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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- S Y S T E M . T A S K _ I N F O --
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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 -- 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 -- GNAT was originally developed by the GNAT team at New York 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 contains the definitions and routines associated with the
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33 -- implementation and use of the Task_Info pragma. It is specialized
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34 -- appropriately for targets that make use of this pragma.
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35
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36 -- Note: the compiler generates direct calls to this interface, via Rtsfind.
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37 -- Any changes to this interface may require corresponding compiler changes.
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38
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39 -- The functionality in this unit is now provided by the predefined package
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40 -- System.Multiprocessors and the CPU aspect. This package is obsolescent.
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41
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42 package System.Task_Info is
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43 pragma Obsolescent (Task_Info, "use System.Multiprocessors and CPU aspect");
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44 pragma Preelaborate;
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45 pragma Elaborate_Body;
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46 -- To ensure that a body is allowed
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47
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48 -----------------------------------------
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49 -- Implementation of Task_Info Feature --
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50 -----------------------------------------
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51
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52 -- The Task_Info pragma:
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53
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54 -- pragma Task_Info (EXPRESSION);
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55
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56 -- allows the specification on a task by task basis of a value of type
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57 -- System.Task_Info.Task_Info_Type to be passed to a task when it is
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58 -- created. The specification of this type, and the effect on the task
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59 -- that is created is target dependent.
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60
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61 -- The Task_Info pragma appears within a task definition (compare the
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62 -- definition and implementation of pragma Priority). If no such pragma
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63 -- appears, then the value Unspecified_Task_Info is passed. If a pragma
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64 -- is present, then it supplies an alternative value. If the argument of
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65 -- the pragma is a discriminant reference, then the value can be set on
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66 -- a task by task basis by supplying the appropriate discriminant value.
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67
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68 -- Note that this means that the type used for Task_Info_Type must be
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69 -- suitable for use as a discriminant (i.e. a scalar or access type).
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70
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71 ------------------
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72 -- Declarations --
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73 ------------------
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74
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75 type Scope_Type is
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76 (Process_Scope,
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77 -- Contend only with threads in same process
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78
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79 System_Scope,
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80 -- Contend with all threads on same CPU
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81
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82 Default_Scope);
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83
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84 type Task_Info_Type is new Scope_Type;
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85 -- Type used for passing information to task create call, using the
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86 -- Task_Info pragma. This type may be specialized for individual
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87 -- implementations, but it must be a type that can be used as a
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88 -- discriminant (i.e. a scalar or access type).
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89
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90 Unspecified_Task_Info : constant Task_Info_Type := Default_Scope;
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91 -- Value passed to task in the absence of a Task_Info pragma
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92
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93 end System.Task_Info;
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