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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- S Y S T E M . T A S K I N G . P R O T E C T E D _ O B J E C T S --
--- --
--- B o d y --
--- --
--- Copyright (C) 1991-1994, Florida State University --
--- Copyright (C) 1995-2008, AdaCore --
--- --
--- 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 2, or (at your option) any later ver- --
--- sion. GNARL 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. --
--- Extensive contributions were provided by Ada Core Technologies, Inc. --
--- --
-------------------------------------------------------------------------------
-
-pragma Polling (Off);
--- Turn off polling, we do not want ATC polling to take place during
--- tasking operations. It causes infinite loops and other problems.
-
-with System.Task_Primitives.Operations;
-with System.Parameters;
-with System.Traces;
-with System.Soft_Links.Tasking;
-
-package body System.Tasking.Protected_Objects is
-
- use System.Task_Primitives.Operations;
- use System.Traces;
-
- ----------------
- -- Local Data --
- ----------------
-
- Locking_Policy : Character;
- pragma Import (C, Locking_Policy, "__gl_locking_policy");
-
- -------------------------
- -- Finalize_Protection --
- -------------------------
-
- procedure Finalize_Protection (Object : in out Protection) is
- begin
- Finalize_Lock (Object.L'Unrestricted_Access);
- end Finalize_Protection;
-
- ---------------------------
- -- Initialize_Protection --
- ---------------------------
-
- procedure Initialize_Protection
- (Object : Protection_Access;
- Ceiling_Priority : Integer)
- is
- Init_Priority : Integer := Ceiling_Priority;
-
- begin
- if Init_Priority = Unspecified_Priority then
- Init_Priority := System.Priority'Last;
- end if;
-
- Initialize_Lock (Init_Priority, Object.L'Access);
- Object.Ceiling := System.Any_Priority (Init_Priority);
- Object.New_Ceiling := System.Any_Priority (Init_Priority);
- Object.Owner := Null_Task;
- end Initialize_Protection;
-
- -----------------
- -- Get_Ceiling --
- -----------------
-
- function Get_Ceiling
- (Object : Protection_Access) return System.Any_Priority is
- begin
- return Object.New_Ceiling;
- end Get_Ceiling;
-
- ----------
- -- Lock --
- ----------
-
- procedure Lock (Object : Protection_Access) is
- Ceiling_Violation : Boolean;
-
- begin
- -- The lock is made without deferring abort
-
- -- Therefore the abort has to be deferred before calling this routine.
- -- This means that the compiler has to generate a Defer_Abort call
- -- before the call to Lock.
-
- -- The caller is responsible for undeferring abort, and compiler
- -- generated calls must be protected with cleanup handlers to ensure
- -- that abort is undeferred in all cases.
-
- -- If pragma Detect_Blocking is active then, as described in the ARM
- -- 9.5.1, par. 15, we must check whether this is an external call on a
- -- protected subprogram with the same target object as that of the
- -- protected action that is currently in progress (i.e., if the caller
- -- is already the protected object's owner). If this is the case hence
- -- Program_Error must be raised.
-
- if Detect_Blocking and then Object.Owner = Self then
- raise Program_Error;
- end if;
-
- Write_Lock (Object.L'Access, Ceiling_Violation);
-
- if Parameters.Runtime_Traces then
- Send_Trace_Info (PO_Lock);
- end if;
-
- if Ceiling_Violation then
- raise Program_Error;
- end if;
-
- -- We are entering in a protected action, so that we increase the
- -- protected object nesting level (if pragma Detect_Blocking is
- -- active), and update the protected object's owner.
-
- if Detect_Blocking then
- declare
- Self_Id : constant Task_Id := Self;
- begin
- -- Update the protected object's owner
-
- Object.Owner := Self_Id;
-
- -- Increase protected object nesting level
-
- Self_Id.Common.Protected_Action_Nesting :=
- Self_Id.Common.Protected_Action_Nesting + 1;
- end;
- end if;
- end Lock;
-
- --------------------
- -- Lock_Read_Only --
- --------------------
-
- procedure Lock_Read_Only (Object : Protection_Access) is
- Ceiling_Violation : Boolean;
-
- begin
- -- If pragma Detect_Blocking is active then, as described in the ARM
- -- 9.5.1, par. 15, we must check whether this is an external call on
- -- protected subprogram with the same target object as that of the
- -- protected action that is currently in progress (i.e., if the caller
- -- is already the protected object's owner). If this is the case hence
- -- Program_Error must be raised.
- --
- -- Note that in this case (getting read access), several tasks may have
- -- read ownership of the protected object, so that this method of
- -- storing the (single) protected object's owner does not work reliably
- -- for read locks. However, this is the approach taken for two major
- -- reasons: first, this function is not currently being used (it is
- -- provided for possible future use), and second, it largely simplifies
- -- the implementation.
-
- if Detect_Blocking and then Object.Owner = Self then
- raise Program_Error;
- end if;
-
- Read_Lock (Object.L'Access, Ceiling_Violation);
-
- if Parameters.Runtime_Traces then
- Send_Trace_Info (PO_Lock);
- end if;
-
- if Ceiling_Violation then
- raise Program_Error;
- end if;
-
- -- We are entering in a protected action, so we increase the protected
- -- object nesting level (if pragma Detect_Blocking is active).
-
- if Detect_Blocking then
- declare
- Self_Id : constant Task_Id := Self;
- begin
- -- Update the protected object's owner
-
- Object.Owner := Self_Id;
-
- -- Increase protected object nesting level
-
- Self_Id.Common.Protected_Action_Nesting :=
- Self_Id.Common.Protected_Action_Nesting + 1;
- end;
- end if;
- end Lock_Read_Only;
-
- -----------------
- -- Set_Ceiling --
- -----------------
-
- procedure Set_Ceiling
- (Object : Protection_Access;
- Prio : System.Any_Priority) is
- begin
- Object.New_Ceiling := Prio;
- end Set_Ceiling;
-
- ------------
- -- Unlock --
- ------------
-
- procedure Unlock (Object : Protection_Access) is
- begin
- -- We are exiting from a protected action, so that we decrease the
- -- protected object nesting level (if pragma Detect_Blocking is
- -- active), and remove ownership of the protected object.
-
- if Detect_Blocking then
- declare
- Self_Id : constant Task_Id := Self;
-
- begin
- -- Calls to this procedure can only take place when being within
- -- a protected action and when the caller is the protected
- -- object's owner.
-
- pragma Assert (Self_Id.Common.Protected_Action_Nesting > 0
- and then Object.Owner = Self_Id);
-
- -- Remove ownership of the protected object
-
- Object.Owner := Null_Task;
-
- -- We are exiting from a protected action, so we decrease the
- -- protected object nesting level.
-
- Self_Id.Common.Protected_Action_Nesting :=
- Self_Id.Common.Protected_Action_Nesting - 1;
- end;
- end if;
-
- -- Before releasing the mutex we must actually update its ceiling
- -- priority if it has been changed.
-
- if Object.New_Ceiling /= Object.Ceiling then
- if Locking_Policy = 'C' then
- System.Task_Primitives.Operations.Set_Ceiling
- (Object.L'Access, Object.New_Ceiling);
- end if;
-
- Object.Ceiling := Object.New_Ceiling;
- end if;
-
- Unlock (Object.L'Access);
-
- if Parameters.Runtime_Traces then
- Send_Trace_Info (PO_Unlock);
- end if;
- end Unlock;
-
-begin
- -- Ensure that tasking is initialized, as well as tasking soft links
- -- when using protected objects.
-
- Tasking.Initialize;
- System.Soft_Links.Tasking.Init_Tasking_Soft_Links;
-end System.Tasking.Protected_Objects;