Method signal_random

src/thread_pool.rs:1333–1345

(&self, sleeping: u32)

            // allocated within its own stack frame. Before it returns,
            // `activate` restores the previous value of `WORKER_PTR` (and it
            // aborts on panic, so this reset is guaranteed to occur). So the
            // `WORKER_PTR` is either null or a pointer to a live, immovable
            // `Worker`.
            //
            // If the pointer is non-null, it is therefore sound to dereference
            // as a shared reference. Forming a `'static` reference is avoided
            // by passing the value into a closure, which bounds the reference's
            // lifetime to the closure body and prevents callers from retaining
            // it past the point where `activate` returns and the `Worker` is
            // freed.
            Some(f(unsafe { &*worker_ptr }))
        } else {
            None
        }
    }