Barrier in std::sync - Rust (original) (raw)

Struct Barrier

1.0.0 · Source

pub struct Barrier { /* private fields */ }

Expand description

A barrier enables multiple threads to synchronize the beginning of some computation.

§Examples

use std::sync::Barrier;
use std::thread;

let n = 10;
let barrier = Barrier::new(n);
thread::scope(|s| {
    for _ in 0..n {
        // The same messages will be printed together.
        // You will NOT see any interleaving.
        s.spawn(|| {
            println!("before wait");
            barrier.wait();
            println!("after wait");
        });
    }
});

Source§

1.0.0 (const: 1.78.0) · Source

Creates a new barrier that can block a given number of threads.

A barrier will block n-1 threads which call wait() and then wake up all threads at once when the nth thread calls wait().

§Examples

use std::sync::Barrier;

let barrier = Barrier::new(10);

1.0.0 · Source

Blocks the current thread until all threads have rendezvoused here.

Barriers are re-usable after all threads have rendezvoused once, and can be used continuously.

A single (arbitrary) thread will receive a BarrierWaitResult that returns true from BarrierWaitResult::is_leader() when returning from this function, and all other threads will receive a result that will return false from BarrierWaitResult::is_leader().

§Examples

use std::sync::Barrier;
use std::thread;

let n = 10;
let barrier = Barrier::new(n);
thread::scope(|s| {
    for _ in 0..n {
        // The same messages will be printed together.
        // You will NOT see any interleaving.
        s.spawn(|| {
            println!("before wait");
            barrier.wait();
            println!("after wait");
        });
    }
});

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