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 #[cfg_attr(miri, ignore)] // Miri does not support threads
36 fn manually_share_arc() {
37 let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
38 let arc_v = Arc::new(v);
40 let (tx, rx) = channel();
42 let _t = thread::spawn(move || {
43 let arc_v: Arc<Vec<i32>> = rx.recv().unwrap();
44 assert_eq!((*arc_v)[3], 4);
47 tx.send(arc_v.clone()).unwrap();
49 assert_eq!((*arc_v)[2], 3);
50 assert_eq!((*arc_v)[4], 5);
54 fn test_arc_get_mut() {
55 let mut x = Arc::new(3);
56 *Arc::get_mut(&mut x).unwrap() = 4;
59 assert!(Arc::get_mut(&mut x).is_none());
61 assert!(Arc::get_mut(&mut x).is_some());
62 let _w = Arc::downgrade(&x);
63 assert!(Arc::get_mut(&mut x).is_none());
68 assert_eq!(Weak::weak_count(&Weak::<u64>::new()), 0);
69 assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
72 let w = Arc::downgrade(&a);
73 assert_eq!(Weak::strong_count(&w), 1);
74 assert_eq!(Weak::weak_count(&w), 1);
76 assert_eq!(Weak::strong_count(&w), 1);
77 assert_eq!(Weak::weak_count(&w), 2);
78 assert_eq!(Weak::strong_count(&w2), 1);
79 assert_eq!(Weak::weak_count(&w2), 2);
81 assert_eq!(Weak::strong_count(&w2), 1);
82 assert_eq!(Weak::weak_count(&w2), 1);
84 assert_eq!(Weak::strong_count(&w2), 2);
85 assert_eq!(Weak::weak_count(&w2), 1);
88 assert_eq!(Weak::strong_count(&w2), 0);
89 assert_eq!(Weak::weak_count(&w2), 0);
96 assert_eq!(Arc::try_unwrap(x), Ok(3));
99 assert_eq!(Arc::try_unwrap(x), Err(Arc::new(4)));
101 let _w = Arc::downgrade(&x);
102 assert_eq!(Arc::try_unwrap(x), Ok(5));
107 let x = Arc::new(box "hello");
110 let x_ptr = Arc::into_raw(x);
113 assert_eq!(**x_ptr, "hello");
115 let x = Arc::from_raw(x_ptr);
116 assert_eq!(**x, "hello");
118 assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
123 fn test_into_from_raw_unsized() {
124 use std::fmt::Display;
125 use std::string::ToString;
127 let arc: Arc<str> = Arc::from("foo");
129 let ptr = Arc::into_raw(arc.clone());
130 let arc2 = unsafe { Arc::from_raw(ptr) };
132 assert_eq!(unsafe { &*ptr }, "foo");
133 assert_eq!(arc, arc2);
135 let arc: Arc<dyn Display> = Arc::new(123);
137 let ptr = Arc::into_raw(arc.clone());
138 let arc2 = unsafe { Arc::from_raw(ptr) };
140 assert_eq!(unsafe { &*ptr }.to_string(), "123");
141 assert_eq!(arc2.to_string(), "123");
145 fn test_cowarc_clone_make_mut() {
146 let mut cow0 = Arc::new(75);
147 let mut cow1 = cow0.clone();
148 let mut cow2 = cow1.clone();
150 assert!(75 == *Arc::make_mut(&mut cow0));
151 assert!(75 == *Arc::make_mut(&mut cow1));
152 assert!(75 == *Arc::make_mut(&mut cow2));
154 *Arc::make_mut(&mut cow0) += 1;
155 *Arc::make_mut(&mut cow1) += 2;
156 *Arc::make_mut(&mut cow2) += 3;
158 assert!(76 == *cow0);
159 assert!(77 == *cow1);
160 assert!(78 == *cow2);
162 // none should point to the same backing memory
163 assert!(*cow0 != *cow1);
164 assert!(*cow0 != *cow2);
165 assert!(*cow1 != *cow2);
169 fn test_cowarc_clone_unique2() {
170 let mut cow0 = Arc::new(75);
171 let cow1 = cow0.clone();
172 let cow2 = cow1.clone();
174 assert!(75 == *cow0);
175 assert!(75 == *cow1);
176 assert!(75 == *cow2);
178 *Arc::make_mut(&mut cow0) += 1;
179 assert!(76 == *cow0);
180 assert!(75 == *cow1);
181 assert!(75 == *cow2);
183 // cow1 and cow2 should share the same contents
184 // cow0 should have a unique reference
185 assert!(*cow0 != *cow1);
186 assert!(*cow0 != *cow2);
187 assert!(*cow1 == *cow2);
191 fn test_cowarc_clone_weak() {
192 let mut cow0 = Arc::new(75);
193 let cow1_weak = Arc::downgrade(&cow0);
195 assert!(75 == *cow0);
196 assert!(75 == *cow1_weak.upgrade().unwrap());
198 *Arc::make_mut(&mut cow0) += 1;
200 assert!(76 == *cow0);
201 assert!(cow1_weak.upgrade().is_none());
207 let y = Arc::downgrade(&x);
208 assert!(y.upgrade().is_some());
214 let y = Arc::downgrade(&x);
216 assert!(y.upgrade().is_none());
220 fn weak_self_cyclic() {
222 x: Mutex<Option<Weak<Cycle>>>,
225 let a = Arc::new(Cycle { x: Mutex::new(None) });
226 let b = Arc::downgrade(&a.clone());
227 *a.x.lock().unwrap() = Some(b);
229 // hopefully we don't double-free (or leak)...
234 let mut canary = atomic::AtomicUsize::new(0);
235 let x = Arc::new(Canary(&mut canary as *mut atomic::AtomicUsize));
237 assert!(canary.load(Acquire) == 1);
242 let mut canary = atomic::AtomicUsize::new(0);
243 let arc = Arc::new(Canary(&mut canary as *mut atomic::AtomicUsize));
244 let arc_weak = Arc::downgrade(&arc);
245 assert!(canary.load(Acquire) == 0);
247 assert!(canary.load(Acquire) == 1);
252 fn test_strong_count() {
254 assert!(Arc::strong_count(&a) == 1);
255 let w = Arc::downgrade(&a);
256 assert!(Arc::strong_count(&a) == 1);
257 let b = w.upgrade().expect("");
258 assert!(Arc::strong_count(&b) == 2);
259 assert!(Arc::strong_count(&a) == 2);
262 assert!(Arc::strong_count(&b) == 1);
264 assert!(Arc::strong_count(&b) == 2);
265 assert!(Arc::strong_count(&c) == 2);
269 fn test_weak_count() {
271 assert!(Arc::strong_count(&a) == 1);
272 assert!(Arc::weak_count(&a) == 0);
273 let w = Arc::downgrade(&a);
274 assert!(Arc::strong_count(&a) == 1);
275 assert!(Arc::weak_count(&a) == 1);
277 assert!(Arc::weak_count(&a) == 2);
280 assert!(Arc::strong_count(&a) == 1);
281 assert!(Arc::weak_count(&a) == 0);
283 assert!(Arc::strong_count(&a) == 2);
284 assert!(Arc::weak_count(&a) == 0);
285 let d = Arc::downgrade(&c);
286 assert!(Arc::weak_count(&c) == 1);
287 assert!(Arc::strong_count(&c) == 2);
297 assert_eq!(format!("{:?}", a), "5");
300 // Make sure deriving works with Arc<T>
301 #[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
308 let x: Arc<[i32]> = Arc::new([1, 2, 3]);
309 assert_eq!(format!("{:?}", x), "[1, 2, 3]");
310 let y = Arc::downgrade(&x.clone());
312 assert!(y.upgrade().is_none());
316 fn test_from_owned() {
318 let foo_arc = Arc::from(foo);
319 assert!(123 == *foo_arc);
324 let foo: Weak<usize> = Weak::new();
325 assert!(foo.upgrade().is_none());
330 let five = Arc::new(5);
331 let same_five = five.clone();
332 let other_five = Arc::new(5);
334 assert!(Arc::ptr_eq(&five, &same_five));
335 assert!(!Arc::ptr_eq(&five, &other_five));
339 #[cfg_attr(target_os = "emscripten", ignore)]
340 #[cfg_attr(miri, ignore)] // Miri does not support threads
341 fn test_weak_count_locked() {
342 let mut a = Arc::new(atomic::AtomicBool::new(false));
344 let t = thread::spawn(move || {
345 for _i in 0..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);
360 let r: Arc<str> = Arc::from("foo");
362 assert_eq!(&r[..], "foo");
366 fn test_copy_from_slice() {
367 let s: &[u32] = &[1, 2, 3];
368 let r: Arc<[u32]> = Arc::from(s);
370 assert_eq!(&r[..], [1, 2, 3]);
374 fn test_clone_from_slice() {
375 #[derive(Clone, Debug, Eq, PartialEq)]
378 let s: &[X] = &[X(1), X(2), X(3)];
379 let r: Arc<[X]> = Arc::from(s);
381 assert_eq!(&r[..], s);
386 fn test_clone_from_slice_panic() {
387 use std::string::{String, ToString};
389 struct Fail(u32, String);
391 impl Clone for Fail {
392 fn clone(&self) -> Fail {
396 Fail(self.0, self.1.clone())
401 &[Fail(0, "foo".to_string()), Fail(1, "bar".to_string()), Fail(2, "baz".to_string())];
403 // Should panic, but not cause memory corruption
404 let _r: Arc<[Fail]> = Arc::from(s);
409 let b: Box<u32> = box 123;
410 let r: Arc<u32> = Arc::from(b);
416 fn test_from_box_str() {
417 use std::string::String;
419 let s = String::from("foo").into_boxed_str();
420 let r: Arc<str> = Arc::from(s);
422 assert_eq!(&r[..], "foo");
426 fn test_from_box_slice() {
427 let s = vec![1, 2, 3].into_boxed_slice();
428 let r: Arc<[u32]> = Arc::from(s);
430 assert_eq!(&r[..], [1, 2, 3]);
434 fn test_from_box_trait() {
435 use std::fmt::Display;
436 use std::string::ToString;
438 let b: Box<dyn Display> = box 123;
439 let r: Arc<dyn Display> = Arc::from(b);
441 assert_eq!(r.to_string(), "123");
445 fn test_from_box_trait_zero_sized() {
448 let b: Box<dyn Debug> = box ();
449 let r: Arc<dyn Debug> = Arc::from(b);
451 assert_eq!(format!("{:?}", r), "()");
456 let v = vec![1, 2, 3];
457 let r: Arc<[u32]> = Arc::from(v);
459 assert_eq!(&r[..], [1, 2, 3]);
466 let r1: Arc<dyn Any + Send + Sync> = Arc::new(i32::max_value());
467 let r2: Arc<dyn Any + Send + Sync> = Arc::new("abc");
469 assert!(r1.clone().downcast::<u32>().is_err());
471 let r1i32 = r1.downcast::<i32>();
472 assert!(r1i32.is_ok());
473 assert_eq!(r1i32.unwrap(), Arc::new(i32::max_value()));
475 assert!(r2.clone().downcast::<i32>().is_err());
477 let r2str = r2.downcast::<&'static str>();
478 assert!(r2str.is_ok());
479 assert_eq!(r2str.unwrap(), Arc::new("abc"));
483 fn test_array_from_slice() {
484 let v = vec![1, 2, 3];
485 let r: Arc<[u32]> = Arc::from(v);
487 let a: Result<Arc<[u32; 3]>, _> = r.clone().try_into();
490 let a: Result<Arc<[u32; 2]>, _> = r.clone().try_into();