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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . P A R A M E T E R S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2011, 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 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/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the OpenVMS Alpha version
+
+-- 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;
+
+ ---------------------------------------
+ -- 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 Percentage is Size_Type range -1 .. 100;
+ Dynamic : constant Size_Type := -1;
+ -- 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_Percentage : constant Percentage := Dynamic;
+ -- This constant defines the handling of the secondary stack
+
+ Sec_Stack_Dynamic : constant Boolean := Sec_Stack_Percentage = 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
+
+ Default_Env_Stack_Size : constant Size_Type := 8_192_000;
+ -- Assumed size of the environment task, if no other information
+ -- is available. This value is used when stack checking is
+ -- enabled and no GNAT_STACK_LIMIT environment variable is set.
+
+ 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 := 32;
+ -- 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.
+
+ ptr_bits : constant := 32;
+ subtype C_Address is System.Address
+ range -2 ** (ptr_bits - 1) .. 2 ** (ptr_bits - 1) - 1;
+ for C_Address'Object_Size use ptr_bits;
+ -- Number of bits in Interfaces.C pointers, normally a standard address,
+ -- except on 64-bit VMS where they are 32-bit addresses, for compatibility
+ -- with legacy code. System.Aux_DEC.Short_Address can't be used because of
+ -- elaboration circularity.
+
+ C_Malloc_Linkname : constant String := "__gnat_malloc32";
+ -- Name of runtime function used to allocate such a pointer
+
+ ----------------------------------------------
+ -- 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 omitted only for outer level objects 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)
+
+ ---------------------
+ -- Tasking Profile --
+ ---------------------
+
+ -- In the following sections, constant parameters are defined to
+ -- allow some optimizations and fine tuning within the tasking run time
+ -- based on restrictions on the tasking features.
+
+ ----------------------
+ -- Locking Strategy --
+ ----------------------
+
+ Single_Lock : constant Boolean := True;
+ -- Indicates whether a single lock should be used within the tasking
+ -- run-time to protect internal structures. If True, a single lock
+ -- will be used, meaning less locking/unlocking operations, but also
+ -- more global contention. In general, Single_Lock should be set to
+ -- True on single processor machines, and to False to multi-processor
+ -- systems, but this can vary from application to application and also
+ -- depends on the scheduling policy.
+
+ -------------------
+ -- Task Abortion --
+ -------------------
+
+ No_Abort : constant Boolean := False;
+ -- This constant indicates whether abort statements and asynchronous
+ -- transfer of control (ATC) are disallowed. If set to True, it is
+ -- assumed that neither construct is used, and the run time does not
+ -- need to defer/undefer abort and check for pending actions at
+ -- completion points. A value of True for No_Abort corresponds to:
+ -- pragma Restrictions (No_Abort_Statements);
+ -- pragma Restrictions (Max_Asynchronous_Select_Nesting => 0);
+
+ ---------------------
+ -- Task Attributes --
+ ---------------------
+
+ Default_Attribute_Count : constant := 4;
+ -- Number of pre-allocated Address-sized task attributes stored in the
+ -- task control block.
+
+ --------------------
+ -- Runtime Traces --
+ --------------------
+
+ Runtime_Traces : constant Boolean := False;
+ -- This constant indicates whether the runtime outputs traces to a
+ -- predefined output or not (True means that traces are output).
+ -- See System.Traces for more details.
+
+ -----------------------
+ -- Task Image Length --
+ -----------------------
+
+ Max_Task_Image_Length : constant := 256;
+ -- This constant specifies the maximum length of a task's image
+
+ ------------------------------
+ -- Exception Message Length --
+ ------------------------------
+
+ Default_Exception_Msg_Max_Length : constant := 512;
+ -- This constant specifies the maximum number of characters to allow in an
+ -- exception message (see RM 11.4.1(18)). The value for VMS exceeds the
+ -- default minimum of 200 to allow for the length of chained VMS condition
+ -- handling messages.
+
+end System.Parameters;