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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-intman.ads')
-rw-r--r-- | gcc-4.2.1/gcc/ada/s-intman.ads | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-intman.ads b/gcc-4.2.1/gcc/ada/s-intman.ads new file mode 100644 index 000000000..a7909c91c --- /dev/null +++ b/gcc-4.2.1/gcc/ada/s-intman.ads @@ -0,0 +1,108 @@ +------------------------------------------------------------------------------ +-- -- +-- 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 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; + + -- 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_Interrupt : Interrupt_ID; + -- The interrupt that is used to implement task abort if an interrupt is + -- used for that purpose. This is one of the reserved interrupts. + + Keep_Unmasked : Interrupt_Set := (others => False); + -- Keep_Unmasked (I) is true iff the interrupt I is one that must that + -- must be kept unmasked at all times, except (perhaps) for short critical + -- sections. This includes interrupts that are mapped to exceptions (see + -- System.Interrupt_Exceptions.Is_Exception), but may also include + -- interrupts (e.g. timer) that need to be kept unmasked for other + -- reasons. Where interrupts are implemented as OS signals, and signal + -- masking is per-task, the interrupt 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; + -- 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 implementations Interrupt_Mask can be represented as a linked + -- list. + +end System.Interrupt_Management; |