synchronization

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am working on an iPhone app. How to sync new events with iOS Calendar? 回答1: You can go-through this github code this will really help you if you want to syn with events in calander of you app... https://github.com/klazuka/Kal Hope this will solve your problem... Another one:- For implementing the calander and

问题 Does it make sense to synchronize java virtual machines with System.nanoTime () ? I mean : A call System.nanoTime () and puts the results in t1 A send a packet to B when the packet from A is received on B, B call System.nanoTime() and sends the result to A when the packet from B is received on A, A call System.nanoTime () and puts the results in t3, puts the time received in the packet from B in t2 timeshift = (t3 - t1) / 2 - t2 is it correct to use System.nanoTime to do that ? thanks ! 回答1:

问题 I have two threads in python (2.7). I start them at the beginning of my program. While they execute, my program reaches the end and exits, killing both of my threads before waiting for resolution. I'm trying to figure out how to wait for both threads to finish before exiting. def connect_cam(ip, execute_lock): try: conn = TelnetConnection.TelnetClient(ip) execute_lock.acquire() ExecuteUpdate(conn, ip) execute_lock.release() except ValueError: pass execute_lock = thread.allocate_lock() thread

问题 I have kind of a such scenario: (source: microsoft.com) Here i need to synchronize local server database with main DB server(example: computers in office are connected to office server and they use it like a local server, so that no sync is required.BUT computers in other office work with their local server too and we need synchronization between the offices though the main DB server.). As i see i cant use SQLCompact here. Is there a provider to do the server-to-server synchronization right

问题 I need to sync text and audio on many web pages. While the audio is played the text should be highlighted phrase by phrase (not word by word or by character so sync is necessary only for the start of the phrase). I'd like not to use a flash only solution and I'd prefer to use something more HTML friendly. I thought to use a combination of two plugins: JPlayer for the audio Jquery highligheter for highlighting the text I could then write a jquery script to cycle on the various phrases. The

问题 I don't quite understand the documentation for InitializeCriticalSectionAndSpinCount: http://msdn.microsoft.com/en-us/library/windows/desktop/ms683476(v=vs.85).aspx It says "You can improve performance significantly by choosing a small spin count ..." However, since waiting on a spinner is faster than waiting for an object, doesn't it make sense to have the SpinCount as high as possible? What am I missing? Thanks. (I am using it inside a C DLL used by a multi-threaded application) Here is the

问题 If I have a synchronized block and somewhere inside that block an exception is thrown that is not caught within the synchronized block, would the lock be relinquished when the exception propagates out of it?(the synchronized block) synchronized( mutex ) { throw new Exception( "" ); } 回答1: The lock is always released. From JLS §14.19: "If execution of the Block completes normally, then the lock is unlocked and the synchronized statement completes normally. If execution of the Block completes

问题 Inside a for-loop I'm controlling the simulation-step-based traffic simulator SUMO by retrieving and processing information of vehicles. To make sure that my program simulates in "real-time" (1 simulation-step = 1 second) I want to sleep my program after the processing phase until the next time step begins. To get better results I'm calculating the time stamp based on a initially taken reference time stamp. The loop looks like this: System.out.println("start of traffic simulation ..."); for

问题 My app uses local notifications based on the timing of events logged with Core Data. Any time there is a significant change in my Core Data store on the device, I call a function called updateLocalNotifications() that clears existing local notifications and sets up new ones based on the updated data in Core Data. My NSPersistentStoreCoordinator for Core Data is set up with NSPersistentStoreUbiquitousContentNameKey , so it syncs across devices automatically using iCloud. Ideally, if the user

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . I've been watching a lot of videos on data structures, and these terms are always being mentioned: synchronized/not synchronized and thread-safe/not thread-safe . Can someone explain to me in simple words what synchronized and thread-safe mean in Java? What is sync and what is