Deleting pointer sometimes results in heap corruption

Question

I have a multithreaded application that runs using a custom thread pool class. The threads all execute the same function, with different parameters.

These parameters

Answer 1

If you try to delete an object twice, the second time will fail, because the heap is already freed. This is the normal behavior.

Now, since you are in a multithreading context... it might be that the deletions are done "almost" in parallel, which might avoid the error on the second deletion, because the first one is not yet finalized.