diff --git a/libcxx/src/thread.cpp b/libcxx/src/thread.cpp
--- a/libcxx/src/thread.cpp
+++ b/libcxx/src/thread.cpp
@@ -158,8 +158,8 @@
     for (_Notify::iterator i = notify_.begin(), e = notify_.end();
             i != e; ++i)
     {
-        i->second->unlock();
         i->first->notify_all();
+        i->second->unlock();
     }
     for (_AsyncStates::iterator i = async_states_.begin(), e = async_states_.end();
             i != e; ++i)