Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 2 years ago. Improve this question I’m new to multithreading, and was … Read more
java.util.concurrent API provides a class called as Lock, which would basically serialize the control in order to access the critical resource. It gives method such as park() and unpark(). We can do similar things if we can use synchronized keyword and using wait() and notify() notifyAll() methods. I am wondering which one of these is … Read more
Does @synchronized not use “lock” and “unlock” to achieve mutual exclusion? How does it do lock/unlock then? The output of the following program is only “Hello World”. @interface MyLock: NSLock<NSLocking> @end @implementation MyLock – (id)init { return [super init]; } – (void)lock { NSLog(@”before lock”); [super lock]; NSLog(@”after lock”); } – (void)unlock { NSLog(@”before unlock”); … Read more
How do atomic / volatile / synchronized work internally? What is the difference between the following code blocks? Code 1 private int counter; public int getNextUniqueIndex() { return counter++; } Code 2 private AtomicInteger counter; public int getNextUniqueIndex() { return counter.getAndIncrement(); } Code 3 private volatile int counter; public int getNextUniqueIndex() { return counter++; } … Read more
Does c# have its own version of the java “synchronized” keyword? I.e. in java it can be specified either to a function, an object or a block of code, like so: public synchronized void doImportantStuff() { // dangerous code goes here. } or public void doImportantStuff() { // trivial stuff synchronized(someLock) { // dangerous code … Read more
I think both are doing the same job,how do you decide which one to use for synchronization? 8 Answers 8
Whenever a question pops up on SO about Java synchronization, some people are very eager to point out that synchronized(this) should be avoided. Instead, they claim, a lock on a private reference is to be preferred. Some of the given reasons are: some evil code may steal your lock (very popular this one, also has … Read more
I see that for using objects which are not thread safe we wrap the code with a lock like this: private static readonly Object obj = new Object(); lock (obj) { // thread unsafe code } So, what happens when multiple threads access the same code (let’s assume that it is running in a ASP.NET … Read more
I forked a project, applied several fixes and created a pull request which was accepted. A few days later, another change was made by another contributor. So my fork doesn’t contain that change. How can I get that change into my fork? Do I need to delete and re-create my fork when I have further … Read more
That’s pretty easy: class Sample { private String message = null; private final Object lock = new Object(); public void newMessage(String x) { synchronized (lock) { message = x; } } public String getMessage() { synchronized (lock) { String temp = message; message = null; return temp; } } } Note that I didn’t either … Read more
