------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2005 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 is the VxWorks version of this package -- This package encapsulates and centralizes information about all -- uses of interrupts (or signals), including the target-dependent -- mapping of interrupts (or signals) to exceptions. -- Unlike the original design, System.Interrupt_Management can only -- be used for tasking systems. -- PLEASE DO NOT put any subprogram declarations with arguments of -- type Interrupt_ID into the visible part of this package. The type -- Interrupt_ID is used to derive the type in Ada.Interrupts, and -- adding more operations to that type would be illegal according -- to the Ada Reference Manual. This is the reason why the signals -- sets are implemeneted using visible arrays rather than functions. with System.OS_Interface; -- used for sigset_t with Interfaces.C; -- used for int package System.Interrupt_Management is pragma Preelaborate; type Interrupt_Mask is limited private; type Interrupt_ID is new Interfaces.C.int range 0 .. System.OS_Interface.Max_Interrupt; type Interrupt_Set is array (Interrupt_ID) of Boolean; subtype Signal_ID is Interrupt_ID range 0 .. Interfaces.C."-" (System.OS_Interface.NSIG, 1); type Signal_Set is array (Signal_ID) of Boolean; -- The following objects serve as constants, but are initialized in the -- body to aid portability. This permits us to use more portable names for -- interrupts, where distinct names may map to the same interrupt ID -- value. -- For example, suppose SIGRARE is a signal that is not defined on all -- systems, but is always reserved when it is defined. If we have the -- convention that ID zero is not used for any "real" signals, and SIGRARE -- = 0 when SIGRARE is not one of the locally supported signals, we can -- write: -- Reserved (SIGRARE) := true; -- and the initialization code will be portable. Abort_Task_Signal : Signal_ID; -- The signal that is used to implement task abort if an interrupt is used -- for that purpose. This is one of the reserved signals. Keep_Unmasked : Signal_Set := (others => False); -- Keep_Unmasked (I) is true iff the signal I is one that must that must -- be kept unmasked at all times, except (perhaps) for short critical -- sections. This includes signals that are mapped to exceptions, but may -- also include interrupts (e.g. timer) that need to be kept unmasked for -- other reasons. Where signal masking is per-task, the signal should be -- unmasked in ALL TASKS. Reserve : Interrupt_Set := (others => False); -- Reserve (I) is true iff the interrupt I is one that cannot be permitted -- to be attached to a user handler. The possible reasons are many. For -- example, it may be mapped to an exception used to implement task abort, -- or used to implement time delays. procedure Initialize_Interrupts; -- Under VxWorks, there is no signal inheritance between tasks. -- This procedure is used to initialize signal-to-exception mapping in -- each task. procedure Initialize; -- Initialize the various variables defined in this package. -- This procedure must be called before accessing any object from this -- package and can be called multiple times. private type Interrupt_Mask is new System.OS_Interface.sigset_t; -- In some implementation Interrupt_Mask can be represented as a linked -- list. end System.Interrupt_Management;