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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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131
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9 -- Copyright (C) 1992-2018, 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 -- 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 -- This is the Solaris (native) version of this module
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43
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44 with System.OS_Interface;
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45
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46 package System.Task_Info is
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47 pragma Obsolescent (Task_Info, "use System.Multiprocessors and CPU aspect");
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48 pragma Preelaborate;
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49 pragma Elaborate_Body;
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50 -- To ensure that a body is allowed
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51
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52 -----------------------------------------------------
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53 -- Binding of Tasks to LWPs and LWPs to processors --
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54 -----------------------------------------------------
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55
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56 -- The Solaris implementation of the GNU Low-Level Interface (GNULLI)
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57 -- implements each Ada task as a Solaris thread. The Solaris thread
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58 -- library distributes threads across one or more LWPs (Light Weight
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59 -- Process) that are members of the same process. Solaris distributes
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60 -- processes and LWPs across the available CPUs on a given machine. The
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61 -- pragma Task_Info provides the mechanism to control the distribution
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62 -- of tasks to LWPs, and LWPs to processors.
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63
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64 -- Each thread has a number of attributes that dictate it's scheduling.
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65 -- These attributes are:
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66 --
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67 -- New_LWP: whether a new LWP is created for this thread.
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68 --
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69 -- Bound_To_LWP: whether the thread is bound to a specific LWP
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70 -- for its entire lifetime.
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71 --
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72 -- CPU: the CPU number associated to the LWP
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73 --
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74
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75 -- The Task_Info pragma:
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76
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77 -- pragma Task_Info (EXPRESSION);
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78
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79 -- allows the specification on a task by task basis of a value of type
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80 -- System.Task_Info.Task_Info_Type to be passed to a task when it is
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81 -- created. The specification of this type, and the effect on the task
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82 -- that is created is target dependent.
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83
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84 -- The Task_Info pragma appears within a task definition (compare the
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85 -- definition and implementation of pragma Priority). If no such pragma
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86 -- appears, then the value Unspecified_Task_Info is passed. If a pragma
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87 -- is present, then it supplies an alternative value. If the argument of
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88 -- the pragma is a discriminant reference, then the value can be set on
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89 -- a task by task basis by supplying the appropriate discriminant value.
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90
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91 -- Note that this means that the type used for Task_Info_Type must be
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92 -- suitable for use as a discriminant (i.e. a scalar or access type).
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93
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94 -----------------------
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95 -- Thread Attributes --
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96 -----------------------
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97
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98 subtype CPU_Number is System.OS_Interface.processorid_t;
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99
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100 CPU_UNCHANGED : constant CPU_Number := System.OS_Interface.PBIND_QUERY;
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101 -- Do not bind the LWP to a specific processor
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102
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103 ANY_CPU : constant CPU_Number := System.OS_Interface.PBIND_NONE;
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104 -- Bind the LWP to any processor
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105
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106 Invalid_CPU_Number : exception;
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107
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108 type Thread_Attributes (New_LWP : Boolean) is record
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109 Bound_To_LWP : Boolean := True;
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110 case New_LWP is
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111 when False =>
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112 null;
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113 when True =>
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114 CPU : CPU_Number := CPU_UNCHANGED;
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115 end case;
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116 end record;
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117
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118 Default_Thread_Attributes : constant Thread_Attributes := (False, True);
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119
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120 function Unbound_Thread_Attributes
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121 return Thread_Attributes;
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122
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123 function Bound_Thread_Attributes
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124 return Thread_Attributes;
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125
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126 function Bound_Thread_Attributes (CPU : CPU_Number)
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127 return Thread_Attributes;
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128
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129 type Task_Info_Type is access all Thread_Attributes;
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130
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131 function New_Unbound_Thread_Attributes
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132 return Task_Info_Type;
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133
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134 function New_Bound_Thread_Attributes
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135 return Task_Info_Type;
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136
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137 function New_Bound_Thread_Attributes (CPU : CPU_Number)
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138 return Task_Info_Type;
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139
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140 Unspecified_Task_Info : constant Task_Info_Type := null;
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141
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142 end System.Task_Info;
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