5 use std::convert::{From, TryInto};
8 use std::option::Option::{self, None, Some};
9 use std::sync::atomic::{
11 Ordering::{Acquire, SeqCst},
13 use std::sync::mpsc::channel;
19 struct Canary(*mut atomic::AtomicUsize);
21 impl Drop for Canary {
26 (*c).fetch_add(1, SeqCst);
34 #[cfg_attr(target_os = "emscripten", ignore)]
35 fn manually_share_arc() {
36 let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
37 let arc_v = Arc::new(v);
39 let (tx, rx) = channel();
41 let _t = thread::spawn(move || {
42 let arc_v: Arc<Vec<i32>> = rx.recv().unwrap();
43 assert_eq!((*arc_v)[3], 4);
46 tx.send(arc_v.clone()).unwrap();
48 assert_eq!((*arc_v)[2], 3);
49 assert_eq!((*arc_v)[4], 5);
53 fn test_arc_get_mut() {
54 let mut x = Arc::new(3);
55 *Arc::get_mut(&mut x).unwrap() = 4;
58 assert!(Arc::get_mut(&mut x).is_none());
60 assert!(Arc::get_mut(&mut x).is_some());
61 let _w = Arc::downgrade(&x);
62 assert!(Arc::get_mut(&mut x).is_none());
67 assert_eq!(Weak::weak_count(&Weak::<u64>::new()), 0);
68 assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
71 let w = Arc::downgrade(&a);
72 assert_eq!(Weak::strong_count(&w), 1);
73 assert_eq!(Weak::weak_count(&w), 1);
75 assert_eq!(Weak::strong_count(&w), 1);
76 assert_eq!(Weak::weak_count(&w), 2);
77 assert_eq!(Weak::strong_count(&w2), 1);
78 assert_eq!(Weak::weak_count(&w2), 2);
80 assert_eq!(Weak::strong_count(&w2), 1);
81 assert_eq!(Weak::weak_count(&w2), 1);
83 assert_eq!(Weak::strong_count(&w2), 2);
84 assert_eq!(Weak::weak_count(&w2), 1);
87 assert_eq!(Weak::strong_count(&w2), 0);
88 assert_eq!(Weak::weak_count(&w2), 0);
95 assert_eq!(Arc::try_unwrap(x), Ok(3));
98 assert_eq!(Arc::try_unwrap(x), Err(Arc::new(4)));
100 let _w = Arc::downgrade(&x);
101 assert_eq!(Arc::try_unwrap(x), Ok(5));
106 let x = Arc::new(box "hello");
109 let x_ptr = Arc::into_raw(x);
112 assert_eq!(**x_ptr, "hello");
114 let x = Arc::from_raw(x_ptr);
115 assert_eq!(**x, "hello");
117 assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
122 fn test_into_from_raw_unsized() {
123 use std::fmt::Display;
124 use std::string::ToString;
126 let arc: Arc<str> = Arc::from("foo");
128 let ptr = Arc::into_raw(arc.clone());
129 let arc2 = unsafe { Arc::from_raw(ptr) };
131 assert_eq!(unsafe { &*ptr }, "foo");
132 assert_eq!(arc, arc2);
134 let arc: Arc<dyn Display> = Arc::new(123);
136 let ptr = Arc::into_raw(arc.clone());
137 let arc2 = unsafe { Arc::from_raw(ptr) };
139 assert_eq!(unsafe { &*ptr }.to_string(), "123");
140 assert_eq!(arc2.to_string(), "123");
144 fn test_cowarc_clone_make_mut() {
145 let mut cow0 = Arc::new(75);
146 let mut cow1 = cow0.clone();
147 let mut cow2 = cow1.clone();
149 assert!(75 == *Arc::make_mut(&mut cow0));
150 assert!(75 == *Arc::make_mut(&mut cow1));
151 assert!(75 == *Arc::make_mut(&mut cow2));
153 *Arc::make_mut(&mut cow0) += 1;
154 *Arc::make_mut(&mut cow1) += 2;
155 *Arc::make_mut(&mut cow2) += 3;
157 assert!(76 == *cow0);
158 assert!(77 == *cow1);
159 assert!(78 == *cow2);
161 // none should point to the same backing memory
162 assert!(*cow0 != *cow1);
163 assert!(*cow0 != *cow2);
164 assert!(*cow1 != *cow2);
168 fn test_cowarc_clone_unique2() {
169 let mut cow0 = Arc::new(75);
170 let cow1 = cow0.clone();
171 let cow2 = cow1.clone();
173 assert!(75 == *cow0);
174 assert!(75 == *cow1);
175 assert!(75 == *cow2);
177 *Arc::make_mut(&mut cow0) += 1;
178 assert!(76 == *cow0);
179 assert!(75 == *cow1);
180 assert!(75 == *cow2);
182 // cow1 and cow2 should share the same contents
183 // cow0 should have a unique reference
184 assert!(*cow0 != *cow1);
185 assert!(*cow0 != *cow2);
186 assert!(*cow1 == *cow2);
190 fn test_cowarc_clone_weak() {
191 let mut cow0 = Arc::new(75);
192 let cow1_weak = Arc::downgrade(&cow0);
194 assert!(75 == *cow0);
195 assert!(75 == *cow1_weak.upgrade().unwrap());
197 *Arc::make_mut(&mut cow0) += 1;
199 assert!(76 == *cow0);
200 assert!(cow1_weak.upgrade().is_none());
206 let y = Arc::downgrade(&x);
207 assert!(y.upgrade().is_some());
213 let y = Arc::downgrade(&x);
215 assert!(y.upgrade().is_none());
219 fn weak_self_cyclic() {
221 x: Mutex<Option<Weak<Cycle>>>,
224 let a = Arc::new(Cycle { x: Mutex::new(None) });
225 let b = Arc::downgrade(&a.clone());
226 *a.x.lock().unwrap() = Some(b);
228 // hopefully we don't double-free (or leak)...
233 let mut canary = atomic::AtomicUsize::new(0);
234 let x = Arc::new(Canary(&mut canary as *mut atomic::AtomicUsize));
236 assert!(canary.load(Acquire) == 1);
241 let mut canary = atomic::AtomicUsize::new(0);
242 let arc = Arc::new(Canary(&mut canary as *mut atomic::AtomicUsize));
243 let arc_weak = Arc::downgrade(&arc);
244 assert!(canary.load(Acquire) == 0);
246 assert!(canary.load(Acquire) == 1);
251 fn test_strong_count() {
253 assert!(Arc::strong_count(&a) == 1);
254 let w = Arc::downgrade(&a);
255 assert!(Arc::strong_count(&a) == 1);
256 let b = w.upgrade().expect("");
257 assert!(Arc::strong_count(&b) == 2);
258 assert!(Arc::strong_count(&a) == 2);
261 assert!(Arc::strong_count(&b) == 1);
263 assert!(Arc::strong_count(&b) == 2);
264 assert!(Arc::strong_count(&c) == 2);
268 fn test_weak_count() {
270 assert!(Arc::strong_count(&a) == 1);
271 assert!(Arc::weak_count(&a) == 0);
272 let w = Arc::downgrade(&a);
273 assert!(Arc::strong_count(&a) == 1);
274 assert!(Arc::weak_count(&a) == 1);
276 assert!(Arc::weak_count(&a) == 2);
279 assert!(Arc::strong_count(&a) == 1);
280 assert!(Arc::weak_count(&a) == 0);
282 assert!(Arc::strong_count(&a) == 2);
283 assert!(Arc::weak_count(&a) == 0);
284 let d = Arc::downgrade(&c);
285 assert!(Arc::weak_count(&c) == 1);
286 assert!(Arc::strong_count(&c) == 2);
296 assert_eq!(format!("{:?}", a), "5");
299 // Make sure deriving works with Arc<T>
300 #[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
307 let x: Arc<[i32]> = Arc::new([1, 2, 3]);
308 assert_eq!(format!("{:?}", x), "[1, 2, 3]");
309 let y = Arc::downgrade(&x.clone());
311 assert!(y.upgrade().is_none());
315 fn test_from_owned() {
317 let foo_arc = Arc::from(foo);
318 assert!(123 == *foo_arc);
323 let foo: Weak<usize> = Weak::new();
324 assert!(foo.upgrade().is_none());
329 let five = Arc::new(5);
330 let same_five = five.clone();
331 let other_five = Arc::new(5);
333 assert!(Arc::ptr_eq(&five, &same_five));
334 assert!(!Arc::ptr_eq(&five, &other_five));
338 #[cfg_attr(target_os = "emscripten", ignore)]
339 fn test_weak_count_locked() {
340 let mut a = Arc::new(atomic::AtomicBool::new(false));
342 let t = thread::spawn(move || {
344 let count = if cfg!(miri) { 1000 } else { 1000000 };
346 Arc::get_mut(&mut a);
348 a.store(true, SeqCst);
351 while !a2.load(SeqCst) {
352 let n = Arc::weak_count(&a2);
353 assert!(n < 2, "bad weak count: {}", n);
354 #[cfg(miri)] // Miri's scheduler does not guarantee liveness, and thus needs this hint.
355 atomic::spin_loop_hint();
362 let r: Arc<str> = Arc::from("foo");
364 assert_eq!(&r[..], "foo");
368 fn test_copy_from_slice() {
369 let s: &[u32] = &[1, 2, 3];
370 let r: Arc<[u32]> = Arc::from(s);
372 assert_eq!(&r[..], [1, 2, 3]);
376 fn test_clone_from_slice() {
377 #[derive(Clone, Debug, Eq, PartialEq)]
380 let s: &[X] = &[X(1), X(2), X(3)];
381 let r: Arc<[X]> = Arc::from(s);
383 assert_eq!(&r[..], s);
388 fn test_clone_from_slice_panic() {
389 use std::string::{String, ToString};
391 struct Fail(u32, String);
393 impl Clone for Fail {
394 fn clone(&self) -> Fail {
398 Fail(self.0, self.1.clone())
403 &[Fail(0, "foo".to_string()), Fail(1, "bar".to_string()), Fail(2, "baz".to_string())];
405 // Should panic, but not cause memory corruption
406 let _r: Arc<[Fail]> = Arc::from(s);
411 let b: Box<u32> = box 123;
412 let r: Arc<u32> = Arc::from(b);
418 fn test_from_box_str() {
419 use std::string::String;
421 let s = String::from("foo").into_boxed_str();
422 let r: Arc<str> = Arc::from(s);
424 assert_eq!(&r[..], "foo");
428 fn test_from_box_slice() {
429 let s = vec![1, 2, 3].into_boxed_slice();
430 let r: Arc<[u32]> = Arc::from(s);
432 assert_eq!(&r[..], [1, 2, 3]);
436 fn test_from_box_trait() {
437 use std::fmt::Display;
438 use std::string::ToString;
440 let b: Box<dyn Display> = box 123;
441 let r: Arc<dyn Display> = Arc::from(b);
443 assert_eq!(r.to_string(), "123");
447 fn test_from_box_trait_zero_sized() {
450 let b: Box<dyn Debug> = box ();
451 let r: Arc<dyn Debug> = Arc::from(b);
453 assert_eq!(format!("{:?}", r), "()");
458 let v = vec![1, 2, 3];
459 let r: Arc<[u32]> = Arc::from(v);
461 assert_eq!(&r[..], [1, 2, 3]);
468 let r1: Arc<dyn Any + Send + Sync> = Arc::new(i32::MAX);
469 let r2: Arc<dyn Any + Send + Sync> = Arc::new("abc");
471 assert!(r1.clone().downcast::<u32>().is_err());
473 let r1i32 = r1.downcast::<i32>();
474 assert!(r1i32.is_ok());
475 assert_eq!(r1i32.unwrap(), Arc::new(i32::MAX));
477 assert!(r2.clone().downcast::<i32>().is_err());
479 let r2str = r2.downcast::<&'static str>();
480 assert!(r2str.is_ok());
481 assert_eq!(r2str.unwrap(), Arc::new("abc"));
485 fn test_array_from_slice() {
486 let v = vec![1, 2, 3];
487 let r: Arc<[u32]> = Arc::from(v);
489 let a: Result<Arc<[u32; 3]>, _> = r.clone().try_into();
492 let a: Result<Arc<[u32; 2]>, _> = r.clone().try_into();
497 fn test_arc_cyclic_with_zero_refs() {
499 inner: Weak<ZeroRefs>,
501 let zero_refs = Arc::new_cyclic(|inner| {
502 assert_eq!(inner.strong_count(), 0);
503 assert!(inner.upgrade().is_none());
504 ZeroRefs { inner: Weak::new() }
507 assert_eq!(Arc::strong_count(&zero_refs), 1);
508 assert_eq!(Arc::weak_count(&zero_refs), 0);
509 assert_eq!(zero_refs.inner.strong_count(), 0);
510 assert_eq!(zero_refs.inner.weak_count(), 0);
514 fn test_arc_new_cyclic_one_ref() {
518 let one_ref = Arc::new_cyclic(|inner| {
519 assert_eq!(inner.strong_count(), 0);
520 assert!(inner.upgrade().is_none());
521 OneRef { inner: inner.clone() }
524 assert_eq!(Arc::strong_count(&one_ref), 1);
525 assert_eq!(Arc::weak_count(&one_ref), 1);
527 let one_ref2 = Weak::upgrade(&one_ref.inner).unwrap();
528 assert!(Arc::ptr_eq(&one_ref, &one_ref2));
530 assert_eq!(Arc::strong_count(&one_ref), 2);
531 assert_eq!(Arc::weak_count(&one_ref), 1);
535 fn test_arc_cyclic_two_refs() {
537 inner1: Weak<TwoRefs>,
538 inner2: Weak<TwoRefs>,
540 let two_refs = Arc::new_cyclic(|inner| {
541 assert_eq!(inner.strong_count(), 0);
542 assert!(inner.upgrade().is_none());
544 let inner1 = inner.clone();
545 let inner2 = inner1.clone();
547 TwoRefs { inner1, inner2 }
550 assert_eq!(Arc::strong_count(&two_refs), 1);
551 assert_eq!(Arc::weak_count(&two_refs), 2);
553 let two_refs1 = Weak::upgrade(&two_refs.inner1).unwrap();
554 assert!(Arc::ptr_eq(&two_refs, &two_refs1));
556 let two_refs2 = Weak::upgrade(&two_refs.inner2).unwrap();
557 assert!(Arc::ptr_eq(&two_refs, &two_refs2));
559 assert_eq!(Arc::strong_count(&two_refs), 3);
560 assert_eq!(Arc::weak_count(&two_refs), 2);