bp3d_threads/thread_pool/
unscoped.rs

1// Copyright (c) 2021, BlockProject 3D
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28
29use crate::thread_pool::core::ThreadManager;
30use crate::Join;
31use std::thread::JoinHandle;
32
33impl Join for JoinHandle<()> {
34    fn join(self) -> std::thread::Result<()> {
35        self.join()
36    }
37}
38
39/// Represents an UnscopedThreadManager (using low level std::thread::spawn).
40pub struct UnscopedThreadManager();
41
42impl Default for UnscopedThreadManager {
43    fn default() -> Self {
44        Self::new()
45    }
46}
47
48impl UnscopedThreadManager {
49    /// Creates new UnscopedThreadManager.
50    ///
51    /// # Examples
52    ///
53    /// ```
54    /// use bp3d_threads::ThreadPool;
55    /// use bp3d_threads::UnscopedThreadManager;
56    /// let manager = UnscopedThreadManager::new();
57    /// let mut pool: ThreadPool<UnscopedThreadManager, i32> = ThreadPool::new(4);
58    /// assert!(pool.is_idle());
59    /// pool.send(&manager, |_| 12);
60    /// assert!(!pool.is_idle());
61    /// pool.wait().unwrap();
62    /// assert!(pool.is_idle());
63    /// ```
64    pub fn new() -> Self {
65        Self()
66    }
67}
68
69impl ThreadManager<'static> for UnscopedThreadManager {
70    type Handle = JoinHandle<()>;
71
72    fn spawn_thread<F: FnOnce() + Send + 'static>(&self, func: F) -> Self::Handle {
73        std::thread::spawn(func)
74    }
75}
76
77#[cfg(test)]
78mod tests {
79    use crate::thread_pool::{ThreadPool, UnscopedThreadManager};
80
81    fn fibonacci_recursive(n: usize) -> usize {
82        if n == 0 {
83            0
84        } else if n == 1 {
85            1
86        } else {
87            fibonacci_recursive(n - 1) + fibonacci_recursive(n - 2)
88        }
89    }
90
91    #[test]
92    fn basic() {
93        const N: usize = 50;
94        let manager = UnscopedThreadManager::new();
95        let mut pool: ThreadPool<UnscopedThreadManager, usize> = ThreadPool::new(4);
96        for _ in 0..N {
97            pool.send(&manager, |_| fibonacci_recursive(20));
98        }
99        assert!(!pool.is_idle());
100        pool.wait().unwrap();
101        assert!(pool.is_idle());
102        let mut tasks = 0;
103        while let Some(event) = pool.poll() {
104            assert_eq!(event, 6765);
105            tasks += 1;
106        }
107        assert_eq!(tasks, N);
108    }
109
110    #[test]
111    fn reduce() {
112        const N: usize = 50;
113        let manager = UnscopedThreadManager::new();
114        let mut pool: ThreadPool<UnscopedThreadManager, usize> = ThreadPool::new(4);
115        for _ in 0..N {
116            pool.send(&manager, |_| fibonacci_recursive(20));
117        }
118        assert!(!pool.is_idle());
119        let tasks = pool.reduce().count();
120        assert_eq!(tasks, N);
121        assert!(pool.is_idle());
122    }
123}
bp3d_threads/thread_pool/unscoped.rs

bp3d_threads/thread_pool/
unscoped.rs
