sync: move into `tokio` crate (#1705)

A step towards collapsing Tokio sub crates into a single `tokio`
crate (#1318).

The sync implementation is now provided by the main `tokio` crate.
Functionality can be opted out of by using the various net related
feature flags.

3 files changed, 4 insertions, 6 deletions

diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs
index 7d2fd7a9..e70d0495 100644
--- a/tokio/src/signal/registry.rs
+++ b/tokio/src/signal/registry.rs
@@ -1,6 +1,6 @@
 use crate::signal::os::{OsExtraData, OsStorage};
 
-use tokio_sync::mpsc::Sender;
+use crate::sync::mpsc::Sender;
 
 use lazy_static::lazy_static;
 use std::ops;
diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs
index 075e788c..87871503 100644
--- a/tokio/src/signal/unix.rs
+++ b/tokio/src/signal/unix.rs
@@ -8,8 +8,7 @@
 use crate::io::AsyncRead;
 use crate::net::util::PollEvented;
 use crate::signal::registry::{globals, EventId, EventInfo, Globals, Init, Storage};
-
-use tokio_sync::mpsc::{channel, Receiver};
+use crate::sync::mpsc::{channel, Receiver};
 
 use futures_core::stream::Stream;
 use libc::c_int;
diff --git a/tokio/src/signal/windows.rs b/tokio/src/signal/windows.rs
index abde334b..1e68d628 100644
--- a/tokio/src/signal/windows.rs
+++ b/tokio/src/signal/windows.rs
@@ -7,9 +7,8 @@
 
 #![cfg(windows)]
 
-use super::registry::{globals, EventId, EventInfo, Init, Storage};
-
-use tokio_sync::mpsc::{channel, Receiver};
+use crate::signal::registry::{globals, EventId, EventInfo, Init, Storage};
+use crate::sync::mpsc::{channel, Receiver};
 
 use futures_core::stream::Stream;
 use std::convert::TryFrom;