Static Function Concurrency ASP.NET

Question

If you have two threads invoking a static function at the same moment in time, is there a concurrency risk? And if that function uses a static member of the class, is there even

Answer 1

See here for a discussion on local variables. before your edit neither of the above methods themselves presented a concurrency risk; the local variables are all independent per call; the shared state (static int a) is visible to multiple threads, but you don't mutate it, and you only read it once.

If you did something like:

if(a > 5) {
    Console.WriteLine(a + " is greater than 5");
} // could write "1 is greater than 5"

it would (in theory) not be safe, as the value of a could be changed by another thread - you would typically either synchronize access (via lock etc), or take a snapshot:

int tmp = a;
if(tmp > 5) {
   Console.WriteLine(tmp + " is greater than 5");
}

If you are editing the value, you would almost certainly require synchronization.