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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                     S Y S T E M . T A S K _ I N F O                      --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package contains the definitions and routines associated with the
  33 --  implementation and use of the Task_Info pragma. It is specialized
  34 --  appropriately for targets that make use of this pragma.
  35
  36 --  Note: the compiler generates direct calls to this interface, via Rtsfind.
  37 --  Any changes to this interface may require corresponding compiler changes.
  38
  39 --  This unit may be used directly from an application program by providing
  40 --  an appropriate WITH, and the interface can be expected to remain stable.
  41
  42 --  This is the IRIX (kernel threads) version of this package
  43
  44 with Interfaces.C;
  45
  46 package System.Task_Info is
  47    pragma Preelaborate;
  48    pragma Elaborate_Body;
  49    --  To ensure that a body is allowed
  50
  51    -----------------------------------------
  52    -- Implementation of Task_Info Feature --
  53    -----------------------------------------
  54
  55    --  Pragma Task_Info allows an application to set the underlying
  56    --  pthread scheduling attributes for a specific task.
  57
  58    ------------------
  59    -- Declarations --
  60    ------------------
  61
  62    type Thread_Scheduling_Scope is
  63      (PTHREAD_SCOPE_PROCESS, PTHREAD_SCOPE_SYSTEM);
  64
  65    for Thread_Scheduling_Scope'Size use Interfaces.C.int'Size;
  66
  67    type Thread_Scheduling_Inheritance is
  68       (PTHREAD_EXPLICIT_SCHED, PTHREAD_INHERIT_SCHED);
  69
  70    for Thread_Scheduling_Inheritance'Size use Interfaces.C.int'Size;
  71
  72    type Thread_Scheduling_Policy is
  73       (SCHED_FIFO,   --  The first-in-first-out real-time policy
  74        SCHED_RR,     --  The round-robin real-time scheduling policy
  75        SCHED_TS);    --  The timeshare earnings based scheduling policy
  76
  77    for Thread_Scheduling_Policy'Size use Interfaces.C.int'Size;
  78    for Thread_Scheduling_Policy use
  79       (SCHED_FIFO => 1,
  80        SCHED_RR   => 2,
  81        SCHED_TS   => 3);
  82
  83    function SCHED_OTHER return Thread_Scheduling_Policy renames SCHED_TS;
  84
  85    No_Specified_Priority : constant := -1;
  86
  87    subtype Thread_Scheduling_Priority is Integer range
  88      No_Specified_Priority .. 255;
  89
  90    subtype FIFO_Priority is Thread_Scheduling_Priority range 0 .. 255;
  91
  92    subtype RR_Priority is Thread_Scheduling_Priority range 0 .. 255;
  93
  94    subtype TS_Priority is Thread_Scheduling_Priority range 1 .. 40;
  95
  96    subtype OTHER_Priority is Thread_Scheduling_Priority range 1 .. 40;
  97
  98    subtype CPU_Number is Integer range -1 .. Integer'Last;
  99    ANY_CPU : constant CPU_Number := CPU_Number'First;
 100
 101    type Thread_Attributes is record
 102       Scope       : Thread_Scheduling_Scope       := PTHREAD_SCOPE_PROCESS;
 103       Inheritance : Thread_Scheduling_Inheritance := PTHREAD_EXPLICIT_SCHED;
 104       Policy      : Thread_Scheduling_Policy      := SCHED_RR;
 105       Priority    : Thread_Scheduling_Priority    := No_Specified_Priority;
 106       Runon_CPU   : CPU_Number                    := ANY_CPU;
 107    end record;
 108
 109    Default_Thread_Attributes : constant Thread_Attributes :=
 110      (PTHREAD_SCOPE_PROCESS, PTHREAD_EXPLICIT_SCHED, SCHED_RR,
 111        No_Specified_Priority, ANY_CPU);
 112
 113    type Task_Info_Type is access all Thread_Attributes;
 114
 115    Unspecified_Task_Info : constant Task_Info_Type := null;
 116    --  Value passed to task in the absence of a Task_Info pragma
 117
 118 end System.Task_Info;