synchronization

I am new to Multithreading and synchronization in java. I am trying to achieve a task in which i am given 5 files, each file will be read by one particular thread. Every thread should read one line from file then forward execution to next thread and so on. When all 5 threads read the first line, then again start from thread 1 running line no. 2 of file 1 and so on. Thread ReadThread1 = new Thread(new ReadFile(0)); Thread ReadThread2 = new Thread(new ReadFile(1)); Thread ReadThread3 = new Thread(new ReadFile(2)); Thread ReadThread4 = new Thread(new ReadFile(3)); Thread ReadThread5 = new Thread

How can I resolve the Gradle Sync problem? I installed the missing SDK versions but the error shown again. Take a look to the screenshots please... Screenshot 1 Screenshot 2 Thank you in advance. Your compileSdkVersion must be a number, not a String Example: android { compileSdkVersion 24 buildToolsVersion "24.0.2" defaultConfig { applicationId "com.yourpackage.yourapp" minSdkVersion 11 targetSdkVersion 24 versionCode 4 versionName "1.3" } ... } You also need to open up "build.gradle" script and change the classpath to latest gradle repository.... mine is 'com.android.tools.build:gradle:3.0.0

This question already has an answer here: Thread-safe setting of a variable (Java)? 5 answers Suppose I have two threads updating an object, and one thread reading from that object with no synchronization. Obviously, this is run condition. However, I am wondering if the variable itself can only partially written. public class CommonObject extends Object { static int memberVar=-1; } public class Input1Thread extends Thread { public void run() { while(true) CommonObject.memberVar = 1 } } public class Input2Thread extends Thread { public void run() { while(true) CommonObject.memberVar = 2; } }

I am building an app that will run on a user's iPhone and iPad. People will enter information on either device. I am looking for methods in which the data can be synchronized between the devices. Would I have to force people into something like iCloud or Dropbox? I think It would be a good idea to consider using iCloud as iOS 5 will soon make this the accepted standard and people will expect it. If you don't want any sort of server-side solution (i.e. iCloud or something you write yourself) then have you thought of bluetooth / wifi - assuming the users will have their devices near to each

I have Java-based web server, and I also have DAO singleton object with method, whose SQL operations' logic must be synchronized in some way in order to guarantee data integrity (method can be accessed from several Java threads simultaneously). I was wondering to know whether DB transaction wrapping (serializable level) is better than DAO's method explicit synchronization in server side? Yes, using transactions is better. With synchronizing in your code, locking on the class, the scope of that lock is your classloader, and standing up a second instance of your application will invalidate your

I have an issue with a task blocking when I try to retrieve it's result. I have the following piece of code I want executed synchronously (which is why I'm looking for the result) I would ignore the reason each call has to be made (legacy software that requires multiple calls through different layers) the call seems to break down after it starts the task for the final call to be made in the PostCreateProfile, I can see this request never makes it any further than this. if (CreateProfile(demographics).Result) // Task blocks here { //dothing } private async Task<bool> CreateProfile(Demographics

I need to write log data into a single file from different processes. I am using Windows Mutex which needs Common Language Runtime support for it. Mutex^ m = gcnew Mutex( false,"MyMutex" ); m->WaitOne(); //... File Open and Write .. m->ReleaseMutex() Do I really need to change from C++ to C++/CLI for synchronization? It is ok if the atomic is not used. But I need to know whether using this Mutex will slow down the performance compared to local mutex. Adding CLR support to your C++ application just to get the Mutex class is overkill. There are several options available to you to synchronize

I have 1417 days of sale data from 2012-01-01 to present (2015-11-20). I can't figure out how to have a single-year (Jan 1 - Dec 31) axis and each year's sales on the same, one year-long window, even when using ggplot's color = as.factor(Year) option. Total sales are type int head(df$Total.Sales) [1] 495 699 911 846 824 949 and I have used the lubridate package to pull Year out of the original Day variable. df$Day <- as.Date(as.numeric(df$Day), origin="1899-12-30") df$Year <- year(df$Day) But because Day contains the year information sample(df$Day, 1) [1] "2012-05-05" ggplot is still graphing