pub fn current_thread_index() -> Option<usize>Expand description
If called from a Rayon worker thread, returns the index of that
thread within its current pool; if not called from a Rayon thread,
returns None.
The index for a given thread will not change over the thread’s lifetime. However, multiple threads may share the same index if they are in distinct thread-pools.
See also: [the ThreadPool::current_thread_index() method].
§Future compatibility note
Currently, every thread-pool (including the global
thread-pool) has a fixed number of threads, but this may
change in future Rayon versions (see the num_threads() method
for details). In that case, the index for a
thread would not change during its lifetime, but thread
indices may wind up being reused if threads are terminated and
restarted.