gcc/ada/s-tpopde-vms.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                   SYSTEM.TASK_PRIMITIVES.OPERATIONS.DEC                  --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --           Copyright (C) 2000-2004 Free Software Foundation, Inc.         --
  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.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --   This package is for OpenVMS/Alpha
  35
  36 with System.OS_Interface;
  37 with System.Parameters;
  38 with System.Tasking;
  39 with Unchecked_Conversion;
  40 with System.Soft_Links;
  41
  42 package body System.Task_Primitives.Operations.DEC is
  43
  44    use System.OS_Interface;
  45    use System.Parameters;
  46    use System.Tasking;
  47    use System.Aux_DEC;
  48    use type Interfaces.C.int;
  49
  50    package SSL renames System.Soft_Links;
  51
  52    --  The FAB_RAB_Type specifies where the context field (the calling
  53    --  task) is stored.  Other fields defined for FAB_RAB arent' need and
  54    --  so are ignored.
  55
  56    type FAB_RAB_Type is record
  57       CTX : Unsigned_Longword;
  58    end record;
  59
  60    for FAB_RAB_Type use record
  61       CTX at 24 range 0 .. 31;
  62    end record;
  63
  64    for FAB_RAB_Type'Size use 224;
  65
  66    type FAB_RAB_Access_Type is access all FAB_RAB_Type;
  67
  68    -----------------------
  69    -- Local Subprograms --
  70    -----------------------
  71
  72    function To_Unsigned_Longword is new
  73      Unchecked_Conversion (Task_Id, Unsigned_Longword);
  74
  75    function To_Task_Id is new
  76      Unchecked_Conversion (Unsigned_Longword, Task_Id);
  77
  78    function To_FAB_RAB is new
  79      Unchecked_Conversion (Address, FAB_RAB_Access_Type);
  80
  81    ---------------------------
  82    -- Interrupt_AST_Handler --
  83    ---------------------------
  84
  85    procedure Interrupt_AST_Handler (ID : Address) is
  86       Result      : Interfaces.C.int;
  87       AST_Self_ID : constant Task_Id := To_Task_Id (ID);
  88    begin
  89       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
  90       pragma Assert (Result = 0);
  91    end Interrupt_AST_Handler;
  92
  93    ---------------------
  94    -- RMS_AST_Handler --
  95    ---------------------
  96
  97    procedure RMS_AST_Handler (ID : Address) is
  98       AST_Self_ID : constant Task_Id := To_Task_Id (To_FAB_RAB (ID).CTX);
  99       Result      : Interfaces.C.int;
 100
 101    begin
 102       AST_Self_ID.Common.LL.AST_Pending := False;
 103       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 104       pragma Assert (Result = 0);
 105    end RMS_AST_Handler;
 106
 107    ----------
 108    -- Self --
 109    ----------
 110
 111    function Self return Unsigned_Longword is
 112       Self_ID : constant Task_Id := Self;
 113    begin
 114       Self_ID.Common.LL.AST_Pending := True;
 115       return To_Unsigned_Longword (Self);
 116    end Self;
 117
 118    -------------------------
 119    -- Starlet_AST_Handler --
 120    -------------------------
 121
 122    procedure Starlet_AST_Handler (ID : Address) is
 123       Result      : Interfaces.C.int;
 124       AST_Self_ID : constant Task_Id := To_Task_Id (ID);
 125    begin
 126       AST_Self_ID.Common.LL.AST_Pending := False;
 127       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 128       pragma Assert (Result = 0);
 129    end Starlet_AST_Handler;
 130
 131    ----------------
 132    -- Task_Synch --
 133    ----------------
 134
 135    procedure Task_Synch is
 136       Synch_Self_ID : constant Task_Id := Self;
 137
 138    begin
 139       if Single_Lock then
 140          Lock_RTS;
 141       else
 142          Write_Lock (Synch_Self_ID);
 143       end if;
 144
 145       SSL.Abort_Defer.all;
 146       Synch_Self_ID.Common.State := AST_Server_Sleep;
 147
 148       while Synch_Self_ID.Common.LL.AST_Pending loop
 149          Sleep (Synch_Self_ID, AST_Server_Sleep);
 150       end loop;
 151
 152       Synch_Self_ID.Common.State := Runnable;
 153
 154       if Single_Lock then
 155          Unlock_RTS;
 156       else
 157          Unlock (Synch_Self_ID);
 158       end if;
 159
 160       SSL.Abort_Undefer.all;
 161    end Task_Synch;
 162
 163 end System.Task_Primitives.Operations.DEC;