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Diffstat (limited to 'src/libstd/thread.rs')
| -rw-r--r-- | src/libstd/thread.rs | 960 |
1 files changed, 0 insertions, 960 deletions
diff --git a/src/libstd/thread.rs b/src/libstd/thread.rs deleted file mode 100644 index ab74442cac9..00000000000 --- a/src/libstd/thread.rs +++ /dev/null @@ -1,960 +0,0 @@ -// 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. -//! -//! ## Scoped threads -//! -//! Often a parent thread uses a child thread to perform some particular task, -//! and at some point must wait for the child to complete before continuing. -//! For this scenario, use the `thread::scoped` function: -//! -//! ```rust -//! use std::thread; -//! -//! let guard = thread::scoped(move || { -//! // some work here -//! }); -//! -//! // do some other work in the meantime -//! let output = guard.join(); -//! ``` -//! -//! The `scoped` function doesn't return a `Thread` directly; instead, -//! it returns a *join guard*. The join guard is an RAII-style guard -//! that will automatically join the child thread (block until it -//! terminates) when it is dropped. You can join the child thread in -//! advance by calling the `join` method on the guard, which will also -//! return the result produced by the thread. A handle to the thread -//! itself is available via the `thread` method of the join guard. -//! -//! ## Configuring threads -//! -//! A new thread can be configured before it is spawned via the `Builder` type, -//! which currently allows you to set the name, stack size, and writers for -//! `println!` and `panic!` for the child thread: -//! -//! ```rust -//! 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. - -#![stable(feature = "rust1", since = "1.0.0")] - -use prelude::v1::*; - -use any::Any; -use cell::UnsafeCell; -use fmt; -use io; -use marker::PhantomData; -use rt::{self, unwind}; -use sync::{Mutex, Condvar, Arc}; -use sys::thread as imp; -use sys_common::{stack, thread_info}; -use thunk::Thunk; -use time::Duration; - -#[allow(deprecated)] use old_io::Writer; - -/// 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 { - /// Generate 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, - } - } - - /// Name 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 - } - - /// Set 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 - } - - /// Redirect thread-local stdout. - #[unstable(feature = "std_misc", - reason = "Will likely go away after proc removal")] - #[deprecated(since = "1.0.0", - reason = "the old I/O module is deprecated and this function \ - will be removed with no replacement")] - #[allow(deprecated)] - pub fn stdout(self, _stdout: Box<Writer + Send + 'static>) -> Builder { - self - } - - /// Redirect thread-local stderr. - #[unstable(feature = "std_misc", - reason = "Will likely go away after proc removal")] - #[deprecated(since = "1.0.0", - reason = "the old I/O module is deprecated and this function \ - will be removed with no replacement")] - #[allow(deprecated)] - pub fn stderr(self, _stderr: Box<Writer + Send + 'static>) -> Builder { - self - } - - /// Spawn a new thread, and return 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>(self, f: F) -> io::Result<JoinHandle> where - F: FnOnce(), F: Send + 'static - { - self.spawn_inner(Thunk::new(f)).map(|i| JoinHandle(i)) - } - - /// Spawn a new child thread that must be joined within a given - /// scope, and return a `JoinGuard`. - /// - /// The join guard can be used to explicitly join the child thread (via - /// `join`), returning `Result<T>`, or it will implicitly join the child - /// upon being dropped. Because the child thread may refer to data on the - /// current thread's stack (hence the "scoped" name), it cannot be detached; - /// it *must* be joined before the relevant stack frame is popped. See the - /// module documentation for additional details. - /// - /// # Errors - /// - /// Unlike the `scoped` 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 scoped<'a, T, F>(self, f: F) -> io::Result<JoinGuard<'a, T>> where - T: Send + 'a, F: FnOnce() -> T, F: Send + 'a - { - self.spawn_inner(Thunk::new(f)).map(|inner| { - JoinGuard { inner: inner, _marker: PhantomData } - }) - } - - fn spawn_inner<T: Send>(self, f: Thunk<(), T>) -> io::Result<JoinInner<T>> { - let Builder { name, stack_size } = self; - - let stack_size = stack_size.unwrap_or(rt::min_stack()); - - let my_thread = Thread::new(name); - let their_thread = my_thread.clone(); - - let my_packet = Packet(Arc::new(UnsafeCell::new(None))); - let their_packet = Packet(my_packet.0.clone()); - - // Spawning a new OS thread guarantees that __morestack will never get - // triggered, but we must manually set up the actual stack bounds once - // this function starts executing. This raises the lower limit by a bit - // because by the time that this function is executing we've already - // consumed at least a little bit of stack (we don't know the exact byte - // address at which our stack started). - let main = move || { - let something_around_the_top_of_the_stack = 1; - let addr = &something_around_the_top_of_the_stack as *const i32; - let my_stack_top = addr as usize; - let my_stack_bottom = my_stack_top - stack_size + 1024; - unsafe { - if let Some(name) = their_thread.name() { - imp::set_name(name); - } - stack::record_os_managed_stack_bounds(my_stack_bottom, - my_stack_top); - thread_info::set(imp::guard::current(), their_thread); - } - - let mut output = None; - let try_result = { - let ptr = &mut output; - - // There are two primary reasons that general try/catch is - // unsafe. The first is that we do not support nested - // try/catch. The fact that this is happening in a newly-spawned - // thread suffices. The second is that unwinding while unwinding - // is not defined. We take care of that by having an - // 'unwinding' flag in the thread itself. For these reasons, - // this unsafety should be ok. - unsafe { - unwind::try(move || *ptr = Some(f.invoke(()))) - } - }; - unsafe { - *their_packet.0.get() = Some(match (output, try_result) { - (Some(data), Ok(_)) => Ok(data), - (None, Err(cause)) => Err(cause), - _ => unreachable!() - }); - } - }; - - Ok(JoinInner { - native: try!(unsafe { imp::create(stack_size, Thunk::new(main)) }), - thread: my_thread, - packet: my_packet, - joined: false, - }) - } -} - -/// Spawn 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 -/// -/// Panicks 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>(f: F) -> JoinHandle where F: FnOnce(), F: Send + 'static { - Builder::new().spawn(f).unwrap() -} - -/// Spawn a new *scoped* thread, returning a `JoinGuard` for it. -/// -/// The join guard can be used to explicitly join the child thread (via -/// `join`), returning `Result<T>`, or it will implicitly join the child -/// upon being dropped. Because the child thread may refer to data on the -/// current thread's stack (hence the "scoped" name), it cannot be detached; -/// it *must* be joined before the relevant stack frame is popped. See the -/// module documentation for additional details. -/// -/// # Panics -/// -/// Panicks if the OS fails to create a thread; use `Builder::scoped` -/// to recover from such errors. -#[stable(feature = "rust1", since = "1.0.0")] -pub fn scoped<'a, T, F>(f: F) -> JoinGuard<'a, T> where - T: Send + 'a, F: FnOnce() -> T, F: Send + 'a -{ - Builder::new().scoped(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() -} - -/// Cooperatively give up a timeslice to the OS scheduler. -#[stable(feature = "rust1", since = "1.0.0")] -pub fn yield_now() { - unsafe { imp::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() -} - -/// Put 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. -#[unstable(feature = "thread_sleep", - reason = "recently added, needs an RFC, and `Duration` itself is \ - unstable")] -pub fn sleep(dur: Duration) { - imp::sleep(dur) -} - -/// Block unless or until the current thread's token is made available (may wake spuriously). -/// -/// See the module doc for more detail. -// -// 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; -} - -/// Block 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 *duration*. 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 *duration* long. -/// -/// See the module doc for more detail. -#[unstable(feature = "std_misc", reason = "recently introduced, depends on Duration")] -pub fn park_timeout(duration: Duration) { - let thread = current(); - let mut guard = thread.inner.lock.lock().unwrap(); - if !*guard { - let (g, _) = thread.inner.cvar.wait_timeout(guard, duration).unwrap(); - guard = g; - } - *guard = false; -} - -/// The internal representation of a `Thread` handle -struct Inner { - name: Option<String>, - lock: Mutex<bool>, // true when there is a buffered unpark - cvar: Condvar, -} - -unsafe impl Sync for Inner {} - -#[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(), - }) - } - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[unstable(feature = "std_misc", - reason = "may change with specifics of new Send semantics")] - pub fn spawn<F>(f: F) -> Thread where F: FnOnce(), F: Send + 'static { - Builder::new().spawn(f).unwrap().thread().clone() - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[unstable(feature = "std_misc", - reason = "may change with specifics of new Send semantics")] - pub fn scoped<'a, T, F>(f: F) -> JoinGuard<'a, T> where - T: Send + 'a, F: FnOnce() -> T, F: Send + 'a - { - Builder::new().scoped(f).unwrap() - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[stable(feature = "rust1", since = "1.0.0")] - pub fn current() -> Thread { - thread_info::current_thread() - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[unstable(feature = "std_misc", reason = "name may change")] - pub fn yield_now() { - unsafe { imp::yield_now() } - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[inline] - #[stable(feature = "rust1", since = "1.0.0")] - pub fn panicking() -> bool { - unwind::panicking() - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[unstable(feature = "std_misc", reason = "recently introduced")] - 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; - } - - /// Deprecated: use module-level free function. - #[deprecated(since = "1.0.0", reason = "use module-level free function")] - #[unstable(feature = "std_misc", reason = "recently introduced")] - pub fn park_timeout(duration: Duration) { - let thread = current(); - let mut guard = thread.inner.lock.lock().unwrap(); - if !*guard { - let (g, _) = thread.inner.cvar.wait_timeout(guard, duration).unwrap(); - guard = g; - } - *guard = false; - } - - /// 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(); - } - } - - /// Get 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) } -} - -/// 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>>; - -struct Packet<T>(Arc<UnsafeCell<Option<Result<T>>>>); - -unsafe impl<T:Send> Send for Packet<T> {} -unsafe impl<T> Sync for Packet<T> {} - -/// Inner representation for JoinHandle and JoinGuard -struct JoinInner<T> { - native: imp::rust_thread, - thread: Thread, - packet: Packet<T>, - joined: bool, -} - -impl<T> JoinInner<T> { - fn join(&mut self) -> Result<T> { - assert!(!self.joined); - unsafe { imp::join(self.native) }; - self.joined = true; - unsafe { - (*self.packet.0.get()).take().unwrap() - } - } -} - -/// An owned permission to join on a thread (block on its termination). -/// -/// Unlike a `JoinGuard`, a `JoinHandle` *detaches* the child thread -/// when it is dropped, rather than automatically joining on drop. -/// -/// 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(JoinInner<()>); - -impl JoinHandle { - /// Extract a handle to the underlying thread - #[stable(feature = "rust1", since = "1.0.0")] - pub fn thread(&self) -> &Thread { - &self.0.thread - } - - /// Wait 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<()> { - self.0.join() - } -} - -#[stable(feature = "rust1", since = "1.0.0")] -impl Drop for JoinHandle { - fn drop(&mut self) { - if !self.0.joined { - unsafe { imp::detach(self.0.native) } - } - } -} - -/// An RAII-style guard that will block until thread termination when dropped. -/// -/// The type `T` is the return type for the thread's main function. -/// -/// Joining on drop is necessary to ensure memory safety when stack -/// data is shared between a parent and child thread. -/// -/// Due to platform restrictions, it is not possible to `Clone` this -/// handle: the ability to join a child thread is a uniquely-owned -/// permission. -#[must_use = "thread will be immediately joined if `JoinGuard` is not used"] -#[stable(feature = "rust1", since = "1.0.0")] -pub struct JoinGuard<'a, T: 'a> { - inner: JoinInner<T>, - _marker: PhantomData<&'a T>, -} - -#[stable(feature = "rust1", since = "1.0.0")] -unsafe impl<'a, T: Send + 'a> Sync for JoinGuard<'a, T> {} - -impl<'a, T: Send + 'a> JoinGuard<'a, T> { - /// Extract a handle to the thread this guard will join on. - #[stable(feature = "rust1", since = "1.0.0")] - pub fn thread(&self) -> &Thread { - &self.inner.thread - } - - /// Wait for the associated thread to finish, returning the result of the thread's - /// calculation. - /// - /// # Panics - /// - /// Panics on the child thread are propagated by panicking the parent. - #[stable(feature = "rust1", since = "1.0.0")] - pub fn join(mut self) -> T { - match self.inner.join() { - Ok(res) => res, - Err(_) => panic!("child thread {:?} panicked", self.thread()), - } - } -} - -#[stable(feature = "rust1", since = "1.0.0")] -impl<T: Send> JoinGuard<'static, T> { - /// Detaches the child thread, allowing it to outlive its parent. - #[deprecated(since = "1.0.0", reason = "use spawn instead")] - #[unstable(feature = "std_misc")] - pub fn detach(mut self) { - unsafe { imp::detach(self.inner.native) }; - self.inner.joined = true; // avoid joining in the destructor - } -} - -#[unsafe_destructor] -#[stable(feature = "rust1", since = "1.0.0")] -impl<'a, T: Send + 'a> Drop for JoinGuard<'a, T> { - fn drop(&mut self) { - if !self.inner.joined { - if self.inner.join().is_err() { - panic!("child thread {:?} panicked", self.thread()); - } - } - } -} - -#[cfg(test)] -mod test { - use prelude::v1::*; - - use any::Any; - use sync::mpsc::{channel, Sender}; - use boxed::BoxAny; - use result; - use std::old_io::{ChanReader, ChanWriter}; - use super::{Builder}; - use thread; - use thunk::Thunk; - use time::Duration; - - // !!! 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()).scoped(move|| { - assert!(thread::current().name().unwrap() == "ada lovelace".to_string()); - }).unwrap().join(); - } - - #[test] - fn test_run_basic() { - let (tx, rx) = channel(); - thread::spawn(move|| { - tx.send(()).unwrap(); - }); - rx.recv().unwrap(); - } - - #[test] - fn test_join_success() { - assert!(thread::scoped(move|| -> String { - "Success!".to_string() - }).join() == "Success!"); - } - - #[test] - fn test_join_panic() { - match thread::spawn(move|| { - panic!() - }).join() { - result::Result::Err(_) => (), - result::Result::Ok(()) => panic!() - } - } - - #[test] - fn test_scoped_success() { - let res = thread::scoped(move|| -> String { - "Success!".to_string() - }).join(); - assert!(res == "Success!"); - } - - #[test] - #[should_fail] - fn test_scoped_panic() { - thread::scoped(|| panic!()).join(); - } - - #[test] - #[should_fail] - fn test_scoped_implicit_panic() { - let _ = thread::scoped(|| 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(Thunk<'static>) { - let (tx, rx) = channel(); - - let x: Box<_> = box 1; - let x_in_parent = (&*x) as *const i32 as usize; - - spawnfn(Thunk::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.invoke(())); - }); - } - - #[test] - fn test_avoid_copying_the_body_thread_spawn() { - avoid_copying_the_body(|f| { - thread::spawn(move|| { - f.invoke(()); - }); - }) - } - - #[test] - fn test_avoid_copying_the_body_join() { - avoid_copying_the_body(|f| { - let _ = thread::spawn(move|| { - f.invoke(()) - }).join(); - }) - } - - #[test] - fn test_child_doesnt_ref_parent() { - // If the child refcounts the parent task, this will stack overflow when - // climbing the task 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) -> Thunk<'static> { - return Thunk::new(move|| { - if x < GENERATIONS { - thread::spawn(move|| child_no(x+1).invoke(())); - } - }); - } - thread::spawn(|| child_no(0).invoke(())); - } - - #[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::seconds(10_000_000)); - } - } - - #[test] - fn test_park_timeout_unpark_not_called() { - for _ in 0..10 { - thread::park_timeout(Duration::milliseconds(10)); - } - } - - #[test] - fn test_park_timeout_unpark_called_other_thread() { - use std::old_io; - - for _ in 0..10 { - let th = thread::current(); - - let _guard = thread::spawn(move || { - old_io::timer::sleep(Duration::milliseconds(50)); - th.unpark(); - }); - - thread::park_timeout(Duration::seconds(10_000_000)); - } - } - - #[test] - fn sleep_smoke() { - thread::sleep(Duration::milliseconds(2)); - thread::sleep(Duration::milliseconds(-2)); - } - - // NOTE: the corresponding test for stderr is in run-pass/task-stderr, due - // to the test harness apparently interfering with stderr configuration. -} |