Imported Upstream version 4.8.1

[platform/upstream/gcc48.git] / libgo / runtime / lock_futex.c

diff --git a/libgo/runtime/lock_futex.c b/libgo/runtime/lock_futex.c
index 9a533a5..5374aff 100644 (file)
--- a/libgo/runtime/lock_futex.c
+++ b/libgo/runtime/lock_futex.c
@@ -111,7 +111,8 @@ runtime_noteclear(Note *n)
 void
 runtime_notewakeup(Note *n)
 {
-       runtime_xchg(&n->key, 1);
+       if(runtime_xchg(&n->key, 1))
+               runtime_throw("notewakeup - double wakeup");
        runtime_futexwakeup(&n->key, 1);
 }