Threads id

[Tonaion02]

` rayon::ThreadPoolBuilder::new().
num_threads(*NUM_THREADS).
start_handler(|real_thread_id| {

    println!("Thread id {real_thread_id}");

}).
build_global().
unwrap();`

I noticed that the thread ids passed to start_handler are sequential (0, 1, 2, 3....) and starts from zero.
Is this something casual or is something standard?

[cuviper]

The parameter is documented as a thread index, and that's specific to the pool, so yes it will be 0..num_threads. Note that start handlers will be invoked in parallel though, so you might not "see" them sequentially in a global sense.

It will not have any correlation to std::thread::current().id() or the operating system gettid, etc.