+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA 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 . --
--- E N T R I E S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1 $
--- --
--- Copyright (C) 1991-2001, Florida State University --
--- --
--- 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- This package contains all the simple primitives related to
--- Protected_Objects with entries (i.e init, lock, unlock).
-
--- The handling of protected objects with no entries is done in
--- System.Tasking.Protected_Objects, the complex routines for protected
--- objects with entries in System.Tasking.Protected_Objects.Operations.
--- The split between Entries and Operations is needed to break circular
--- dependencies inside the run time.
-
--- Note: the compiler generates direct calls to this interface, via Rtsfind.
-
-with Ada.Exceptions;
--- used for Exception_Occurrence_Access
-
-with System.Task_Primitives.Operations;
--- used for Initialize_Lock
--- Write_Lock
--- Unlock
--- Get_Priority
--- Wakeup
-
-with System.Tasking.Initialization;
--- used for Defer_Abort,
--- Undefer_Abort,
--- Change_Base_Priority
-
-pragma Elaborate_All (System.Tasking.Initialization);
--- this insures that tasking is initialized if any protected objects are
--- created.
-
-package body System.Tasking.Protected_Objects.Entries is
-
- package STPO renames System.Task_Primitives.Operations;
-
- use Ada.Exceptions;
- use STPO;
-
- Locking_Policy : Character;
- pragma Import (C, Locking_Policy, "__gl_locking_policy");
-
- --------------
- -- Finalize --
- --------------
-
- procedure Finalize (Object : in out Protection_Entries) is
- Entry_Call : Entry_Call_Link;
- Caller : Task_ID;
- Ceiling_Violation : Boolean;
- Self_ID : constant Task_ID := STPO.Self;
- Old_Base_Priority : System.Any_Priority;
-
- begin
- if Object.Finalized then
- return;
- end if;
-
- STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation);
-
- if Ceiling_Violation then
-
- -- Dip our own priority down to ceiling of lock.
- -- See similar code in Tasking.Entry_Calls.Lock_Server.
-
- STPO.Write_Lock (Self_ID);
- Old_Base_Priority := Self_ID.Common.Base_Priority;
- Self_ID.New_Base_Priority := Object.Ceiling;
- Initialization.Change_Base_Priority (Self_ID);
- STPO.Unlock (Self_ID);
- STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation);
-
- if Ceiling_Violation then
- Raise_Exception (Program_Error'Identity, "Ceiling Violation");
- end if;
-
- Object.Old_Base_Priority := Old_Base_Priority;
- Object.Pending_Action := True;
- end if;
-
- -- Send program_error to all tasks still queued on this object.
-
- for E in Object.Entry_Queues'Range loop
- Entry_Call := Object.Entry_Queues (E).Head;
-
- while Entry_Call /= null loop
- Caller := Entry_Call.Self;
- Entry_Call.Exception_To_Raise := Program_Error'Identity;
- STPO.Write_Lock (Caller);
- Initialization.Wakeup_Entry_Caller (Self_ID, Entry_Call, Done);
- STPO.Unlock (Caller);
- exit when Entry_Call = Object.Entry_Queues (E).Tail;
- Entry_Call := Entry_Call.Next;
- end loop;
- end loop;
-
- Object.Finalized := True;
- STPO.Unlock (Object.L'Unrestricted_Access);
- STPO.Finalize_Lock (Object.L'Unrestricted_Access);
- end Finalize;
-
- -------------------------------------
- -- Has_Interrupt_Or_Attach_Handler --
- -------------------------------------
-
- function Has_Interrupt_Or_Attach_Handler
- (Object : Protection_Entries_Access)
- return Boolean
- is
- begin
- return False;
- end Has_Interrupt_Or_Attach_Handler;
-
- -----------------------------------
- -- Initialize_Protection_Entries --
- -----------------------------------
-
- procedure Initialize_Protection_Entries
- (Object : Protection_Entries_Access;
- Ceiling_Priority : Integer;
- Compiler_Info : System.Address;
- Entry_Bodies : Protected_Entry_Body_Access;
- Find_Body_Index : Find_Body_Index_Access)
- is
- Init_Priority : Integer := Ceiling_Priority;
- Self_ID : constant Task_ID := STPO.Self;
-
- begin
- if Init_Priority = Unspecified_Priority then
- Init_Priority := System.Priority'Last;
- end if;
-
- if Locking_Policy = 'C'
- and then Has_Interrupt_Or_Attach_Handler (Object)
- and then Init_Priority not in System.Interrupt_Priority
- then
- -- Required by C.3.1(11)
-
- raise Program_Error;
- end if;
-
- Initialization.Defer_Abort (Self_ID);
- Initialize_Lock (Init_Priority, Object.L'Access);
- Initialization.Undefer_Abort (Self_ID);
- Object.Ceiling := System.Any_Priority (Init_Priority);
- Object.Compiler_Info := Compiler_Info;
- Object.Pending_Action := False;
- Object.Call_In_Progress := null;
- Object.Entry_Bodies := Entry_Bodies;
- Object.Find_Body_Index := Find_Body_Index;
-
- for E in Object.Entry_Queues'Range loop
- Object.Entry_Queues (E).Head := null;
- Object.Entry_Queues (E).Tail := null;
- end loop;
- end Initialize_Protection_Entries;
-
- ------------------
- -- Lock_Entries --
- ------------------
-
- procedure Lock_Entries
- (Object : Protection_Entries_Access; Ceiling_Violation : out Boolean) is
- begin
- -- The lock is made without defering abortion.
-
- -- Therefore the abortion 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 abortion, and compiler
- -- generated calls must be protected with cleanup handlers to ensure
- -- that abortion is undeferred in all cases.
-
- pragma Assert (STPO.Self.Deferral_Level > 0);
- Write_Lock (Object.L'Access, Ceiling_Violation);
- end Lock_Entries;
-
- procedure Lock_Entries (Object : Protection_Entries_Access) is
- Ceiling_Violation : Boolean;
- begin
- pragma Assert (STPO.Self.Deferral_Level > 0);
- Write_Lock (Object.L'Access, Ceiling_Violation);
-
- if Ceiling_Violation then
- Raise_Exception (Program_Error'Identity, "Ceiling Violation");
- end if;
- end Lock_Entries;
-
- ----------------------------
- -- Lock_Read_Only_Entries --
- ----------------------------
-
- procedure Lock_Read_Only_Entries (Object : Protection_Entries_Access) is
- Ceiling_Violation : Boolean;
- begin
- Read_Lock (Object.L'Access, Ceiling_Violation);
-
- if Ceiling_Violation then
- Raise_Exception (Program_Error'Identity, "Ceiling Violation");
- end if;
- end Lock_Read_Only_Entries;
-
- --------------------
- -- Unlock_Entries --
- --------------------
-
- procedure Unlock_Entries (Object : Protection_Entries_Access) is
- begin
- Unlock (Object.L'Access);
- end Unlock_Entries;
-
-end System.Tasking.Protected_Objects.Entries;
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