2011-08-29 Tristan Gingold <gingold@adacore.com>

	* s-interr-hwint.adb: Revert previous patch (defer aborts in ZCX case).

2011-08-29  Geert Bosch  <bosch@adacore.com>

	* a-ngelfu.adb (Tan): Do not raise Constraint_Error if the argument is
	the closest machine number to Pi / 2.0.

2011-08-29  Jose Ruiz  <ruiz@adacore.com>

	* impunit.adb (Non_Imp_File_Names_12): Add a-synbar for new Ada 2012
	package Ada.Synchronous_Barriers.
	* a-synbar.ads, a-synbar.adb, a-synbar-posix.ads, a-synbar-posix.adb:
	Add new specs and bodies for Ada.Synchronous_Barriers. There is a
	default implementation using protected objects and another one
	a-synbar-posix using POSIX barriers as the underlying support.
	* gcc-interface/Makefile.in (LIBGNAT_TARGET_PAIRS for Linux (x86,
	x86_64, ia64) and MIPS IRIX): Use the a-synbar-posix implementation of
	Ada.Synchronous_Barriers which uses POSIX barriers (more efficient).
	* Makefile.rtl (GNATRTL_TASKING_OBJS): Add a-synbar.o



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@178200 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 71 insertions, 0 deletions

diff --git a/gcc/ada/a-synbar.adb b/gcc/ada/a-synbar.adb
new file mode 100644
index 00000000000..8efaef6d036
--- /dev/null
+++ b/gcc/ada/a-synbar.adb
@@ -0,0 +1,71 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         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) 1992-2011, 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package body Ada.Synchronous_Barriers is
+
+   protected body Synchronous_Barrier is
+      --  The condition "Wait'Count = Release_Threshold" opens the barrier when
+      --  the required number of tasks is reached. The condition "Keep_Open"
+      --  leaves the barrier open while there are queued tasks. While there are
+      --  tasks in the queue no new task will be queued, guaranteeing that the
+      --  barrier will remain open only for those tasks already inside.
+
+      entry Wait (Notified : out Boolean)
+        when Wait'Count = Release_Threshold or else Keep_Open is
+      begin
+         --  If we are executing the entry it means that the required number
+         --  of tasks have been queued in the entry. Keep_Open barrier will
+         --  remain true until all queued tasks are out.
+
+         Keep_Open := Wait'Count > 0;
+
+         --  The last released task will close the barrier and get the
+         --  Notified token.
+
+         Notified := Wait'Count = 0;
+      end Wait;
+   end Synchronous_Barrier;
+
+   ----------------------
+   -- Wait_For_Release --
+   ----------------------
+
+   procedure Wait_For_Release
+     (The_Barrier : in out Synchronous_Barrier;
+      Notified    : out    Boolean) is
+   begin
+      The_Barrier.Wait (Notified);
+   end Wait_For_Release;
+end Ada.Synchronous_Barriers;