When writing multi-threaded applications, one of the most common problems experienced are race conditions. My questions to the community are: What is a race condition? How do you detect them? How ...
I have an order queue that is accessed by multiple order processors through a stored procedure. Each processor passes in a unique ID which is used to lock the next 20 orders for its own use. The stor...
I'm building a queuing mechanism of sorts. There are rows of data that need processing, and a status flag. I'm using an update .. returning clause to manage it: UPDATE stuff SET computed = 'working' ...
First, here's the concise summary of the question: Is it possible to run an INSERT statement conditionally? Something akin to this: IF(expression) INSERT... Now, I know I can do this with a stored...
How to prevent a race condition in MySQL database when two connections want to update the same record? For example, connection 1 wants to increase "tries" counter. And the second connection wants to ...
It's not entirely clear to me what transactions in database systems do. I know they can be used to rollback a list of updates completely (e.g. deduct money on one account and add it to another), but i...
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 race ...
This question relates to a comment in another posting here: Cancelling an Entity Framework Query I will reproduce the code example from there for clarity: var thread = new Thread((param) => ...
See bottom of question for an update, based on comments/answers: This question is really about the possibility of hidden threads that do not execute callbacks. I have a question about a potential a...
Here is a simple example of a django view with a potential race condition: # myapp/views.py from django.contrib.auth.models import User from my_libs import calculate_points def add_points(request): ...