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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 . T A S K I N G . T A S K _ A T T R I B U T E S --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 2014-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT 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 with System.Parameters; use System.Parameters;
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33 with System.Tasking.Initialization; use System.Tasking.Initialization;
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34 with System.Task_Primitives.Operations;
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35
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36 package body System.Tasking.Task_Attributes is
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37
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38 package STPO renames System.Task_Primitives.Operations;
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39
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40 type Index_Info is record
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41 Used : Boolean;
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42 -- Used is True if a given index is used by an instantiation of
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43 -- Ada.Task_Attributes, False otherwise.
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44
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45 Require_Finalization : Boolean;
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46 -- Require_Finalization is True if the attribute requires finalization
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47 end record;
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48
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49 Index_Array : array (1 .. Max_Attribute_Count) of Index_Info :=
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50 (others => (False, False));
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51
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52 -- Note that this package will use an efficient implementation with no
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53 -- locks and no extra dynamic memory allocation if Attribute can fit in a
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54 -- System.Address type and Initial_Value is 0 (or null for an access type).
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55
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56 function Next_Index (Require_Finalization : Boolean) return Integer is
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57 Self_Id : constant Task_Id := STPO.Self;
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58
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59 begin
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60 Task_Lock (Self_Id);
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61
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62 for J in Index_Array'Range loop
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63 if not Index_Array (J).Used then
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64 Index_Array (J).Used := True;
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65 Index_Array (J).Require_Finalization := Require_Finalization;
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66 Task_Unlock (Self_Id);
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67 return J;
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68 end if;
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69 end loop;
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70
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71 Task_Unlock (Self_Id);
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72 raise Storage_Error with "Out of task attributes";
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73 end Next_Index;
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74
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75 --------------
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76 -- Finalize --
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77 --------------
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78
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79 procedure Finalize (Index : Integer) is
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80 Self_Id : constant Task_Id := STPO.Self;
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81 begin
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82 pragma Assert (Index in Index_Array'Range);
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83 Task_Lock (Self_Id);
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84 Index_Array (Index).Used := False;
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85 Task_Unlock (Self_Id);
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86 end Finalize;
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87
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88 --------------------------
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89 -- Require_Finalization --
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90 --------------------------
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91
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92 function Require_Finalization (Index : Integer) return Boolean is
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93 begin
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94 pragma Assert (Index in Index_Array'Range);
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95 return Index_Array (Index).Require_Finalization;
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96 end Require_Finalization;
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97
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98 end System.Tasking.Task_Attributes;
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