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
#![cfg_attr(feature = "use_std", allow(dead_code))]
use core::marker;
use core::mem;
use core::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT};
use core::sync::atomic::Ordering::{SeqCst, Relaxed};
use super::{BorrowedTask, NotifyHandle};
pub struct LocalKey;
pub struct LocalMap;
pub fn local_map() -> LocalMap { LocalMap }
#[derive(Copy, Clone)]
pub struct BorrowedEvents<'a>(marker::PhantomData<&'a ()>);
#[derive(Copy, Clone)]
pub struct BorrowedUnpark<'a> {
f: &'a Fn() -> NotifyHandle,
id: usize,
}
pub struct TaskUnpark {
handle: NotifyHandle,
id: usize,
}
#[derive(Clone)]
pub struct UnparkEvents;
impl<'a> BorrowedEvents<'a> {
pub fn new() -> BorrowedEvents<'a> {
BorrowedEvents(marker::PhantomData)
}
pub fn to_owned(&self) -> UnparkEvents {
UnparkEvents
}
}
impl<'a> BorrowedUnpark<'a> {
#[inline]
pub fn new(f: &'a Fn() -> NotifyHandle, id: usize) -> BorrowedUnpark<'a> {
BorrowedUnpark { f: f, id: id }
}
#[inline]
pub fn to_owned(&self) -> TaskUnpark {
let handle = (self.f)();
let id = handle.clone_id(self.id);
TaskUnpark { handle: handle, id: id }
}
}
impl UnparkEvents {
pub fn notify(&self) {}
pub fn will_notify(&self, _other: &BorrowedEvents) -> bool {
true
}
}
impl TaskUnpark {
pub fn notify(&self) {
self.handle.notify(self.id);
}
pub fn will_notify(&self, other: &BorrowedUnpark) -> bool {
self.id == other.id && self.handle.inner == (other.f)().inner
}
}
impl Clone for TaskUnpark {
fn clone(&self) -> TaskUnpark {
let handle = self.handle.clone();
let id = handle.clone_id(self.id);
TaskUnpark { handle: handle, id: id }
}
}
impl Drop for TaskUnpark {
fn drop(&mut self) {
self.handle.drop_id(self.id);
}
}
static GET: AtomicUsize = ATOMIC_USIZE_INIT;
static SET: AtomicUsize = ATOMIC_USIZE_INIT;
pub unsafe fn init(get: fn() -> *mut u8, set: fn(*mut u8)) -> bool {
if GET.compare_exchange(0, get as usize, SeqCst, SeqCst).is_ok() {
SET.store(set as usize, SeqCst);
true
} else {
false
}
}
#[inline]
pub fn get_ptr() -> *mut u8 {
match GET.load(Relaxed) {
0 => panic!("not initialized"),
n => unsafe { mem::transmute::<usize, fn() -> *mut u8>(n)() },
}
}
#[cfg(feature = "use_std")]
#[inline]
pub fn is_get_ptr(f: usize) -> bool {
GET.load(Relaxed) == f
}
pub fn set<'a, F, R>(task: &BorrowedTask<'a>, f: F) -> R
where F: FnOnce() -> R
{
let set = match SET.load(Relaxed) {
0 => panic!("not initialized"),
n => unsafe { mem::transmute::<usize, fn(*mut u8)>(n) },
};
struct Reset(fn(*mut u8), *mut u8);
impl Drop for Reset {
#[inline]
fn drop(&mut self) {
(self.0)(self.1);
}
}
let _reset = Reset(set, get_ptr());
set(task as *const _ as *mut u8);
f()
}