--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnarl/thread.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,88 @@
+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                              P T H R E A D                               *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *          Copyright (C) 2011-2017, Free Software Foundation, Inc.         *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 3,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
+ * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
+ *                                                                          *
+ * As a special exception under Section 7 of GPL version 3, you are granted *
+ * additional permissions described in the GCC Runtime Library Exception,   *
+ * version 3.1, as published by the Free Software Foundation.               *
+ *                                                                          *
+ * You should have received a copy of the GNU General Public License and    *
+ * a copy of the GCC Runtime Library Exception along with this program;     *
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
+ * <http://www.gnu.org/licenses/>.                                          *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+/*  This file provides utility functions to access the threads API          */
+
+#include "s-oscons.h"
+
+/* If the clock we used for tasking (CLOCK_RT_Ada) is not the default
+ * CLOCK_REALTIME, we need to set cond var attributes accordingly.
+ */
+#if CLOCK_RT_Ada != CLOCK_REALTIME
+# include <pthread.h>
+# include <time.h>
+
+int
+__gnat_pthread_condattr_setup(pthread_condattr_t *attr) {
+  return pthread_condattr_setclock (attr, CLOCK_RT_Ada);
+}
+
+#else
+
+int
+__gnat_pthread_condattr_setup (void *attr) {
+  /* Dummy version for other platforms, which may or may not have pthread.h */
+  return 0;
+}
+
+#endif
+
+#if defined (__APPLE__)
+#include <mach/mach.h>
+#include <mach/clock.h>
+#endif
+
+/* Return the clock ticks per nanosecond for Posix systems lacking the
+   Posix extension function clock_getres, or else 0 nsecs on error.  */
+
+int
+__gnat_clock_get_res (void)
+{
+#if defined (__APPLE__)
+  clock_serv_t clock_port;
+  mach_msg_type_number_t count;
+  int nsecs;
+  int result;
+
+  count = 1;
+  result = host_get_clock_service
+    (mach_host_self (), SYSTEM_CLOCK, &clock_port);
+
+  if (result == KERN_SUCCESS)
+    result = clock_get_attributes (clock_port, CLOCK_GET_TIME_RES,
+      (clock_attr_t) &nsecs, &count);
+
+  if (result == KERN_SUCCESS)
+    return nsecs;
+#endif
+
+  return 0;
+}