1 files changed, 43 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
new file mode 100644
index 0000000000..e3fe58e3f1
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
@@ -0,0 +1,43 @@
+/* elision-unlock.c: Commit an elided pthread lock.
+   Copyright (C) 2015-2017 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"
+#include "htm.h"
+
+int
+__lll_unlock_elision (int *lock, short *adapt_count, int pshared)
+{
+  /* When the lock was free we're in a transaction.  */
+  if (*lock == 0)
+    __libc_tend (0);
+  else
+    {
+      /* Update adapt_count in the critical section to prevent a
+	 write-after-destroy error as mentioned in BZ 20822.  The
+	 following update of adapt_count has to be contained within
+	 the critical region of the fall-back lock in order to not violate
+	 the mutex destruction requirements.  */
+      short __tmp = atomic_load_relaxed (adapt_count);
+      if (__tmp > 0)
+	atomic_store_relaxed (adapt_count, __tmp - 1);
+
+      lll_unlock ((*lock), pshared);
+    }
+  return 0;
+}