Here is an implementation of the ‘which‘ command which can tell where programs are located. /* SPDX-FileCopyrightText: 2021-2022 John Scott <jscott@posteo.net> * SPDX-License-Identifier: GPL-3.0-or-later */ /* We do not support the obsolete extension where an * omitted directory name is interpreted as the current * working directory. In $PATH = “/usr::/bin:”, the lack * of … Read more
Say I have a task like: for(Object object: objects) { Result result = compute(object); list.add(result); } What is the easiest way to parallelize each compute() (assuming they are already parallelizable)? I do not need an answer that matches strictly the code above, just a general answer. But if you need more info: my tasks are … Read more
I am aware that you can lock an object in c# using lock but can you give up the lock and wait for something else to notify you that it’s changed like you can in java with wait and notify? It seems to me that synchronised and lock in java and c# respectively are synonomous. … Read more
In my projects I am using BroadcastReceivers as a callback from a long running thread (eg. notify the activity that a download was finished and send some response data from a Worker Thread so that the activity can display the appropriate message to the user..). To use BroadcastReceivers I have to be careful to register … Read more
What is the difference between threading and parallelism? Which one has advantage over the other? Answer Daniel Moth (a former coworker of mine)- Threading/Concurrency vs Parallelism article explains it all. Quoted: To take advantage of multiple cores from our software, ultimately threads have to be used. Because of this fact, some developers fall in the … Read more
Every N minutes we want to run through a list of tasks. So we’ve created a task executor with a do { DoWork(); }while(!stopRequested) Now we want to have a pause between work cycles. Everyone seems to think Thread.Sleep() is the devil. I’ve seen mention of using Monitor/Event stuff but we don’t have someone else … Read more
I am working on a multithreaded project in which I need to spawn multiple threads to measure the end to end performance of my client code, as I’m doing Load and Performance testing. So I created the below code which is using ExecutorService. Below is the code with ExecutorService: public class MultithreadingExample { public static … Read more
Until now I was using std::queue in my project. I measured the average time which a specific operation on this queue requires. The times were measured on 2 machines: My local Ubuntu VM and a remote server. Using std::queue, the average was almost the same on both machines: ~750 microseconds. Then I “upgraded” the std::queue … Read more
I have a variable in my function that is static, but I would like it to be static on a per thread basis. How can I allocate the memory for my C++ class such that each thread has its own copy of the class instance? AnotherClass::threadSpecificAction() { // How to allocate this with thread local … Read more
I’m confused in join() method used in Threads in Java. In the following code: // Using join() to wait for threads to finish. class NewThread implements Runnable { String name; // name of thread Thread t; NewThread(String threadname) { name = threadname; t = new Thread(this, name); System.out.println(“New thread: ” + t); t.start(); // Start … Read more
