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-------------------------------------------------------------------------------
--- --
--- 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) 1992-2012, 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;