Auto merge of #133423 - jieyouxu:rollup-m3gyoz6, r=jieyouxu

Rollup of 6 pull requests

Successful merges:

 - #132730 (std: allow after-main use of synchronization primitives)
 - #133105 (only store valid proc macro item for doc link)
 - #133260 (Constify the `Deref`/`DerefMut` traits, too)
 - #133297 (Remove legacy bitcode for iOS)
 - #133298 (Mention that std::fs::remove_dir_all fails on files)
 - #133384 (add a test for target-feature-ABI warnings in closures and when calling extern fn)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 17 insertions, 0 deletions

diff --git a/library/std/src/thread/current.rs b/library/std/src/thread/current.rs
index e6eb90c4c30..b9b959f9894 100644
--- a/library/std/src/thread/current.rs
+++ b/library/std/src/thread/current.rs
@@ -165,6 +165,23 @@ pub(crate) fn try_current() -> Option<Thread> {
     }
 }
 
+/// Gets a handle to the thread that invokes it. If the handle stored in thread-
+/// local storage was already destroyed, this creates a new unnamed temporary
+/// handle to allow thread parking in nearly all situations.
+pub(crate) fn current_or_unnamed() -> Thread {
+    let current = CURRENT.get();
+    if current > DESTROYED {
+        unsafe {
+            let current = ManuallyDrop::new(Thread::from_raw(current));
+            (*current).clone()
+        }
+    } else if current == DESTROYED {
+        Thread::new_unnamed(id::get_or_init())
+    } else {
+        init_current(current)
+    }
+}
+
 /// Gets a handle to the thread that invokes it.
 ///
 /// # Examples