1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/htl/pt-once.c b/sysdeps/htl/pt-once.c
new file mode 100644
index 0000000000..7ab929db6c
--- /dev/null
+++ b/sysdeps/htl/pt-once.c
@@ -0,0 +1,44 @@
+/* pthread_once.  Generic version.
+   Copyright (C) 2002-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library;  if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+#include <atomic.h>
+
+#include <pt-internal.h>
+
+int
+__pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
+{
+  atomic_full_barrier ();
+  if (once_control->__run == 0)
+    {
+      __pthread_spin_lock (&once_control->__lock);
+
+      if (once_control->__run == 0)
+	{
+	  init_routine ();
+	  atomic_full_barrier ();
+	  once_control->__run = 1;
+	}
+
+      __pthread_spin_unlock (&once_control->__lock);
+    }
+
+  return 0;
+}
+strong_alias (__pthread_once, pthread_once);