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
If I synchronized two methods on the same class, can they run simultaneously on the same object? For example: class A { public synchronized void methodA() { //method A } public synchronized void methodB() { // method B } } I know that I can’t run methodA() twice on same object in two different threads. … Read more
This question already has answers here: What is the best way to repeatedly execute a function every x seconds? [closed] (21 answers) Closed 6 years ago. Is there a way to, for example, print Hello World! every n seconds? For example, the program would go through whatever code I had, then once it had been … Read more
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won’t deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be POSIX conform, they … Read more
I have a method which returns a List of futures List<Future<O>> futures = getFutures(); Now I want to wait until either all futures are done processing successfully or any of the tasks whose output is returned by a future throws an exception. Even if one task throws an exception, there is no point in waiting … Read more
I have Java main class, in the class, I start a new thread, in the main, it waits until the thread dies. At some moment, I throw a runtime exception from the thread, but I can’t catch the exception thrown from the thread in the main class. Here is the code: public class Test extends … Read more
I am a bit of confused about Parallel.ForEach. What is Parallel.ForEach and what does it exactly do? Please don’t reference any MSDN link. Here’s a simple example : string[] lines = File.ReadAllLines(txtProxyListPath.Text); List<string> list_lines = new List<string>(lines); foreach (string line in list_lines) { //My Stuff } How can I rewrite this example with Parallel.ForEach? 6 … Read more
Is there an equivalent command in GDB to that of WinDbg’s !process 0 7? I want to extract all the threads in a dump file along with their backtraces in GDB. info threads doesn’t output the stack traces. So, is there a command that does? 4 Answers 4
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
I notice that it is often suggested to use queues with multiple threads, instead of lists and .pop(). Is this because lists are not thread-safe, or for some other reason? 4 Answers 4
