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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
use std::{
convert::TryFrom, error::Error, fmt::Debug, marker::PhantomData, ops::Deref, ops::DerefMut,
};
cfg_if::cfg_if! {
if #[cfg(unix)] {
mod unix;
use unix as sh;
} else if #[cfg(windows)] {
mod windows;
use windows as sh;
} else {
panic!("No shared memory model available.");
}
}
type IResult<T> = std::result::Result<T, Box<dyn Error>>;
trait DerefAble<T> {
fn get_t(&self) -> &T;
fn get_t_mut(&mut self) -> &mut T;
}
#[derive(Debug)]
pub struct ShMem<T: Default + Copy> {
map: sh::ShObj<T>,
}
impl<T: Default + Copy> Deref for ShMem<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.map.get_t()
}
}
impl<T: Default + Copy> DerefMut for ShMem<T> {
fn deref_mut(&mut self) -> &mut Self::Target {
self.map.get_t_mut()
}
}
#[derive(Debug)]
pub struct ShMemCfg<T: Default + Copy> {
file_name: String,
owner: bool,
_marker: PhantomData<T>,
}
impl<T: Default + Copy> Default for ShMemCfg<T> {
fn default() -> Self {
let mut seed = [0_u8; 8];
getrandom::getrandom(&mut seed).expect("Error on getrandom!");
let mut rnd = oorandom::Rand32::new(u64::from_ne_bytes(seed));
cfg_if::cfg_if! {
if #[cfg(unix)] {
let name = format!("/shmem_{}", rnd.rand_u32());
} else if #[cfg(windows)] {
let name = format!("Global\\{}", rnd.rand_u32());
} else {
let name = String::new();
panic!();
}
};
Self {
file_name: name.to_string(),
owner: false,
_marker: PhantomData,
}
}
}
impl<T: Default + Copy> ShMemCfg<T> {
pub fn owner(&mut self) -> &mut Self {
self.owner = true;
self
}
pub fn on_file(&mut self, name: String) -> &mut Self {
cfg_if::cfg_if! {
if #[cfg(unix)] {
let p_name = format!("/shmem_{}", name);
} else if #[cfg(windows)] {
let p_name = format!("Global\\{}", name);
} else {
let p_name = String::new();
panic!();
}
};
self.file_name = p_name;
self
}
pub fn build(&mut self) -> Result<ShMem<T>, Box<dyn Error>> {
let obj = sh::ShObj::try_from(self)?;
Ok(ShMem { map: obj })
}
}