gcc/ada/7stpopsp.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --    S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S .   --
   6 --                              S P E C I F I C                             --
   7 --                                                                          --
   8 --                                  B o d y                                 --
   9 --                                                                          --
  10 --                             $Revision: 1.1 $
  11 --                                                                          --
  12 --            Copyright (C) 1991-1998, Florida State University             --
  13 --                                                                          --
  14 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  15 -- terms of the  GNU General Public License as published  by the Free Soft- --
  16 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  17 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  18 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  19 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  20 -- for  more details.  You should have  received  a copy of the GNU General --
  21 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  22 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  23 -- MA 02111-1307, USA.                                                      --
  24 --                                                                          --
  25 -- As a special exception,  if other files  instantiate  generics from this --
  26 -- unit, or you link  this unit with other files  to produce an executable, --
  27 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  28 -- covered  by the  GNU  General  Public  License.  This exception does not --
  29 -- however invalidate  any other reasons why  the executable file  might be --
  30 -- covered by the  GNU Public License.                                      --
  31 --                                                                          --
  32 -- GNARL was developed by the GNARL team at Florida State University. It is --
  33 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  34 -- State University (http://www.gnat.com).                                  --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 --  This is a FSU-like version of this package.
  39
  40 separate (System.Task_Primitives.Operations)
  41 package body Specific is
  42
  43    ------------------
  44    --  Local Data  --
  45    ------------------
  46
  47    --  The followings are logically constants, but need to be initialized
  48    --  at run time.
  49
  50    ATCB_Key : aliased pthread_key_t;
  51    --  Key used to find the Ada Task_ID associated with a thread
  52
  53    ----------------
  54    -- Initialize --
  55    ----------------
  56
  57    procedure Initialize (Environment_Task : Task_ID) is
  58       Result : Interfaces.C.int;
  59    begin
  60       Result := pthread_key_create (ATCB_Key'Access, null);
  61       pragma Assert (Result = 0);
  62       Result := pthread_setspecific (ATCB_Key, To_Address (Environment_Task));
  63       pragma Assert (Result = 0);
  64    end Initialize;
  65
  66    ---------
  67    -- Set --
  68    ---------
  69
  70    procedure Set (Self_Id : Task_ID) is
  71       Result  : Interfaces.C.int;
  72
  73    begin
  74       Result := pthread_setspecific (ATCB_Key, To_Address (Self_Id));
  75       pragma Assert (Result = 0);
  76    end Set;
  77
  78    ----------
  79    -- Self --
  80    ----------
  81
  82    function Self return Task_ID is
  83       Result : System.Address;
  84
  85    begin
  86       Result := pthread_getspecific (ATCB_Key);
  87       pragma Assert (Result /= System.Null_Address);
  88       return To_Task_ID (Result);
  89    end Self;
  90
  91 end Specific;