We have an asynchronous task that performs a potentially long-running calculation for an object. The result is then cached on the object. To prevent multiple tasks from repeating the same work, we ...

When writing multithreaded applications, one of the most common problems experienced is race conditions. My questions to the community are: What is the race condition? How do you detect them? How ...

I debug Go programs in Visual Studio Code. How can I add the -race argument in launch.json file? I add config in launch.json like below, but it doesn't work. "args": ["-race"]

I have one table that is read at the same time by different threads. Each thread must select 100 rows, execute some tasks on each row (unrelated to the database) then they must delete the selecte...

Let's say I define a following C++ object: class AClass { public: AClass() : foo(0) {} uint32_t getFoo() { return foo; } void changeFoo() { foo = 5; } private: uint32_t foo; } aObject; The o...

Here are two potential workflows I would like to perform in a web application. Variation 1 user sends request server reads data server modifies data server saves modified data Variation 2: u...

I have an operation I need to get done N times and no more. The operation is done by many possibly parallel processes that recieve requests. A process has to check if the counter has exceeded N and...

I'm developing a website in Python using the (excellent) Flask framework. In the backend code I use APScheduler to run some cron-like jobs every minute, and I use Numpy to calculate some Standard D...

You can find on here a very good explanation about what is a race condition. I have seen recently many people making confusing statements about race conditions and threads. I have learned that ra...

I just got a juicy race condition. Consider the following classes: #include <atomic> #include <chrono> #include <iostream> #include <thread> class A { std::thread th; std...

I'm having trouble figuring out how to correctly use sync.Cond. From what I can tell, a race condition exists between locking the Locker and invoking the condition's Wait method. This example adds ...

When using the OAuth 2.0 JWT Refresh token implementation I came across the issue that it's really difficult to implement a solid Refresh Strategy on the Web Browser Client Side. Multiple Tabs can ...

Following the question from here, which explains to some degree why getting a std::stop_token internally instead of getting it as parameter to the thread wrapper function leads to a race-condition....

#!/bin/bash if [ ! -f numbers ]; then echo 0 > numbers; fi count=0 touch numbers echo $count > numbers while [[ $count != 100 ]]; do if ln numbers numbers.lock then count=`expr $count + 1`...

I'm reading this paper. On the page 11 the paper says: Unix applications can obtain access to files without encountering symlink races. This is important for normal application programmers who, fo...

I found the following example for condition variable on www.cppreference.com, http://en.cppreference.com/w/cpp/thread/condition_variable. The call to cv.notify_one() is placed outside the lock. My ...

In Django views, we can use select_for_update() to prevent race condition(lost update or write skew) so race condition doesn't happen in Django views with select_for_update(). *I used Django 3.2.16...

Is there a way to run the django tests using multiple threads and force the race condition? I want to make sure that the code path that handles the transaction errors is executed. To be slightly mo...

Consider the first thread function and global variables: std::mutex mut; std::condition_variable officer; bool firstPlayerIsReady = false; bool secondPlayerIsReady = false; void firstPlaye...

I'm trying to run a functional test for a node app. In my package.json I have the following scripts: "scripts": { "web-server": "NODE_ENV=test node app.js &", &q...

The problem my team and I have been trying to solve involves multiple ec2 instances each with their own independent, parallel access to the same S3 bucket. The issue arises as a race condition whe...

Using this question as basis I implemented a pseudo-random number generator with a global state: __global uint global_random_state; void set_random_seed(uint seed){ global_random_state = seed; ...

I searched in many web pages to find what phrase exact should I place in settings.json in VS Code Golang extension (released by Microsoft) to add a build flag (in my case, race detector)? I added:...

I have this validation rule on POST request method inside a controller: class CreateOrderController extends Controller { public function create(Request $request) { $this->validate($request, [...

I'm new to plpgsql and I'm trying to create function that will check if a certain value exists in table and if not will add a row. CREATE OR REPLACE FUNCTION hire( id_pracownika integer, imie ch...