1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/htl/pt-mutex-consistent.c b/sysdeps/mach/hurd/htl/pt-mutex-consistent.c
new file mode 100644
index 0000000000..e02f959a57
--- /dev/null
+++ b/sysdeps/mach/hurd/htl/pt-mutex-consistent.c
@@ -0,0 +1,47 @@
+/* pthread_mutex_consistent.  Hurd version.
+   Copyright (C) 2016-2018 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 <stdlib.h>
+#include <assert.h>
+#include <pt-internal.h>
+#include "pt-mutex.h"
+#include <hurdlock.h>
+
+int
+pthread_mutex_consistent (pthread_mutex_t *mtxp)
+{
+  int ret = EINVAL;
+  unsigned int val = mtxp->__lock;
+
+  if ((mtxp->__flags & PTHREAD_MUTEX_ROBUST) != 0 &&
+      (val & LLL_DEAD_OWNER) != 0 &&
+      atomic_compare_and_exchange_bool_acq (&mtxp->__lock,
+					    __getpid () | LLL_WAITERS,
+					    val) == 0)
+    {
+      /* The mutex is now ours, and it's consistent. */
+      mtxp->__owner_id = _pthread_self ()->thread;
+      mtxp->__cnt = 1;
+      ret = 0;
+    }
+
+  return ret;
+}
+
+weak_alias (pthread_mutex_consistent, pthread_mutex_consistent_np)