From e32460276cb146b665c0c18b50bf6ea7764c693b Mon Sep 17 00:00:00 2001
From: Jubilee Young <workingjubilee@gmail.com>
Date: Sun, 14 Jul 2024 17:59:37 -0700
Subject: std: Unsafe-wrap std::sync

---
 library/std/src/sync/mpmc/zero.rs | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

(limited to 'library/std/src/sync/mpmc/zero.rs')

diff --git a/library/std/src/sync/mpmc/zero.rs b/library/std/src/sync/mpmc/zero.rs
index 1b82713edc7..6d1c9d64e7a 100644
--- a/library/std/src/sync/mpmc/zero.rs
+++ b/library/std/src/sync/mpmc/zero.rs
@@ -103,9 +103,11 @@ impl<T> Channel<T> {
             return Err(msg);
         }
 
-        let packet = &*(token.zero.0 as *const Packet<T>);
-        packet.msg.get().write(Some(msg));
-        packet.ready.store(true, Ordering::Release);
+        unsafe {
+            let packet = &*(token.zero.0 as *const Packet<T>);
+            packet.msg.get().write(Some(msg));
+            packet.ready.store(true, Ordering::Release);
+        }
         Ok(())
     }
 
@@ -116,22 +118,24 @@ impl<T> Channel<T> {
             return Err(());
         }
 
-        let packet = &*(token.zero.0 as *const Packet<T>);
+        let packet = unsafe { &*(token.zero.0 as *const Packet<T>) };
 
         if packet.on_stack {
             // The message has been in the packet from the beginning, so there is no need to wait
             // for it. However, after reading the message, we need to set `ready` to `true` in
             // order to signal that the packet can be destroyed.
-            let msg = packet.msg.get().replace(None).unwrap();
+            let msg = unsafe { packet.msg.get().replace(None) }.unwrap();
             packet.ready.store(true, Ordering::Release);
             Ok(msg)
         } else {
             // Wait until the message becomes available, then read it and destroy the
             // heap-allocated packet.
             packet.wait_ready();
-            let msg = packet.msg.get().replace(None).unwrap();
-            drop(Box::from_raw(token.zero.0 as *mut Packet<T>));
-            Ok(msg)
+            unsafe {
+                let msg = packet.msg.get().replace(None).unwrap();
+                drop(Box::from_raw(token.zero.0 as *mut Packet<T>));
+                Ok(msg)
+            }
         }
     }
 
-- 
cgit 1.4.1-3-g733a5