--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnarl/a-synbar__posix.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,111 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--             A D A . S Y N C H R O N O U S _ B A R R I E R S              --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the  contents of the part following the private keyword. --
+--                                                                          --
+-- 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 is the body of this package using POSIX barriers
+
+with Interfaces.C; use Interfaces.C;
+
+package body Ada.Synchronous_Barriers is
+
+   --------------------
+   -- POSIX barriers --
+   --------------------
+
+   function pthread_barrier_init
+     (barrier : not null access pthread_barrier_t;
+      attr    : System.Address := System.Null_Address;
+      count   : unsigned) return int;
+   pragma Import (C, pthread_barrier_init, "pthread_barrier_init");
+   --  Initialize barrier with the attributes in attr. The barrier is opened
+   --  when count waiters arrived. If attr is null the default barrier
+   --  attributes are used.
+
+   function pthread_barrier_destroy
+     (barrier : not null access pthread_barrier_t) return int;
+   pragma Import (C, pthread_barrier_destroy, "pthread_barrier_destroy");
+   --  Destroy a previously dynamically initialized barrier
+
+   function pthread_barrier_wait
+     (barrier : not null access pthread_barrier_t) return int;
+   pragma Import (C, pthread_barrier_wait, "pthread_barrier_wait");
+   --  Wait on barrier
+
+   --------------
+   -- Finalize --
+   --------------
+
+   overriding procedure Finalize (Barrier : in out Synchronous_Barrier) is
+      Result : int;
+   begin
+      Result := pthread_barrier_destroy (Barrier.POSIX_Barrier'Access);
+      pragma Assert (Result = 0);
+   end Finalize;
+
+   overriding procedure Initialize (Barrier : in out Synchronous_Barrier) is
+      Result : int;
+   begin
+      Result :=
+        pthread_barrier_init
+          (barrier => Barrier.POSIX_Barrier'Access,
+           attr    => System.Null_Address,
+           count   => unsigned (Barrier.Release_Threshold));
+      pragma Assert (Result = 0);
+   end Initialize;
+
+   ----------------------
+   -- Wait_For_Release --
+   ----------------------
+
+   procedure Wait_For_Release
+     (The_Barrier : in out Synchronous_Barrier;
+      Notified    : out Boolean)
+   is
+      Result : int;
+
+      PTHREAD_BARRIER_SERIAL_THREAD : constant := -1;
+      --  Value used to indicate the task which receives the notification for
+      --  the barrier open.
+
+   begin
+      Result :=
+        pthread_barrier_wait
+          (barrier => The_Barrier.POSIX_Barrier'Access);
+      pragma Assert
+        (Result = 0 or else Result = PTHREAD_BARRIER_SERIAL_THREAD);
+
+      Notified := (Result = PTHREAD_BARRIER_SERIAL_THREAD);
+   end Wait_For_Release;
+
+end Ada.Synchronous_Barriers;