CoAlloc: sys ... thread dtor: minor

Author: peter-lyons-kehl

library/std/src/sys/unix/thread_local_dtor.rs

@@ -1,12 +1,9 @@
 #![cfg(target_thread_local)]
 #![unstable(feature = "thread_local_internals", issue = "none")]
-#![feature(global_co_alloc_plvec)]
 
 //! Provides thread-local destructors without an associated "key", which
 //! can be more efficient.
 
-use core::alloc::PlVec;
-
 // Since what appears to be glibc 2.18 this symbol has been shipped which
 // GCC and clang both use to invoke destructors in thread_local globals, so
 // let's do the same!
@@ -74,6 +71,15 @@ pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
         REGISTERED.set(true);
     }
 
+    type List = alloc::vec::PlVec<(*mut u8, unsafe extern "C" fn(*mut u8))>;
+
+    #[thread_local]
+    static DTORS: Cell<*mut List> = Cell::new(ptr::null_mut());
+    if DTORS.get().is_null() {
+        let v: Box<List> = box Vec::new();
+        DTORS.set(Box::into_raw(v));
+    }
+
     extern "C" {
         fn _tlv_atexit(dtor: unsafe extern "C" fn(*mut u8), arg: *mut u8);
     }

library/std/src/sys_common/thread_local_dtor.rs

@@ -12,7 +12,6 @@
 
 #![unstable(feature = "thread_local_internals", issue = "none")]
 #![allow(dead_code)]
-#![feature(global_co_alloc_plvec)]
 
 use crate::ptr;
 use crate::sys_common::thread_local_key::StaticKey;