gcc/ada/s-tpopde-vms.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --                  SYSTEM.TASK_PRIMITIVES.OPERATIONS.DEC                   --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --          Copyright (C) 2000-2009, 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 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT 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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --   This package is for OpenVMS/Alpha
  33
  34 with System.OS_Interface;
  35 with System.Parameters;
  36 with System.Tasking;
  37 with Ada.Unchecked_Conversion;
  38 with System.Soft_Links;
  39
  40 package body System.Task_Primitives.Operations.DEC is
  41
  42    use System.OS_Interface;
  43    use System.Parameters;
  44    use System.Tasking;
  45    use System.Aux_DEC;
  46    use type Interfaces.C.int;
  47
  48    package SSL renames System.Soft_Links;
  49
  50    --  The FAB_RAB_Type specifies where the context field (the calling
  51    --  task) is stored.  Other fields defined for FAB_RAB arent' need and
  52    --  so are ignored.
  53
  54    type FAB_RAB_Type is record
  55       CTX : Unsigned_Longword;
  56    end record;
  57
  58    for FAB_RAB_Type use 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      Ada.Unchecked_Conversion (Task_Id, Unsigned_Longword);
  72
  73    function To_Task_Id is new
  74      Ada.Unchecked_Conversion (Unsigned_Longword, Task_Id);
  75
  76    function To_FAB_RAB is new
  77      Ada.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 : constant 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 : constant Task_Id := To_Task_Id (To_FAB_RAB (ID).CTX);
  97       Result      : Interfaces.C.int;
  98
  99    begin
 100       AST_Self_ID.Common.LL.AST_Pending := False;
 101       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 102       pragma Assert (Result = 0);
 103    end RMS_AST_Handler;
 104
 105    ----------
 106    -- Self --
 107    ----------
 108
 109    function Self return Unsigned_Longword is
 110       Self_ID : constant Task_Id := Self;
 111    begin
 112       Self_ID.Common.LL.AST_Pending := True;
 113       return To_Unsigned_Longword (Self);
 114    end Self;
 115
 116    -------------------------
 117    -- Starlet_AST_Handler --
 118    -------------------------
 119
 120    procedure Starlet_AST_Handler (ID : Address) is
 121       Result      : Interfaces.C.int;
 122       AST_Self_ID : constant Task_Id := To_Task_Id (ID);
 123    begin
 124       AST_Self_ID.Common.LL.AST_Pending := False;
 125       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 126       pragma Assert (Result = 0);
 127    end Starlet_AST_Handler;
 128
 129    ----------------
 130    -- Task_Synch --
 131    ----------------
 132
 133    procedure Task_Synch is
 134       Synch_Self_ID : constant Task_Id := Self;
 135
 136    begin
 137       if Single_Lock then
 138          Lock_RTS;
 139       else
 140          Write_Lock (Synch_Self_ID);
 141       end if;
 142
 143       SSL.Abort_Defer.all;
 144       Synch_Self_ID.Common.State := AST_Server_Sleep;
 145
 146       while Synch_Self_ID.Common.LL.AST_Pending loop
 147          Sleep (Synch_Self_ID, AST_Server_Sleep);
 148       end loop;
 149
 150       Synch_Self_ID.Common.State := Runnable;
 151
 152       if Single_Lock then
 153          Unlock_RTS;
 154       else
 155          Unlock (Synch_Self_ID);
 156       end if;
 157
 158       SSL.Abort_Undefer.all;
 159    end Task_Synch;
 160
 161 end System.Task_Primitives.Operations.DEC;