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
use alloc::boxed::Box;
use errno::*;
use synch::spinlock::*;
pub struct SpinlockContainer<'a> {
lock: Spinlock<()>,
guard: Option<SpinlockGuard<'a, ()>>,
}
pub struct SpinlockIrqSaveContainer<'a> {
lock: SpinlockIrqSave<()>,
guard: Option<SpinlockIrqSaveGuard<'a, ()>>,
}
#[no_mangle]
pub extern "C" fn sys_spinlock_init(lock: *mut *mut SpinlockContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
let boxed_container = Box::new(SpinlockContainer {
lock: Spinlock::new(()),
guard: None,
});
unsafe {
*lock = Box::into_raw(boxed_container);
}
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_destroy(lock: *mut SpinlockContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
unsafe {
Box::from_raw(lock);
}
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_lock(lock: *mut SpinlockContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
let container = unsafe { &mut *lock };
assert!(
container.guard.is_none(),
"Called sys_spinlock_lock when a lock is already held!"
);
container.guard = Some(container.lock.lock());
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_unlock(lock: *mut SpinlockContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
let container = unsafe { &mut *lock };
assert!(
container.guard.is_some(),
"Called sys_spinlock_unlock when no lock is currently held!"
);
container.guard = None;
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_irqsave_init(lock: *mut *mut SpinlockIrqSaveContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
let boxed_container = Box::new(SpinlockIrqSaveContainer {
lock: SpinlockIrqSave::new(()),
guard: None,
});
unsafe {
*lock = Box::into_raw(boxed_container);
}
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_irqsave_destroy(lock: *mut SpinlockIrqSaveContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
unsafe {
Box::from_raw(lock);
}
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_irqsave_lock(lock: *mut SpinlockIrqSaveContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
let container = unsafe { &mut *lock };
assert!(
container.guard.is_none(),
"Called sys_spinlock_irqsave_lock when a lock is already held!"
);
container.guard = Some(container.lock.lock());
0
}
#[no_mangle]
pub extern "C" fn sys_spinlock_irqsave_unlock(lock: *mut SpinlockIrqSaveContainer) -> i32 {
if lock.is_null() {
return -EINVAL;
}
let container = unsafe { &mut *lock };
assert!(
container.guard.is_some(),
"Called sys_spinlock_irqsave_unlock when no lock is currently held!"
);
container.guard = None;
0
}