Function spawn_broadcast 

pub fn spawn_broadcast<OP>(op: OP)
where
    OP: Fn(BroadcastContext<'_>) + Send + Sync + 'static,

Available on crate feature rayon only.

Spawns an asynchronous task on every thread in this thread pool. This task will run in the implicit, global scope, which means that it may outlast the current stack frame – therefore, it cannot capture any references onto the stack (you will likely need a move closure).

For more information, see the ThreadPool::spawn_broadcast() method.