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Diffstat (limited to 'gcc-4.8/gcc/ada/a-dynpri.adb')
-rw-r--r-- | gcc-4.8/gcc/ada/a-dynpri.adb | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/gcc-4.8/gcc/ada/a-dynpri.adb b/gcc-4.8/gcc/ada/a-dynpri.adb deleted file mode 100644 index 4e67934b7..000000000 --- a/gcc-4.8/gcc/ada/a-dynpri.adb +++ /dev/null @@ -1,164 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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; |