gcc/ada/5ftasinf.ads

   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) 1992-2003 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package contains the definitions and routines associated with the
  35 --  implementation and use of the Task_Info pragma. It is specialized
  36 --  appropriately for targets that make use of this pragma.
  37
  38 --  Note: the compiler generates direct calls to this interface, via Rtsfind.
  39 --  Any changes to this interface may require corresponding compiler changes.
  40
  41 --  This unit may be used directly from an application program by providing
  42 --  an appropriate WITH, and the interface can be expected to remain stable.
  43
  44 --  This is the IRIX (kernel threads) version of this package
  45
  46 with Interfaces.C;
  47 with System.OS_Interface;
  48
  49 package System.Task_Info is
  50    pragma Elaborate_Body;
  51    --  To ensure that a body is allowed
  52
  53    package OSI renames System.OS_Interface;
  54
  55    -----------------------------------------
  56    -- Implementation of Task_Info Feature --
  57    -----------------------------------------
  58
  59    --  Pragma Task_Info allows an application to set the underlying
  60    --  pthread scheduling attributes for a specific task.
  61
  62    ------------------
  63    -- Declarations --
  64    ------------------
  65
  66    type Thread_Scheduling_Scope is
  67      (PTHREAD_SCOPE_PROCESS, PTHREAD_SCOPE_SYSTEM);
  68
  69    for Thread_Scheduling_Scope'Size use Interfaces.C.int'Size;
  70
  71    type Thread_Scheduling_Inheritance is
  72       (PTHREAD_EXPLICIT_SCHED, PTHREAD_INHERIT_SCHED);
  73
  74    for Thread_Scheduling_Inheritance'Size use Interfaces.C.int'Size;
  75
  76    type Thread_Scheduling_Policy is
  77       (SCHED_FIFO,   --  The first-in-first-out real-time policy
  78        SCHED_RR,     --  The round-robin real-time scheduling policy
  79        SCHED_TS);    --  The timeshare earnings based scheduling policy
  80
  81    for Thread_Scheduling_Policy'Size use Interfaces.C.int'Size;
  82    for Thread_Scheduling_Policy use
  83       (SCHED_FIFO => 1,
  84        SCHED_RR   => 2,
  85        SCHED_TS   => 3);
  86
  87    function SCHED_OTHER return Thread_Scheduling_Policy renames SCHED_TS;
  88
  89    No_Specified_Priority : constant := -1;
  90
  91    subtype Thread_Scheduling_Priority is Integer range
  92      No_Specified_Priority .. 255;
  93
  94    function Min (Policy : Interfaces.C.int) return Interfaces.C.int
  95      renames OSI.sched_get_priority_min;
  96
  97    function Max (Policy : Interfaces.C.int) return Interfaces.C.int
  98      renames OSI.sched_get_priority_max;
  99
 100    subtype FIFO_Priority is Thread_Scheduling_Priority range
 101       Thread_Scheduling_Priority (Min (OSI.SCHED_FIFO)) ..
 102       Thread_Scheduling_Priority (Max (OSI.SCHED_FIFO));
 103
 104    subtype RR_Priority is Thread_Scheduling_Priority range
 105       Thread_Scheduling_Priority (Min (OSI.SCHED_RR)) ..
 106       Thread_Scheduling_Priority (Max (OSI.SCHED_RR));
 107
 108    subtype TS_Priority is Thread_Scheduling_Priority range
 109       Thread_Scheduling_Priority (Min (OSI.SCHED_TS)) ..
 110       Thread_Scheduling_Priority (Max (OSI.SCHED_TS));
 111
 112    subtype OTHER_Priority is Thread_Scheduling_Priority range
 113       Thread_Scheduling_Priority (Min (OSI.SCHED_OTHER)) ..
 114       Thread_Scheduling_Priority (Max (OSI.SCHED_OTHER));
 115
 116    subtype CPU_Number is Integer range -1 .. Integer'Last;
 117    ANY_CPU : constant CPU_Number := CPU_Number'First;
 118
 119    type Thread_Attributes is record
 120       Scope       : Thread_Scheduling_Scope       := PTHREAD_SCOPE_PROCESS;
 121       Inheritance : Thread_Scheduling_Inheritance := PTHREAD_EXPLICIT_SCHED;
 122       Policy      : Thread_Scheduling_Policy      := SCHED_RR;
 123       Priority    : Thread_Scheduling_Priority    := No_Specified_Priority;
 124       Runon_CPU   : CPU_Number                    := ANY_CPU;
 125    end record;
 126
 127    Default_Thread_Attributes : constant Thread_Attributes :=
 128      (PTHREAD_SCOPE_PROCESS, PTHREAD_EXPLICIT_SCHED, SCHED_RR,
 129        No_Specified_Priority, ANY_CPU);
 130
 131    type Task_Info_Type is access all Thread_Attributes;
 132
 133    Unspecified_Task_Info : constant Task_Info_Type := null;
 134    --  Value passed to task in the absence of a Task_Info pragma
 135
 136 end System.Task_Info;