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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . S T A C K _ C H E C K I N G . O P E R A T I O N S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1999-2005 Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package provides a implementation of stack checking operations
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-- using comparison with stack base and limit.
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pragma Restrictions (No_Elaboration_Code);
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-- We want to guarantee the absence of elaboration code because the
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-- binder does not handle references to this package.
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pragma Polling (Off);
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-- Turn off polling, we do not want polling to take place during stack
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-- checking operations. It causes infinite loops and other problems.
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package System.Stack_Checking.Operations is
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procedure Update_Stack_Cache (Stack : Stack_Access);
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-- Set the stack cache for the current task. Note that this is only
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-- for optimization purposes, nothing can be assumed about the
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-- contents of the cache at any time, see Set_Stack_Info.
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procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access);
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-- Invalidate cache entries for the task T that owns Any_Stack.
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-- This causes the Set_Stack_Info function to be called during
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-- the next stack check done by T. This can be used to interrupt
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-- task T asynchronously.
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-- Stack_Check should be called in loops for this to work reliably.
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function Stack_Check (Stack_Address : System.Address) return Stack_Access;
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-- This version of Stack_Check should not be inlined.
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private
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Cache : aliased Stack_Access := Null_Stack;
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pragma Export (C, Cache, "_gnat_stack_cache");
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pragma Export (C, Stack_Check, "_gnat_stack_check");
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end System.Stack_Checking.Operations;
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