------------------------------------------------------------------------------
--                                                                          --
--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
--                                                                          --
--                         A D A . I N T E R R U P T S                      --
--                                                                          --
--                                  B o d y                                 --
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--                             $Revision: 1.11 $                            --
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--          Copyright (C) 1991-1996, 1998 Florida State University          --
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-- GNARL is free software; you can  redistribute it  and/or modify it under --
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-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
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-- 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 --
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--                                                                          --
------------------------------------------------------------------------------

with System.Interrupts;
--  used for Interrupt_ID
--           Parameterless_Handler
--           Is_Reserved
--           Is_Handler_Attached
--           Current_Handler
--           Attach_Handler
--           Exchange_Handler
--           Detach_Handler
--           Reference

with Unchecked_Conversion;

package body Ada.Interrupts is

   package SI renames System.Interrupts;

   function To_System is new Unchecked_Conversion
     (Parameterless_Handler, SI.Parameterless_Handler);
   function To_Ada is new Unchecked_Conversion
     (SI.Parameterless_Handler, Parameterless_Handler);

   -----------------
   -- Is_Reserved --
   -----------------

   function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
   begin
      return SI.Is_Reserved (SI.Interrupt_ID (Interrupt));
   end Is_Reserved;

   -----------------
   -- Is_Attached --
   -----------------

   function Is_Attached (Interrupt : Interrupt_ID) return Boolean is
   begin
      return SI.Is_Handler_Attached (SI.Interrupt_ID (Interrupt));
   end Is_Attached;

   ---------------------
   -- Current_Handler --
   ---------------------

   function Current_Handler (Interrupt : Interrupt_ID)
     return Parameterless_Handler is
   begin
      return To_Ada (SI.Current_Handler (SI.Interrupt_ID (Interrupt)));
   end Current_Handler;

   --------------------
   -- Attach_Handler --
   --------------------

   procedure Attach_Handler
     (New_Handler : in Parameterless_Handler;
      Interrupt   : in Interrupt_ID) is
   begin
      SI.Attach_Handler
        (To_System (New_Handler), SI.Interrupt_ID (Interrupt), False);
   end Attach_Handler;

   ----------------------
   -- Exchange_Handler --
   ----------------------

   procedure Exchange_Handler
     (Old_Handler : out Parameterless_Handler;
      New_Handler : in Parameterless_Handler;
      Interrupt   : in Interrupt_ID)
   is
      H : SI.Parameterless_Handler;
   begin
      SI.Exchange_Handler
        (H, To_System (New_Handler),
         SI.Interrupt_ID (Interrupt), False);
      Old_Handler := To_Ada (H);
   end Exchange_Handler;

   --------------------
   -- Detach_Handler --
   --------------------

   procedure Detach_Handler (Interrupt : in Interrupt_ID) is
   begin
      SI.Detach_Handler (SI.Interrupt_ID (Interrupt), False);
   end Detach_Handler;

   ---------------
   -- Reference --
   ---------------

   function Reference (Interrupt : Interrupt_ID) return System.Address is
   begin
      return SI.Reference (SI.Interrupt_ID (Interrupt));
   end Reference;

end Ada.Interrupts;
