1 use std::{
2     sync::{Arc, Barrier},
3     thread,
4     time::{Duration, Instant},
5 };
6 use tracing::dispatcher::Dispatch;
7 
8 #[derive(Clone)]
9 pub(super) struct MultithreadedBench {
10     start: Arc<Barrier>,
11     end: Arc<Barrier>,
12     dispatch: Dispatch,
13 }
14 
15 impl MultithreadedBench {
new(dispatch: Dispatch) -> Self16     pub(super) fn new(dispatch: Dispatch) -> Self {
17         Self {
18             start: Arc::new(Barrier::new(5)),
19             end: Arc::new(Barrier::new(5)),
20             dispatch,
21         }
22     }
23 
thread(&self, f: impl FnOnce() + Send + 'static) -> &Self24     pub(super) fn thread(&self, f: impl FnOnce() + Send + 'static) -> &Self {
25         self.thread_with_setup(|start| {
26             start.wait();
27             f()
28         })
29     }
30 
thread_with_setup(&self, f: impl FnOnce(&Barrier) + Send + 'static) -> &Self31     pub(super) fn thread_with_setup(&self, f: impl FnOnce(&Barrier) + Send + 'static) -> &Self {
32         let this = self.clone();
33         thread::spawn(move || {
34             let dispatch = this.dispatch.clone();
35             tracing::dispatcher::with_default(&dispatch, move || {
36                 f(&this.start);
37                 this.end.wait();
38             })
39         });
40         self
41     }
42 
run(&self) -> Duration43     pub(super) fn run(&self) -> Duration {
44         self.start.wait();
45         let t0 = Instant::now();
46         self.end.wait();
47         t0.elapsed()
48     }
49 }
50