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The Java tutorials say that creating a Thread is expensive. But why exactly is it expensive? What exactly is happening when a Java Thread is created that makes its creation expensive? I’m taking the statement as true, but I’m just interested in mechanics of Thread creation in JVM. Thread lifecycle overhead. Thread creation and teardown … 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
A sensitive operation in my lab today went completely wrong. An actuator on an electron microscope went over its boundary, and after a chain of events I lost $12 million of equipment. I’ve narrowed down over 40K lines in the faulty module to this: import java.util.*; class A { static Point currentPos = new Point(1,2); … Read more
I am trying to understand the disruptor pattern. I have watched the InfoQ video and tried to read their paper. I understand there is a ring buffer involved, that it is initialized as an extremely large array to take advantage of cache locality, eliminate allocation of new memory. It sounds like there are one or … Read more
I believe the Erlang community is not envious of Node.js as it does non-blocking I/O natively and has ways to scale deployments easily to more than one processor (something not even built-in in Node.js). More details at http://journal.dedasys.com/2010/04/29/erlang-vs-node-js and Node.js or Erlang What about Haskell? Can Haskell provide some of the benefits of Node.js, namely … Read more
Say we have these two Runnables: class R1 implements Runnable { public void run() { … } … } class R2 implements Runnable { public void run() { … } … } Then what’s the difference between this: public static void main() { R1 r1 = new R1(); R2 r2 = new R2(); r1.run(); r2.run(); … Read more
What is a coroutine? How are they related to concurrency? 13 Answers 13
I’ve searched the Swift book, but can’t find the Swift version of @synchronized. How do I do mutual exclusion in Swift? 23 Answers 23
I have investigated this problem for months now, came up with different solutions to it, which I am not happy with since they are all massive hacks. I still cannot believe that a class that flawed in design made it into the framework and no-one is talking about it, so I guess I just must … Read more
