1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/nacl/pthread-pids.h b/sysdeps/nacl/pthread-pids.h
index ccb99d6b0c..1589e5b342 100644
--- a/sysdeps/nacl/pthread-pids.h
+++ b/sysdeps/nacl/pthread-pids.h
@@ -50,6 +50,9 @@ __nacl_get_tid (struct pthread *pd)
   assert ((id & 1) == 0);
   assert (sizeof id == sizeof tid);
   assert (tid > 0);
+  /* This ensures that NACL_EXITING_TID (lowlevellock.h) can never
+     be a valid TID value.  */
+  assert ((tid & 1) == 0);
   return tid;
 }