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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- 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 --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package encapsulates and centralizes information about all uses of
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33 -- interrupts (or signals), including the target-dependent mapping of
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34 -- interrupts (or signals) to exceptions.
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35
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36 -- Unlike the original design, System.Interrupt_Management can only be used
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37 -- for tasking systems.
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38
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39 -- PLEASE DO NOT put any subprogram declarations with arguments of type
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40 -- Interrupt_ID into the visible part of this package. The type Interrupt_ID
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41 -- is used to derive the type in Ada.Interrupts, and adding more operations
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42 -- to that type would be illegal according to the Ada Reference Manual. This
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43 -- is the reason why the signals sets are implemented using visible arrays
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44 -- rather than functions.
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45
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46 with System.OS_Interface;
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47
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48 with Interfaces.C;
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49
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50 package System.Interrupt_Management is
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51 pragma Preelaborate;
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52
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53 type Interrupt_Mask is limited private;
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54
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55 type Interrupt_ID is new Interfaces.C.int
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56 range 0 .. System.OS_Interface.Max_Interrupt;
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57
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58 type Interrupt_Set is array (Interrupt_ID) of Boolean;
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59
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60 -- The following objects serve as constants, but are initialized in the
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61 -- body to aid portability. This permits us to use more portable names for
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62 -- interrupts, where distinct names may map to the same interrupt ID
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63 -- value.
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64
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65 -- For example, suppose SIGRARE is a signal that is not defined on all
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66 -- systems, but is always reserved when it is defined. If we have the
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67 -- convention that ID zero is not used for any "real" signals, and SIGRARE
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68 -- = 0 when SIGRARE is not one of the locally supported signals, we can
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69 -- write:
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70 -- Reserved (SIGRARE) := True;
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71 -- and the initialization code will be portable.
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72
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73 Abort_Task_Interrupt : Interrupt_ID;
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74 -- The interrupt that is used to implement task abort if an interrupt is
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75 -- used for that purpose. This is one of the reserved interrupts.
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76
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77 Keep_Unmasked : Interrupt_Set := (others => False);
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78 -- Keep_Unmasked (I) is true iff the interrupt I is one that must be kept
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79 -- unmasked at all times, except (perhaps) for short critical sections.
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80 -- This includes interrupts that are mapped to exceptions (see
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81 -- System.Interrupt_Exceptions.Is_Exception), but may also include
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82 -- interrupts (e.g. timer) that need to be kept unmasked for other
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83 -- reasons. Where interrupts are implemented as OS signals, and signal
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84 -- masking is per-task, the interrupt should be unmasked in ALL TASKS.
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85
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86 Reserve : Interrupt_Set := (others => False);
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87 -- Reserve (I) is true iff the interrupt I is one that cannot be permitted
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88 -- to be attached to a user handler. The possible reasons are many. For
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89 -- example, it may be mapped to an exception used to implement task abort,
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90 -- or used to implement time delays.
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91
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92 procedure Initialize;
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93 -- Initialize the various variables defined in this package. This procedure
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94 -- must be called before accessing any object from this package, and can be
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95 -- called multiple times.
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96
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97 private
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98 type Interrupt_Mask is new System.OS_Interface.sigset_t;
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99 -- In some implementations Interrupt_Mask is represented as a linked list
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100
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101 procedure Adjust_Context_For_Raise
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102 (Signo : System.OS_Interface.Signal;
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103 Ucontext : System.Address);
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104 pragma Import
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105 (C, Adjust_Context_For_Raise, "__gnat_adjust_context_for_raise");
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106 -- Target specific hook performing adjustments to the signal's machine
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107 -- context, to be called before an exception may be raised from a signal
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108 -- handler. This service is provided by init.c, together with the
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109 -- non-tasking signal handler.
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110
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111 end System.Interrupt_Management;
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