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1 files changed, 164 insertions, 0 deletions

diff --git a/gcc/ada/a-dynpri.adb b/gcc/ada/a-dynpri.adb
new file mode 100644
index 000000000..9116a5739
--- /dev/null
+++ b/gcc/ada/a-dynpri.adb
@@ -0,0 +1,164 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                  GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                --
+--                                                                          --
+--                 A D A . D Y N A M I C _ P R I O R I T I E S              --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNARL 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/>.                                          --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University.       --
+-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Task_Primitives.Operations;
+with System.Tasking;
+with System.Parameters;
+with System.Soft_Links;
+
+with Ada.Unchecked_Conversion;
+
+package body Ada.Dynamic_Priorities is
+
+   package STPO renames System.Task_Primitives.Operations;
+   package SSL renames System.Soft_Links;
+
+   use System.Parameters;
+   use System.Tasking;
+
+   function Convert_Ids is new
+     Ada.Unchecked_Conversion
+       (Task_Identification.Task_Id, System.Tasking.Task_Id);
+
+   ------------------
+   -- Get_Priority --
+   ------------------
+
+   --  Inquire base priority of a task
+
+   function Get_Priority
+     (T : Ada.Task_Identification.Task_Id :=
+        Ada.Task_Identification.Current_Task) return System.Any_Priority
+   is
+      Target : constant Task_Id := Convert_Ids (T);
+      Error_Message : constant String := "Trying to get the priority of a ";
+
+   begin
+      if Target = Convert_Ids (Ada.Task_Identification.Null_Task_Id) then
+         raise Program_Error with Error_Message & "null task";
+      end if;
+
+      if Task_Identification.Is_Terminated (T) then
+         raise Tasking_Error with Error_Message & "terminated task";
+      end if;
+
+      return Target.Common.Base_Priority;
+   end Get_Priority;
+
+   ------------------
+   -- Set_Priority --
+   ------------------
+
+   --  Change base priority of a task dynamically
+
+   procedure Set_Priority
+     (Priority : System.Any_Priority;
+      T        : Ada.Task_Identification.Task_Id :=
+                   Ada.Task_Identification.Current_Task)
+   is
+      Target        : constant Task_Id := Convert_Ids (T);
+      Error_Message : constant String := "Trying to set the priority of a ";
+      Yield_Needed  : Boolean;
+
+   begin
+      if Target = Convert_Ids (Ada.Task_Identification.Null_Task_Id) then
+         raise Program_Error with Error_Message & "null task";
+      end if;
+
+      --  Setting the priority of an already-terminated task doesn't do
+      --  anything (see RM-D.5.1(7)). Note that Get_Priority is different in
+      --  this regard.
+
+      if Task_Identification.Is_Terminated (T) then
+         return;
+      end if;
+
+      SSL.Abort_Defer.all;
+
+      if Single_Lock then
+         STPO.Lock_RTS;
+      end if;
+
+      STPO.Write_Lock (Target);
+
+      Target.Common.Base_Priority := Priority;
+
+      if Target.Common.Call /= null
+        and then
+          Target.Common.Call.Acceptor_Prev_Priority /= Priority_Not_Boosted
+      then
+         --  Target is within a rendezvous, so ensure the correct priority
+         --  will be reset when finishing the rendezvous, and only change the
+         --  priority immediately if the new priority is greater than the
+         --  current (inherited) priority.
+
+         Target.Common.Call.Acceptor_Prev_Priority := Priority;
+
+         if Priority >= Target.Common.Current_Priority then
+            Yield_Needed := True;
+            STPO.Set_Priority (Target, Priority);
+         else
+            Yield_Needed := False;
+         end if;
+
+      else
+         Yield_Needed := True;
+         STPO.Set_Priority (Target, Priority);
+
+         if Target.Common.State = Entry_Caller_Sleep then
+            Target.Pending_Priority_Change := True;
+            STPO.Wakeup (Target, Target.Common.State);
+         end if;
+      end if;
+
+      STPO.Unlock (Target);
+
+      if Single_Lock then
+         STPO.Unlock_RTS;
+      end if;
+
+      if STPO.Self = Target and then Yield_Needed then
+
+         --  Yield is needed to enforce FIFO task dispatching
+
+         --  LL Set_Priority is made while holding the RTS lock so that it is
+         --  inheriting high priority until it release all the RTS locks.
+
+         --  If this is used in a system where Ceiling Locking is not enforced
+         --  we may end up getting two Yield effects.
+
+         STPO.Yield;
+      end if;
+
+      SSL.Abort_Undefer.all;
+   end Set_Priority;
+
+end Ada.Dynamic_Priorities;