synchronization

问题 Im working with a MS Sync Framework 2.0 on my project. I am using MS SQL Server 2005 as the main DB and SQL CE 3.5 for the client DB. Everything's working fine except that the schema from the main db is not copied to the local db. for example: I have a table with a PK column with uniqueidentifier datatype and a NEWID() default value. but when the schema is to be downloaded to the local database, the PK column is copied but the default value (NEWID()) is not reflected to the local DB schema.

问题 Hi i want to implement a client-server program that communicates with each other via shared memory. in the server side i have two threads. a writer thread and a reader thread. the writer thread puts some data into the queue and the reader thread reads from it and passes the data to the client side via shared memory.each client that has shmid can attach itself to it and read data from it... right now i get segmentation fault at client side when it comes to attach to shared memory. here is my

问题 I read this in the documentation: To use offline persistence, you don't need to make any changes to the code that you use to access Cloud Firestore data. With offline persistence enabled, the Cloud Firestore client library automatically manages online and offline data access and synchronizes local data when the device is back online. ... For Android and iOS, offline persistence is enabled by default. To disable persistence, set the PersistenceEnabled option to false . In Android, i create my

问题 I read this in the documentation: To use offline persistence, you don't need to make any changes to the code that you use to access Cloud Firestore data. With offline persistence enabled, the Cloud Firestore client library automatically manages online and offline data access and synchronizes local data when the device is back online. ... For Android and iOS, offline persistence is enabled by default. To disable persistence, set the PersistenceEnabled option to false . In Android, i create my

问题 I am attempting to create an onEdit type script that connects two sheets so that if the name of one of the sheets gets changed the other also gets changed. My idea so far was to maybe use the "oldValue" compared to the "value" in an if else operation but I cant figure out a way to get it to work. If it can't be done then that's fine but if it can then I would be very grateful. Thanks in advance. :) 回答1: Here's a simple onChange function that will get the old sheet name and the new sheet name

问题 How do you pause a thread until a condition becomes true without busy waiting? For example, suppose I'm checking to see whether playerOne.isWalking() Is going to be true and I want to run some code when it does become true. Again suppose playerOne is an instance of the class Player which then has the function isWalking(). I do not have access to the what makes isWalking() become true. So everytime I want to check to see if isWalking() is true, I have to call the method from an instance of

问题 As I Know only one thread can execute on a synchronize method on same block but in below producer consumer problem I am able to run both the methods. Sample Code import java.util.concurrent.CountDownLatch; public class VIV { public static void main(String[] args) throws Exception { Number no = new Number(); //Same Object is passed Even ev = new Even(no, 10); Odd od = new Odd(no, 10); Thread oddThraed = new Thread(od,"ODD"); oddThraed.start(); Thread evenThraed = new Thread(ev,"Even");

问题 Need a solution that creates 5 pthreads. Each pthread executes a function that involves iterating through a loop 10 times. In each iteration of the loop, a thread increments an int from 0 to 0.9*MAX_INT and then prints the iteration number. Make sure that each of the 5 threads finish the ith iteration of the loop before they can start the (i+1)th iteration (i.e. all threads synchronize/rendezvous towards the end of each iteration). I need to use a two-phase barrier implemented using POSIX

问题 How would I sync sound effects with an animation (CCAnimation) NSMutableArray* animationframes = [NSMutableArray array]; [animationframes addObject:[[[CCAnimationFrame alloc] initWithSpriteFrame:[TitleLayer spriteframeForFile:@"title_startanime01.png"] delayUnits:1 userInfo:nil] autorelease]]; [animationframes addObject:[[[CCAnimationFrame alloc] initWithSpriteFrame:[TitleLayer spriteframeForFile:@"title_startanime02.png"] delayUnits:1 userInfo:nil] autorelease]]; [animationframes addObject:[

问题 I receive an exception in production with message "Object synchronization method was called from an unsynchronized block of code" on Mutex.ReleaseMutex() in following code: Mutex Mutex { get { return mutex ?? (mutex = new Mutex(false, mutexName)); } } [NonSerialized] Mutex mutex; public void Log(/*...*/) { Mutex.WaitOne(); try { /*...*/ } finally { Mutex.ReleaseMutex(); } } There may be saveral processes which can use mutexes with different and same mutextName. And still I am not sure how