synchronization

问题 Error: Can't clobber writable file : //file name// Solution: When you try to sync a file, perforce expects your files in workspace will have read-only permissions. But if a file is not checkout,(by p4 edit)but has write permission then it will throw the above error. Changing the file to read-only and syncing again will solve the issue. or try removing the workspace and get the latest revision again. 回答1: The "can't clobber writable" file error happens because Perforce is very cautious about

问题 Error: Can't clobber writable file : //file name// Solution: When you try to sync a file, perforce expects your files in workspace will have read-only permissions. But if a file is not checkout,(by p4 edit)but has write permission then it will throw the above error. Changing the file to read-only and syncing again will solve the issue. or try removing the workspace and get the latest revision again. 回答1: The "can't clobber writable" file error happens because Perforce is very cautious about

问题 I'm new to java. I'm little bit confused between Threadsafe and synchronized. Thread safe means that a method or class instance can be used by multiple threads at the same time without any problems occurring. Where as Synchronized means only one thread can operate at single time. So how they are related to each other? 回答1: The definition of thread safety given in Java Concurrency in Practice is: A class is thread-safe if it behaves correctly when accessed from multiple threads, regardless of

问题 I'm developping a distributed solution with a WebSite and a Corporate Application Management. Here is the architecture : Web Site : Database (SQL Server) Web Site : ASP.NET MVC Data synchronization Services (WCF) - Corporate Management Application : Database (SQL Server) WinForm Application Data synchronization Services (WCF) I want to perform Site-To-Site data synchronization. Note : The Corporate Management Application Database is the Warehouse datastore. Usually i want Corporate side asks

问题 I am a bit confused how it is possible that Warps diverge and need to be synchronized via __syncthreads() function. All elements in a Block handle the same code in a SIMT fashion. How could it be that they are not in sync? Is it related to the scheduler? Do the different warps get different computing times? And why is there an overhead when using __syncthreads() ? Lets say we have 12 different Warps in a block 3 of them have finished their work. So now there are idling and the other warps get

问题 I have the following code: public class Derived implements Runnable { private int num; public synchronized void setA(int num) { try { Thread.sleep(1000); } catch (InterruptedException e) { } System.out.println("Setting value " + Thread.currentThread().getName()); this.num = num; } @Override public void run() { System.out.println("In run: " + Thread.currentThread().getName()); setA(20); } public static void main(String[] args) { Derived obj = new Derived(); Thread t1 = new Thread(obj); t1

问题 I have the following code: public class Derived implements Runnable { private int num; public synchronized void setA(int num) { try { Thread.sleep(1000); } catch (InterruptedException e) { } System.out.println("Setting value " + Thread.currentThread().getName()); this.num = num; } @Override public void run() { System.out.println("In run: " + Thread.currentThread().getName()); setA(20); } public static void main(String[] args) { Derived obj = new Derived(); Thread t1 = new Thread(obj); t1

问题 I'm dying with physics , i've tried to use setVelocity however i got slightly different result from different devices. I've tested on iPhone 5 (on simulator) and iPhone 6 (real device) The Director::getInstance()->getOpenGLView()->getFrameSize() returns both devices is 640x1136 pixels But i see they have different result after the animation , its about 2-5 pixels. I really don't know why. I'm making a multiple player game so i need exactly same coordinate of objects on every devices. Does

问题 I have a Worker class and a MainForm/UI class. From the UI class I create a new instance of the Worker class in a new background thread. This thread marshals a few updates back to the UI's controls. Since they are in different classes I basically pass the MainForm instance (this) and an appropriate delegate to update the controls, into the worker class' constructor. In the constructor I set the mainForm to an ISynchronizeInvoke object (call it _synch) and then, further down in the worker

问题 I'm building a concert calendar that's very heavy on javascript (using jQuery). I'm having trouble synchronizing various events throughout the app, and I'm looking for suggestions for how to do this. An example of a simple use case: User clicks a month Calendar skips to that month An example of a more complex use case: User selects an artist Calendar determines the date of that artist's first show Calendar skips to that month Calendar highlights that artist's show(s) One occasional problem is