(obj); if

问题 I have a remote web server that I have full access to (ssh, git, etc.). I want to be able to edit files on my computer and push them to the remote server. When I use a bare repository it doesn't change the file, but when I use a non-bare repository it complains with the following message: remote: error: refusing to update checked out branch: refs/heads/master remote: error: By default, updating the current branch in a non-bare repository remote: error: is denied, because it will make the

问题 Only one instance of my Java application can run at a time. It runs on Linux. I need to ensure that one thread doesn't modify the file while the other thread is using it. I don't know which file locking or synchronization method to use. I have never done file locking in Java and I don't have much Java or programming experience. I looked into java NIO and I read that "File locks are held on behalf of the entire Java virtual machine. They are not suitable for controlling access to a file by

问题 For instance, for the incoming audio stream at the receiver, this webRTC internal function gives me the RTP timestamp! http://www.webrtc.org/reference/webrtc-internals/voevideosync#TOC-GetPlayoutTimeStamp You could sniff all this information using WireShark. But I am looking to access this via a javascript function request? 回答1: As you can see in the url you shared, that documentation is under "webrtc-internals" and describes how browsers should implement WebRTC inside the browser. Those low