Merge tag 'upstream/libpthread/20090404' into upstream-merged

1 files changed, 43 insertions, 0 deletions

diff --git a/libpthread/sysdeps/generic/pt-once.c b/libpthread/sysdeps/generic/pt-once.c
new file mode 100644
index 00000000..5be5e484
--- /dev/null
+++ b/libpthread/sysdeps/generic/pt-once.c
@@ -0,0 +1,43 @@
+/* pthread_once.  Generic version.
+   Copyright (C) 2002 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <pthread.h>
+#include <bits/memory.h>
+
+#include <pt-internal.h>
+
+int
+pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
+{
+  if (once_control->run == 0)
+    {
+      __pthread_spin_lock (&once_control->lock);
+
+      if (once_control->run == 0)
+	{
+	  init_routine ();
+	  __memory_barrier ();
+	  once_control->run = 1;
+	}
+
+      __pthread_spin_unlock (&once_control->lock);
+    }
+
+  return 0;
+}