Remove thread_local_state

Author: Stjepan Glavina

src/libstd/io/stdio.rs

@@ -18,8 +18,6 @@ use sync::{Arc, Mutex, MutexGuard};
 use sys::stdio;
 use sys_common::remutex::{ReentrantMutex, ReentrantMutexGuard};
 use thread::LocalKey;
-#[allow(deprecated)]
-use thread::LocalKeyState;
 
 /// Stdout used by print! and println! macros
 thread_local! {
@@ -670,25 +668,26 @@ pub fn set_print(sink: Option<Box<Write + Send>>) -> Option<Box<Write + Send>> {
 /// thread, it will just fall back to the global stream.
 ///
 /// However, if the actual I/O causes an error, this function does panic.
-#[allow(deprecated)]
-fn print_to<T>(args: fmt::Arguments,
-               local_s: &'static LocalKey<RefCell<Option<Box<Write+Send>>>>,
-               global_s: fn() -> T,
-               label: &str) where T: Write {
-    let result = match local_s.state() {
-        LocalKeyState::Uninitialized |
-        LocalKeyState::Destroyed => global_s().write_fmt(args),
-        LocalKeyState::Valid => {
-            local_s.with(|s| {
-                if let Ok(mut borrowed) = s.try_borrow_mut() {
-                    if let Some(w) = borrowed.as_mut() {
-                        return w.write_fmt(args);
-                    }
-                }
-                global_s().write_fmt(args)
-            })
+fn print_to<T>(
+    args: fmt::Arguments,
+    local_s: &'static LocalKey<RefCell<Option<Box<Write+Send>>>>,
+    global_s: fn() -> T,
+    label: &str,
+)
+where
+    T: Write,
+{
+    let result = local_s.try_with(|s| {
+        if let Ok(mut borrowed) = s.try_borrow_mut() {
+            if let Some(w) = borrowed.as_mut() {
+                return w.write_fmt(args);
+            }
         }
-    };
+        global_s().write_fmt(args)
+    }).unwrap_or_else(|_| {
+        global_s().write_fmt(args)
+    });
+
     if let Err(e) = result {
         panic!("failed printing to {}: {}", label, e);
     }

src/libstd/thread/local.rs

@@ -195,45 +195,6 @@ macro_rules! __thread_local_inner {
     }
 }
 
-/// Indicator of the state of a thread local storage key.
-#[unstable(feature = "thread_local_state",
-           reason = "state querying was recently added",
-           issue = "27716")]
-#[rustc_deprecated(since = "1.26.0", reason = "use `LocalKey::try_with` instead")]
-#[derive(Debug, Eq, PartialEq, Copy, Clone)]
-pub enum LocalKeyState {
-    /// All keys are in this state whenever a thread starts. Keys will
-    /// transition to the `Valid` state once the first call to [`with`] happens
-    /// and the initialization expression succeeds.
-    ///
-    /// Keys in the `Uninitialized` state will yield a reference to the closure
-    /// passed to [`with`] so long as the initialization routine does not panic.
-    ///
-    /// [`with`]: ../../std/thread/struct.LocalKey.html#method.with
-    Uninitialized,
-
-    /// Once a key has been accessed successfully, it will enter the `Valid`
-    /// state. Keys in the `Valid` state will remain so until the thread exits,
-    /// at which point the destructor will be run and the key will enter the
-    /// `Destroyed` state.
-    ///
-    /// Keys in the `Valid` state will be guaranteed to yield a reference to the
-    /// closure passed to [`with`].
-    ///
-    /// [`with`]: ../../std/thread/struct.LocalKey.html#method.with
-    Valid,
-
-    /// When a thread exits, the destructors for keys will be run (if
-    /// necessary). While a destructor is running, and possibly after a
-    /// destructor has run, a key is in the `Destroyed` state.
-    ///
-    /// Keys in the `Destroyed` states will trigger a panic when accessed via
-    /// [`with`].
-    ///
-    /// [`with`]: ../../std/thread/struct.LocalKey.html#method.with
-    Destroyed,
-}
-
 /// An error returned by [`LocalKey::try_with`](struct.LocalKey.html#method.try_with).
 #[stable(feature = "thread_local_try_with", since = "1.26.0")]
 pub struct AccessError {
@@ -307,51 +268,6 @@ impl<T: 'static> LocalKey<T> {
         (*ptr).as_ref().unwrap()
     }
 
-    /// Query the current state of this key.
-    ///
-    /// A key is initially in the `Uninitialized` state whenever a thread
-    /// starts. It will remain in this state up until the first call to [`with`]
-    /// within a thread has run the initialization expression successfully.
-    ///
-    /// Once the initialization expression succeeds, the key transitions to the
-    /// `Valid` state which will guarantee that future calls to [`with`] will
-    /// succeed within the thread. Some keys might skip the `Uninitialized`
-    /// state altogether and start in the `Valid` state as an optimization
-    /// (e.g. keys initialized with a constant expression), but no guarantees
-    /// are made.
-    ///
-    /// When a thread exits, each key will be destroyed in turn, and as keys are
-    /// destroyed they will enter the `Destroyed` state just before the
-    /// destructor starts to run. Keys may remain in the `Destroyed` state after
-    /// destruction has completed. Keys without destructors (e.g. with types
-    /// that are [`Copy`]), may never enter the `Destroyed` state.
-    ///
-    /// Keys in the `Uninitialized` state can be accessed so long as the
-    /// initialization does not panic. Keys in the `Valid` state are guaranteed
-    /// to be able to be accessed. Keys in the `Destroyed` state will panic on
-    /// any call to [`with`].
-    ///
-    /// [`with`]: ../../std/thread/struct.LocalKey.html#method.with
-    /// [`Copy`]: ../../std/marker/trait.Copy.html
-    #[unstable(feature = "thread_local_state",
-               reason = "state querying was recently added",
-               issue = "27716")]
-    #[rustc_deprecated(since = "1.26.0", reason = "use `LocalKey::try_with` instead")]
-    #[allow(deprecated)]
-    pub fn state(&'static self) -> LocalKeyState {
-        unsafe {
-            match (self.inner)() {
-                Some(cell) => {
-                    match *cell.get() {
-                        Some(..) => LocalKeyState::Valid,
-                        None => LocalKeyState::Uninitialized,
-                    }
-                }
-                None => LocalKeyState::Destroyed,
-            }
-        }
-    }
-
     /// Acquires a reference to the value in this TLS key.
     ///
     /// This will lazily initialize the value if this thread has not referenced
@@ -527,8 +443,6 @@ pub mod os {
 mod tests {
     use sync::mpsc::{channel, Sender};
     use cell::{Cell, UnsafeCell};
-    #[allow(deprecated)]
-    use super::LocalKeyState;
     use thread;
 
     struct Foo(Sender<()>);
@@ -563,26 +477,21 @@ mod tests {
     }
 
     #[test]
-    #[allow(deprecated)]
     fn states() {
         struct Foo;
         impl Drop for Foo {
             fn drop(&mut self) {
-                assert!(FOO.state() == LocalKeyState::Destroyed);
+                assert!(FOO.try_with(|_| ()).is_err());
             }
         }
         fn foo() -> Foo {
-            assert!(FOO.state() == LocalKeyState::Uninitialized);
+            assert!(FOO.try_with(|_| ()).is_err());
             Foo
         }
         thread_local!(static FOO: Foo = foo());
 
         thread::spawn(|| {
-            assert!(FOO.state() == LocalKeyState::Uninitialized);
-            FOO.with(|_| {
-                assert!(FOO.state() == LocalKeyState::Valid);
-            });
-            assert!(FOO.state() == LocalKeyState::Valid);
+            assert!(FOO.try_with(|_| ()).is_ok());
         }).join().ok().unwrap();
     }
 
@@ -601,7 +510,6 @@ mod tests {
     }
 
     #[test]
-    #[allow(deprecated)]
     fn circular() {
         struct S1;
         struct S2;
@@ -612,8 +520,7 @@ mod tests {
         impl Drop for S1 {
             fn drop(&mut self) {
                 unsafe {
-                    HITS += 1;
-                    if K2.state() == LocalKeyState::Destroyed {
+                    if K2.try_with(|_| ()).is_err() {
                         assert_eq!(HITS, 3);
                     } else {
                         if HITS == 1 {
@@ -629,7 +536,7 @@ mod tests {
             fn drop(&mut self) {
                 unsafe {
                     HITS += 1;
-                    assert!(K1.state() != LocalKeyState::Destroyed);
+                    assert!(K1.try_with(|_| ()).is_ok());
                     assert_eq!(HITS, 2);
                     K1.with(|s| *s.get() = Some(S1));
                 }
@@ -642,14 +549,13 @@ mod tests {
     }
 
     #[test]
-    #[allow(deprecated)]
     fn self_referential() {
         struct S1;
         thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
 
         impl Drop for S1 {
             fn drop(&mut self) {
-                assert!(K1.state() == LocalKeyState::Destroyed);
+                assert!(K1.try_with(|_| ()).is_err());
             }
         }
 
@@ -664,7 +570,6 @@ mod tests {
     // test on macOS.
     #[test]
     #[cfg_attr(target_os = "macos", ignore)]
-    #[allow(deprecated)]
     fn dtors_in_dtors_in_dtors() {
         struct S1(Sender<()>);
         thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
@@ -674,9 +579,7 @@ mod tests {
             fn drop(&mut self) {
                 let S1(ref tx) = *self;
                 unsafe {
-                    if K2.state() != LocalKeyState::Destroyed {
-                        K2.with(|s| *s.get() = Some(Foo(tx.clone())));
-                    }
+                    let _ = K2.try_with(|s| *s.get() = Some(Foo(tx.clone())));
                 }
             }
         }

src/libstd/thread/mod.rs

@@ -192,9 +192,6 @@ use time::Duration;
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::local::{LocalKey, AccessError};
-#[stable(feature = "rust1", since = "1.0.0")]
-#[allow(deprecated)]
-pub use self::local::LocalKeyState;
 
 // The types used by the thread_local! macro to access TLS keys. Note that there
 // are two types, the "OS" type and the "fast" type. The OS thread local key