| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| //! Native threads |
| //! |
| //! ## The threading model |
| //! |
| //! An executing Rust program consists of a collection of native OS threads, |
| //! each with their own stack and local state. |
| //! |
| //! Communication between threads can be done through |
| //! [channels](../../std/sync/mpsc/index.html), Rust's message-passing |
| //! types, along with [other forms of thread |
| //! synchronization](../../std/sync/index.html) and shared-memory data |
| //! structures. In particular, types that are guaranteed to be |
| //! threadsafe are easily shared between threads using the |
| //! atomically-reference-counted container, |
| //! [`Arc`](../../std/sync/struct.Arc.html). |
| //! |
| //! Fatal logic errors in Rust cause *thread panic*, during which |
| //! a thread will unwind the stack, running destructors and freeing |
| //! owned resources. Thread panic is unrecoverable from within |
| //! the panicking thread (i.e. there is no 'try/catch' in Rust), but |
| //! the panic may optionally be detected from a different thread. If |
| //! the main thread panics, the application will exit with a non-zero |
| //! exit code. |
| //! |
| //! When the main thread of a Rust program terminates, the entire program shuts |
| //! down, even if other threads are still running. However, this module provides |
| //! convenient facilities for automatically waiting for the termination of a |
| //! child thread (i.e., join). |
| //! |
| //! ## The `Thread` type |
| //! |
| //! Threads are represented via the `Thread` type, which you can |
| //! get in one of two ways: |
| //! |
| //! * By spawning a new thread, e.g. using the `thread::spawn` function. |
| //! * By requesting the current thread, using the `thread::current` function. |
| //! |
| //! Threads can be named, and provide some built-in support for low-level |
| //! synchronization (described below). |
| //! |
| //! The `thread::current()` function is available even for threads not spawned |
| //! by the APIs of this module. |
| //! |
| //! ## Spawning a thread |
| //! |
| //! A new thread can be spawned using the `thread::spawn` function: |
| //! |
| //! ```rust |
| //! use std::thread; |
| //! |
| //! thread::spawn(move || { |
| //! // some work here |
| //! }); |
| //! ``` |
| //! |
| //! In this example, the spawned thread is "detached" from the current |
| //! thread. This means that it can outlive its parent (the thread that spawned |
| //! it), unless this parent is the main thread. |
| //! |
| //! The parent thread can also wait on the completion of the child |
| //! thread; a call to `spawn` produces a `JoinHandle`, which provides |
| //! a `join` method for waiting: |
| //! |
| //! ```rust |
| //! use std::thread; |
| //! |
| //! let child = thread::spawn(move || { |
| //! // some work here |
| //! }); |
| //! // some work here |
| //! let res = child.join(); |
| //! ``` |
| //! |
| //! The `join` method returns a `Result` containing `Ok` of the final |
| //! value produced by the child thread, or `Err` of the value given to |
| //! a call to `panic!` if the child panicked. |
| //! |
| //! ## Configuring threads |
| //! |
| //! A new thread can be configured before it is spawned via the `Builder` type, |
| //! which currently allows you to set the name and stack size for the child thread: |
| //! |
| //! ```rust |
| //! # #![allow(unused_must_use)] |
| //! use std::thread; |
| //! |
| //! thread::Builder::new().name("child1".to_string()).spawn(move || { |
| //! println!("Hello, world!"); |
| //! }); |
| //! ``` |
| //! |
| //! ## Blocking support: park and unpark |
| //! |
| //! Every thread is equipped with some basic low-level blocking support, via the |
| //! `park` and `unpark` functions. |
| //! |
| //! Conceptually, each `Thread` handle has an associated token, which is |
| //! initially not present: |
| //! |
| //! * The `thread::park()` function blocks the current thread unless or until |
| //! the token is available for its thread handle, at which point it atomically |
| //! consumes the token. It may also return *spuriously*, without consuming the |
| //! token. `thread::park_timeout()` does the same, but allows specifying a |
| //! maximum time to block the thread for. |
| //! |
| //! * The `unpark()` method on a `Thread` atomically makes the token available |
| //! if it wasn't already. |
| //! |
| //! In other words, each `Thread` acts a bit like a semaphore with initial count |
| //! 0, except that the semaphore is *saturating* (the count cannot go above 1), |
| //! and can return spuriously. |
| //! |
| //! The API is typically used by acquiring a handle to the current thread, |
| //! placing that handle in a shared data structure so that other threads can |
| //! find it, and then `park`ing. When some desired condition is met, another |
| //! thread calls `unpark` on the handle. |
| //! |
| //! The motivation for this design is twofold: |
| //! |
| //! * It avoids the need to allocate mutexes and condvars when building new |
| //! synchronization primitives; the threads already provide basic blocking/signaling. |
| //! |
| //! * It can be implemented very efficiently on many platforms. |
| //! |
| //! ## Thread-local storage |
| //! |
| //! This module also provides an implementation of thread local storage for Rust |
| //! programs. Thread local storage is a method of storing data into a global |
| //! variable which each thread in the program will have its own copy of. |
| //! Threads do not share this data, so accesses do not need to be synchronized. |
| //! |
| //! At a high level, this module provides two variants of storage: |
| //! |
| //! * Owned thread-local storage. This is a type of thread local key which |
| //! owns the value that it contains, and will destroy the value when the |
| //! thread exits. This variant is created with the `thread_local!` macro and |
| //! can contain any value which is `'static` (no borrowed pointers). |
| //! |
| //! * Scoped thread-local storage. This type of key is used to store a reference |
| //! to a value into local storage temporarily for the scope of a function |
| //! call. There are no restrictions on what types of values can be placed |
| //! into this key. |
| //! |
| //! Both forms of thread local storage provide an accessor function, `with`, |
| //! which will yield a shared reference to the value to the specified |
| //! closure. Thread-local keys only allow shared access to values as there is no |
| //! way to guarantee uniqueness if a mutable borrow was allowed. Most values |
| //! will want to make use of some form of **interior mutability** through the |
| //! `Cell` or `RefCell` types. |
| |
| #![stable(feature = "rust1", since = "1.0.0")] |
| |
| use prelude::v1::*; |
| |
| use any::Any; |
| use cell::UnsafeCell; |
| use fmt; |
| use io; |
| use sync::{Mutex, Condvar, Arc}; |
| use sys::thread as imp; |
| use sys_common::thread_info; |
| use sys_common::unwind; |
| use sys_common::util; |
| use sys_common::{AsInner, IntoInner}; |
| use time::Duration; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Thread-local storage |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| #[macro_use] mod local; |
| #[macro_use] mod scoped_tls; |
| |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub use self::local::{LocalKey, LocalKeyState}; |
| |
| #[unstable(feature = "scoped_tls", |
| reason = "scoped TLS has yet to have wide enough use to fully \ |
| consider stabilizing its interface", |
| issue = "27715")] |
| pub use self::scoped_tls::ScopedKey; |
| |
| #[unstable(feature = "libstd_thread_internals", issue = "0")] |
| #[cfg(target_thread_local)] |
| #[doc(hidden)] pub use self::local::elf::Key as __ElfLocalKeyInner; |
| #[unstable(feature = "libstd_thread_internals", issue = "0")] |
| #[doc(hidden)] pub use self::local::os::Key as __OsLocalKeyInner; |
| #[unstable(feature = "libstd_thread_internals", issue = "0")] |
| #[doc(hidden)] pub use self::scoped_tls::__KeyInner as __ScopedKeyInner; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Builder |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /// Thread configuration. Provides detailed control over the properties |
| /// and behavior of new threads. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub struct Builder { |
| // A name for the thread-to-be, for identification in panic messages |
| name: Option<String>, |
| // The size of the stack for the spawned thread |
| stack_size: Option<usize>, |
| } |
| |
| impl Builder { |
| /// Generates the base configuration for spawning a thread, from which |
| /// configuration methods can be chained. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn new() -> Builder { |
| Builder { |
| name: None, |
| stack_size: None, |
| } |
| } |
| |
| /// Names the thread-to-be. Currently the name is used for identification |
| /// only in panic messages. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn name(mut self, name: String) -> Builder { |
| self.name = Some(name); |
| self |
| } |
| |
| /// Sets the size of the stack for the new thread. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn stack_size(mut self, size: usize) -> Builder { |
| self.stack_size = Some(size); |
| self |
| } |
| |
| /// Spawns a new thread, and returns a join handle for it. |
| /// |
| /// The child thread may outlive the parent (unless the parent thread |
| /// is the main thread; the whole process is terminated when the main |
| /// thread finishes). The join handle can be used to block on |
| /// termination of the child thread, including recovering its panics. |
| /// |
| /// # Errors |
| /// |
| /// Unlike the `spawn` free function, this method yields an |
| /// `io::Result` to capture any failure to create the thread at |
| /// the OS level. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn spawn<F, T>(self, f: F) -> io::Result<JoinHandle<T>> where |
| F: FnOnce() -> T, F: Send + 'static, T: Send + 'static |
| { |
| let Builder { name, stack_size } = self; |
| |
| let stack_size = stack_size.unwrap_or(util::min_stack()); |
| |
| let my_thread = Thread::new(name); |
| let their_thread = my_thread.clone(); |
| |
| let my_packet : Arc<UnsafeCell<Option<Result<T>>>> |
| = Arc::new(UnsafeCell::new(None)); |
| let their_packet = my_packet.clone(); |
| |
| let main = move || { |
| if let Some(name) = their_thread.name() { |
| imp::Thread::set_name(name); |
| } |
| unsafe { |
| thread_info::set(imp::guard::current(), their_thread); |
| let mut output = None; |
| let try_result = { |
| let ptr = &mut output; |
| unwind::try(move || *ptr = Some(f())) |
| }; |
| *their_packet.get() = Some(try_result.map(|()| { |
| output.unwrap() |
| })); |
| } |
| }; |
| |
| Ok(JoinHandle(JoinInner { |
| native: unsafe { |
| Some(try!(imp::Thread::new(stack_size, Box::new(main)))) |
| }, |
| thread: my_thread, |
| packet: Packet(my_packet), |
| })) |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Free functions |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /// Spawns a new thread, returning a `JoinHandle` for it. |
| /// |
| /// The join handle will implicitly *detach* the child thread upon being |
| /// dropped. In this case, the child thread may outlive the parent (unless |
| /// the parent thread is the main thread; the whole process is terminated when |
| /// the main thread finishes.) Additionally, the join handle provides a `join` |
| /// method that can be used to join the child thread. If the child thread |
| /// panics, `join` will return an `Err` containing the argument given to |
| /// `panic`. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the OS fails to create a thread; use `Builder::spawn` |
| /// to recover from such errors. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn spawn<F, T>(f: F) -> JoinHandle<T> where |
| F: FnOnce() -> T, F: Send + 'static, T: Send + 'static |
| { |
| Builder::new().spawn(f).unwrap() |
| } |
| |
| /// Gets a handle to the thread that invokes it. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn current() -> Thread { |
| thread_info::current_thread().expect("use of std::thread::current() is not \ |
| possible after the thread's local \ |
| data has been destroyed") |
| } |
| |
| /// Cooperatively gives up a timeslice to the OS scheduler. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn yield_now() { |
| imp::Thread::yield_now() |
| } |
| |
| /// Determines whether the current thread is unwinding because of panic. |
| #[inline] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn panicking() -> bool { |
| unwind::panicking() |
| } |
| |
| /// Invokes a closure, capturing the cause of panic if one occurs. |
| /// |
| /// This function will return `Ok` with the closure's result if the closure |
| /// does not panic, and will return `Err(cause)` if the closure panics. The |
| /// `cause` returned is the object with which panic was originally invoked. |
| /// |
| /// It is currently undefined behavior to unwind from Rust code into foreign |
| /// code, so this function is particularly useful when Rust is called from |
| /// another language (normally C). This can run arbitrary Rust code, capturing a |
| /// panic and allowing a graceful handling of the error. |
| /// |
| /// It is **not** recommended to use this function for a general try/catch |
| /// mechanism. The `Result` type is more appropriate to use for functions that |
| /// can fail on a regular basis. |
| /// |
| /// The closure provided is required to adhere to the `'static` bound to ensure |
| /// that it cannot reference data in the parent stack frame, mitigating problems |
| /// with exception safety. Furthermore, a `Send` bound is also required, |
| /// providing the same safety guarantees as `thread::spawn` (ensuring the |
| /// closure is properly isolated from the parent). |
| #[unstable(feature = "catch_panic", reason = "recent API addition", |
| issue = "27719")] |
| #[rustc_deprecated(since = "1.6.0", reason = "renamed to std::panic::recover")] |
| pub fn catch_panic<F, R>(f: F) -> Result<R> |
| where F: FnOnce() -> R + Send + 'static |
| { |
| let mut result = None; |
| unsafe { |
| let result = &mut result; |
| try!(unwind::try(move || *result = Some(f()))) |
| } |
| Ok(result.unwrap()) |
| } |
| |
| /// Puts the current thread to sleep for the specified amount of time. |
| /// |
| /// The thread may sleep longer than the duration specified due to scheduling |
| /// specifics or platform-dependent functionality. Note that on unix platforms |
| /// this function will not return early due to a signal being received or a |
| /// spurious wakeup. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_deprecated(since = "1.6.0", reason = "replaced by `std::thread::sleep`")] |
| pub fn sleep_ms(ms: u32) { |
| sleep(Duration::from_millis(ms as u64)) |
| } |
| |
| /// Puts the current thread to sleep for the specified amount of time. |
| /// |
| /// The thread may sleep longer than the duration specified due to scheduling |
| /// specifics or platform-dependent functionality. |
| /// |
| /// # Platform behavior |
| /// |
| /// On Unix platforms this function will not return early due to a |
| /// signal being received or a spurious wakeup. Platforms which do not support |
| /// nanosecond precision for sleeping will have `dur` rounded up to the nearest |
| /// granularity of time they can sleep for. |
| #[stable(feature = "thread_sleep", since = "1.4.0")] |
| pub fn sleep(dur: Duration) { |
| imp::Thread::sleep(dur) |
| } |
| |
| /// Blocks unless or until the current thread's token is made available. |
| /// |
| /// Every thread is equipped with some basic low-level blocking support, via |
| /// the `park()` function and the [`unpark()`][unpark] method. These can be |
| /// used as a more CPU-efficient implementation of a spinlock. |
| /// |
| /// [unpark]: struct.Thread.html#method.unpark |
| /// |
| /// The API is typically used by acquiring a handle to the current thread, |
| /// placing that handle in a shared data structure so that other threads can |
| /// find it, and then parking (in a loop with a check for the token actually |
| /// being acquired). |
| /// |
| /// A call to `park` does not guarantee that the thread will remain parked |
| /// forever, and callers should be prepared for this possibility. |
| /// |
| /// See the [module documentation][thread] for more detail. |
| /// |
| /// [thread]: index.html |
| // |
| // The implementation currently uses the trivial strategy of a Mutex+Condvar |
| // with wakeup flag, which does not actually allow spurious wakeups. In the |
| // future, this will be implemented in a more efficient way, perhaps along the lines of |
| // http://cr.openjdk.java.net/~stefank/6989984.1/raw_files/new/src/os/linux/vm/os_linux.cpp |
| // or futuxes, and in either case may allow spurious wakeups. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn park() { |
| let thread = current(); |
| let mut guard = thread.inner.lock.lock().unwrap(); |
| while !*guard { |
| guard = thread.inner.cvar.wait(guard).unwrap(); |
| } |
| *guard = false; |
| } |
| |
| /// Blocks unless or until the current thread's token is made available or |
| /// the specified duration has been reached (may wake spuriously). |
| /// |
| /// The semantics of this function are equivalent to `park()` except that the |
| /// thread will be blocked for roughly no longer than *ms*. This method |
| /// should not be used for precise timing due to anomalies such as |
| /// preemption or platform differences that may not cause the maximum |
| /// amount of time waited to be precisely *ms* long. |
| /// |
| /// See the module doc for more detail. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| #[rustc_deprecated(since = "1.6.0", reason = "replaced by `std::thread::park_timeout`")] |
| pub fn park_timeout_ms(ms: u32) { |
| park_timeout(Duration::from_millis(ms as u64)) |
| } |
| |
| /// Blocks unless or until the current thread's token is made available or |
| /// the specified duration has been reached (may wake spuriously). |
| /// |
| /// The semantics of this function are equivalent to `park()` except that the |
| /// thread will be blocked for roughly no longer than *dur*. This method |
| /// should not be used for precise timing due to anomalies such as |
| /// preemption or platform differences that may not cause the maximum |
| /// amount of time waited to be precisely *dur* long. |
| /// |
| /// See the module doc for more detail. |
| /// |
| /// # Platform behavior |
| /// |
| /// Platforms which do not support nanosecond precision for sleeping will have |
| /// `dur` rounded up to the nearest granularity of time they can sleep for. |
| #[stable(feature = "park_timeout", since = "1.4.0")] |
| pub fn park_timeout(dur: Duration) { |
| let thread = current(); |
| let mut guard = thread.inner.lock.lock().unwrap(); |
| if !*guard { |
| let (g, _) = thread.inner.cvar.wait_timeout(guard, dur).unwrap(); |
| guard = g; |
| } |
| *guard = false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Thread |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /// The internal representation of a `Thread` handle |
| struct Inner { |
| name: Option<String>, |
| lock: Mutex<bool>, // true when there is a buffered unpark |
| cvar: Condvar, |
| } |
| |
| #[derive(Clone)] |
| #[stable(feature = "rust1", since = "1.0.0")] |
| /// A handle to a thread. |
| pub struct Thread { |
| inner: Arc<Inner>, |
| } |
| |
| impl Thread { |
| // Used only internally to construct a thread object without spawning |
| fn new(name: Option<String>) -> Thread { |
| Thread { |
| inner: Arc::new(Inner { |
| name: name, |
| lock: Mutex::new(false), |
| cvar: Condvar::new(), |
| }) |
| } |
| } |
| |
| /// Atomically makes the handle's token available if it is not already. |
| /// |
| /// See the module doc for more detail. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn unpark(&self) { |
| let mut guard = self.inner.lock.lock().unwrap(); |
| if !*guard { |
| *guard = true; |
| self.inner.cvar.notify_one(); |
| } |
| } |
| |
| /// Gets the thread's name. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn name(&self) -> Option<&str> { |
| self.inner.name.as_ref().map(|s| &**s) |
| } |
| } |
| |
| #[stable(feature = "rust1", since = "1.0.0")] |
| impl fmt::Debug for Thread { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| fmt::Debug::fmt(&self.name(), f) |
| } |
| } |
| |
| // a hack to get around privacy restrictions |
| impl thread_info::NewThread for Thread { |
| fn new(name: Option<String>) -> Thread { Thread::new(name) } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // JoinHandle |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /// Indicates the manner in which a thread exited. |
| /// |
| /// A thread that completes without panicking is considered to exit successfully. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub type Result<T> = ::result::Result<T, Box<Any + Send + 'static>>; |
| |
| // This packet is used to communicate the return value between the child thread |
| // and the parent thread. Memory is shared through the `Arc` within and there's |
| // no need for a mutex here because synchronization happens with `join()` (the |
| // parent thread never reads this packet until the child has exited). |
| // |
| // This packet itself is then stored into a `JoinInner` which in turns is placed |
| // in `JoinHandle` and `JoinGuard`. Due to the usage of `UnsafeCell` we need to |
| // manually worry about impls like Send and Sync. The type `T` should |
| // already always be Send (otherwise the thread could not have been created) and |
| // this type is inherently Sync because no methods take &self. Regardless, |
| // however, we add inheriting impls for Send/Sync to this type to ensure it's |
| // Send/Sync and that future modifications will still appropriately classify it. |
| struct Packet<T>(Arc<UnsafeCell<Option<Result<T>>>>); |
| |
| unsafe impl<T: Send> Send for Packet<T> {} |
| unsafe impl<T: Sync> Sync for Packet<T> {} |
| |
| /// Inner representation for JoinHandle |
| struct JoinInner<T> { |
| native: Option<imp::Thread>, |
| thread: Thread, |
| packet: Packet<T>, |
| } |
| |
| impl<T> JoinInner<T> { |
| fn join(&mut self) -> Result<T> { |
| self.native.take().unwrap().join(); |
| unsafe { |
| (*self.packet.0.get()).take().unwrap() |
| } |
| } |
| } |
| |
| /// An owned permission to join on a thread (block on its termination). |
| /// |
| /// A `JoinHandle` *detaches* the child thread when it is dropped. |
| /// |
| /// Due to platform restrictions, it is not possible to `Clone` this |
| /// handle: the ability to join a child thread is a uniquely-owned |
| /// permission. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub struct JoinHandle<T>(JoinInner<T>); |
| |
| impl<T> JoinHandle<T> { |
| /// Extracts a handle to the underlying thread |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn thread(&self) -> &Thread { |
| &self.0.thread |
| } |
| |
| /// Waits for the associated thread to finish. |
| /// |
| /// If the child thread panics, `Err` is returned with the parameter given |
| /// to `panic`. |
| #[stable(feature = "rust1", since = "1.0.0")] |
| pub fn join(mut self) -> Result<T> { |
| self.0.join() |
| } |
| } |
| |
| impl<T> AsInner<imp::Thread> for JoinHandle<T> { |
| fn as_inner(&self) -> &imp::Thread { self.0.native.as_ref().unwrap() } |
| } |
| |
| impl<T> IntoInner<imp::Thread> for JoinHandle<T> { |
| fn into_inner(self) -> imp::Thread { self.0.native.unwrap() } |
| } |
| |
| fn _assert_sync_and_send() { |
| fn _assert_both<T: Send + Sync>() {} |
| _assert_both::<JoinHandle<()>>(); |
| _assert_both::<Thread>(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Tests |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| #[cfg(test)] |
| mod tests { |
| use prelude::v1::*; |
| |
| use any::Any; |
| use sync::mpsc::{channel, Sender}; |
| use result; |
| use super::{Builder}; |
| use thread; |
| use time::Duration; |
| use u32; |
| |
| // !!! These tests are dangerous. If something is buggy, they will hang, !!! |
| // !!! instead of exiting cleanly. This might wedge the buildbots. !!! |
| |
| #[test] |
| fn test_unnamed_thread() { |
| thread::spawn(move|| { |
| assert!(thread::current().name().is_none()); |
| }).join().ok().unwrap(); |
| } |
| |
| #[test] |
| fn test_named_thread() { |
| Builder::new().name("ada lovelace".to_string()).spawn(move|| { |
| assert!(thread::current().name().unwrap() == "ada lovelace".to_string()); |
| }).unwrap().join().unwrap(); |
| } |
| |
| #[test] |
| fn test_run_basic() { |
| let (tx, rx) = channel(); |
| thread::spawn(move|| { |
| tx.send(()).unwrap(); |
| }); |
| rx.recv().unwrap(); |
| } |
| |
| #[test] |
| fn test_join_panic() { |
| match thread::spawn(move|| { |
| panic!() |
| }).join() { |
| result::Result::Err(_) => (), |
| result::Result::Ok(()) => panic!() |
| } |
| } |
| |
| #[test] |
| fn test_spawn_sched() { |
| use clone::Clone; |
| |
| let (tx, rx) = channel(); |
| |
| fn f(i: i32, tx: Sender<()>) { |
| let tx = tx.clone(); |
| thread::spawn(move|| { |
| if i == 0 { |
| tx.send(()).unwrap(); |
| } else { |
| f(i - 1, tx); |
| } |
| }); |
| |
| } |
| f(10, tx); |
| rx.recv().unwrap(); |
| } |
| |
| #[test] |
| fn test_spawn_sched_childs_on_default_sched() { |
| let (tx, rx) = channel(); |
| |
| thread::spawn(move|| { |
| thread::spawn(move|| { |
| tx.send(()).unwrap(); |
| }); |
| }); |
| |
| rx.recv().unwrap(); |
| } |
| |
| fn avoid_copying_the_body<F>(spawnfn: F) where F: FnOnce(Box<Fn() + Send>) { |
| let (tx, rx) = channel(); |
| |
| let x: Box<_> = box 1; |
| let x_in_parent = (&*x) as *const i32 as usize; |
| |
| spawnfn(Box::new(move|| { |
| let x_in_child = (&*x) as *const i32 as usize; |
| tx.send(x_in_child).unwrap(); |
| })); |
| |
| let x_in_child = rx.recv().unwrap(); |
| assert_eq!(x_in_parent, x_in_child); |
| } |
| |
| #[test] |
| fn test_avoid_copying_the_body_spawn() { |
| avoid_copying_the_body(|v| { |
| thread::spawn(move || v()); |
| }); |
| } |
| |
| #[test] |
| fn test_avoid_copying_the_body_thread_spawn() { |
| avoid_copying_the_body(|f| { |
| thread::spawn(move|| { |
| f(); |
| }); |
| }) |
| } |
| |
| #[test] |
| fn test_avoid_copying_the_body_join() { |
| avoid_copying_the_body(|f| { |
| let _ = thread::spawn(move|| { |
| f() |
| }).join(); |
| }) |
| } |
| |
| #[test] |
| fn test_child_doesnt_ref_parent() { |
| // If the child refcounts the parent thread, this will stack overflow when |
| // climbing the thread tree to dereference each ancestor. (See #1789) |
| // (well, it would if the constant were 8000+ - I lowered it to be more |
| // valgrind-friendly. try this at home, instead..!) |
| const GENERATIONS: u32 = 16; |
| fn child_no(x: u32) -> Box<Fn() + Send> { |
| return Box::new(move|| { |
| if x < GENERATIONS { |
| thread::spawn(move|| child_no(x+1)()); |
| } |
| }); |
| } |
| thread::spawn(|| child_no(0)()); |
| } |
| |
| #[test] |
| fn test_simple_newsched_spawn() { |
| thread::spawn(move || {}); |
| } |
| |
| #[test] |
| fn test_try_panic_message_static_str() { |
| match thread::spawn(move|| { |
| panic!("static string"); |
| }).join() { |
| Err(e) => { |
| type T = &'static str; |
| assert!(e.is::<T>()); |
| assert_eq!(*e.downcast::<T>().unwrap(), "static string"); |
| } |
| Ok(()) => panic!() |
| } |
| } |
| |
| #[test] |
| fn test_try_panic_message_owned_str() { |
| match thread::spawn(move|| { |
| panic!("owned string".to_string()); |
| }).join() { |
| Err(e) => { |
| type T = String; |
| assert!(e.is::<T>()); |
| assert_eq!(*e.downcast::<T>().unwrap(), "owned string".to_string()); |
| } |
| Ok(()) => panic!() |
| } |
| } |
| |
| #[test] |
| fn test_try_panic_message_any() { |
| match thread::spawn(move|| { |
| panic!(box 413u16 as Box<Any + Send>); |
| }).join() { |
| Err(e) => { |
| type T = Box<Any + Send>; |
| assert!(e.is::<T>()); |
| let any = e.downcast::<T>().unwrap(); |
| assert!(any.is::<u16>()); |
| assert_eq!(*any.downcast::<u16>().unwrap(), 413); |
| } |
| Ok(()) => panic!() |
| } |
| } |
| |
| #[test] |
| fn test_try_panic_message_unit_struct() { |
| struct Juju; |
| |
| match thread::spawn(move|| { |
| panic!(Juju) |
| }).join() { |
| Err(ref e) if e.is::<Juju>() => {} |
| Err(_) | Ok(()) => panic!() |
| } |
| } |
| |
| #[test] |
| fn test_park_timeout_unpark_before() { |
| for _ in 0..10 { |
| thread::current().unpark(); |
| thread::park_timeout(Duration::from_millis(u32::MAX as u64)); |
| } |
| } |
| |
| #[test] |
| fn test_park_timeout_unpark_not_called() { |
| for _ in 0..10 { |
| thread::park_timeout(Duration::from_millis(10)); |
| } |
| } |
| |
| #[test] |
| fn test_park_timeout_unpark_called_other_thread() { |
| for _ in 0..10 { |
| let th = thread::current(); |
| |
| let _guard = thread::spawn(move || { |
| super::sleep(Duration::from_millis(50)); |
| th.unpark(); |
| }); |
| |
| thread::park_timeout(Duration::from_millis(u32::MAX as u64)); |
| } |
| } |
| |
| #[test] |
| fn sleep_ms_smoke() { |
| thread::sleep(Duration::from_millis(2)); |
| } |
| |
| // NOTE: the corresponding test for stderr is in run-pass/thread-stderr, due |
| // to the test harness apparently interfering with stderr configuration. |
| } |