------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . I N T E R R U P T S --
-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2004 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, 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- --
+-- 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. 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. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- 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/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- Any changes to this interface may require corresponding compiler changes.
-- This package encapsulates the implementation of interrupt or signal
--- handlers. It is logically an extension of the body of Ada.Interrupts.
--- It is made a child of System to allow visibility of various
--- runtime system internal data and operations.
+-- handlers. It is logically an extension of the body of Ada.Interrupts. It
+-- is made a child of System to allow visibility of various runtime system
+-- internal data and operations.
--- See System.Interrupt_Management for core interrupt/signal interfaces.
+-- See System.Interrupt_Management for core interrupt/signal interfaces
--- These two packages are separated in order to allow
--- System.Interrupt_Management to be used without requiring the whole
--- tasking implementation to be linked and elaborated.
+-- These two packages are separated to allow System.Interrupt_Management to be
+-- used without requiring the whole tasking implementation to be linked and
+-- elaborated.
with System.Tasking;
--- used for Task_Id
-
with System.Tasking.Protected_Objects.Entries;
--- used for Protection_Entries
-
with System.OS_Interface;
--- used for Max_Interrupt
package System.Interrupts is
type Interrupt_ID is range 0 .. System.OS_Interface.Max_Interrupt;
- -- The following renaming is introduced so that the type is accessible
- -- through rtsfind, otherwise the name clashes with its homonym in
- -- ada.interrupts.
-
subtype System_Interrupt_Id is Interrupt_ID;
+ -- This synonym is introduced so that the type is accessible through
+ -- rtsfind, otherwise the name clashes with its homonym in Ada.Interrupts.
type Parameterless_Handler is access protected procedure;
function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean;
function Current_Handler
- (Interrupt : Interrupt_ID)
- return Parameterless_Handler;
+ (Interrupt : Interrupt_ID) return Parameterless_Handler;
- -- Calling the following procedures with New_Handler = null
- -- and Static = true means that we want to modify the current handler
- -- regardless of the previous handler's binding status.
- -- (i.e. we do not care whether it is a dynamic or static handler)
+ -- Calling the following procedures with New_Handler = null and Static =
+ -- true means that we want to modify the current handler regardless of the
+ -- previous handler's binding status. (i.e. we do not care whether it is a
+ -- dynamic or static handler)
procedure Attach_Handler
(New_Handler : Parameterless_Handler;
Static : Boolean := False);
function Reference
- (Interrupt : Interrupt_ID)
- return System.Address;
+ (Interrupt : Interrupt_ID) return System.Address;
--------------------------------
-- Interrupt Entries Services --
-- already bound to another entry, Program_Error will be raised.
procedure Detach_Interrupt_Entries (T : System.Tasking.Task_Id);
- -- This procedure detaches all the Interrupt Entries bound to a task.
+ -- This procedure detaches all the Interrupt Entries bound to a task
------------------------------
-- POSIX.5 Signals Services --
procedure Unblock_Interrupt (Interrupt : Interrupt_ID);
function Unblocked_By
- (Interrupt : Interrupt_ID)
- return System.Tasking.Task_Id;
+ (Interrupt : Interrupt_ID) return System.Tasking.Task_Id;
-- It returns the ID of the last Task which Unblocked this Interrupt.
- -- It returns Null_Task if no tasks have ever requested the
- -- Unblocking operation or the Interrupt is currently Blocked.
+ -- It returns Null_Task if no tasks have ever requested the Unblocking
+ -- operation or the Interrupt is currently Blocked.
function Is_Blocked (Interrupt : Interrupt_ID) return Boolean;
-- Comment needed ???
procedure Ignore_Interrupt (Interrupt : Interrupt_ID);
- -- Set the sigacion for the interrupt to SIG_IGN.
+ -- Set the sigaction for the interrupt to SIG_IGN
procedure Unignore_Interrupt (Interrupt : Interrupt_ID);
-- Comment needed ???
-- other low-level interface that changes the signal action or signal mask
-- needs a careful thought.
- -- One may acheive the effect of system calls first making RTS blocked
- -- (by calling Block_Interrupt) for the signal under consideration.
- -- This will make all the tasks in RTS blocked for the Interrupt.
+ -- One may achieve the effect of system calls first making RTS blocked (by
+ -- calling Block_Interrupt) for the signal under consideration. This will
+ -- make all the tasks in RTS blocked for the Interrupt.
----------------------
-- Protection Types --
-- There are two kinds of protected objects that deal with interrupts:
- -- (1) Only Interrupt_Handler pragmas are used. We need to be able to
- -- tell if an Interrupt_Handler applies to a given procedure, so
+ -- (1) Only Interrupt_Handler pragmas are used. We need to be able to tell
+ -- if an Interrupt_Handler applies to a given procedure, so
-- Register_Interrupt_Handler has to be called for all the potential
- -- handlers, it should be done by calling Register_Interrupt_Handler
- -- with the handler code address. On finalization, which can happen only
- -- has part of library level finalization since PO with
- -- Interrupt_Handler pragmas can only be declared at library level,
- -- nothing special needs to be done since the default handlers have been
- -- restored as part of task completion which is done just before global
- -- finalization. Dynamic_Interrupt_Protection should be used in this
- -- case.
+ -- handlers, it should be done by calling Register_Interrupt_Handler with
+ -- the handler code address. On finalization, which can happen only has
+ -- part of library level finalization since PO with Interrupt_Handler
+ -- pragmas can only be declared at library level, nothing special needs to
+ -- be done since the default handlers have been restored as part of task
+ -- completion which is done just before global finalization.
+ -- Dynamic_Interrupt_Protection should be used in this case.
-- (2) Attach_Handler pragmas are used, and possibly Interrupt_Handler
- -- pragma. We need to attach the handlers to the given interrupts when
- -- the objet is elaborated. This should be done by constructing an array
- -- of pairs (interrupt, handler) from the pragmas and calling
- -- Install_Handlers with it (types to be used are New_Handler_Item and
- -- New_Handler_Array). On finalization, we need to restore the handlers
- -- that were installed before the elaboration of the PO, so we need to
- -- store these previous handlers. This is also done by Install_Handlers,
- -- the room for these informations is provided by adding a discriminant
- -- which is the number of Attach_Handler pragmas and an array of this
- -- size in the protection type, Static_Interrupt_Protection.
+ -- pragma. We need to attach the handlers to the given interrupts when the
+ -- object is elaborated. This should be done by constructing an array of
+ -- pairs (interrupt, handler) from the pragmas and calling Install_Handlers
+ -- with it (types to be used are New_Handler_Item and New_Handler_Array).
+ -- On finalization, we need to restore the handlers that were installed
+ -- before the elaboration of the PO, so we need to store these previous
+ -- handlers. This is also done by Install_Handlers, the room for these
+ -- informations is provided by adding a discriminant which is the number
+ -- of Attach_Handler pragmas and an array of this size in the protection
+ -- type, Static_Interrupt_Protection.
procedure Register_Interrupt_Handler
(Handler_Addr : System.Address);
- -- This routine should be called by the compiler to allow the
- -- handler be used as an Interrupt Handler. That means call this
- -- procedure for each pragma Interrup_Handler providing the
- -- address of the handler (not including the pointer to the
- -- actual PO, this way this routine is called only once for
- -- each type definition of PO).
+ -- This routine should be called by the compiler to allow the handler be
+ -- used as an Interrupt Handler. That means call this procedure for each
+ -- pragma Interrupt_Handler providing the address of the handler (not
+ -- including the pointer to the actual PO, this way this routine is called
+ -- only once for each type definition of PO).
type Static_Handler_Index is range 0 .. Integer'Last;
subtype Positive_Static_Handler_Index is
Handler : Parameterless_Handler;
Static : Boolean;
end record;
- -- Contains all the information needed to restore a previous handler.
+ -- Contains all the information needed to restore a previous handler
type Previous_Handler_Array is array
(Positive_Static_Handler_Index range <>) of Previous_Handler_Item;
Interrupt : Interrupt_ID;
Handler : Parameterless_Handler;
end record;
- -- Contains all the information from an Attach_Handler pragma.
+ -- Contains all the information from an Attach_Handler pragma
type New_Handler_Array is
array (Positive_Static_Handler_Index range <>) of New_Handler_Item;
function Has_Interrupt_Or_Attach_Handler
(Object : access Dynamic_Interrupt_Protection) return Boolean;
- -- Returns True.
+ -- Returns True
-- Case (2)
end record;
function Has_Interrupt_Or_Attach_Handler
- (Object : access Static_Interrupt_Protection)
- return Boolean;
- -- Returns True.
+ (Object : access Static_Interrupt_Protection) return Boolean;
+ -- Returns True
procedure Finalize (Object : in out Static_Interrupt_Protection);
-- Restore previous handlers as required by C.3.1(12) then call
procedure Install_Handlers
(Object : access Static_Interrupt_Protection;
- New_Handlers : in New_Handler_Array);
+ New_Handlers : New_Handler_Array);
-- Store the old handlers in Object.Previous_Handlers and install
-- the new static handlers.
+ procedure Install_Restricted_Handlers (Handlers : New_Handler_Array);
+ -- Install the static Handlers for the given interrupts and do not store
+ -- previously installed handlers. This procedure is used when the Ravenscar
+ -- restrictions are in place since in that case there are only
+ -- library-level protected handlers that will be installed at
+ -- initialization and never be replaced.
+
end System.Interrupts;
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