Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 719 insertions, 451 deletions

diff --git a/vendor/tokio/src/signal/ctrl_c.rs b/vendor/tokio/src/signal/ctrl_c.rs
index 1eeeb85aa..b26ab7ead 100644
--- a/vendor/tokio/src/signal/ctrl_c.rs
+++ b/vendor/tokio/src/signal/ctrl_c.rs
@@ -47,6 +47,15 @@ use std::io;
 ///     println!("received ctrl-c event");
 /// }
 /// ```
+///
+/// Listen in the background:
+///
+/// ```rust,no_run
+/// tokio::spawn(async move {
+///     tokio::signal::ctrl_c().await.unwrap();
+///     // Your handler here
+/// });
+/// ```
 pub async fn ctrl_c() -> io::Result<()> {
     os_impl::ctrl_c()?.recv().await;
     Ok(())
diff --git a/vendor/tokio/src/signal/mod.rs b/vendor/tokio/src/signal/mod.rs
index fe572f041..3aacc60ef 100644
--- a/vendor/tokio/src/signal/mod.rs
+++ b/vendor/tokio/src/signal/mod.rs
@@ -1,4 +1,4 @@
-//! Asynchronous signal handling for Tokio
+//! Asynchronous signal handling for Tokio.
 //!
 //! Note that signal handling is in general a very tricky topic and should be
 //! used with great care. This crate attempts to implement 'best practice' for
@@ -48,7 +48,7 @@ use std::task::{Context, Poll};
 mod ctrl_c;
 pub use ctrl_c::ctrl_c;
 
-mod registry;
+pub(crate) mod registry;
 
 mod os {
     #[cfg(unix)]
diff --git a/vendor/tokio/src/signal/registry.rs b/vendor/tokio/src/signal/registry.rs
index 8b89108a6..48e98c832 100644
--- a/vendor/tokio/src/signal/registry.rs
+++ b/vendor/tokio/src/signal/registry.rs
@@ -1,12 +1,10 @@
 #![allow(clippy::unit_arg)]
 
 use crate::signal::os::{OsExtraData, OsStorage};
-
 use crate::sync::watch;
+use crate::util::once_cell::OnceCell;
 
-use once_cell::sync::Lazy;
 use std::ops;
-use std::pin::Pin;
 use std::sync::atomic::{AtomicBool, Ordering};
 
 pub(crate) type EventId = usize;
@@ -152,19 +150,25 @@ impl Globals {
     }
 }
 
-pub(crate) fn globals() -> Pin<&'static Globals>
+fn globals_init() -> Globals
 where
     OsExtraData: 'static + Send + Sync + Init,
     OsStorage: 'static + Send + Sync + Init,
 {
-    static GLOBALS: Lazy<Pin<Box<Globals>>> = Lazy::new(|| {
-        Box::pin(Globals {
-            extra: OsExtraData::init(),
-            registry: Registry::new(OsStorage::init()),
-        })
-    });
-
-    GLOBALS.as_ref()
+    Globals {
+        extra: OsExtraData::init(),
+        registry: Registry::new(OsStorage::init()),
+    }
+}
+
+pub(crate) fn globals() -> &'static Globals
+where
+    OsExtraData: 'static + Send + Sync + Init,
+    OsStorage: 'static + Send + Sync + Init,
+{
+    static GLOBALS: OnceCell<Globals> = OnceCell::new();
+
+    GLOBALS.get(globals_init)
 }
 
 #[cfg(all(test, not(loom)))]
@@ -202,7 +206,12 @@ mod tests {
                 registry.broadcast();
 
                 // Yield so the previous broadcast can get received
-                crate::time::sleep(std::time::Duration::from_millis(10)).await;
+                //
+                // This yields many times since the block_on task is only polled every 61
+                // ticks.
+                for _ in 0..100 {
+                    crate::task::yield_now().await;
+                }
 
                 // Send subsequent signal
                 registry.record_event(0);
@@ -232,7 +241,7 @@ mod tests {
     #[test]
     fn record_invalid_event_does_nothing() {
         let registry = Registry::new(vec![EventInfo::default()]);
-        registry.record_event(42);
+        registry.record_event(1302);
     }
 
     #[test]
@@ -240,17 +249,17 @@ mod tests {
         let registry = Registry::new(vec![EventInfo::default(), EventInfo::default()]);
 
         registry.record_event(0);
-        assert_eq!(false, registry.broadcast());
+        assert!(!registry.broadcast());
 
         let first = registry.register_listener(0);
         let second = registry.register_listener(1);
 
         registry.record_event(0);
-        assert_eq!(true, registry.broadcast());
+        assert!(registry.broadcast());
 
         drop(first);
         registry.record_event(0);
-        assert_eq!(false, registry.broadcast());
+        assert!(!registry.broadcast());
 
         drop(second);
     }
diff --git a/vendor/tokio/src/signal/reusable_box.rs b/vendor/tokio/src/signal/reusable_box.rs
index 426ecb06f..796fa210b 100644
--- a/vendor/tokio/src/signal/reusable_box.rs
+++ b/vendor/tokio/src/signal/reusable_box.rs
@@ -30,7 +30,7 @@ impl<T> ReusableBoxFuture<T> {
         Self { boxed }
     }
 
-    /// Replace the future currently stored in this box.
+    /// Replaces the future currently stored in this box.
     ///
     /// This reallocates if and only if the layout of the provided future is
     /// different from the layout of the currently stored future.
@@ -43,7 +43,7 @@ impl<T> ReusableBoxFuture<T> {
         }
     }
 
-    /// Replace the future currently stored in this box.
+    /// Replaces the future currently stored in this box.
     ///
     /// This function never reallocates, but returns an error if the provided
     /// future has a different size or alignment from the currently stored
@@ -70,7 +70,7 @@ impl<T> ReusableBoxFuture<T> {
         }
     }
 
-    /// Set the current future.
+    /// Sets the current future.
     ///
     /// # Safety
     ///
@@ -103,14 +103,14 @@ impl<T> ReusableBoxFuture<T> {
         }
     }
 
-    /// Get a pinned reference to the underlying future.
+    /// Gets a pinned reference to the underlying future.
     pub(crate) fn get_pin(&mut self) -> Pin<&mut (dyn Future<Output = T> + Send)> {
         // SAFETY: The user of this box cannot move the box, and we do not move it
         // either.
         unsafe { Pin::new_unchecked(self.boxed.as_mut()) }
     }
 
-    /// Poll the future stored inside this box.
+    /// Polls the future stored inside this box.
     pub(crate) fn poll(&mut self, cx: &mut Context<'_>) -> Poll<T> {
         self.get_pin().poll(cx)
     }
@@ -119,7 +119,7 @@ impl<T> ReusableBoxFuture<T> {
 impl<T> Future for ReusableBoxFuture<T> {
     type Output = T;
 
-    /// Poll the future stored inside this box.
+    /// Polls the future stored inside this box.
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
         Pin::into_inner(self).get_pin().poll(cx)
     }
diff --git a/vendor/tokio/src/signal/unix.rs b/vendor/tokio/src/signal/unix.rs
index f96b2f4c2..ae5c13085 100644
--- a/vendor/tokio/src/signal/unix.rs
+++ b/vendor/tokio/src/signal/unix.rs
@@ -4,30 +4,33 @@
 //! `Signal` type for receiving notifications of signals.
 
 #![cfg(unix)]
+#![cfg_attr(docsrs, doc(cfg(all(unix, feature = "signal"))))]
 
+use crate::runtime::scheduler;
+use crate::runtime::signal::Handle;
 use crate::signal::registry::{globals, EventId, EventInfo, Globals, Init, Storage};
 use crate::signal::RxFuture;
 use crate::sync::watch;
 
 use mio::net::UnixStream;
 use std::io::{self, Error, ErrorKind, Write};
-use std::pin::Pin;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Once;
 use std::task::{Context, Poll};
 
-pub(crate) mod driver;
-use self::driver::Handle;
-
 pub(crate) type OsStorage = Vec<SignalInfo>;
 
-// Number of different unix signals
-// (FreeBSD has 33)
-const SIGNUM: usize = 33;
-
 impl Init for OsStorage {
     fn init() -> Self {
-        (0..SIGNUM).map(|_| SignalInfo::default()).collect()
+        // There are reliable signals ranging from 1 to 33 available on every Unix platform.
+        #[cfg(not(target_os = "linux"))]
+        let possible = 0..=33;
+
+        // On Linux, there are additional real-time signals available.
+        #[cfg(target_os = "linux")]
+        let possible = 0..=libc::SIGRTMAX();
+
+        possible.map(|_| SignalInfo::default()).collect()
     }
 }
 
@@ -47,7 +50,7 @@ impl Storage for OsStorage {
 #[derive(Debug)]
 pub(crate) struct OsExtraData {
     sender: UnixStream,
-    receiver: UnixStream,
+    pub(crate) receiver: UnixStream,
 }
 
 impl Init for OsExtraData {
@@ -59,7 +62,7 @@ impl Init for OsExtraData {
 }
 
 /// Represents the specific kind of signal to listen for.
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)]
 pub struct SignalKind(libc::c_int);
 
 impl SignalKind {
@@ -79,15 +82,26 @@ impl SignalKind {
     // unlikely to change to other types, but technically libc can change this
     // in the future minor version.
     // See https://github.com/tokio-rs/tokio/issues/3767 for more.
-    pub fn from_raw(signum: std::os::raw::c_int) -> Self {
+    pub const fn from_raw(signum: std::os::raw::c_int) -> Self {
         Self(signum as libc::c_int)
     }
 
+    /// Get the signal's numeric value.
+    ///
+    /// ```rust
+    /// # use tokio::signal::unix::SignalKind;
+    /// let kind = SignalKind::interrupt();
+    /// assert_eq!(kind.as_raw_value(), libc::SIGINT);
+    /// ```
+    pub const fn as_raw_value(&self) -> std::os::raw::c_int {
+        self.0
+    }
+
     /// Represents the SIGALRM signal.
     ///
     /// On Unix systems this signal is sent when a real-time timer has expired.
     /// By default, the process is terminated by this signal.
-    pub fn alarm() -> Self {
+    pub const fn alarm() -> Self {
         Self(libc::SIGALRM)
     }
 
@@ -95,7 +109,7 @@ impl SignalKind {
     ///
     /// On Unix systems this signal is sent when the status of a child process
     /// has changed. By default, this signal is ignored.
-    pub fn child() -> Self {
+    pub const fn child() -> Self {
         Self(libc::SIGCHLD)
     }
 
@@ -103,7 +117,7 @@ impl SignalKind {
     ///
     /// On Unix systems this signal is sent when the terminal is disconnected.
     /// By default, the process is terminated by this signal.
-    pub fn hangup() -> Self {
+    pub const fn hangup() -> Self {
         Self(libc::SIGHUP)
     }
 
@@ -118,7 +132,7 @@ impl SignalKind {
         target_os = "netbsd",
         target_os = "openbsd"
     ))]
-    pub fn info() -> Self {
+    pub const fn info() -> Self {
         Self(libc::SIGINFO)
     }
 
@@ -126,7 +140,7 @@ impl SignalKind {
     ///
     /// On Unix systems this signal is sent to interrupt a program.
     /// By default, the process is terminated by this signal.
-    pub fn interrupt() -> Self {
+    pub const fn interrupt() -> Self {
         Self(libc::SIGINT)
     }
 
@@ -134,7 +148,7 @@ impl SignalKind {
     ///
     /// On Unix systems this signal is sent when I/O operations are possible
     /// on some file descriptor. By default, this signal is ignored.
-    pub fn io() -> Self {
+    pub const fn io() -> Self {
         Self(libc::SIGIO)
     }
 
@@ -143,7 +157,7 @@ impl SignalKind {
     /// On Unix systems this signal is sent when the process attempts to write
     /// to a pipe which has no reader. By default, the process is terminated by
     /// this signal.
-    pub fn pipe() -> Self {
+    pub const fn pipe() -> Self {
         Self(libc::SIGPIPE)
     }
 
@@ -152,7 +166,7 @@ impl SignalKind {
     /// On Unix systems this signal is sent to issue a shutdown of the
     /// process, after which the OS will dump the process core.
     /// By default, the process is terminated by this signal.
-    pub fn quit() -> Self {
+    pub const fn quit() -> Self {
         Self(libc::SIGQUIT)
     }
 
@@ -160,7 +174,7 @@ impl SignalKind {
     ///
     /// On Unix systems this signal is sent to issue a shutdown of the
     /// process. By default, the process is terminated by this signal.
-    pub fn terminate() -> Self {
+    pub const fn terminate() -> Self {
         Self(libc::SIGTERM)
     }
 
@@ -168,7 +182,7 @@ impl SignalKind {
     ///
     /// On Unix systems this is a user defined signal.
     /// By default, the process is terminated by this signal.
-    pub fn user_defined1() -> Self {
+    pub const fn user_defined1() -> Self {
         Self(libc::SIGUSR1)
     }
 
@@ -176,7 +190,7 @@ impl SignalKind {
     ///
     /// On Unix systems this is a user defined signal.
     /// By default, the process is terminated by this signal.
-    pub fn user_defined2() -> Self {
+    pub const fn user_defined2() -> Self {
         Self(libc::SIGUSR2)
     }
 
@@ -184,11 +198,23 @@ impl SignalKind {
     ///
     /// On Unix systems this signal is sent when the terminal window is resized.
     /// By default, this signal is ignored.
-    pub fn window_change() -> Self {
+    pub const fn window_change() -> Self {
         Self(libc::SIGWINCH)
     }
 }
 
+impl From<std::os::raw::c_int> for SignalKind {
+    fn from(signum: std::os::raw::c_int) -> Self {
+        Self::from_raw(signum as libc::c_int)
+    }
+}
+
+impl From<SignalKind> for std::os::raw::c_int {
+    fn from(kind: SignalKind) -> Self {
+        kind.as_raw_value()
+    }
+}
+
 pub(crate) struct SignalInfo {
     event_info: EventInfo,
     init: Once,
@@ -213,7 +239,7 @@ impl Default for SignalInfo {
 /// 2. Wake up the driver by writing a byte to a pipe
 ///
 /// Those two operations should both be async-signal safe.
-fn action(globals: Pin<&'static Globals>, signal: libc::c_int) {
+fn action(globals: &'static Globals, signal: libc::c_int) {
     globals.record_event(signal as EventId);
 
     // Send a wakeup, ignore any errors (anything reasonably possible is
@@ -266,7 +292,11 @@ fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> {
     }
 }
 
-/// A stream of events for receiving a particular type of OS signal.
+/// An listener for receiving a particular type of OS signal.
+///
+/// The listener can be turned into a `Stream` using [`SignalStream`].
+///
+/// [`SignalStream`]: https://docs.rs/tokio-stream/latest/tokio_stream/wrappers/struct.SignalStream.html
 ///
 /// In general signal handling on Unix is a pretty tricky topic, and this
 /// structure is no exception! There are some important limitations to keep in
@@ -281,7 +311,7 @@ fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> {
 ///   Once `poll` has been called, however, a further signal is guaranteed to
 ///   be yielded as an item.
 ///
-///   Put another way, any element pulled off the returned stream corresponds to
+///   Put another way, any element pulled off the returned listener corresponds to
 ///   *at least one* signal, but possibly more.
 ///
 /// * Signal handling in general is relatively inefficient. Although some
@@ -319,11 +349,11 @@ fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> {
 /// #[tokio::main]
 /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
 ///     // An infinite stream of hangup signals.
-///     let mut stream = signal(SignalKind::hangup())?;
+///     let mut sig = signal(SignalKind::hangup())?;
 ///
 ///     // Print whenever a HUP signal is received
 ///     loop {
-///         stream.recv().await;
+///         sig.recv().await;
 ///         println!("got signal HUP");
 ///     }
 /// }
@@ -334,7 +364,7 @@ pub struct Signal {
     inner: RxFuture,
 }
 
-/// Creates a new stream which will receive notifications when the current
+/// Creates a new listener which will receive notifications when the current
 /// process receives the specified signal `kind`.
 ///
 /// This function will create a new stream which binds to the default reactor.
@@ -356,8 +386,15 @@ pub struct Signal {
 /// * If the previous initialization of this specific signal failed.
 /// * If the signal is one of
 ///   [`signal_hook::FORBIDDEN`](fn@signal_hook_registry::register#panics)
+///
+/// # Panics
+///
+/// This function panics if there is no current reactor set, or if the `rt`
+/// feature flag is not enabled.
+#[track_caller]
 pub fn signal(kind: SignalKind) -> io::Result<Signal> {
-    let rx = signal_with_handle(kind, &Handle::current())?;
+    let handle = scheduler::Handle::current();
+    let rx = signal_with_handle(kind, handle.driver().signal())?;
 
     Ok(Signal {
         inner: RxFuture::new(rx),
@@ -379,6 +416,12 @@ impl Signal {
     ///
     /// `None` is returned if no more events can be received by this stream.
     ///
+    /// # Cancel safety
+    ///
+    /// This method is cancel safe. If you use it as the event in a
+    /// [`tokio::select!`](crate::select) statement and some other branch
+    /// completes first, then it is guaranteed that no signal is lost.
+    ///
     /// # Examples
     ///
     /// Wait for SIGHUP
@@ -473,4 +516,15 @@ mod tests {
         )
         .unwrap_err();
     }
+
+    #[test]
+    fn from_c_int() {
+        assert_eq!(SignalKind::from(2), SignalKind::interrupt());
+    }
+
+    #[test]
+    fn into_c_int() {
+        let value: std::os::raw::c_int = SignalKind::interrupt().into();
+        assert_eq!(value, libc::SIGINT as _);
+    }
 }
diff --git a/vendor/tokio/src/signal/unix/driver.rs b/vendor/tokio/src/signal/unix/driver.rs
deleted file mode 100644
index 5fe7c354c..000000000
--- a/vendor/tokio/src/signal/unix/driver.rs
+++ /dev/null
@@ -1,207 +0,0 @@
-#![cfg_attr(not(feature = "rt"), allow(dead_code))]
-
-//! Signal driver
-
-use crate::io::driver::{Driver as IoDriver, Interest};
-use crate::io::PollEvented;
-use crate::park::Park;
-use crate::signal::registry::globals;
-
-use mio::net::UnixStream;
-use std::io::{self, Read};
-use std::ptr;
-use std::sync::{Arc, Weak};
-use std::task::{Context, Poll, RawWaker, RawWakerVTable, Waker};
-use std::time::Duration;
-
-/// Responsible for registering wakeups when an OS signal is received, and
-/// subsequently dispatching notifications to any signal listeners as appropriate.
-///
-/// Note: this driver relies on having an enabled IO driver in order to listen to
-/// pipe write wakeups.
-#[derive(Debug)]
-pub(crate) struct Driver {
-    /// Thread parker. The `Driver` park implementation delegates to this.
-    park: IoDriver,
-
-    /// A pipe for receiving wake events from the signal handler
-    receiver: PollEvented<UnixStream>,
-
-    /// Shared state
-    inner: Arc<Inner>,
-}
-
-#[derive(Clone, Debug, Default)]
-pub(crate) struct Handle {
-    inner: Weak<Inner>,
-}
-
-#[derive(Debug)]
-pub(super) struct Inner(());
-
-// ===== impl Driver =====
-
-impl Driver {
-    /// Creates a new signal `Driver` instance that delegates wakeups to `park`.
-    pub(crate) fn new(park: IoDriver) -> io::Result<Self> {
-        use std::mem::ManuallyDrop;
-        use std::os::unix::io::{AsRawFd, FromRawFd};
-
-        // NB: We give each driver a "fresh" receiver file descriptor to avoid
-        // the issues described in alexcrichton/tokio-process#42.
-        //
-        // In the past we would reuse the actual receiver file descriptor and
-        // swallow any errors around double registration of the same descriptor.
-        // I'm not sure if the second (failed) registration simply doesn't end
-        // up receiving wake up notifications, or there could be some race
-        // condition when consuming readiness events, but having distinct
-        // descriptors for distinct PollEvented instances appears to mitigate
-        // this.
-        //
-        // Unfortunately we cannot just use a single global PollEvented instance
-        // either, since we can't compare Handles or assume they will always
-        // point to the exact same reactor.
-        //
-        // Mio 0.7 removed `try_clone()` as an API due to unexpected behavior
-        // with registering dups with the same reactor. In this case, duping is
-        // safe as each dup is registered with separate reactors **and** we
-        // only expect at least one dup to receive the notification.
-
-        // Manually drop as we don't actually own this instance of UnixStream.
-        let receiver_fd = globals().receiver.as_raw_fd();
-
-        // safety: there is nothing unsafe about this, but the `from_raw_fd` fn is marked as unsafe.
-        let original =
-            ManuallyDrop::new(unsafe { std::os::unix::net::UnixStream::from_raw_fd(receiver_fd) });
-        let receiver = UnixStream::from_std(original.try_clone()?);
-        let receiver = PollEvented::new_with_interest_and_handle(
-            receiver,
-            Interest::READABLE | Interest::WRITABLE,
-            park.handle(),
-        )?;
-
-        Ok(Self {
-            park,
-            receiver,
-            inner: Arc::new(Inner(())),
-        })
-    }
-
-    /// Returns a handle to this event loop which can be sent across threads
-    /// and can be used as a proxy to the event loop itself.
-    pub(crate) fn handle(&self) -> Handle {
-        Handle {
-            inner: Arc::downgrade(&self.inner),
-        }
-    }
-
-    fn process(&self) {
-        // Check if the pipe is ready to read and therefore has "woken" us up
-        //
-        // To do so, we will `poll_read_ready` with a noop waker, since we don't
-        // need to actually be notified when read ready...
-        let waker = unsafe { Waker::from_raw(RawWaker::new(ptr::null(), &NOOP_WAKER_VTABLE)) };
-        let mut cx = Context::from_waker(&waker);
-
-        let ev = match self.receiver.registration().poll_read_ready(&mut cx) {
-            Poll::Ready(Ok(ev)) => ev,
-            Poll::Ready(Err(e)) => panic!("reactor gone: {}", e),
-            Poll::Pending => return, // No wake has arrived, bail
-        };
-
-        // Drain the pipe completely so we can receive a new readiness event
-        // if another signal has come in.
-        let mut buf = [0; 128];
-        loop {
-            match (&*self.receiver).read(&mut buf) {
-                Ok(0) => panic!("EOF on self-pipe"),
-                Ok(_) => continue, // Keep reading
-                Err(e) if e.kind() == io::ErrorKind::WouldBlock => break,
-                Err(e) => panic!("Bad read on self-pipe: {}", e),
-            }
-        }
-
-        self.receiver.registration().clear_readiness(ev);
-
-        // Broadcast any signals which were received
-        globals().broadcast();
-    }
-}
-
-const NOOP_WAKER_VTABLE: RawWakerVTable = RawWakerVTable::new(noop_clone, noop, noop, noop);
-
-unsafe fn noop_clone(_data: *const ()) -> RawWaker {
-    RawWaker::new(ptr::null(), &NOOP_WAKER_VTABLE)
-}
-
-unsafe fn noop(_data: *const ()) {}
-
-// ===== impl Park for Driver =====
-
-impl Park for Driver {
-    type Unpark = <IoDriver as Park>::Unpark;
-    type Error = io::Error;
-
-    fn unpark(&self) -> Self::Unpark {
-        self.park.unpark()
-    }
-
-    fn park(&mut self) -> Result<(), Self::Error> {
-        self.park.park()?;
-        self.process();
-        Ok(())
-    }
-
-    fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> {
-        self.park.park_timeout(duration)?;
-        self.process();
-        Ok(())
-    }
-
-    fn shutdown(&mut self) {
-        self.park.shutdown()
-    }
-}
-
-// ===== impl Handle =====
-
-impl Handle {
-    pub(super) fn check_inner(&self) -> io::Result<()> {
-        if self.inner.strong_count() > 0 {
-            Ok(())
-        } else {
-            Err(io::Error::new(io::ErrorKind::Other, "signal driver gone"))
-        }
-    }
-}
-
-cfg_rt! {
-    impl Handle {
-        /// Returns a handle to the current driver
-        ///
-        /// # Panics
-        ///
-        /// This function panics if there is no current signal driver set.
-        pub(super) fn current() -> Self {
-            crate::runtime::context::signal_handle().expect(
-                "there is no signal driver running, must be called from the context of Tokio runtime",
-            )
-        }
-    }
-}
-
-cfg_not_rt! {
-    impl Handle {
-        /// Returns a handle to the current driver
-        ///
-        /// # Panics
-        ///
-        /// This function panics if there is no current signal driver set.
-        pub(super) fn current() -> Self {
-            panic!(
-                "there is no signal driver running, must be called from the context of Tokio runtime or with\
-                `rt` enabled.",
-            )
-        }
-    }
-}
diff --git a/vendor/tokio/src/signal/windows.rs b/vendor/tokio/src/signal/windows.rs
index c231d6268..2f70f98b1 100644
--- a/vendor/tokio/src/signal/windows.rs
+++ b/vendor/tokio/src/signal/windows.rs
@@ -1,133 +1,28 @@
 //! Windows-specific types for signal handling.
 //!
-//! This module is only defined on Windows and allows receiving "ctrl-c"
-//! and "ctrl-break" notifications. These events are listened for via the
-//! `SetConsoleCtrlHandler` function which receives events of the type
-//! `CTRL_C_EVENT` and `CTRL_BREAK_EVENT`.
+//! This module is only defined on Windows and allows receiving "ctrl-c",
+//! "ctrl-break", "ctrl-logoff", "ctrl-shutdown", and "ctrl-close"
+//! notifications. These events are listened for via the `SetConsoleCtrlHandler`
+//! function which receives the corresponding windows_sys event type.
 
-#![cfg(windows)]
+#![cfg(any(windows, docsrs))]
+#![cfg_attr(docsrs, doc(cfg(all(windows, feature = "signal"))))]
 
-use crate::signal::registry::{globals, EventId, EventInfo, Init, Storage};
 use crate::signal::RxFuture;
-
-use std::convert::TryFrom;
 use std::io;
-use std::sync::Once;
 use std::task::{Context, Poll};
-use winapi::shared::minwindef::{BOOL, DWORD, FALSE, TRUE};
-use winapi::um::consoleapi::SetConsoleCtrlHandler;
-use winapi::um::wincon::{CTRL_BREAK_EVENT, CTRL_C_EVENT};
-
-#[derive(Debug)]
-pub(crate) struct OsStorage {
-    ctrl_c: EventInfo,
-    ctrl_break: EventInfo,
-}
 
-impl Init for OsStorage {
-    fn init() -> Self {
-        Self {
-            ctrl_c: EventInfo::default(),
-            ctrl_break: EventInfo::default(),
-        }
-    }
-}
-
-impl Storage for OsStorage {
-    fn event_info(&self, id: EventId) -> Option<&EventInfo> {
-        match DWORD::try_from(id) {
-            Ok(CTRL_C_EVENT) => Some(&self.ctrl_c),
-            Ok(CTRL_BREAK_EVENT) => Some(&self.ctrl_break),
-            _ => None,
-        }
-    }
+#[cfg(not(docsrs))]
+#[path = "windows/sys.rs"]
+mod imp;
+#[cfg(not(docsrs))]
+pub(crate) use self::imp::{OsExtraData, OsStorage};
 
-    fn for_each<'a, F>(&'a self, mut f: F)
-    where
-        F: FnMut(&'a EventInfo),
-    {
-        f(&self.ctrl_c);
-        f(&self.ctrl_break);
-    }
-}
-
-#[derive(Debug)]
-pub(crate) struct OsExtraData {}
-
-impl Init for OsExtraData {
-    fn init() -> Self {
-        Self {}
-    }
-}
+#[cfg(docsrs)]
+#[path = "windows/stub.rs"]
+mod imp;
 
-/// Stream of events discovered via `SetConsoleCtrlHandler`.
-///
-/// This structure can be used to listen for events of the type `CTRL_C_EVENT`
-/// and `CTRL_BREAK_EVENT`. The `Stream` trait is implemented for this struct
-/// and will resolve for each notification received by the process. Note that
-/// there are few limitations with this as well:
-///
-/// * A notification to this process notifies *all* `Event` streams for that
-///   event type.
-/// * Notifications to an `Event` stream **are coalesced** if they aren't
-///   processed quickly enough. This means that if two notifications are
-///   received back-to-back, then the stream may only receive one item about the
-///   two notifications.
-#[must_use = "streams do nothing unless polled"]
-#[derive(Debug)]
-pub(crate) struct Event {
-    inner: RxFuture,
-}
-
-impl Event {
-    fn new(signum: DWORD) -> io::Result<Self> {
-        global_init()?;
-
-        let rx = globals().register_listener(signum as EventId);
-
-        Ok(Self {
-            inner: RxFuture::new(rx),
-        })
-    }
-}
-
-fn global_init() -> io::Result<()> {
-    static INIT: Once = Once::new();
-
-    let mut init = None;
-
-    INIT.call_once(|| unsafe {
-        let rc = SetConsoleCtrlHandler(Some(handler), TRUE);
-        let ret = if rc == 0 {
-            Err(io::Error::last_os_error())
-        } else {
-            Ok(())
-        };
-
-        init = Some(ret);
-    });
-
-    init.unwrap_or_else(|| Ok(()))
-}
-
-unsafe extern "system" fn handler(ty: DWORD) -> BOOL {
-    let globals = globals();
-    globals.record_event(ty as EventId);
-
-    // According to https://docs.microsoft.com/en-us/windows/console/handlerroutine
-    // the handler routine is always invoked in a new thread, thus we don't
-    // have the same restrictions as in Unix signal handlers, meaning we can
-    // go ahead and perform the broadcast here.
-    if globals.broadcast() {
-        TRUE
-    } else {
-        // No one is listening for this notification any more
-        // let the OS fire the next (possibly the default) handler.
-        FALSE
-    }
-}
-
-/// Creates a new stream which receives "ctrl-c" notifications sent to the
+/// Creates a new listener which receives "ctrl-c" notifications sent to the
 /// process.
 ///
 /// # Examples
@@ -137,12 +32,12 @@ unsafe extern "system" fn handler(ty: DWORD) -> BOOL {
 ///
 /// #[tokio::main]
 /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
-///     // An infinite stream of CTRL-C events.
-///     let mut stream = ctrl_c()?;
+///     // A listener of CTRL-C events.
+///     let mut signal = ctrl_c()?;
 ///
 ///     // Print whenever a CTRL-C event is received.
 ///     for countdown in (0..3).rev() {
-///         stream.recv().await;
+///         signal.recv().await;
 ///         println!("got CTRL-C. {} more to exit", countdown);
 ///     }
 ///
@@ -150,26 +45,32 @@ unsafe extern "system" fn handler(ty: DWORD) -> BOOL {
 /// }
 /// ```
 pub fn ctrl_c() -> io::Result<CtrlC> {
-    Event::new(CTRL_C_EVENT).map(|inner| CtrlC { inner })
+    Ok(CtrlC {
+        inner: self::imp::ctrl_c()?,
+    })
 }
 
-/// Represents a stream which receives "ctrl-c" notifications sent to the process
+/// Represents a listener which receives "ctrl-c" notifications sent to the process
 /// via `SetConsoleCtrlHandler`.
 ///
-/// A notification to this process notifies *all* streams listening for
+/// This event can be turned into a `Stream` using [`CtrlCStream`].
+///
+/// [`CtrlCStream`]: https://docs.rs/tokio-stream/latest/tokio_stream/wrappers/struct.CtrlCStream.html
+///
+/// A notification to this process notifies *all* receivers for
 /// this event. Moreover, the notifications **are coalesced** if they aren't processed
 /// quickly enough. This means that if two notifications are received back-to-back,
-/// then the stream may only receive one item about the two notifications.
-#[must_use = "streams do nothing unless polled"]
+/// then the listener may only receive one item about the two notifications.
+#[must_use = "listeners do nothing unless polled"]
 #[derive(Debug)]
 pub struct CtrlC {
-    inner: Event,
+    inner: RxFuture,
 }
 
 impl CtrlC {
     /// Receives the next signal notification event.
     ///
-    /// `None` is returned if no more events can be received by this stream.
+    /// `None` is returned if no more events can be received by the listener.
     ///
     /// # Examples
     ///
@@ -178,12 +79,11 @@ impl CtrlC {
     ///
     /// #[tokio::main]
     /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    ///     // An infinite stream of CTRL-C events.
-    ///     let mut stream = ctrl_c()?;
+    ///     let mut signal = ctrl_c()?;
     ///
     ///     // Print whenever a CTRL-C event is received.
     ///     for countdown in (0..3).rev() {
-    ///         stream.recv().await;
+    ///         signal.recv().await;
     ///         println!("got CTRL-C. {} more to exit", countdown);
     ///     }
     ///
@@ -191,13 +91,13 @@ impl CtrlC {
     /// }
     /// ```
     pub async fn recv(&mut self) -> Option<()> {
-        self.inner.inner.recv().await
+        self.inner.recv().await
     }
 
     /// Polls to receive the next signal notification event, outside of an
     /// `async` context.
     ///
-    /// `None` is returned if no more events can be received by this stream.
+    /// `None` is returned if no more events can be received.
     ///
     /// # Examples
     ///
@@ -223,27 +123,31 @@ impl CtrlC {
     /// }
     /// ```
     pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
-        self.inner.inner.poll_recv(cx)
+        self.inner.poll_recv(cx)
     }
 }
 
-/// Represents a stream which receives "ctrl-break" notifications sent to the process
+/// Represents a listener which receives "ctrl-break" notifications sent to the process
 /// via `SetConsoleCtrlHandler`.
 ///
-/// A notification to this process notifies *all* streams listening for
+/// This listener can be turned into a `Stream` using [`CtrlBreakStream`].
+///
+/// [`CtrlBreakStream`]: https://docs.rs/tokio-stream/latest/tokio_stream/wrappers/struct.CtrlBreakStream.html
+///
+/// A notification to this process notifies *all* receivers for
 /// this event. Moreover, the notifications **are coalesced** if they aren't processed
 /// quickly enough. This means that if two notifications are received back-to-back,
-/// then the stream may only receive one item about the two notifications.
-#[must_use = "streams do nothing unless polled"]
+/// then the listener may only receive one item about the two notifications.
+#[must_use = "listeners do nothing unless polled"]
 #[derive(Debug)]
 pub struct CtrlBreak {
-    inner: Event,
+    inner: RxFuture,
 }
 
 impl CtrlBreak {
     /// Receives the next signal notification event.
     ///
-    /// `None` is returned if no more events can be received by this stream.
+    /// `None` is returned if no more events can be received by this listener.
     ///
     /// # Examples
     ///
@@ -252,24 +156,24 @@ impl CtrlBreak {
     ///
     /// #[tokio::main]
     /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    ///     // An infinite stream of CTRL-BREAK events.
-    ///     let mut stream = ctrl_break()?;
+    ///     // A listener of CTRL-BREAK events.
+    ///     let mut signal = ctrl_break()?;
     ///
     ///     // Print whenever a CTRL-BREAK event is received.
     ///     loop {
-    ///         stream.recv().await;
+    ///         signal.recv().await;
     ///         println!("got signal CTRL-BREAK");
     ///     }
     /// }
     /// ```
     pub async fn recv(&mut self) -> Option<()> {
-        self.inner.inner.recv().await
+        self.inner.recv().await
     }
 
     /// Polls to receive the next signal notification event, outside of an
     /// `async` context.
     ///
-    /// `None` is returned if no more events can be received by this stream.
+    /// `None` is returned if no more events can be received by this listener.
     ///
     /// # Examples
     ///
@@ -295,11 +199,11 @@ impl CtrlBreak {
     /// }
     /// ```
     pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
-        self.inner.inner.poll_recv(cx)
+        self.inner.poll_recv(cx)
     }
 }
 
-/// Creates a new stream which receives "ctrl-break" notifications sent to the
+/// Creates a new listener which receives "ctrl-break" notifications sent to the
 /// process.
 ///
 /// # Examples
@@ -309,67 +213,312 @@ impl CtrlBreak {
 ///
 /// #[tokio::main]
 /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
-///     // An infinite stream of CTRL-BREAK events.
-///     let mut stream = ctrl_break()?;
+///     // A listener of CTRL-BREAK events.
+///     let mut signal = ctrl_break()?;
 ///
 ///     // Print whenever a CTRL-BREAK event is received.
 ///     loop {
-///         stream.recv().await;
+///         signal.recv().await;
 ///         println!("got signal CTRL-BREAK");
 ///     }
 /// }
 /// ```
 pub fn ctrl_break() -> io::Result<CtrlBreak> {
-    Event::new(CTRL_BREAK_EVENT).map(|inner| CtrlBreak { inner })
+    Ok(CtrlBreak {
+        inner: self::imp::ctrl_break()?,
+    })
 }
 
-#[cfg(all(test, not(loom)))]
-mod tests {
-    use super::*;
-    use crate::runtime::Runtime;
+/// Creates a new listener which receives "ctrl-close" notifications sent to the
+/// process.
+///
+/// # Examples
+///
+/// ```rust,no_run
+/// use tokio::signal::windows::ctrl_close;
+///
+/// #[tokio::main]
+/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
+///     // A listener of CTRL-CLOSE events.
+///     let mut signal = ctrl_close()?;
+///
+///     // Print whenever a CTRL-CLOSE event is received.
+///     for countdown in (0..3).rev() {
+///         signal.recv().await;
+///         println!("got CTRL-CLOSE. {} more to exit", countdown);
+///     }
+///
+///     Ok(())
+/// }
+/// ```
+pub fn ctrl_close() -> io::Result<CtrlClose> {
+    Ok(CtrlClose {
+        inner: self::imp::ctrl_close()?,
+    })
+}
 
-    use tokio_test::{assert_ok, assert_pending, assert_ready_ok, task};
+/// Represents a listener which receives "ctrl-close" notitifications sent to the process
+/// via 'SetConsoleCtrlHandler'.
+///
+/// A notification to this process notifies *all* listeners listening for
+/// this event. Moreover, the notifications **are coalesced** if they aren't processed
+/// quickly enough. This means that if two notifications are received back-to-back,
+/// then the listener may only receive one item about the two notifications.
+#[must_use = "listeners do nothing unless polled"]
+#[derive(Debug)]
+pub struct CtrlClose {
+    inner: RxFuture,
+}
 
-    #[test]
-    fn ctrl_c() {
-        let rt = rt();
-        let _enter = rt.enter();
+impl CtrlClose {
+    /// Receives the next signal notification event.
+    ///
+    /// `None` is returned if no more events can be received by this listener.
+    ///
+    /// # Examples
+    ///
+    /// ```rust,no_run
+    /// use tokio::signal::windows::ctrl_close;
+    ///
+    /// #[tokio::main]
+    /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    ///     // A listener of CTRL-CLOSE events.
+    ///     let mut signal = ctrl_close()?;
+    ///
+    ///     // Print whenever a CTRL-CLOSE event is received.
+    ///     signal.recv().await;
+    ///     println!("got CTRL-CLOSE. Cleaning up before exiting");
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    pub async fn recv(&mut self) -> Option<()> {
+        self.inner.recv().await
+    }
 
-        let mut ctrl_c = task::spawn(crate::signal::ctrl_c());
+    /// Polls to receive the next signal notification event, outside of an
+    /// `async` context.
+    ///
+    /// `None` is returned if no more events can be received by this listener.
+    ///
+    /// # Examples
+    ///
+    /// Polling from a manually implemented future
+    ///
+    /// ```rust,no_run
+    /// use std::pin::Pin;
+    /// use std::future::Future;
+    /// use std::task::{Context, Poll};
+    /// use tokio::signal::windows::CtrlClose;
+    ///
+    /// struct MyFuture {
+    ///     ctrl_close: CtrlClose,
+    /// }
+    ///
+    /// impl Future for MyFuture {
+    ///     type Output = Option<()>;
+    ///
+    ///     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+    ///         println!("polling MyFuture");
+    ///         self.ctrl_close.poll_recv(cx)
+    ///     }
+    /// }
+    /// ```
+    pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
+        self.inner.poll_recv(cx)
+    }
+}
 
-        assert_pending!(ctrl_c.poll());
+/// Creates a new listener which receives "ctrl-shutdown" notifications sent to the
+/// process.
+///
+/// # Examples
+///
+/// ```rust,no_run
+/// use tokio::signal::windows::ctrl_shutdown;
+///
+/// #[tokio::main]
+/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
+///     // A listener of CTRL-SHUTDOWN events.
+///     let mut signal = ctrl_shutdown()?;
+///
+///     signal.recv().await;
+///     println!("got CTRL-SHUTDOWN. Cleaning up before exiting");
+///
+///     Ok(())
+/// }
+/// ```
+pub fn ctrl_shutdown() -> io::Result<CtrlShutdown> {
+    Ok(CtrlShutdown {
+        inner: self::imp::ctrl_shutdown()?,
+    })
+}
 
-        // Windows doesn't have a good programmatic way of sending events
-        // like sending signals on Unix, so we'll stub out the actual OS
-        // integration and test that our handling works.
-        unsafe {
-            super::handler(CTRL_C_EVENT);
-        }
+/// Represents a listener which receives "ctrl-shutdown" notitifications sent to the process
+/// via 'SetConsoleCtrlHandler'.
+///
+/// A notification to this process notifies *all* listeners listening for
+/// this event. Moreover, the notifications **are coalesced** if they aren't processed
+/// quickly enough. This means that if two notifications are received back-to-back,
+/// then the listener may only receive one item about the two notifications.
+#[must_use = "listeners do nothing unless polled"]
+#[derive(Debug)]
+pub struct CtrlShutdown {
+    inner: RxFuture,
+}
 
-        assert_ready_ok!(ctrl_c.poll());
+impl CtrlShutdown {
+    /// Receives the next signal notification event.
+    ///
+    /// `None` is returned if no more events can be received by this listener.
+    ///
+    /// # Examples
+    ///
+    /// ```rust,no_run
+    /// use tokio::signal::windows::ctrl_shutdown;
+    ///
+    /// #[tokio::main]
+    /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    ///     // A listener of CTRL-SHUTDOWN events.
+    ///     let mut signal = ctrl_shutdown()?;
+    ///
+    ///     // Print whenever a CTRL-SHUTDOWN event is received.
+    ///     signal.recv().await;
+    ///     println!("got CTRL-SHUTDOWN. Cleaning up before exiting");
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    pub async fn recv(&mut self) -> Option<()> {
+        self.inner.recv().await
     }
 
-    #[test]
-    fn ctrl_break() {
-        let rt = rt();
+    /// Polls to receive the next signal notification event, outside of an
+    /// `async` context.
+    ///
+    /// `None` is returned if no more events can be received by this listener.
+    ///
+    /// # Examples
+    ///
+    /// Polling from a manually implemented future
+    ///
+    /// ```rust,no_run
+    /// use std::pin::Pin;
+    /// use std::future::Future;
+    /// use std::task::{Context, Poll};
+    /// use tokio::signal::windows::CtrlShutdown;
+    ///
+    /// struct MyFuture {
+    ///     ctrl_shutdown: CtrlShutdown,
+    /// }
+    ///
+    /// impl Future for MyFuture {
+    ///     type Output = Option<()>;
+    ///
+    ///     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+    ///         println!("polling MyFuture");
+    ///         self.ctrl_shutdown.poll_recv(cx)
+    ///     }
+    /// }
+    /// ```
+    pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
+        self.inner.poll_recv(cx)
+    }
+}
 
-        rt.block_on(async {
-            let mut ctrl_break = assert_ok!(super::ctrl_break());
+/// Creates a new listener which receives "ctrl-logoff" notifications sent to the
+/// process.
+///
+/// # Examples
+///
+/// ```rust,no_run
+/// use tokio::signal::windows::ctrl_logoff;
+///
+/// #[tokio::main]
+/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
+///     // A listener of CTRL-LOGOFF events.
+///     let mut signal = ctrl_logoff()?;
+///
+///     signal.recv().await;
+///     println!("got CTRL-LOGOFF. Cleaning up before exiting");
+///
+///     Ok(())
+/// }
+/// ```
+pub fn ctrl_logoff() -> io::Result<CtrlLogoff> {
+    Ok(CtrlLogoff {
+        inner: self::imp::ctrl_logoff()?,
+    })
+}
 
-            // Windows doesn't have a good programmatic way of sending events
-            // like sending signals on Unix, so we'll stub out the actual OS
-            // integration and test that our handling works.
-            unsafe {
-                super::handler(CTRL_BREAK_EVENT);
-            }
+/// Represents a listener which receives "ctrl-logoff" notitifications sent to the process
+/// via 'SetConsoleCtrlHandler'.
+///
+/// A notification to this process notifies *all* listeners listening for
+/// this event. Moreover, the notifications **are coalesced** if they aren't processed
+/// quickly enough. This means that if two notifications are received back-to-back,
+/// then the listener may only receive one item about the two notifications.
+#[must_use = "listeners do nothing unless polled"]
+#[derive(Debug)]
+pub struct CtrlLogoff {
+    inner: RxFuture,
+}
 
-            ctrl_break.recv().await.unwrap();
-        });
+impl CtrlLogoff {
+    /// Receives the next signal notification event.
+    ///
+    /// `None` is returned if no more events can be received by this listener.
+    ///
+    /// # Examples
+    ///
+    /// ```rust,no_run
+    /// use tokio::signal::windows::ctrl_logoff;
+    ///
+    /// #[tokio::main]
+    /// async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    ///     // An listener of CTRL-LOGOFF events.
+    ///     let mut signal = ctrl_logoff()?;
+    ///
+    ///     // Print whenever a CTRL-LOGOFF event is received.
+    ///     signal.recv().await;
+    ///     println!("got CTRL-LOGOFF. Cleaning up before exiting");
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    pub async fn recv(&mut self) -> Option<()> {
+        self.inner.recv().await
     }
 
-    fn rt() -> Runtime {
-        crate::runtime::Builder::new_current_thread()
-            .build()
-            .unwrap()
+    /// Polls to receive the next signal notification event, outside of an
+    /// `async` context.
+    ///
+    /// `None` is returned if no more events can be received by this listener.
+    ///
+    /// # Examples
+    ///
+    /// Polling from a manually implemented future
+    ///
+    /// ```rust,no_run
+    /// use std::pin::Pin;
+    /// use std::future::Future;
+    /// use std::task::{Context, Poll};
+    /// use tokio::signal::windows::CtrlLogoff;
+    ///
+    /// struct MyFuture {
+    ///     ctrl_logoff: CtrlLogoff,
+    /// }
+    ///
+    /// impl Future for MyFuture {
+    ///     type Output = Option<()>;
+    ///
+    ///     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+    ///         println!("polling MyFuture");
+    ///         self.ctrl_logoff.poll_recv(cx)
+    ///     }
+    /// }
+    /// ```
+    pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
+        self.inner.poll_recv(cx)
     }
 }
diff --git a/vendor/tokio/src/signal/windows/stub.rs b/vendor/tokio/src/signal/windows/stub.rs
new file mode 100644
index 000000000..61df30979
--- /dev/null
+++ b/vendor/tokio/src/signal/windows/stub.rs
@@ -0,0 +1,25 @@
+//! Stub implementations for the platform API so that rustdoc can build linkable
+//! documentation on non-windows platforms.
+
+use crate::signal::RxFuture;
+use std::io;
+
+pub(super) fn ctrl_break() -> io::Result<RxFuture> {
+    panic!()
+}
+
+pub(super) fn ctrl_close() -> io::Result<RxFuture> {
+    panic!()
+}
+
+pub(super) fn ctrl_c() -> io::Result<RxFuture> {
+    panic!()
+}
+
+pub(super) fn ctrl_logoff() -> io::Result<RxFuture> {
+    panic!()
+}
+
+pub(super) fn ctrl_shutdown() -> io::Result<RxFuture> {
+    panic!()
+}
diff --git a/vendor/tokio/src/signal/windows/sys.rs b/vendor/tokio/src/signal/windows/sys.rs
new file mode 100644
index 000000000..26e6bdf81
--- /dev/null
+++ b/vendor/tokio/src/signal/windows/sys.rs
@@ -0,0 +1,229 @@
+use std::io;
+use std::sync::Once;
+
+use crate::signal::registry::{globals, EventId, EventInfo, Init, Storage};
+use crate::signal::RxFuture;
+
+use windows_sys::Win32::Foundation::BOOL;
+use windows_sys::Win32::System::Console as console;
+
+pub(super) fn ctrl_break() -> io::Result<RxFuture> {
+    new(console::CTRL_BREAK_EVENT)
+}
+
+pub(super) fn ctrl_close() -> io::Result<RxFuture> {
+    new(console::CTRL_CLOSE_EVENT)
+}
+
+pub(super) fn ctrl_c() -> io::Result<RxFuture> {
+    new(console::CTRL_C_EVENT)
+}
+
+pub(super) fn ctrl_logoff() -> io::Result<RxFuture> {
+    new(console::CTRL_LOGOFF_EVENT)
+}
+
+pub(super) fn ctrl_shutdown() -> io::Result<RxFuture> {
+    new(console::CTRL_SHUTDOWN_EVENT)
+}
+
+fn new(signum: u32) -> io::Result<RxFuture> {
+    global_init()?;
+    let rx = globals().register_listener(signum as EventId);
+    Ok(RxFuture::new(rx))
+}
+
+#[derive(Debug)]
+pub(crate) struct OsStorage {
+    ctrl_break: EventInfo,
+    ctrl_close: EventInfo,
+    ctrl_c: EventInfo,
+    ctrl_logoff: EventInfo,
+    ctrl_shutdown: EventInfo,
+}
+
+impl Init for OsStorage {
+    fn init() -> Self {
+        Self {
+            ctrl_break: Default::default(),
+            ctrl_close: Default::default(),
+            ctrl_c: Default::default(),
+            ctrl_logoff: Default::default(),
+            ctrl_shutdown: Default::default(),
+        }
+    }
+}
+
+impl Storage for OsStorage {
+    fn event_info(&self, id: EventId) -> Option<&EventInfo> {
+        match u32::try_from(id) {
+            Ok(console::CTRL_BREAK_EVENT) => Some(&self.ctrl_break),
+            Ok(console::CTRL_CLOSE_EVENT) => Some(&self.ctrl_close),
+            Ok(console::CTRL_C_EVENT) => Some(&self.ctrl_c),
+            Ok(console::CTRL_LOGOFF_EVENT) => Some(&self.ctrl_logoff),
+            Ok(console::CTRL_SHUTDOWN_EVENT) => Some(&self.ctrl_shutdown),
+            _ => None,
+        }
+    }
+
+    fn for_each<'a, F>(&'a self, mut f: F)
+    where
+        F: FnMut(&'a EventInfo),
+    {
+        f(&self.ctrl_break);
+        f(&self.ctrl_close);
+        f(&self.ctrl_c);
+        f(&self.ctrl_logoff);
+        f(&self.ctrl_shutdown);
+    }
+}
+
+#[derive(Debug)]
+pub(crate) struct OsExtraData {}
+
+impl Init for OsExtraData {
+    fn init() -> Self {
+        Self {}
+    }
+}
+
+fn global_init() -> io::Result<()> {
+    static INIT: Once = Once::new();
+
+    let mut init = None;
+
+    INIT.call_once(|| unsafe {
+        let rc = console::SetConsoleCtrlHandler(Some(handler), 1);
+        let ret = if rc == 0 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(())
+        };
+
+        init = Some(ret);
+    });
+
+    init.unwrap_or_else(|| Ok(()))
+}
+
+unsafe extern "system" fn handler(ty: u32) -> BOOL {
+    let globals = globals();
+    globals.record_event(ty as EventId);
+
+    // According to https://docs.microsoft.com/en-us/windows/console/handlerroutine
+    // the handler routine is always invoked in a new thread, thus we don't
+    // have the same restrictions as in Unix signal handlers, meaning we can
+    // go ahead and perform the broadcast here.
+    if globals.broadcast() {
+        1
+    } else {
+        // No one is listening for this notification any more
+        // let the OS fire the next (possibly the default) handler.
+        0
+    }
+}
+
+#[cfg(all(test, not(loom)))]
+mod tests {
+    use super::*;
+    use crate::runtime::Runtime;
+
+    use tokio_test::{assert_ok, assert_pending, assert_ready_ok, task};
+
+    #[test]
+    fn ctrl_c() {
+        let rt = rt();
+        let _enter = rt.enter();
+
+        let mut ctrl_c = task::spawn(crate::signal::ctrl_c());
+
+        assert_pending!(ctrl_c.poll());
+
+        // Windows doesn't have a good programmatic way of sending events
+        // like sending signals on Unix, so we'll stub out the actual OS
+        // integration and test that our handling works.
+        unsafe {
+            super::handler(console::CTRL_C_EVENT);
+        }
+
+        assert_ready_ok!(ctrl_c.poll());
+    }
+
+    #[test]
+    fn ctrl_break() {
+        let rt = rt();
+
+        rt.block_on(async {
+            let mut ctrl_break = assert_ok!(crate::signal::windows::ctrl_break());
+
+            // Windows doesn't have a good programmatic way of sending events
+            // like sending signals on Unix, so we'll stub out the actual OS
+            // integration and test that our handling works.
+            unsafe {
+                super::handler(console::CTRL_BREAK_EVENT);
+            }
+
+            ctrl_break.recv().await.unwrap();
+        });
+    }
+
+    #[test]
+    fn ctrl_close() {
+        let rt = rt();
+
+        rt.block_on(async {
+            let mut ctrl_close = assert_ok!(crate::signal::windows::ctrl_close());
+
+            // Windows doesn't have a good programmatic way of sending events
+            // like sending signals on Unix, so we'll stub out the actual OS
+            // integration and test that our handling works.
+            unsafe {
+                super::handler(console::CTRL_CLOSE_EVENT);
+            }
+
+            ctrl_close.recv().await.unwrap();
+        });
+    }
+
+    #[test]
+    fn ctrl_shutdown() {
+        let rt = rt();
+
+        rt.block_on(async {
+            let mut ctrl_shutdown = assert_ok!(crate::signal::windows::ctrl_shutdown());
+
+            // Windows doesn't have a good programmatic way of sending events
+            // like sending signals on Unix, so we'll stub out the actual OS
+            // integration and test that our handling works.
+            unsafe {
+                super::handler(console::CTRL_SHUTDOWN_EVENT);
+            }
+
+            ctrl_shutdown.recv().await.unwrap();
+        });
+    }
+
+    #[test]
+    fn ctrl_logoff() {
+        let rt = rt();
+
+        rt.block_on(async {
+            let mut ctrl_logoff = assert_ok!(crate::signal::windows::ctrl_logoff());
+
+            // Windows doesn't have a good programmatic way of sending events
+            // like sending signals on Unix, so we'll stub out the actual OS
+            // integration and test that our handling works.
+            unsafe {
+                super::handler(console::CTRL_LOGOFF_EVENT);
+            }
+
+            ctrl_logoff.recv().await.unwrap();
+        });
+    }
+
+    fn rt() -> Runtime {
+        crate::runtime::Builder::new_current_thread()
+            .build()
+            .unwrap()
+    }
+}