NSLog 10b means?

Question

Whenever I use NSLog (), it always displays this mysterious “10b” next to the process id. I know this has something to do with where the NSLog () call was called, but what exactly does this mean? When I try NSLog () from another thread in the same process, I get values ​​like 1003, 1103 and 1403. Here is "Hello, World!". output or NSLog () for reference:

2009-09-15 10:26:38.591 delme[38163:10b] Hello, World!

Answer 1

Stream identifier; in particular, its thread identifier. You can get it yourself:

pthread_mach_thread_np(pthread_self())

Answer 2

IIRC, this is a stream identifier.