Thread.CurrentThread.ManagedThreadId多处理器是否安全

Question

Will Thread.CurrentThread.ManagedThreadId return the unique Id on the multiprocessor machine.

Explanation: I want to generate unique number. i generated unique number based on current time ie currentTmeinmillisecons but two threads access the same function in same timestamp so i want to add something unique in that timestamp. So planning to to add Thread.CurrentThread.ManagedThreadId in CurrentTimeInMilliseconds.

So can I add Thread.CurrentThread.ManagedThreadId in CurrentTimeInMilliseconds.

Answer 1

It's not clear what you mean by "add Thread.CurrentThread.ManagedThreadId in CurrentTimeInMilliseconds". Say, for ManagedThreadId+CurrentTimeInMilliseconds:

1+2 = 3
2+1 = 3

So are you actually creating a "unique" value in the end? What happens if you call it more than once per millisecond? If you need something that will be unique per-process per-call, I'd do something like:

using System.Threading;

static class Foo
{
    static long i;
    public static long GetUnique() { return Interlocked.Increment(ref i); }
}

If you want to generate a unique number over multiple processes, Guid is the way to go.