gcc/ada/5vtpopde.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 --                                 . D E C                                  --
   7 --                                                                          --
   8 --                                  B o d y                                 --
   9 --                                                                          --
  10 --                             $Revision: 1.1 $                             --
  11 --                                                                          --
  12 --              Copyright (C) 2000 Free Software Foundation, Inc.           --
  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 --   This package is for OpenVMS/Alpha
  38 --
  39 with System.OS_Interface;
  40 with System.Tasking;
  41 with Unchecked_Conversion;
  42 package body System.Task_Primitives.Operations.DEC is
  43
  44    use System.OS_Interface;
  45    use System.Tasking;
  46    use System.Aux_DEC;
  47    use type Interfaces.C.int;
  48
  49    --  The FAB_RAB_Type specifieds where the context field (the calling
  50    --  task) is stored.  Other fields defined for FAB_RAB arent' need and
  51    --  so are ignored.
  52    type FAB_RAB_Type is
  53    record
  54       CTX : Unsigned_Longword;
  55    end record;
  56
  57    for FAB_RAB_Type use
  58    record
  59       CTX at 24 range 0 .. 31;
  60    end record;
  61
  62    for FAB_RAB_Type'Size use 224;
  63
  64    type FAB_RAB_Access_Type is access all FAB_RAB_Type;
  65
  66    -----------------------
  67    -- Local Subprograms --
  68    -----------------------
  69
  70    function To_Unsigned_Longword is new
  71      Unchecked_Conversion (Task_ID, Unsigned_Longword);
  72
  73    function To_Task_Id is new
  74      Unchecked_Conversion (Unsigned_Longword, Task_ID);
  75
  76    function To_FAB_RAB is new
  77      Unchecked_Conversion (Address, FAB_RAB_Access_Type);
  78
  79    ---------------------------
  80    -- Interrupt_AST_Handler --
  81    ---------------------------
  82
  83    procedure Interrupt_AST_Handler (ID : Address) is
  84       Result     : Interfaces.C.int;
  85       AST_Self_ID    : Task_ID := To_Task_Id (ID);
  86    begin
  87       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
  88       pragma Assert (Result = 0);
  89    end Interrupt_AST_Handler;
  90
  91    ---------------------
  92    -- RMS_AST_Handler --
  93    ---------------------
  94
  95    procedure RMS_AST_Handler (ID : Address) is
  96       AST_Self_ID    : Task_ID := To_Task_Id (To_FAB_RAB (ID).CTX);
  97       Result     : Interfaces.C.int;
  98    begin
  99       AST_Self_ID.Common.LL.AST_Pending := False;
 100       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 101       pragma Assert (Result = 0);
 102    end RMS_AST_Handler;
 103
 104    ----------
 105    -- Self --
 106    ----------
 107
 108    function Self return Unsigned_Longword is
 109       Self_ID : Task_ID := Self;
 110    begin
 111       Self_ID.Common.LL.AST_Pending := True;
 112       return To_Unsigned_Longword (Self);
 113    end Self;
 114
 115    -------------------------
 116    -- Starlet_AST_Handler --
 117    -------------------------
 118
 119    procedure Starlet_AST_Handler (ID : Address) is
 120       Result     : Interfaces.C.int;
 121       AST_Self_ID    : Task_ID := To_Task_Id (ID);
 122    begin
 123       AST_Self_ID.Common.LL.AST_Pending := False;
 124       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 125       pragma Assert (Result = 0);
 126    end Starlet_AST_Handler;
 127
 128    ----------------
 129    -- Task_Synch --
 130    ----------------
 131
 132    procedure Task_Synch is
 133       Synch_Self_ID : Task_ID := Self;
 134    begin
 135       Write_Lock (Synch_Self_ID);
 136       Synch_Self_ID.Common.State := AST_Server_Sleep;
 137       while Synch_Self_ID.Common.LL.AST_Pending loop
 138          Sleep (Synch_Self_ID, AST_Server_Sleep);
 139       end loop;
 140       Synch_Self_ID.Common.State := Runnable;
 141       Unlock (Synch_Self_ID);
 142    end Task_Synch;
 143
 144 end System.Task_Primitives.Operations.DEC;