shared_arena 0.8.4

A thread-safe & efficient memory pool
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85


#[cfg_attr(
    any(
        target_arch = "mips",
        target_arch = "arm",
        target_arch = "aarch64",
        target_arch = "mips64",
        target_arch = "mips64el"
    ),
    repr(align(32))
)]
#[cfg_attr(
    any(
        target_arch = "x86",
        target_arch = "powerpc",
// https://community.arm.com/developer/ip-products/processors/f/cortex-a-forum/13570/cortex-a7-cache-line-size
        target_arch = "armv7",
        target_arch = "armv7r",
    ),
    repr(align(64))
)]
#[cfg_attr(
    any(
        target_arch = "x86_64",
        target_arch = "powerpc64",
    ),
    repr(align(128))
)]
#[cfg_attr(any(target_arch = "s390x"), repr(align(256)))]
#[cfg_attr(any(target_arch = "wasm32"), repr(align(0)))]
#[derive(Debug)]
pub struct CacheAligned<T: Sized>(T);

impl<T> CacheAligned<T> {
    #[allow(dead_code)]
    pub fn new(v: T) -> CacheAligned<T> {
        CacheAligned(v)
    }
}

impl<T: Copy + Clone> Copy for CacheAligned<T> {}

impl<T: Clone> Clone for CacheAligned<T> {
    fn clone(&self) -> CacheAligned<T> {
        CacheAligned(self.0.clone())
    }
}

impl<T: Sized> std::ops::Deref for CacheAligned<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T: Sized> std::ops::DerefMut for CacheAligned<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

#[cfg(test)]
mod tests {
    use super::CacheAligned;

    #[test]
    fn test_cached_aligned() {
        let var = CacheAligned::new(1);
        assert!(*var == 1);
    }

    #[test]
    fn test_cached_aligned_mut() {
        let mut var = CacheAligned::new(1);
        *var += 1;
        assert!(*var == 2);
    }

    #[test]
    fn test_cached_aligned_clone() {
        let var = CacheAligned::new(10);
        assert!(*var == 10 && *var.clone() == 10);
    }
}