1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/pthread/mtx_init.c b/sysdeps/pthread/mtx_init.c
new file mode 100644
index 0000000000..436a03673e
--- /dev/null
+++ b/sysdeps/pthread/mtx_init.c
@@ -0,0 +1,53 @@
+/* C11 threads mutex initialization implementation.
+   Copyright (C) 2018-2020 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdalign.h>
+
+#include "thrd_priv.h"
+
+int
+mtx_init (mtx_t *mutex, int type)
+{
+  _Static_assert (sizeof (mtx_t) == sizeof (pthread_mutex_t),
+		  "sizeof (mtx_t) != sizeof (pthread_mutex_t)");
+  _Static_assert (alignof (mtx_t) == alignof (pthread_mutex_t),
+		  "alignof (mtx_t) != alignof (pthread_mutex_t)");
+
+  pthread_mutexattr_t attr;
+
+  __pthread_mutexattr_init (&attr);
+
+  /* Another possible solution would be to set the flags directly in
+     mutex object. */
+  switch (type)
+  {
+    case mtx_plain | mtx_recursive:
+    case mtx_timed | mtx_recursive:
+      __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
+      break;
+    case mtx_plain:
+    case mtx_timed: /* No difference between both in standard */
+    default:
+      __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_NORMAL);
+      break;
+  }
+
+  int err_code = __pthread_mutex_init ((pthread_mutex_t *) mutex, &attr);
+  /* pthread_mutexattr_destroy implementation is a noop.  */
+  return thrd_err_map (err_code);
+}