1 files changed, 77 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/htl/pt-mutex-transfer-np.c b/sysdeps/mach/hurd/htl/pt-mutex-transfer-np.c
new file mode 100644
index 0000000000..e89c8dcac7
--- /dev/null
+++ b/sysdeps/mach/hurd/htl/pt-mutex-transfer-np.c
@@ -0,0 +1,77 @@
+/* pthread_mutex_transfer_np.  Transfer mutex ownership to another thread.
+   Hurd version.
+   Copyright (C) 2016-2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This program 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.
+
+   This program 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 this program; 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_transfer_np (pthread_mutex_t *mtxp, pthread_t th)
+{
+  struct __pthread *self = _pthread_self ();
+  struct __pthread *pt = __pthread_getid (th);
+
+  if (pt == NULL)
+    return ESRCH;
+  else if (pt == self)
+    return 0;
+
+  int ret = 0;
+  int flags = mtxp->__flags & GSYNC_SHARED;
+
+  switch (MTX_TYPE (mtxp))
+    {
+    case PT_MTX_NORMAL:
+      break;
+
+    case PT_MTX_RECURSIVE:
+    case PT_MTX_ERRORCHECK:
+      if (!mtx_owned_p (mtxp, self, flags))
+	ret = EPERM;
+      else
+	mtx_set_owner (mtxp, pt, flags);
+
+      break;
+
+    case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
+    case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
+    case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
+      /* Note that this can be used to transfer an inconsistent
+       * mutex as well. The new owner will still have the same
+       * flags as the original. */
+      if (mtxp->__owner_id != self->thread ||
+	  (int) (mtxp->__lock & LLL_OWNER_MASK) != __getpid ())
+	ret = EPERM;
+      else
+	mtxp->__owner_id = pt->thread;
+
+      break;
+
+    default:
+      ret = EINVAL;
+    }
+
+  return ret;
+}
+
+weak_alias (__pthread_mutex_transfer_np, pthread_mutex_transfer_np)