Method promote

src/thread_pool.rs:1246–1257

(&self)

/// Every thread has at most one worker at a time. If a worker has already been
/// set up, it may be accessed at any time by calling [`Worker::with_current`].
/// A thread's worker can also be manually set up by claiming a membership
/// ([`ThreadPool::try_enroll`]) and passing it to [`Membership::activate`]. The
/// worker returned by `with_current` always represents the membership most
/// recently activated in the call stack.
///
/// Every worker belongs to exactly one thread pool, and must hold a membership
/// in one of the shared slots within that pool.
///
/// Workers have one core memory-safety guarantee: Any jobs added to the worker
/// will eventually be executed.
pub struct Worker {
    /// Registers the worker as belonging to a specific thread pool, and
    /// potentially also grants "membership" on that thread-pool.
    pub(crate) membership: Membership,
    /// A sequence of jobs waiting to be executed. Newer jobs are executed