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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
use alloc::boxed::FnBox;
use cmp;
use ffi::CStr;
use io;
use libc;
use mem;
use ptr;
use sys::os;
use time::Duration;
use sys_common::thread::*;
pub struct Thread {
id: libc::pthread_t,
}
unsafe impl Send for Thread {}
unsafe impl Sync for Thread {}
#[cfg(not(target_os = "emscripten"))]
unsafe fn pthread_attr_setstacksize(attr: *mut libc::pthread_attr_t,
stack_size: libc::size_t) -> libc::c_int {
libc::pthread_attr_setstacksize(attr, stack_size)
}
#[cfg(target_os = "emscripten")]
unsafe fn pthread_attr_setstacksize(_attr: *mut libc::pthread_attr_t,
_stack_size: libc::size_t) -> libc::c_int {
panic!()
}
impl Thread {
pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>)
-> io::Result<Thread> {
let p = box p;
let mut native: libc::pthread_t = mem::zeroed();
let mut attr: libc::pthread_attr_t = mem::zeroed();
assert_eq!(libc::pthread_attr_init(&mut attr), 0);
let stack_size = cmp::max(stack, min_stack_size(&attr));
match pthread_attr_setstacksize(&mut attr,
stack_size) {
0 => {}
n => {
assert_eq!(n, libc::EINVAL);
let page_size = os::page_size();
let stack_size = (stack_size + page_size - 1) &
(-(page_size as isize - 1) as usize - 1);
assert_eq!(libc::pthread_attr_setstacksize(&mut attr,
stack_size), 0);
}
};
let ret = libc::pthread_create(&mut native, &attr, thread_start,
&*p as *const _ as *mut _);
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
return if ret != 0 {
Err(io::Error::from_raw_os_error(ret))
} else {
mem::forget(p);
Ok(Thread { id: native })
};
extern fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
unsafe { start_thread(main); }
ptr::null_mut()
}
}
pub fn yield_now() {
let ret = unsafe { libc::sched_yield() };
debug_assert_eq!(ret, 0);
}
#[cfg(any(target_os = "linux",
target_os = "android"))]
pub fn set_name(name: &CStr) {
const PR_SET_NAME: libc::c_int = 15;
unsafe {
libc::prctl(PR_SET_NAME, name.as_ptr() as libc::c_ulong, 0, 0, 0);
}
}
#[cfg(any(target_os = "freebsd",
target_os = "dragonfly",
target_os = "bitrig",
target_os = "openbsd"))]
pub fn set_name(name: &CStr) {
unsafe {
libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr());
}
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
pub fn set_name(name: &CStr) {
unsafe {
libc::pthread_setname_np(name.as_ptr());
}
}
#[cfg(target_os = "netbsd")]
pub fn set_name(name: &CStr) {
use ffi::CString;
let cname = CString::new(&b"%s"[..]).unwrap();
unsafe {
libc::pthread_setname_np(libc::pthread_self(), cname.as_ptr(),
name.as_ptr() as *mut libc::c_void);
}
}
#[cfg(any(target_env = "newlib",
target_os = "solaris",
target_os = "haiku",
target_os = "emscripten"))]
pub fn set_name(_name: &CStr) {
}
#[cfg(target_os = "fuchsia")]
pub fn set_name(_name: &CStr) {
}
pub fn sleep(dur: Duration) {
let mut secs = dur.as_secs();
let mut nsecs = dur.subsec_nanos() as libc::c_long;
unsafe {
while secs > 0 || nsecs > 0 {
let mut ts = libc::timespec {
tv_sec: cmp::min(libc::time_t::max_value() as u64, secs) as libc::time_t,
tv_nsec: nsecs,
};
secs -= ts.tv_sec as u64;
if libc::nanosleep(&ts, &mut ts) == -1 {
assert_eq!(os::errno(), libc::EINTR);
secs += ts.tv_sec as u64;
nsecs = ts.tv_nsec;
} else {
nsecs = 0;
}
}
}
}
pub fn join(self) {
unsafe {
let ret = libc::pthread_join(self.id, ptr::null_mut());
mem::forget(self);
assert!(ret == 0,
"failed to join thread: {}", io::Error::from_raw_os_error(ret));
}
}
pub fn id(&self) -> libc::pthread_t { self.id }
pub fn into_id(self) -> libc::pthread_t {
let id = self.id;
mem::forget(self);
id
}
}
impl Drop for Thread {
fn drop(&mut self) {
let ret = unsafe { libc::pthread_detach(self.id) };
debug_assert_eq!(ret, 0);
}
}
#[cfg(all(not(all(target_os = "linux", not(target_env = "musl"))),
not(target_os = "freebsd"),
not(target_os = "macos"),
not(target_os = "bitrig"),
not(all(target_os = "netbsd", not(target_vendor = "rumprun"))),
not(target_os = "openbsd"),
not(target_os = "solaris")))]
#[cfg_attr(test, allow(dead_code))]
pub mod guard {
pub unsafe fn current() -> Option<usize> { None }
pub unsafe fn init() -> Option<usize> { None }
}
#[cfg(any(all(target_os = "linux", not(target_env = "musl")),
target_os = "freebsd",
target_os = "macos",
target_os = "bitrig",
all(target_os = "netbsd", not(target_vendor = "rumprun")),
target_os = "openbsd",
target_os = "solaris"))]
#[cfg_attr(test, allow(dead_code))]
pub mod guard {
use libc;
use libc::mmap;
use libc::{PROT_NONE, MAP_PRIVATE, MAP_ANON, MAP_FAILED, MAP_FIXED};
use sys::os;
#[cfg(any(target_os = "macos",
target_os = "bitrig",
target_os = "openbsd",
target_os = "solaris"))]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
current().map(|s| s as *mut libc::c_void)
}
#[cfg(any(target_os = "android", target_os = "freebsd",
target_os = "linux", target_os = "netbsd"))]
unsafe fn get_stack_start() -> Option<*mut libc::c_void> {
let mut ret = None;
let mut attr: libc::pthread_attr_t = ::mem::zeroed();
assert_eq!(libc::pthread_attr_init(&mut attr), 0);
#[cfg(target_os = "freebsd")]
let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
#[cfg(not(target_os = "freebsd"))]
let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
if e == 0 {
let mut stackaddr = ::ptr::null_mut();
let mut stacksize = 0;
assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
&mut stacksize), 0);
ret = Some(stackaddr);
}
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
ret
}
pub unsafe fn init() -> Option<usize> {
let psize = os::page_size();
let mut stackaddr = match get_stack_start() {
Some(addr) => addr,
None => return None,
};
let remainder = (stackaddr as usize) % psize;
if remainder != 0 {
stackaddr = ((stackaddr as usize) + psize - remainder)
as *mut libc::c_void;
}
if cfg!(target_os = "linux") {
Some(stackaddr as usize)
} else {
let result = mmap(stackaddr, psize, PROT_NONE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0);
if result != stackaddr || result == MAP_FAILED {
panic!("failed to allocate a guard page");
}
let offset = if cfg!(target_os = "freebsd") {
2
} else {
1
};
Some(stackaddr as usize + offset * psize)
}
}
#[cfg(target_os = "solaris")]
pub unsafe fn current() -> Option<usize> {
let mut current_stack: libc::stack_t = ::mem::zeroed();
assert_eq!(libc::stack_getbounds(&mut current_stack), 0);
Some(current_stack.ss_sp as usize)
}
#[cfg(target_os = "macos")]
pub unsafe fn current() -> Option<usize> {
Some((libc::pthread_get_stackaddr_np(libc::pthread_self()) as usize -
libc::pthread_get_stacksize_np(libc::pthread_self())))
}
#[cfg(any(target_os = "openbsd", target_os = "bitrig"))]
pub unsafe fn current() -> Option<usize> {
let mut current_stack: libc::stack_t = ::mem::zeroed();
assert_eq!(libc::pthread_stackseg_np(libc::pthread_self(),
&mut current_stack), 0);
let extra = if cfg!(target_os = "bitrig") {3} else {1} * os::page_size();
Some(if libc::pthread_main_np() == 1 {
current_stack.ss_sp as usize - current_stack.ss_size + extra
} else {
current_stack.ss_sp as usize - current_stack.ss_size
})
}
#[cfg(any(target_os = "android", target_os = "freebsd",
target_os = "linux", target_os = "netbsd"))]
pub unsafe fn current() -> Option<usize> {
let mut ret = None;
let mut attr: libc::pthread_attr_t = ::mem::zeroed();
assert_eq!(libc::pthread_attr_init(&mut attr), 0);
#[cfg(target_os = "freebsd")]
let e = libc::pthread_attr_get_np(libc::pthread_self(), &mut attr);
#[cfg(not(target_os = "freebsd"))]
let e = libc::pthread_getattr_np(libc::pthread_self(), &mut attr);
if e == 0 {
let mut guardsize = 0;
assert_eq!(libc::pthread_attr_getguardsize(&attr, &mut guardsize), 0);
if guardsize == 0 {
panic!("there is no guard page");
}
let mut stackaddr = ::ptr::null_mut();
let mut size = 0;
assert_eq!(libc::pthread_attr_getstack(&attr, &mut stackaddr,
&mut size), 0);
ret = if cfg!(target_os = "freebsd") {
Some(stackaddr as usize - guardsize)
} else if cfg!(target_os = "netbsd") {
Some(stackaddr as usize)
} else {
Some(stackaddr as usize + guardsize)
};
}
assert_eq!(libc::pthread_attr_destroy(&mut attr), 0);
ret
}
}
#[cfg(target_os = "linux")]
#[allow(deprecated)]
fn min_stack_size(attr: *const libc::pthread_attr_t) -> usize {
weak!(fn __pthread_get_minstack(*const libc::pthread_attr_t) -> libc::size_t);
match __pthread_get_minstack.get() {
None => libc::PTHREAD_STACK_MIN,
Some(f) => unsafe { f(attr) },
}
}
#[cfg(all(not(target_os = "linux"),
not(target_os = "netbsd")))]
fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
libc::PTHREAD_STACK_MIN
}
#[cfg(target_os = "netbsd")]
fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
2048
}