[][src]Struct crossbeam_utils::sync::WaitGroup

pub struct WaitGroup { /* fields omitted */ }

Enables threads to synchronize the beginning or end of some computation.

Wait groups vs barriers

WaitGroup is very similar to Barrier, but there are a few differences:

  • Barrier needs to know the number of threads at construction, while WaitGroup is cloned to register more threads.

  • A Barrier can be reused even after all threads have synchronized, while a WaitGroup synchronizes threads only once.

  • All threads wait for others to reach the Barrier. With WaitGroup, each thread can choose to either wait for other threads or to continue without blocking.

Examples

use crossbeam_utils::sync::WaitGroup;
use std::thread;

// Create a new wait group.
let wg = WaitGroup::new();

for _ in 0..4 {
    // Create another reference to the wait group.
    let wg = wg.clone();

    thread::spawn(move || {
        // Do some work.

        // Drop the reference to the wait group.
        drop(wg);
    });
}

// Block until all threads have finished their work.
wg.wait();

Methods

impl WaitGroup[src]

pub fn new() -> WaitGroup[src]

Creates a new wait group and returns the single reference to it.

Examples

use crossbeam_utils::sync::WaitGroup;

let wg = WaitGroup::new();

pub fn wait(self)[src]

Drops this reference and waits until all other references are dropped.

Examples

use crossbeam_utils::sync::WaitGroup;
use std::thread;

let wg = WaitGroup::new();

thread::spawn({
    let wg = wg.clone();
    move || {
        // Block until both threads have reached `wait()`.
        wg.wait();
    }
});

// Block until both threads have reached `wait()`.
wg.wait();

Trait Implementations

impl Clone for WaitGroup[src]

impl Debug for WaitGroup[src]

impl Drop for WaitGroup[src]

Auto Trait Implementations

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.