1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 //! ## The threading model
15 //! An executing Rust program consists of a collection of native OS threads,
16 //! each with their own stack and local state.
18 //! Communication between threads can be done through
19 //! [channels](../../std/sync/mpsc/index.html), Rust's message-passing
20 //! types, along with [other forms of thread
21 //! synchronization](../../std/sync/index.html) and shared-memory data
22 //! structures. In particular, types that are guaranteed to be
23 //! threadsafe are easily shared between threads using the
24 //! atomically-reference-counted container,
25 //! [`Arc`](../../std/sync/struct.Arc.html).
27 //! Fatal logic errors in Rust cause *thread panic*, during which
28 //! a thread will unwind the stack, running destructors and freeing
29 //! owned resources. Thread panic is unrecoverable from within
30 //! the panicking thread (i.e. there is no 'try/catch' in Rust), but
31 //! the panic may optionally be detected from a different thread. If
32 //! the main thread panics, the application will exit with a non-zero
35 //! When the main thread of a Rust program terminates, the entire program shuts
36 //! down, even if other threads are still running. However, this module provides
37 //! convenient facilities for automatically waiting for the termination of a
38 //! child thread (i.e., join).
40 //! ## The `Thread` type
42 //! Threads are represented via the `Thread` type, which you can
43 //! get in one of two ways:
45 //! * By spawning a new thread, e.g. using the `thread::spawn` function.
46 //! * By requesting the current thread, using the `thread::current` function.
48 //! Threads can be named, and provide some built-in support for low-level
49 //! synchronization (described below).
51 //! The `thread::current()` function is available even for threads not spawned
52 //! by the APIs of this module.
54 //! ## Spawning a thread
56 //! A new thread can be spawned using the `thread::spawn` function:
61 //! thread::spawn(move || {
66 //! In this example, the spawned thread is "detached" from the current
67 //! thread. This means that it can outlive its parent (the thread that spawned
68 //! it), unless this parent is the main thread.
70 //! The parent thread can also wait on the completion of the child
71 //! thread; a call to `spawn` produces a `JoinHandle`, which provides
72 //! a `join` method for waiting:
77 //! let child = thread::spawn(move || {
81 //! let res = child.join();
84 //! The `join` method returns a `Result` containing `Ok` of the final
85 //! value produced by the child thread, or `Err` of the value given to
86 //! a call to `panic!` if the child panicked.
88 //! ## Configuring threads
90 //! A new thread can be configured before it is spawned via the `Builder` type,
91 //! which currently allows you to set the name and stack size for the child thread:
94 //! # #![allow(unused_must_use)]
97 //! thread::Builder::new().name("child1".to_string()).spawn(move || {
98 //! println!("Hello, world!");
102 //! ## Blocking support: park and unpark
104 //! Every thread is equipped with some basic low-level blocking support, via the
105 //! `park` and `unpark` functions.
107 //! Conceptually, each `Thread` handle has an associated token, which is
108 //! initially not present:
110 //! * The `thread::park()` function blocks the current thread unless or until
111 //! the token is available for its thread handle, at which point it atomically
112 //! consumes the token. It may also return *spuriously*, without consuming the
113 //! token. `thread::park_timeout()` does the same, but allows specifying a
114 //! maximum time to block the thread for.
116 //! * The `unpark()` method on a `Thread` atomically makes the token available
117 //! if it wasn't already.
119 //! In other words, each `Thread` acts a bit like a semaphore with initial count
120 //! 0, except that the semaphore is *saturating* (the count cannot go above 1),
121 //! and can return spuriously.
123 //! The API is typically used by acquiring a handle to the current thread,
124 //! placing that handle in a shared data structure so that other threads can
125 //! find it, and then `park`ing. When some desired condition is met, another
126 //! thread calls `unpark` on the handle.
128 //! The motivation for this design is twofold:
130 //! * It avoids the need to allocate mutexes and condvars when building new
131 //! synchronization primitives; the threads already provide basic blocking/signaling.
133 //! * It can be implemented very efficiently on many platforms.
135 //! ## Thread-local storage
137 //! This module also provides an implementation of thread local storage for Rust
138 //! programs. Thread local storage is a method of storing data into a global
139 //! variable which each thread in the program will have its own copy of.
140 //! Threads do not share this data, so accesses do not need to be synchronized.
142 //! At a high level, this module provides two variants of storage:
144 //! * Owned thread-local storage. This is a type of thread local key which
145 //! owns the value that it contains, and will destroy the value when the
146 //! thread exits. This variant is created with the `thread_local!` macro and
147 //! can contain any value which is `'static` (no borrowed pointers).
149 //! * Scoped thread-local storage. This type of key is used to store a reference
150 //! to a value into local storage temporarily for the scope of a function
151 //! call. There are no restrictions on what types of values can be placed
154 //! Both forms of thread local storage provide an accessor function, `with`,
155 //! which will yield a shared reference to the value to the specified
156 //! closure. Thread-local keys only allow shared access to values as there is no
157 //! way to guarantee uniqueness if a mutable borrow was allowed. Most values
158 //! will want to make use of some form of **interior mutability** through the
159 //! `Cell` or `RefCell` types.
161 #![stable(feature = "rust1", since = "1.0.0")]
166 use cell::UnsafeCell;
169 use sync::{Mutex, Condvar, Arc};
170 use sys::thread as imp;
171 use sys_common::thread_info;
172 use sys_common::unwind;
173 use sys_common::util;
174 use sys_common::{AsInner, IntoInner};
177 ////////////////////////////////////////////////////////////////////////////////
178 // Thread-local storage
179 ////////////////////////////////////////////////////////////////////////////////
181 #[macro_use] mod local;
182 #[macro_use] mod scoped_tls;
184 #[stable(feature = "rust1", since = "1.0.0")]
185 pub use self::local::{LocalKey, LocalKeyState};
187 #[unstable(feature = "scoped_tls",
188 reason = "scoped TLS has yet to have wide enough use to fully \
189 consider stabilizing its interface",
191 pub use self::scoped_tls::ScopedKey;
193 #[unstable(feature = "libstd_thread_internals", issue = "0")]
194 #[cfg(target_thread_local)]
195 #[doc(hidden)] pub use self::local::elf::Key as __ElfLocalKeyInner;
196 #[unstable(feature = "libstd_thread_internals", issue = "0")]
197 #[doc(hidden)] pub use self::local::os::Key as __OsLocalKeyInner;
198 #[unstable(feature = "libstd_thread_internals", issue = "0")]
199 #[doc(hidden)] pub use self::scoped_tls::__KeyInner as __ScopedKeyInner;
201 ////////////////////////////////////////////////////////////////////////////////
203 ////////////////////////////////////////////////////////////////////////////////
205 /// Thread configuration. Provides detailed control over the properties
206 /// and behavior of new threads.
207 #[stable(feature = "rust1", since = "1.0.0")]
209 // A name for the thread-to-be, for identification in panic messages
210 name: Option<String>,
211 // The size of the stack for the spawned thread
212 stack_size: Option<usize>,
216 /// Generates the base configuration for spawning a thread, from which
217 /// configuration methods can be chained.
218 #[stable(feature = "rust1", since = "1.0.0")]
219 pub fn new() -> Builder {
226 /// Names the thread-to-be. Currently the name is used for identification
227 /// only in panic messages.
228 #[stable(feature = "rust1", since = "1.0.0")]
229 pub fn name(mut self, name: String) -> Builder {
230 self.name = Some(name);
234 /// Sets the size of the stack for the new thread.
235 #[stable(feature = "rust1", since = "1.0.0")]
236 pub fn stack_size(mut self, size: usize) -> Builder {
237 self.stack_size = Some(size);
241 /// Spawns a new thread, and returns a join handle for it.
243 /// The child thread may outlive the parent (unless the parent thread
244 /// is the main thread; the whole process is terminated when the main
245 /// thread finishes). The join handle can be used to block on
246 /// termination of the child thread, including recovering its panics.
250 /// Unlike the `spawn` free function, this method yields an
251 /// `io::Result` to capture any failure to create the thread at
253 #[stable(feature = "rust1", since = "1.0.0")]
254 pub fn spawn<F, T>(self, f: F) -> io::Result<JoinHandle<T>> where
255 F: FnOnce() -> T, F: Send + 'static, T: Send + 'static
257 let Builder { name, stack_size } = self;
259 let stack_size = stack_size.unwrap_or(util::min_stack());
261 let my_thread = Thread::new(name);
262 let their_thread = my_thread.clone();
264 let my_packet : Arc<UnsafeCell<Option<Result<T>>>>
265 = Arc::new(UnsafeCell::new(None));
266 let their_packet = my_packet.clone();
269 if let Some(name) = their_thread.name() {
270 imp::Thread::set_name(name);
273 thread_info::set(imp::guard::current(), their_thread);
274 let mut output = None;
276 let ptr = &mut output;
277 unwind::try(move || *ptr = Some(f()))
279 *their_packet.get() = Some(try_result.map(|()| {
285 Ok(JoinHandle(JoinInner {
287 Some(try!(imp::Thread::new(stack_size, Box::new(main))))
290 packet: Packet(my_packet),
295 ////////////////////////////////////////////////////////////////////////////////
297 ////////////////////////////////////////////////////////////////////////////////
299 /// Spawns a new thread, returning a `JoinHandle` for it.
301 /// The join handle will implicitly *detach* the child thread upon being
302 /// dropped. In this case, the child thread may outlive the parent (unless
303 /// the parent thread is the main thread; the whole process is terminated when
304 /// the main thread finishes.) Additionally, the join handle provides a `join`
305 /// method that can be used to join the child thread. If the child thread
306 /// panics, `join` will return an `Err` containing the argument given to
311 /// Panics if the OS fails to create a thread; use `Builder::spawn`
312 /// to recover from such errors.
313 #[stable(feature = "rust1", since = "1.0.0")]
314 pub fn spawn<F, T>(f: F) -> JoinHandle<T> where
315 F: FnOnce() -> T, F: Send + 'static, T: Send + 'static
317 Builder::new().spawn(f).unwrap()
320 /// Gets a handle to the thread that invokes it.
321 #[stable(feature = "rust1", since = "1.0.0")]
322 pub fn current() -> Thread {
323 thread_info::current_thread().expect("use of std::thread::current() is not \
324 possible after the thread's local \
325 data has been destroyed")
328 /// Cooperatively gives up a timeslice to the OS scheduler.
329 #[stable(feature = "rust1", since = "1.0.0")]
331 imp::Thread::yield_now()
334 /// Determines whether the current thread is unwinding because of panic.
336 #[stable(feature = "rust1", since = "1.0.0")]
337 pub fn panicking() -> bool {
341 /// Invokes a closure, capturing the cause of panic if one occurs.
343 /// This function will return `Ok` with the closure's result if the closure
344 /// does not panic, and will return `Err(cause)` if the closure panics. The
345 /// `cause` returned is the object with which panic was originally invoked.
347 /// It is currently undefined behavior to unwind from Rust code into foreign
348 /// code, so this function is particularly useful when Rust is called from
349 /// another language (normally C). This can run arbitrary Rust code, capturing a
350 /// panic and allowing a graceful handling of the error.
352 /// It is **not** recommended to use this function for a general try/catch
353 /// mechanism. The `Result` type is more appropriate to use for functions that
354 /// can fail on a regular basis.
356 /// The closure provided is required to adhere to the `'static` bound to ensure
357 /// that it cannot reference data in the parent stack frame, mitigating problems
358 /// with exception safety. Furthermore, a `Send` bound is also required,
359 /// providing the same safety guarantees as `thread::spawn` (ensuring the
360 /// closure is properly isolated from the parent).
361 #[unstable(feature = "catch_panic", reason = "recent API addition",
363 #[rustc_deprecated(since = "1.6.0", reason = "renamed to std::panic::recover")]
364 pub fn catch_panic<F, R>(f: F) -> Result<R>
365 where F: FnOnce() -> R + Send + 'static
367 let mut result = None;
369 let result = &mut result;
370 try!(unwind::try(move || *result = Some(f())))
375 /// Puts the current thread to sleep for the specified amount of time.
377 /// The thread may sleep longer than the duration specified due to scheduling
378 /// specifics or platform-dependent functionality. Note that on unix platforms
379 /// this function will not return early due to a signal being received or a
381 #[stable(feature = "rust1", since = "1.0.0")]
382 #[rustc_deprecated(since = "1.6.0", reason = "replaced by `std::thread::sleep`")]
383 pub fn sleep_ms(ms: u32) {
384 sleep(Duration::from_millis(ms as u64))
387 /// Puts the current thread to sleep for the specified amount of time.
389 /// The thread may sleep longer than the duration specified due to scheduling
390 /// specifics or platform-dependent functionality.
392 /// # Platform behavior
394 /// On Unix platforms this function will not return early due to a
395 /// signal being received or a spurious wakeup. Platforms which do not support
396 /// nanosecond precision for sleeping will have `dur` rounded up to the nearest
397 /// granularity of time they can sleep for.
398 #[stable(feature = "thread_sleep", since = "1.4.0")]
399 pub fn sleep(dur: Duration) {
400 imp::Thread::sleep(dur)
403 /// Blocks unless or until the current thread's token is made available.
405 /// Every thread is equipped with some basic low-level blocking support, via
406 /// the `park()` function and the [`unpark()`][unpark] method. These can be
407 /// used as a more CPU-efficient implementation of a spinlock.
409 /// [unpark]: struct.Thread.html#method.unpark
411 /// The API is typically used by acquiring a handle to the current thread,
412 /// placing that handle in a shared data structure so that other threads can
413 /// find it, and then parking (in a loop with a check for the token actually
416 /// A call to `park` does not guarantee that the thread will remain parked
417 /// forever, and callers should be prepared for this possibility.
419 /// See the [module documentation][thread] for more detail.
421 /// [thread]: index.html
423 // The implementation currently uses the trivial strategy of a Mutex+Condvar
424 // with wakeup flag, which does not actually allow spurious wakeups. In the
425 // future, this will be implemented in a more efficient way, perhaps along the lines of
426 // http://cr.openjdk.java.net/~stefank/6989984.1/raw_files/new/src/os/linux/vm/os_linux.cpp
427 // or futuxes, and in either case may allow spurious wakeups.
428 #[stable(feature = "rust1", since = "1.0.0")]
430 let thread = current();
431 let mut guard = thread.inner.lock.lock().unwrap();
433 guard = thread.inner.cvar.wait(guard).unwrap();
438 /// Blocks unless or until the current thread's token is made available or
439 /// the specified duration has been reached (may wake spuriously).
441 /// The semantics of this function are equivalent to `park()` except that the
442 /// thread will be blocked for roughly no longer than *ms*. This method
443 /// should not be used for precise timing due to anomalies such as
444 /// preemption or platform differences that may not cause the maximum
445 /// amount of time waited to be precisely *ms* long.
447 /// See the module doc for more detail.
448 #[stable(feature = "rust1", since = "1.0.0")]
449 #[rustc_deprecated(since = "1.6.0", reason = "replaced by `std::thread::park_timeout`")]
450 pub fn park_timeout_ms(ms: u32) {
451 park_timeout(Duration::from_millis(ms as u64))
454 /// Blocks unless or until the current thread's token is made available or
455 /// the specified duration has been reached (may wake spuriously).
457 /// The semantics of this function are equivalent to `park()` except that the
458 /// thread will be blocked for roughly no longer than *dur*. This method
459 /// should not be used for precise timing due to anomalies such as
460 /// preemption or platform differences that may not cause the maximum
461 /// amount of time waited to be precisely *dur* long.
463 /// See the module doc for more detail.
465 /// # Platform behavior
467 /// Platforms which do not support nanosecond precision for sleeping will have
468 /// `dur` rounded up to the nearest granularity of time they can sleep for.
469 #[stable(feature = "park_timeout", since = "1.4.0")]
470 pub fn park_timeout(dur: Duration) {
471 let thread = current();
472 let mut guard = thread.inner.lock.lock().unwrap();
474 let (g, _) = thread.inner.cvar.wait_timeout(guard, dur).unwrap();
480 ////////////////////////////////////////////////////////////////////////////////
482 ////////////////////////////////////////////////////////////////////////////////
484 /// The internal representation of a `Thread` handle
486 name: Option<String>,
487 lock: Mutex<bool>, // true when there is a buffered unpark
492 #[stable(feature = "rust1", since = "1.0.0")]
493 /// A handle to a thread.
499 // Used only internally to construct a thread object without spawning
500 fn new(name: Option<String>) -> Thread {
502 inner: Arc::new(Inner {
504 lock: Mutex::new(false),
505 cvar: Condvar::new(),
510 /// Atomically makes the handle's token available if it is not already.
512 /// See the module doc for more detail.
513 #[stable(feature = "rust1", since = "1.0.0")]
514 pub fn unpark(&self) {
515 let mut guard = self.inner.lock.lock().unwrap();
518 self.inner.cvar.notify_one();
522 /// Gets the thread's name.
523 #[stable(feature = "rust1", since = "1.0.0")]
524 pub fn name(&self) -> Option<&str> {
525 self.inner.name.as_ref().map(|s| &**s)
529 #[stable(feature = "rust1", since = "1.0.0")]
530 impl fmt::Debug for Thread {
531 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
532 fmt::Debug::fmt(&self.name(), f)
536 // a hack to get around privacy restrictions
537 impl thread_info::NewThread for Thread {
538 fn new(name: Option<String>) -> Thread { Thread::new(name) }
541 ////////////////////////////////////////////////////////////////////////////////
543 ////////////////////////////////////////////////////////////////////////////////
545 /// Indicates the manner in which a thread exited.
547 /// A thread that completes without panicking is considered to exit successfully.
548 #[stable(feature = "rust1", since = "1.0.0")]
549 pub type Result<T> = ::result::Result<T, Box<Any + Send + 'static>>;
551 // This packet is used to communicate the return value between the child thread
552 // and the parent thread. Memory is shared through the `Arc` within and there's
553 // no need for a mutex here because synchronization happens with `join()` (the
554 // parent thread never reads this packet until the child has exited).
556 // This packet itself is then stored into a `JoinInner` which in turns is placed
557 // in `JoinHandle` and `JoinGuard`. Due to the usage of `UnsafeCell` we need to
558 // manually worry about impls like Send and Sync. The type `T` should
559 // already always be Send (otherwise the thread could not have been created) and
560 // this type is inherently Sync because no methods take &self. Regardless,
561 // however, we add inheriting impls for Send/Sync to this type to ensure it's
562 // Send/Sync and that future modifications will still appropriately classify it.
563 struct Packet<T>(Arc<UnsafeCell<Option<Result<T>>>>);
565 unsafe impl<T: Send> Send for Packet<T> {}
566 unsafe impl<T: Sync> Sync for Packet<T> {}
568 /// Inner representation for JoinHandle
569 struct JoinInner<T> {
570 native: Option<imp::Thread>,
575 impl<T> JoinInner<T> {
576 fn join(&mut self) -> Result<T> {
577 self.native.take().unwrap().join();
579 (*self.packet.0.get()).take().unwrap()
584 /// An owned permission to join on a thread (block on its termination).
586 /// A `JoinHandle` *detaches* the child thread when it is dropped.
588 /// Due to platform restrictions, it is not possible to `Clone` this
589 /// handle: the ability to join a child thread is a uniquely-owned
591 #[stable(feature = "rust1", since = "1.0.0")]
592 pub struct JoinHandle<T>(JoinInner<T>);
594 impl<T> JoinHandle<T> {
595 /// Extracts a handle to the underlying thread
596 #[stable(feature = "rust1", since = "1.0.0")]
597 pub fn thread(&self) -> &Thread {
601 /// Waits for the associated thread to finish.
603 /// If the child thread panics, `Err` is returned with the parameter given
605 #[stable(feature = "rust1", since = "1.0.0")]
606 pub fn join(mut self) -> Result<T> {
611 impl<T> AsInner<imp::Thread> for JoinHandle<T> {
612 fn as_inner(&self) -> &imp::Thread { self.0.native.as_ref().unwrap() }
615 impl<T> IntoInner<imp::Thread> for JoinHandle<T> {
616 fn into_inner(self) -> imp::Thread { self.0.native.unwrap() }
619 fn _assert_sync_and_send() {
620 fn _assert_both<T: Send + Sync>() {}
621 _assert_both::<JoinHandle<()>>();
622 _assert_both::<Thread>();
625 ////////////////////////////////////////////////////////////////////////////////
627 ////////////////////////////////////////////////////////////////////////////////
634 use sync::mpsc::{channel, Sender};
636 use super::{Builder};
641 // !!! These tests are dangerous. If something is buggy, they will hang, !!!
642 // !!! instead of exiting cleanly. This might wedge the buildbots. !!!
645 fn test_unnamed_thread() {
646 thread::spawn(move|| {
647 assert!(thread::current().name().is_none());
648 }).join().ok().unwrap();
652 fn test_named_thread() {
653 Builder::new().name("ada lovelace".to_string()).spawn(move|| {
654 assert!(thread::current().name().unwrap() == "ada lovelace".to_string());
655 }).unwrap().join().unwrap();
659 fn test_run_basic() {
660 let (tx, rx) = channel();
661 thread::spawn(move|| {
662 tx.send(()).unwrap();
668 fn test_join_panic() {
669 match thread::spawn(move|| {
672 result::Result::Err(_) => (),
673 result::Result::Ok(()) => panic!()
678 fn test_spawn_sched() {
681 let (tx, rx) = channel();
683 fn f(i: i32, tx: Sender<()>) {
685 thread::spawn(move|| {
687 tx.send(()).unwrap();
699 fn test_spawn_sched_childs_on_default_sched() {
700 let (tx, rx) = channel();
702 thread::spawn(move|| {
703 thread::spawn(move|| {
704 tx.send(()).unwrap();
711 fn avoid_copying_the_body<F>(spawnfn: F) where F: FnOnce(Box<Fn() + Send>) {
712 let (tx, rx) = channel();
714 let x: Box<_> = box 1;
715 let x_in_parent = (&*x) as *const i32 as usize;
717 spawnfn(Box::new(move|| {
718 let x_in_child = (&*x) as *const i32 as usize;
719 tx.send(x_in_child).unwrap();
722 let x_in_child = rx.recv().unwrap();
723 assert_eq!(x_in_parent, x_in_child);
727 fn test_avoid_copying_the_body_spawn() {
728 avoid_copying_the_body(|v| {
729 thread::spawn(move || v());
734 fn test_avoid_copying_the_body_thread_spawn() {
735 avoid_copying_the_body(|f| {
736 thread::spawn(move|| {
743 fn test_avoid_copying_the_body_join() {
744 avoid_copying_the_body(|f| {
745 let _ = thread::spawn(move|| {
752 fn test_child_doesnt_ref_parent() {
753 // If the child refcounts the parent thread, this will stack overflow when
754 // climbing the thread tree to dereference each ancestor. (See #1789)
755 // (well, it would if the constant were 8000+ - I lowered it to be more
756 // valgrind-friendly. try this at home, instead..!)
757 const GENERATIONS: u32 = 16;
758 fn child_no(x: u32) -> Box<Fn() + Send> {
759 return Box::new(move|| {
761 thread::spawn(move|| child_no(x+1)());
765 thread::spawn(|| child_no(0)());
769 fn test_simple_newsched_spawn() {
770 thread::spawn(move || {});
774 fn test_try_panic_message_static_str() {
775 match thread::spawn(move|| {
776 panic!("static string");
779 type T = &'static str;
780 assert!(e.is::<T>());
781 assert_eq!(*e.downcast::<T>().unwrap(), "static string");
788 fn test_try_panic_message_owned_str() {
789 match thread::spawn(move|| {
790 panic!("owned string".to_string());
794 assert!(e.is::<T>());
795 assert_eq!(*e.downcast::<T>().unwrap(), "owned string".to_string());
802 fn test_try_panic_message_any() {
803 match thread::spawn(move|| {
804 panic!(box 413u16 as Box<Any + Send>);
807 type T = Box<Any + Send>;
808 assert!(e.is::<T>());
809 let any = e.downcast::<T>().unwrap();
810 assert!(any.is::<u16>());
811 assert_eq!(*any.downcast::<u16>().unwrap(), 413);
818 fn test_try_panic_message_unit_struct() {
821 match thread::spawn(move|| {
824 Err(ref e) if e.is::<Juju>() => {}
825 Err(_) | Ok(()) => panic!()
830 fn test_park_timeout_unpark_before() {
832 thread::current().unpark();
833 thread::park_timeout(Duration::from_millis(u32::MAX as u64));
838 fn test_park_timeout_unpark_not_called() {
840 thread::park_timeout(Duration::from_millis(10));
845 fn test_park_timeout_unpark_called_other_thread() {
847 let th = thread::current();
849 let _guard = thread::spawn(move || {
850 super::sleep(Duration::from_millis(50));
854 thread::park_timeout(Duration::from_millis(u32::MAX as u64));
859 fn sleep_ms_smoke() {
860 thread::sleep(Duration::from_millis(2));
863 // NOTE: the corresponding test for stderr is in run-pass/thread-stderr, due
864 // to the test harness apparently interfering with stderr configuration.