5 use std::sync::mpsc::channel;
8 use std::option::Option::{self, None, Some};
9 use std::sync::atomic::{self, Ordering::{Acquire, SeqCst}};
12 use std::convert::{From, TryInto};
16 struct Canary(*mut atomic::AtomicUsize);
18 impl Drop for Canary {
23 (*c).fetch_add(1, SeqCst);
31 #[cfg_attr(target_os = "emscripten", ignore)]
32 #[cfg(not(miri))] // Miri does not support threads
33 fn manually_share_arc() {
34 let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
35 let arc_v = Arc::new(v);
37 let (tx, rx) = channel();
39 let _t = thread::spawn(move || {
40 let arc_v: Arc<Vec<i32>> = rx.recv().unwrap();
41 assert_eq!((*arc_v)[3], 4);
44 tx.send(arc_v.clone()).unwrap();
46 assert_eq!((*arc_v)[2], 3);
47 assert_eq!((*arc_v)[4], 5);
51 fn test_arc_get_mut() {
52 let mut x = Arc::new(3);
53 *Arc::get_mut(&mut x).unwrap() = 4;
56 assert!(Arc::get_mut(&mut x).is_none());
58 assert!(Arc::get_mut(&mut x).is_some());
59 let _w = Arc::downgrade(&x);
60 assert!(Arc::get_mut(&mut x).is_none());
65 assert_eq!(Weak::weak_count(&Weak::<u64>::new()), None);
66 assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
69 let w = Arc::downgrade(&a);
70 assert_eq!(Weak::strong_count(&w), 1);
71 assert_eq!(Weak::weak_count(&w), Some(1));
73 assert_eq!(Weak::strong_count(&w), 1);
74 assert_eq!(Weak::weak_count(&w), Some(2));
75 assert_eq!(Weak::strong_count(&w2), 1);
76 assert_eq!(Weak::weak_count(&w2), Some(2));
78 assert_eq!(Weak::strong_count(&w2), 1);
79 assert_eq!(Weak::weak_count(&w2), Some(1));
81 assert_eq!(Weak::strong_count(&w2), 2);
82 assert_eq!(Weak::weak_count(&w2), Some(1));
85 assert_eq!(Weak::strong_count(&w2), 0);
86 assert_eq!(Weak::weak_count(&w2), Some(1));
93 assert_eq!(Arc::try_unwrap(x), Ok(3));
96 assert_eq!(Arc::try_unwrap(x), Err(Arc::new(4)));
98 let _w = Arc::downgrade(&x);
99 assert_eq!(Arc::try_unwrap(x), Ok(5));
104 let x = Arc::new(box "hello");
107 let x_ptr = Arc::into_raw(x);
110 assert_eq!(**x_ptr, "hello");
112 let x = Arc::from_raw(x_ptr);
113 assert_eq!(**x, "hello");
115 assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
120 fn test_into_from_raw_unsized() {
121 use std::fmt::Display;
122 use std::string::ToString;
124 let arc: Arc<str> = Arc::from("foo");
126 let ptr = Arc::into_raw(arc.clone());
127 let arc2 = unsafe { Arc::from_raw(ptr) };
129 assert_eq!(unsafe { &*ptr }, "foo");
130 assert_eq!(arc, arc2);
132 let arc: Arc<dyn Display> = Arc::new(123);
134 let ptr = Arc::into_raw(arc.clone());
135 let arc2 = unsafe { Arc::from_raw(ptr) };
137 assert_eq!(unsafe { &*ptr }.to_string(), "123");
138 assert_eq!(arc2.to_string(), "123");
142 fn test_cowarc_clone_make_mut() {
143 let mut cow0 = Arc::new(75);
144 let mut cow1 = cow0.clone();
145 let mut cow2 = cow1.clone();
147 assert!(75 == *Arc::make_mut(&mut cow0));
148 assert!(75 == *Arc::make_mut(&mut cow1));
149 assert!(75 == *Arc::make_mut(&mut cow2));
151 *Arc::make_mut(&mut cow0) += 1;
152 *Arc::make_mut(&mut cow1) += 2;
153 *Arc::make_mut(&mut cow2) += 3;
155 assert!(76 == *cow0);
156 assert!(77 == *cow1);
157 assert!(78 == *cow2);
159 // none should point to the same backing memory
160 assert!(*cow0 != *cow1);
161 assert!(*cow0 != *cow2);
162 assert!(*cow1 != *cow2);
166 fn test_cowarc_clone_unique2() {
167 let mut cow0 = Arc::new(75);
168 let cow1 = cow0.clone();
169 let cow2 = cow1.clone();
171 assert!(75 == *cow0);
172 assert!(75 == *cow1);
173 assert!(75 == *cow2);
175 *Arc::make_mut(&mut cow0) += 1;
176 assert!(76 == *cow0);
177 assert!(75 == *cow1);
178 assert!(75 == *cow2);
180 // cow1 and cow2 should share the same contents
181 // cow0 should have a unique reference
182 assert!(*cow0 != *cow1);
183 assert!(*cow0 != *cow2);
184 assert!(*cow1 == *cow2);
188 fn test_cowarc_clone_weak() {
189 let mut cow0 = Arc::new(75);
190 let cow1_weak = Arc::downgrade(&cow0);
192 assert!(75 == *cow0);
193 assert!(75 == *cow1_weak.upgrade().unwrap());
195 *Arc::make_mut(&mut cow0) += 1;
197 assert!(76 == *cow0);
198 assert!(cow1_weak.upgrade().is_none());
204 let y = Arc::downgrade(&x);
205 assert!(y.upgrade().is_some());
211 let y = Arc::downgrade(&x);
213 assert!(y.upgrade().is_none());
217 fn weak_self_cyclic() {
219 x: Mutex<Option<Weak<Cycle>>>,
222 let a = Arc::new(Cycle { x: Mutex::new(None) });
223 let b = Arc::downgrade(&a.clone());
224 *a.x.lock().unwrap() = Some(b);
226 // hopefully we don't double-free (or leak)...
231 let mut canary = atomic::AtomicUsize::new(0);
232 let x = Arc::new(Canary(&mut canary as *mut atomic::AtomicUsize));
234 assert!(canary.load(Acquire) == 1);
239 let mut canary = atomic::AtomicUsize::new(0);
240 let arc = Arc::new(Canary(&mut canary as *mut atomic::AtomicUsize));
241 let arc_weak = Arc::downgrade(&arc);
242 assert!(canary.load(Acquire) == 0);
244 assert!(canary.load(Acquire) == 1);
249 fn test_strong_count() {
251 assert!(Arc::strong_count(&a) == 1);
252 let w = Arc::downgrade(&a);
253 assert!(Arc::strong_count(&a) == 1);
254 let b = w.upgrade().expect("");
255 assert!(Arc::strong_count(&b) == 2);
256 assert!(Arc::strong_count(&a) == 2);
259 assert!(Arc::strong_count(&b) == 1);
261 assert!(Arc::strong_count(&b) == 2);
262 assert!(Arc::strong_count(&c) == 2);
266 fn test_weak_count() {
268 assert!(Arc::strong_count(&a) == 1);
269 assert!(Arc::weak_count(&a) == 0);
270 let w = Arc::downgrade(&a);
271 assert!(Arc::strong_count(&a) == 1);
272 assert!(Arc::weak_count(&a) == 1);
274 assert!(Arc::weak_count(&a) == 2);
277 assert!(Arc::strong_count(&a) == 1);
278 assert!(Arc::weak_count(&a) == 0);
280 assert!(Arc::strong_count(&a) == 2);
281 assert!(Arc::weak_count(&a) == 0);
282 let d = Arc::downgrade(&c);
283 assert!(Arc::weak_count(&c) == 1);
284 assert!(Arc::strong_count(&c) == 2);
294 assert_eq!(format!("{:?}", a), "5");
297 // Make sure deriving works with Arc<T>
298 #[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
305 let x: Arc<[i32]> = Arc::new([1, 2, 3]);
306 assert_eq!(format!("{:?}", x), "[1, 2, 3]");
307 let y = Arc::downgrade(&x.clone());
309 assert!(y.upgrade().is_none());
313 fn test_from_owned() {
315 let foo_arc = Arc::from(foo);
316 assert!(123 == *foo_arc);
321 let foo: Weak<usize> = Weak::new();
322 assert!(foo.upgrade().is_none());
327 let five = Arc::new(5);
328 let same_five = five.clone();
329 let other_five = Arc::new(5);
331 assert!(Arc::ptr_eq(&five, &same_five));
332 assert!(!Arc::ptr_eq(&five, &other_five));
336 #[cfg_attr(target_os = "emscripten", ignore)]
337 #[cfg(not(miri))] // Miri does not support threads
338 fn test_weak_count_locked() {
339 let mut a = Arc::new(atomic::AtomicBool::new(false));
341 let t = thread::spawn(move || {
342 for _i in 0..1000000 {
343 Arc::get_mut(&mut a);
345 a.store(true, SeqCst);
348 while !a2.load(SeqCst) {
349 let n = Arc::weak_count(&a2);
350 assert!(n < 2, "bad weak count: {}", n);
357 let r: Arc<str> = Arc::from("foo");
359 assert_eq!(&r[..], "foo");
363 fn test_copy_from_slice() {
364 let s: &[u32] = &[1, 2, 3];
365 let r: Arc<[u32]> = Arc::from(s);
367 assert_eq!(&r[..], [1, 2, 3]);
371 fn test_clone_from_slice() {
372 #[derive(Clone, Debug, Eq, PartialEq)]
375 let s: &[X] = &[X(1), X(2), X(3)];
376 let r: Arc<[X]> = Arc::from(s);
378 assert_eq!(&r[..], s);
383 fn test_clone_from_slice_panic() {
384 use std::string::{String, ToString};
386 struct Fail(u32, String);
388 impl Clone for Fail {
389 fn clone(&self) -> Fail {
393 Fail(self.0, self.1.clone())
398 Fail(0, "foo".to_string()),
399 Fail(1, "bar".to_string()),
400 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();