// Sure wish we had macro hygiene, no?
#[doc(hidden)]
-#[unstable(feature = "thread_local_internals")]
pub mod __impl {
pub use super::imp::Key as KeyInner;
pub use super::imp::destroy_value;
// This is trivially devirtualizable by LLVM because we never store anything
// to this field and rustc can declare the `static` as constant as well.
#[doc(hidden)]
- #[unstable(feature = "thread_local_internals")]
pub inner: fn() -> &'static __impl::KeyInner<UnsafeCell<Option<T>>>,
// initialization routine to invoke to create a value
#[doc(hidden)]
- #[unstable(feature = "thread_local_internals")]
pub init: fn() -> T,
}
}
#[cfg(all(any(target_os = "macos", target_os = "linux"), not(target_arch = "aarch64")))]
+#[doc(hidden)]
mod imp {
use prelude::v1::*;
use intrinsics;
use ptr;
- #[doc(hidden)]
- #[unstable(feature = "thread_local_internals")]
pub struct Key<T> {
// Place the inner bits in an `UnsafeCell` to currently get around the
// "only Sync statics" restriction. This allows any type to be placed in
//
// Note that all access requires `T: 'static` so it can't be a type with
// any borrowed pointers still.
- #[unstable(feature = "thread_local_internals")]
pub inner: UnsafeCell<T>,
// Metadata to keep track of the state of the destructor. Remember that
// these variables are thread-local, not global.
- #[unstable(feature = "thread_local_internals")]
pub dtor_registered: UnsafeCell<bool>, // should be Cell
- #[unstable(feature = "thread_local_internals")]
pub dtor_running: UnsafeCell<bool>, // should be Cell
}
unsafe impl<T> ::marker::Sync for Key<T> { }
- #[doc(hidden)]
impl<T> Key<T> {
pub unsafe fn get(&'static self) -> Option<&'static T> {
if intrinsics::needs_drop::<T>() && *self.dtor_running.get() {
_tlv_atexit(dtor, t);
}
- #[doc(hidden)]
- #[unstable(feature = "thread_local_internals")]
pub unsafe extern fn destroy_value<T>(ptr: *mut u8) {
let ptr = ptr as *mut Key<T>;
// Right before we run the user destructor be sure to flag the
}
#[cfg(any(not(any(target_os = "macos", target_os = "linux")), target_arch = "aarch64"))]
+#[doc(hidden)]
mod imp {
use prelude::v1::*;
use ptr;
use sys_common::thread_local::StaticKey as OsStaticKey;
- #[doc(hidden)]
- #[unstable(feature = "thread_local_internals")]
pub struct Key<T> {
// Statically allocated initialization expression, using an `UnsafeCell`
// for the same reasons as above.
- #[unstable(feature = "thread_local_internals")]
pub inner: UnsafeCell<T>,
// OS-TLS key that we'll use to key off.
- #[unstable(feature = "thread_local_internals")]
pub os: OsStaticKey,
}
value: T,
}
- #[doc(hidden)]
impl<T> Key<T> {
pub unsafe fn get(&'static self) -> Option<&'static T> {
self.ptr().map(|p| &*p)
key: self,
value: mem::transmute_copy(&self.inner),
};
- let ptr: *mut Value<T> = boxed::into_raw(ptr);
+ let ptr = boxed::into_raw(ptr);
self.os.set(ptr as *mut u8);
Some(&mut (*ptr).value as *mut T)
}
}
- #[doc(hidden)]
- #[unstable(feature = "thread_local_internals")]
pub unsafe extern fn destroy_value<T: 'static>(ptr: *mut u8) {
// The OS TLS ensures that this key contains a NULL value when this
// destructor starts to run. We set it back to a sentinel value of 1 to
//
// Note that to prevent an infinite loop we reset it back to null right
// before we return from the destructor ourselves.
- let ptr: Box<Value<T>> = Box::from_raw(ptr as *mut Value<T>);
+ let ptr = Box::from_raw(ptr as *mut Value<T>);
let key = ptr.key;
key.os.set(1 as *mut u8);
drop(ptr);