Struct ScopedJoinHandle

pub struct ScopedJoinHandle<'scope, T>(/* private fields */);

An owned permission to join on a scoped thread (block on its termination).

See Scope::spawn for details.

Implementations

impl<'scope, T> ScopedJoinHandle<'scope, T>

pub fn thread(&self) -> &Thread

Extracts a handle to the underlying thread.

Examples

use std::thread;

thread::scope(|s| {
    let t = s.spawn(|| {
        println!("hello");
    });
    println!("thread id: {:?}", t.thread().id());
});

pub fn join(self) -> Result<T, Box<dyn Any + Send>>

Waits for the associated thread to finish.

This function will return immediately if the associated thread has already finished.

In terms of atomic memory orderings, the completion of the associated thread synchronizes with this function returning. In other words, all operations performed by that thread happen before all operations that happen after join returns.

If the associated thread panics, Err is returned with the panic payload.

Examples

use std::thread;

thread::scope(|s| {
    let t = s.spawn(|| {
        panic!("oh no");
    });
    assert!(t.join().is_err());
});

pub fn is_finished(&self) -> bool

Checks if the associated thread has finished running its main function.

is_finished supports implementing a non-blocking join operation, by checking is_finished, and calling join if it returns true. This function does not block. To block while waiting on the thread to finish, use join.

This might return true for a brief moment after the thread’s main function has returned, but before the thread itself has stopped running. However, once this returns true, join can be expected to return quickly, without blocking for any significant amount of time.

Trait Implementations

impl<'scope, T> Debug for ScopedJoinHandle<'scope, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.