Add memory barriers on lock/unlock of SpinLock (#13050)

crystal-lang · Feb 8, 2023 · 2d49b07 · 2d49b07
1 parent 33b55a4
commit 2d49b07
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/crystal/spin_lock.cr b/src/crystal/spin_lock.cr
@@ -11,11 +11,17 @@ class Crystal::SpinLock
           Intrinsics.pause
         end
       end
+      {% if flag?(:aarch64) %}
+        Atomic::Ops.fence :sequentially_consistent, false 
+      {% end %}      
     {% end %}
   end
 
   def unlock
     {% if flag?(:preview_mt) %}
+      {% if flag?(:aarch64) %}
+        Atomic::Ops.fence :sequentially_consistent, false 
+      {% end %}
       @m.lazy_set(0)
     {% end %}
   end