6cbcc54138
* xeinfo.adb: Don't look for revision numbers. * xnmake.adb: Likewise. * xsinfo.adb: Likewise. * xsnames.adb: Likewise. * xtreeprs.adb: Likewise. From-SVN: r50768
286 lines
10 KiB
Ada
286 lines
10 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
|
|
-- --
|
|
-- SYSTEM.TASKING.PROTECTED_OBJECTS.ENTRIES --
|
|
-- --
|
|
-- B o d y --
|
|
-- --
|
|
-- --
|
|
-- Copyright (C) 1998-2001, 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 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. (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.
|
|
|
|
with System.Parameters;
|
|
-- used for Single_Lock
|
|
|
|
package body System.Tasking.Protected_Objects.Entries is
|
|
|
|
package STPO renames System.Task_Primitives.Operations;
|
|
|
|
use Parameters;
|
|
use Task_Primitives.Operations;
|
|
use Ada.Exceptions;
|
|
|
|
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 Single_Lock then
|
|
Lock_RTS;
|
|
end if;
|
|
|
|
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);
|
|
|
|
if Single_Lock then
|
|
Unlock_RTS;
|
|
end if;
|
|
|
|
STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation);
|
|
|
|
if Ceiling_Violation then
|
|
Raise_Exception (Program_Error'Identity, "Ceiling Violation");
|
|
end if;
|
|
|
|
if Single_Lock then
|
|
Lock_RTS;
|
|
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;
|
|
|
|
if Single_Lock then
|
|
Unlock_RTS;
|
|
end if;
|
|
|
|
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
|
|
pragma Warnings (Off, Object);
|
|
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
|
|
if Object.Finalized then
|
|
Raise_Exception
|
|
(Program_Error'Identity, "Protected Object is finalized");
|
|
end if;
|
|
|
|
-- 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
|
|
if Object.Finalized then
|
|
Raise_Exception
|
|
(Program_Error'Identity, "Protected Object is finalized");
|
|
end if;
|
|
|
|
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
|
|
if Object.Finalized then
|
|
Raise_Exception
|
|
(Program_Error'Identity, "Protected Object is finalized");
|
|
end if;
|
|
|
|
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;
|