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
86
87
88
|
//! Implementation of an atomic u64 cell. On 64 bit platforms, this is a wrapper
//! around `AtomicUsize`. On 32 bit platforms, this is implemented using a
//! `Mutex`.
//!
//! This file can be removed if/when `AtomicU64` lands in `std`.
pub use self::imp::AtomicU64;
#[cfg(target_pointer_width = "64")]
mod imp {
use std::sync::atomic::{AtomicUsize, Ordering};
#[derive(Debug)]
pub struct AtomicU64 {
inner: AtomicUsize,
}
impl AtomicU64 {
pub fn new(val: u64) -> AtomicU64 {
AtomicU64 {
inner: AtomicUsize::new(val as usize),
}
}
pub fn load(&self, ordering: Ordering) -> u64 {
self.inner.load(ordering) as u64
}
pub fn store(&self, val: u64, ordering: Ordering) {
self.inner.store(val as usize, ordering)
}
pub fn fetch_or(&self, val: u64, ordering: Ordering) -> u64 {
self.inner.fetch_or(val as usize, ordering) as u64
}
pub fn compare_and_swap(&self, old: u64, new: u64, ordering: Ordering) -> u64 {
self.inner.compare_and_swap(
old as usize, new as usize, ordering) as u64
}
}
}
#[cfg(not(target_pointer_width = "64"))]
mod imp {
use std::sync::Mutex;
use std::sync::atomic::Ordering;
#[derive(Debug)]
pub struct AtomicU64 {
inner: Mutex<u64>,
}
impl AtomicU64 {
pub fn new(val: u64) -> AtomicU64 {
AtomicU64 {
inner: Mutex::new(val),
}
}
pub fn load(&self, _: Ordering) -> u64 {
*self.inner.lock().unwrap()
}
pub fn store(&self, val: u64, _: Ordering) {
*self.inner.lock().unwrap() = val;
}
pub fn fetch_or(&self, val: u64, _: Ordering) -> u64 {
let mut lock = self.inner.lock().unwrap();
let prev = *lock;
*lock = prev | val;
prev
}
pub fn compare_and_swap(&self, old: u64, new: u64, _: Ordering) -> u64 {
let mut lock = self.inner.lock().unwrap();
let prev = *lock;
if prev != old {
return prev;
}
*lock = new;
prev
}
}
}
|
