Crate concurrent_pool 

A concurrent object pool.

Features

• Configurable capacity and preallocation.
• Thread-safe: Multiple threads can pull and recycle items concurrently.
• Automatic reclamation of unused item when the continuous occurrence of surplus-pull reaches a certain threshold if auto_reclaim is enabled.

surplus-pull

After pulling data from the memory pool, available allocated entities in the memory pool are exceed a certain threshold. We call this pull is a surplus-pull.

Examples

Local memory pool

use concurrent_pool::Pool;

let pool: Pool<u32> = Pool::with_capacity(10);
assert_eq!(pool.available(), 10);
let item = pool.pull().unwrap();
assert_eq!(*item, 0);
assert_eq!(pool.available(), 9);
let item_clone = item.clone();
drop(item);
assert_eq!(pool.available(), 9);
drop(item_clone);
assert_eq!(pool.available(), 10);

Multiple threads shared memory pool

use concurrent_pool::Pool;
use std::sync::{Arc, mpsc};

let pool: Arc<Pool<u32>> = Arc::new(Pool::with_capacity(10));

let (tx, rx) = mpsc::channel();
let clone_pool = pool.clone();
let tx1 = tx.clone();
let sender1 = std::thread::spawn(move || {
    let item = clone_pool.pull_owned_with(|x| *x = 1).unwrap();
    tx1.send((1, item)).unwrap();
});

let clone_pool = pool.clone();
let sender2 = std::thread::spawn(move || {
    let item = clone_pool.pull_owned_with(|x| *x = 2).unwrap();
    tx.send((2, item)).unwrap();
});

let receiver = std::thread::spawn(move || {
    for _ in 0..2 {
        let (id, item) = rx.recv().unwrap();
        if id == 1 {
            assert_eq!(*item, 1);
        } else {
            assert_eq!(*item, 2);
        }
    }
});

sender1.join().unwrap();
sender2.join().unwrap();
receiver.join().unwrap();

Structs

Builder

A builder for creating a Pool with custom configuration.

Config

Configuration for the pool.

Entry

An entry in the pool.

OwnedEntry

An owned entry in the pool.

Pool

A concurrent object pool.