gcc/ada/5qosinte.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                   S Y S T E M . O S _ I N T E R F A C E                  --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --             Copyright (C) 1991-2001 Florida State University             --
  10 --                                                                          --
  11 -- GNARL 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. GNARL 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 GNARL; 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 -- GNARL was developed by the GNARL team at Florida State University. It is --
  30 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  31 -- State University (http://www.gnat.com).                                  --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  RT GNU/Linux version.
  36
  37 --  This package encapsulates all direct interfaces to OS services
  38 --  that are needed by children of System.
  39
  40 --  PLEASE DO NOT add any with-clauses to this package
  41 --  or remove the pragma Elaborate_Body.
  42 --  It is designed to be a bottom-level (leaf) package.
  43
  44 with Interfaces.C;
  45
  46 package System.OS_Interface is
  47
  48    pragma Preelaborate;
  49
  50    subtype int            is Interfaces.C.int;
  51    subtype unsigned_long  is Interfaces.C.unsigned_long;
  52
  53    --  RT GNU/Linux kernel threads should not use the
  54    --  OS signal interfaces.
  55
  56    Max_Interrupt : constant := 2;
  57    type Signal is new int range 0 .. Max_Interrupt;
  58    type sigset_t is new Integer;
  59
  60    ----------
  61    -- Time --
  62    ----------
  63
  64    RT_TICKS_PER_SEC : constant := 1193180;
  65    --  the amount of time units in one second.
  66
  67    RT_TIME_END : constant := 16#7fffFfffFfffFfff#;
  68
  69    type RTIME is range -2 ** 63 .. 2 ** 63 - 1;
  70    --  the introduction of type RTIME is due to the fact that RT-GNU/Linux
  71    --  uses this type to represent time. In RT-GNU/Linux, it's a long long
  72    --  integer that takes 64 bits for storage
  73
  74    -------------------------
  75    -- Priority Scheduling --
  76    -------------------------
  77
  78    RT_LOWEST_PRIORITY : constant System.Any_Priority :=
  79      System.Any_Priority'First;
  80    --  for the lowest priority task in RT-GNU/Linux. By the design, this
  81    --  task is the regular GNU/Linux kernel.
  82
  83    RT_TASK_MAGIC : constant := 16#754d2774#;
  84    --  a special constant used as a label for a task that has been created
  85
  86    ----------------------------
  87    -- RT constants and types --
  88    ----------------------------
  89
  90    SFIF : Integer;
  91    pragma Import (C, SFIF, "SFIF");
  92    --  Interrupt emulation flag used by RT-GNU/Linux. If it's 0, the regular
  93    --  GNU/Linux kernel is preempted. Otherwise, the regular Linux kernel is
  94    --  running
  95
  96    GFP_ATOMIC : constant := 16#1#;
  97    GFP_KERNEL : constant := 16#3#;
  98    --  constants to indicate the priority of a call to kmalloc.
  99    --  GFP_KERNEL is used in the current implementation to allocate
 100    --  stack space for a task. Since GFP_ATOMIC has higher priority,
 101    --  if necessary, replace GFP_KERNEL with GFP_ATOMIC
 102
 103    type Rt_Task_States is (RT_TASK_READY, RT_TASK_DELAYED, RT_TASK_DORMANT);
 104
 105    -------------
 106    -- Threads --
 107    -------------
 108
 109    type Thread_Body is access
 110      function (arg : System.Address) return System.Address;
 111
 112    --  ??? need to define a type for references to (IDs of)
 113    --  RT GNU/Linux lock objects, and implement the lock objects.
 114
 115    subtype Thread_Id is System.Address;
 116
 117    -------------------------------
 118    -- Useful imported functions --
 119    -------------------------------
 120
 121    -------------------------------------
 122    -- Functions from GNU/Linux kernel --
 123    -------------------------------------
 124
 125    function Kmalloc (size : Integer; Priority : Integer) return System.Address;
 126    pragma Import (C, Kmalloc, "kmalloc");
 127
 128    procedure Kfree (Ptr : System.Address);
 129    pragma Import (C, Kfree, "kfree");
 130
 131    procedure Printk (Msg : String);
 132    pragma Import (C, Printk, "printk");
 133
 134    ---------------------
 135    -- RT time related --
 136    ---------------------
 137
 138    function Rt_Get_Time return RTIME;
 139    pragma Import (C, Rt_Get_Time, "rt_get_time");
 140
 141    function Rt_Request_Timer (Fn : System.Address) return Integer;
 142    procedure Rt_Request_Timer (Fn : System.Address);
 143    pragma Import (C, Rt_Request_Timer, "rt_request_timer");
 144
 145    procedure Rt_Free_Timer;
 146    pragma Import (C, Rt_Free_Timer, "rt_free_timer");
 147
 148    procedure Rt_Set_Timer (T : RTIME);
 149    pragma Import (C, Rt_Set_Timer, "rt_set_timer");
 150
 151    procedure Rt_No_Timer;
 152    pragma Import (C, Rt_No_Timer, "rt_no_timer");
 153
 154    ---------------------
 155    -- RT FIFO related --
 156    ---------------------
 157
 158    function Rtf_Create (Fifo : Integer; Size : Integer) return Integer;
 159    pragma Import (C, Rtf_Create, "rtf_create");
 160
 161    function Rtf_Destroy (Fifo : Integer) return Integer;
 162    pragma Import (C, Rtf_Destroy, "rtf_destroy");
 163
 164    function Rtf_Resize (Minor : Integer; Size : Integer) return Integer;
 165    pragma Import (C, Rtf_Resize, "rtf_resize");
 166
 167    function Rtf_Put
 168      (Fifo  : Integer;
 169       Buf   : System.Address;
 170       Count : Integer) return Integer;
 171    pragma Import (C, Rtf_Put, "rtf_put");
 172
 173    function Rtf_Get
 174      (Fifo  : Integer;
 175       Buf   : System.Address;
 176       Count : Integer) return Integer;
 177    pragma Import (C, Rtf_Get, "rtf_get");
 178
 179    function Rtf_Create_Handler
 180      (Fifo    : Integer;
 181       Handler : System.Address) return Integer;
 182    pragma Import (C, Rtf_Create_Handler, "rtf_create_handler");
 183
 184 private
 185    type Require_Body;
 186 end System.OS_Interface;