gcc/ada/s-tpopde-vms.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT 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 --           Copyright (C) 2000-2005 Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, USA.                                              --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --   This package is for OpenVMS/Alpha
  36
  37 with System.OS_Interface;
  38 with System.Parameters;
  39 with System.Tasking;
  40 with Unchecked_Conversion;
  41 with System.Soft_Links;
  42
  43 package body System.Task_Primitives.Operations.DEC is
  44
  45    use System.OS_Interface;
  46    use System.Parameters;
  47    use System.Tasking;
  48    use System.Aux_DEC;
  49    use type Interfaces.C.int;
  50
  51    package SSL renames System.Soft_Links;
  52
  53    --  The FAB_RAB_Type specifies where the context field (the calling
  54    --  task) is stored.  Other fields defined for FAB_RAB arent' need and
  55    --  so are ignored.
  56
  57    type FAB_RAB_Type is record
  58       CTX : Unsigned_Longword;
  59    end record;
  60
  61    for FAB_RAB_Type use record
  62       CTX at 24 range 0 .. 31;
  63    end record;
  64
  65    for FAB_RAB_Type'Size use 224;
  66
  67    type FAB_RAB_Access_Type is access all FAB_RAB_Type;
  68
  69    -----------------------
  70    -- Local Subprograms --
  71    -----------------------
  72
  73    pragma Warnings (Off);
  74    --  Task_Id is 64 bits wide (but only 32 bits significant) on Integrity/VMS
  75
  76    function To_Unsigned_Longword is new
  77      Unchecked_Conversion (Task_Id, Unsigned_Longword);
  78
  79    function To_Task_Id is new
  80      Unchecked_Conversion (Unsigned_Longword, Task_Id);
  81
  82    pragma Warnings (On);
  83
  84    function To_FAB_RAB is new
  85      Unchecked_Conversion (Address, FAB_RAB_Access_Type);
  86
  87    ---------------------------
  88    -- Interrupt_AST_Handler --
  89    ---------------------------
  90
  91    procedure Interrupt_AST_Handler (ID : Address) is
  92       Result      : Interfaces.C.int;
  93       AST_Self_ID : constant Task_Id := To_Task_Id (ID);
  94    begin
  95       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
  96       pragma Assert (Result = 0);
  97    end Interrupt_AST_Handler;
  98
  99    ---------------------
 100    -- RMS_AST_Handler --
 101    ---------------------
 102
 103    procedure RMS_AST_Handler (ID : Address) is
 104       AST_Self_ID : constant Task_Id := To_Task_Id (To_FAB_RAB (ID).CTX);
 105       Result      : Interfaces.C.int;
 106
 107    begin
 108       AST_Self_ID.Common.LL.AST_Pending := False;
 109       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 110       pragma Assert (Result = 0);
 111    end RMS_AST_Handler;
 112
 113    ----------
 114    -- Self --
 115    ----------
 116
 117    function Self return Unsigned_Longword is
 118       Self_ID : constant Task_Id := Self;
 119    begin
 120       Self_ID.Common.LL.AST_Pending := True;
 121       return To_Unsigned_Longword (Self);
 122    end Self;
 123
 124    -------------------------
 125    -- Starlet_AST_Handler --
 126    -------------------------
 127
 128    procedure Starlet_AST_Handler (ID : Address) is
 129       Result      : Interfaces.C.int;
 130       AST_Self_ID : constant Task_Id := To_Task_Id (ID);
 131    begin
 132       AST_Self_ID.Common.LL.AST_Pending := False;
 133       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 134       pragma Assert (Result = 0);
 135    end Starlet_AST_Handler;
 136
 137    ----------------
 138    -- Task_Synch --
 139    ----------------
 140
 141    procedure Task_Synch is
 142       Synch_Self_ID : constant Task_Id := Self;
 143
 144    begin
 145       if Single_Lock then
 146          Lock_RTS;
 147       else
 148          Write_Lock (Synch_Self_ID);
 149       end if;
 150
 151       SSL.Abort_Defer.all;
 152       Synch_Self_ID.Common.State := AST_Server_Sleep;
 153
 154       while Synch_Self_ID.Common.LL.AST_Pending loop
 155          Sleep (Synch_Self_ID, AST_Server_Sleep);
 156       end loop;
 157
 158       Synch_Self_ID.Common.State := Runnable;
 159
 160       if Single_Lock then
 161          Unlock_RTS;
 162       else
 163          Unlock (Synch_Self_ID);
 164       end if;
 165
 166       SSL.Abort_Undefer.all;
 167    end Task_Synch;
 168
 169 end System.Task_Primitives.Operations.DEC;