RACE | PowerShell module for executing ACL attacks | Command Line Interface library

I can't get two things to work together--something about a race condition in the way my axios promises are catching errors? Here are the details:

(1) When a user's JWT token expires, my APIs return a 401 and an axios intercept routes the user to logout.

In main.js

I have created a "lock" in Swift and an Atomic property wrapper that uses that lock, for my Swift classes as Swift lacks ObjC's atomic property attribute.

When I run my tests with thread sanitizer enabled, It always captures a data race on a property that uses my Atomic property wrapper.

The only thing that worked was changing the declaration of the property wrapper to be a class instead of a struct and the main question here is: why it works!

I have added prints at the property wrapper and lock inits to track the number of objects created, it was the same with struct/class, tried reproducing the issue in another project, didn't work too. But I will add the files the resembles the problem and let me know any guesses of why it works.

Lock

A similar question is already asked, but the answer did not help me solve my problem: Sklearn components in pipeline is not fitted even if the whole pipeline is?

I'm trying to use multiple pipelines to preprocess my data with a One Hot Encoder for categorical and numerical data (as suggested in this blog).

Here is my code, and even though my classifier produces 78% accuracy, I can't figure out why I cannot plot the decision-tree I'm training and what can help me fix the problem. Here is the code snippet:

If I send a message to a specific queue, before the queue has been created, a queue will be created automatically for me.

The problem is that it leads to a kind of race condition when new messages/queues are added. If my producer service starts and produces a message before the consumer service has started, then a new queue will be created with default values. When the consumer service starts, I would have hoped that it would reconfigure the existing queue with the specific config that I want, but it does not change anything (AutoDeleteOnIdle, MaxSizeInMegabytes, etc).

Is there a recommended way to do this? :thinking: Are receive (and subscription endpoints) something that should be configured globally by all services, so that "first one wins"?

The producer service:

Let's say I have SQL Server tables detailing marathon races, all of them alike. Each row is a participant and one of the columns is the finish time, [dbo].[marathon_X].[finish]. Let's assume [finish] is counted in minutes (int) for simplicity.

I'm stuck and could use help figuring out a query that divides the finish times for a certain race into deciles and counts the number of participants finishing within each decile. This so I can get an idea of the frequency distribution over different time segments (which, in this case, I expect to be something other than even, or normal for that matter).

So for example if the winner in a certain race finishes after 130 min and the last participant after 520 minutes, then in that particular race each finish time decile would be (MAX(finish) - MIN(finish))/10 = 39 min wide. And then 1st decile would be finish times within 130-168 min, 2nd would be 169-207 min, etc. I then need a count of the number of runners in each decile, the range of which will vary from race to race.

Probably stupidly simple but I haven't figured out how to NTILE this (or equivalent).

I am writing a small TCP sockets "library", and I ran into much trouble.

When something happens to the socket that causes it to be instantly closed and freed (regardless of background lingering, talking about user space here), which is only done within a locked mutex since the application I'm writing is multi-threaded, I need a way to tell all the other (potentially) waiting threads (on the same mutex) that want to do something with the socket: "I'm terribly sorry, but the socket has been destroyed and you cannot access it" so that they don't cause any segmentation fault or such.

The idea I had was: the mutex was part of the socket (socket = a structure that contains multiple things, including a mutex and a file descriptor) so I couldn't quite free the socket if other threads were waiting for it (undefined behavior), so the possible solution is to allocate the mutex, free the socket but not the mutex, set some flag (in the allocated memory) saying that the socket has been closed, and a counter so that the last thread waking up and getting notified that it cannot use the socket unlocks and destroys the mutex and frees the memory allocated. The mutex can still be accessed without segfault if we just store its pointer before acquiring the mutex (and the pointer won't ever change).

This solution has a fundamental problem though - what if between unlocking the mutex and freeing it by the last holder, the thread gets preempted and another one locks the mutex again (since you NEED to check socket-related stuff after you acquire the lock, so no way of knowing it got destroyed, unless you maybe use an atomic variable but then again, checking the atomic variable and locking the mutex as a whole are not an atomic operation). Or if you try to access the mutex on the already-freed socket. Undefined behavior emerges.

Any ideas how to solve this problem? I.e. how to destroy a socket so that other threads know about it to quit safely, and there are no race conditions? By quitting I mean aborting the socket function they were in, not cancelling or stopping the threads themselves.

I recently saw that Swift had introduced concurrency support with the Actor model in Swift 5.5. This model enables safe concurrent code to avoid data races when we have a shared, mutable state.

I want to avoid main thread data races in my app's UI. For this, I am wrapping DispatchQueue.main.async at the call site wherever I set a UIImageView.image property or a UIButton style.

I am trying to produce a race condition (assuming that there exists a critical section in the csfunc) with the following sample code:

So im trying to get a signup bot running and people can signup by reacting to a message. And when the signup closes, the bot post the random draw on another channel. however, when the bot writes the list of the users who signed up, it writes both ID,username, and i cannot for the love of god understand why the ID is being posted as well

Code: