1 files changed, 38 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c b/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c
new file mode 100644
index 0000000000..9ceae3ee1e
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c
@@ -0,0 +1,38 @@
+/* Commit an elided pthread lock.
+   Copyright (C) 2014 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 <pthreadP.h>
+#include <lowlevellock.h>
+
+int
+__lll_unlock_elision(int *futex, int private)
+{
+  /* If the lock is free, we elided the lock earlier.  This does not
+     necessarily mean that we are in a transaction, because the user code may
+     have closed the transaction, but that is impossible to detect reliably.  */
+  if (*futex == 0)
+    {
+      __asm__ volatile (".machinemode \"zarch_nohighgprs\"\n\t"
+			".machine \"all\""
+			: : : "memory");
+      __builtin_tend();
+    }
+  else
+    lll_unlock ((*futex), private);
+  return 0;
+}