future continues ...

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@112284 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/condition_variable b/include/condition_variable
index ce14b62..3e766b6 100644
--- a/include/condition_variable
+++ b/include/condition_variable
@@ -61,6 +61,8 @@
     native_handle_type native_handle();
 };
 
+void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk);
+
 class condition_variable_any
 {
 public: