wpool

A thread pool that limits the number of tasks executing concurrently, without restricting how many tasks can be queued. Submitting tasks is non-blocking, so you can enqueue any number of tasks without waiting.

This library is essentially a port of workerpool, an amazing Go library.

Pool with only worker maximum

// At most 10 workers can run at once.
let max_workers = 10;

let pool = WPool::new(max_workers);

// Submit as many functions as you'd like.
pool.submit(|| {
  // Do some work.
});
pool.submit(|| {
  // Do more work.
});

// Block until all workers are done working and
// the waiting queue has been processed.
pool.stop_wait();

Pool with both worker maximum and worker minimum

min_workers defines (up to) the minimum number of worker threads that should always stay alive, even when the pool is idle.

NOTE: We do not 'pre-spawn' workers! Meaning, if you set min_workers = 3 but your pool only ever creates 2 workers, then only 2 workers will ever exist (and should always be alive).

// At most 10 workers can run at once.
let max_workers = 10;
// At minimum up to 3 workers should always exist.
let min_workers = 3;

let pool = WPool::new_with_min(max_workers, min_workers);

// Submit as many functions as you'd like.
pool.submit(|| {
  // Do some work.
});
pool.submit(|| {
  // Do more work.
});

// Block until all workers are done working and
// the waiting queue has been processed.
pool.stop_wait();