cppreference is explicit about calling std::shared_future<T>::wait from multiple threads: Calling wait on the same std::shared_future from multiple threads is not safe; the intended use is f...

I have a simple object @Data @Builder public class Address { private Long id; private String street; } I make delombok of @Builder annotation and I see next code generated @Data public class ...

I want to use a global variable, Init it once. having a thread safe access. Can someone share an example please?

I have the following class that is shared between multiple consumers (using producer/consumer methodology). My question involves the methods called on this class. Do I need to implement locks or is...

I'm making my application thread-safe. One of the steps is to synchronize access or eliminate usages of global variables. I'm using Visual Studio. I can't find any good way to find all global varia...

Are C/C++ fundamental types, like int, double, etc., atomic, e.g. threadsafe? Are they free from data races; that is, if one thread writes to an object of such a type while another thread reads fr...

I've heard about this happening in non thread-safe code due to improperly constructed objects but I really don't have the concept down, even after reading about in in Goetz's book. I'd like to soli...

I'm late to the party, but I recently learned about SemaphoreSlim: I used to use lock for synchronous locking, and a busy boolean for asynchronous locking. Now I just use SemaphoreSlim for everythi...

I am writing a library that makes extensive use of threading and would likely benefit from virtual threads in Java 21+. However, the library must also work for earlier versions of Java (possibly ba...

According to the thread-sanitizer docs: ThreadSanitizer uses more real memory than a native run. At the default settings the memory overhead is 5x plus 1Mb per each thread. Settings with 3x (les...

Odd even number printing using thread I came across this question and wanted to discuss solution in C++ . What I can think of using 2 binary semaphores odd and even semaphore. even semaphore initia...

What are some recommended approaches to achieving thread-safe lazy initialization? For instance, // Not thread-safe public Foo getInstance(){ if(INSTANCE == null){ INSTANCE = new Foo(); } ret...

Suppose I have this Python code: from itertools import count, tee original = count() # just an example, can be another iterable a, b = tee(original) The question is, will there be any problem if...

What is the thread safe way to dispose a lazy-initialized object in C#? Suppose I have the following Lazy construct: Lazy<MyClass> lazy = new Lazy<MyClass>(() => MyClass.Create(), t...

I have a webapp that I am in the middle of doing some load/performance testing on, particularily on a feature where we expect a few hundred users to be accessing the same page and hitting refresh a...

I'm curious about thread safety for hashes in Ruby. Running the following from the console (Ruby 2.0.0-p247): h = {} 10.times { Thread.start { 100000.times {h[0] ||= 0; h[0] += 1;} } } returns ...

I am currently working with AForge, and have an on new frame event that posts the frame, as a bitmap, into a picturebox. 90% of the time it works great... UNLESS I fiddle with something on the winf...

I'm looking for a way to do asynchronous and thread-safe logging in my C++ project, if possible to one file. I'm currently using cerr and clog for the task, but since they are synchronous, executio...

Everything I've read about volatile says it's never safe, but I still feel inclined to try it, and I haven't seen this specific scenario declared unsafe. I have a separate thread that renders a sc...

I have a JUnit test that I want to wait for a period of time synchronously. My JUnit test looks like this: @Test public void testExipres(){ SomeCacheObject sco = new SomeCacheObject(); sco.putWit...

Condition variables should have have a single order with respect to notify() and unlock_sleep() (an imaginary function call used within wait() where the mutex is unlocked and the thread sleeps as o...

Coding in Kotlin, want a thread-safe List as described here: java concurrent Array List access It seems Collections.kt does not have this function. Are Kotlin's mutable lists already threadsafe ? ...

I have a web API service that will accept many concurrent requests by different clients accessing two SQL Server databases, all the controllers (around 65) have a BaseApiController, find below the ...

I have the following class. class Test{ public HashSet<string> Data = new HashSet<string>(); } I need to change the field "Data" from different threads, so I would like some opinion...

I have a multithreaded program for which I'd like to use the Trace.WriteLine, and redirect the output to a text file: _LogTracer = new System.Diagnostics.TextWriterTraceListener(logPath); Trace.A...