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
#![cfg(target_thread_local)]
#![unstable(feature = "thread_local_internals", issue = "none")]
#[cfg(any(
target_os = "linux",
target_os = "fuchsia",
target_os = "redox",
target_os = "emscripten"
))]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
use crate::mem;
use crate::sys_common::thread_local_dtor::register_dtor_fallback;
extern "C" {
#[linkage = "extern_weak"]
static __dso_handle: *mut u8;
#[linkage = "extern_weak"]
static __cxa_thread_atexit_impl: *const libc::c_void;
}
if !__cxa_thread_atexit_impl.is_null() {
type F = unsafe extern "C" fn(
dtor: unsafe extern "C" fn(*mut u8),
arg: *mut u8,
dso_handle: *mut u8,
) -> libc::c_int;
mem::transmute::<*const libc::c_void, F>(__cxa_thread_atexit_impl)(
dtor,
t,
&__dso_handle as *const _ as *mut _,
);
return;
}
register_dtor_fallback(t, dtor);
}
#[cfg(target_os = "macos")]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
use crate::cell::Cell;
use crate::ptr;
#[thread_local]
static REGISTERED: Cell<bool> = Cell::new(false);
if !REGISTERED.get() {
_tlv_atexit(run_dtors, ptr::null_mut());
REGISTERED.set(true);
}
type List = Vec<(*mut u8, unsafe extern "C" fn(*mut u8))>;
#[thread_local]
static DTORS: Cell<*mut List> = Cell::new(ptr::null_mut());
if DTORS.get().is_null() {
let v: Box<List> = box Vec::new();
DTORS.set(Box::into_raw(v));
}
extern "C" {
fn _tlv_atexit(dtor: unsafe extern "C" fn(*mut u8), arg: *mut u8);
}
let list: &mut List = &mut *DTORS.get();
list.push((t, dtor));
unsafe extern "C" fn run_dtors(_: *mut u8) {
let mut ptr = DTORS.replace(ptr::null_mut());
while !ptr.is_null() {
let list = Box::from_raw(ptr);
for (ptr, dtor) in list.into_iter() {
dtor(ptr);
}
ptr = DTORS.replace(ptr::null_mut());
}
}
}
#[cfg(target_os = "vxworks")]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
use crate::sys_common::thread_local_dtor::register_dtor_fallback;
register_dtor_fallback(t, dtor);
}