| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- 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 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1999-2005 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, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, 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. -- |
| -- Extensive contributions were provided by Ada Core Technologies, Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This package provides a implementation of stack checking operations |
| -- using comparison with stack base and limit. |
| |
| pragma Restrictions (No_Elaboration_Code); |
| -- We want to guarantee the absence of elaboration code because the |
| -- binder does not handle references to this package. |
| |
| pragma Polling (Off); |
| -- Turn off polling, we do not want polling to take place during stack |
| -- checking operations. It causes infinite loops and other problems. |
| |
| package System.Stack_Checking.Operations is |
| procedure Update_Stack_Cache (Stack : Stack_Access); |
| -- Set the stack cache for the current task. Note that this is only |
| -- for optimization purposes, nothing can be assumed about the |
| -- contents of the cache at any time, see Set_Stack_Info. |
| |
| procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access); |
| -- Invalidate cache entries for the task T that owns Any_Stack. |
| -- This causes the Set_Stack_Info function to be called during |
| -- the next stack check done by T. This can be used to interrupt |
| -- task T asynchronously. |
| -- Stack_Check should be called in loops for this to work reliably. |
| |
| function Stack_Check (Stack_Address : System.Address) return Stack_Access; |
| -- This version of Stack_Check should not be inlined. |
| |
| private |
| |
| Cache : aliased Stack_Access := Null_Stack; |
| |
| pragma Export (C, Cache, "_gnat_stack_cache"); |
| pragma Export (C, Stack_Check, "_gnat_stack_check"); |
| |
| end System.Stack_Checking.Operations; |
