| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . P A R A M E T E R S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- $Revision$ |
| -- -- |
| -- Copyright (C) 1992-2001 Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT 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. 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; 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. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is the RT-GNU/Linux version. |
| -- Blank line intentional so that it lines up exactly with default. |
| |
| -- This package defines some system dependent parameters for GNAT. These |
| -- are values that are referenced by the runtime library and are therefore |
| -- relevant to the target machine. |
| |
| -- The parameters whose value is defined in the spec are not generally |
| -- expected to be changed. If they are changed, it will be necessary to |
| -- recompile the run-time library. |
| |
| -- The parameters which are defined by functions can be changed by modifying |
| -- the body of System.Parameters in file s-parame.adb. A change to this body |
| -- requires only rebinding and relinking of the application. |
| |
| -- Note: do not introduce any pragma Inline statements into this unit, since |
| -- otherwise the relinking and rebinding capability would be deactivated. |
| |
| package System.Parameters is |
| pragma Pure (Parameters); |
| |
| --------------------------------------- |
| -- Task And Stack Allocation Control -- |
| --------------------------------------- |
| |
| type Task_Storage_Size is new Integer; |
| -- Type used in tasking units for task storage size |
| |
| type Size_Type is new Task_Storage_Size; |
| -- Type used to provide task storage size to runtime |
| |
| Unspecified_Size : constant Size_Type := Size_Type'First; |
| -- Value used to indicate that no size type is set |
| |
| subtype Ratio is Size_Type range -1 .. 100; |
| Dynamic : constant Size_Type := 10; |
| -- The secondary stack ratio is a constant between 0 and 100 which |
| -- determines the percentage of the allocated task stack that is |
| -- used by the secondary stack (the rest being the primary stack). |
| -- The special value of minus one indicates that the secondary |
| -- stack is to be allocated from the heap instead. |
| |
| Sec_Stack_Ratio : constant Ratio := Dynamic; |
| -- This constant defines the handling of the secondary stack |
| |
| Sec_Stack_Dynamic : constant Boolean := Sec_Stack_Ratio = Dynamic; |
| -- Convenient Boolean for testing for dynamic secondary stack |
| |
| function Default_Stack_Size return Size_Type; |
| -- Default task stack size used if none is specified |
| |
| function Minimum_Stack_Size return Size_Type; |
| -- Minimum task stack size permitted |
| |
| function Adjust_Storage_Size (Size : Size_Type) return Size_Type; |
| -- Given the storage size stored in the TCB, return the Storage_Size |
| -- value required by the RM for the Storage_Size attribute. The |
| -- required adjustment is as follows: |
| -- |
| -- when Size = Unspecified_Size, return Default_Stack_Size |
| -- when Size < Minimum_Stack_Size, return Minimum_Stack_Size |
| -- otherwise return given Size |
| |
| Stack_Grows_Down : constant Boolean := True; |
| -- This constant indicates whether the stack grows up (False) or |
| -- down (True) in memory as functions are called. It is used for |
| -- proper implementation of the stack overflow check. |
| |
| ---------------------------------------------- |
| -- Characteristics of types in Interfaces.C -- |
| ---------------------------------------------- |
| |
| long_bits : constant := Long_Integer'Size; |
| -- Number of bits in type long and unsigned_long. The normal convention |
| -- is that this is the same as type Long_Integer, but this is not true |
| -- of all targets. For example, in OpenVMS long /= Long_Integer. |
| |
| ---------------------------------------------- |
| -- Behavior of Pragma Finalize_Storage_Only -- |
| ---------------------------------------------- |
| |
| -- Garbage_Collected is a Boolean constant whose value indicates the |
| -- effect of the pragma Finalize_Storage_Entry on a controlled type. |
| |
| -- Garbage_Collected = False |
| |
| -- The system releases all storage on program termination only, |
| -- but not other garbage collection occurs, so finalization calls |
| -- are ommitted only for outer level onjects can be omitted if |
| -- pragma Finalize_Storage_Only is used. |
| |
| -- Garbage_Collected = True |
| |
| -- The system provides full garbage collection, so it is never |
| -- necessary to release storage for controlled objects for which |
| -- a pragma Finalize_Storage_Only is used. |
| |
| Garbage_Collected : constant Boolean := False; |
| -- The storage mode for this system (release on program exit) |
| |
| end System.Parameters; |