gcc/ada/5vtpopde.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 --                                                                          --
  10 --           Copyright (C) 2000-2001 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,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, 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.Tasking;
  39 with Unchecked_Conversion;
  40
  41 package body System.Task_Primitives.Operations.DEC is
  42
  43    use System.OS_Interface;
  44    use System.Tasking;
  45    use System.Aux_DEC;
  46    use type Interfaces.C.int;
  47
  48    --  The FAB_RAB_Type specifies where the context field (the calling
  49    --  task) is stored.  Other fields defined for FAB_RAB aren't need and
  50    --  so are ignored.
  51
  52    type FAB_RAB_Type is record
  53       CTX : Unsigned_Longword;
  54    end record;
  55
  56    for FAB_RAB_Type use record
  57       CTX at 24 range 0 .. 31;
  58    end record;
  59
  60    for FAB_RAB_Type'Size use 224;
  61
  62    type FAB_RAB_Access_Type is access all FAB_RAB_Type;
  63
  64    -----------------------
  65    -- Local Subprograms --
  66    -----------------------
  67
  68    function To_Unsigned_Longword is new
  69      Unchecked_Conversion (Task_ID, Unsigned_Longword);
  70
  71    function To_Task_Id is new
  72      Unchecked_Conversion (Unsigned_Longword, Task_ID);
  73
  74    function To_FAB_RAB is new
  75      Unchecked_Conversion (Address, FAB_RAB_Access_Type);
  76
  77    ---------------------------
  78    -- Interrupt_AST_Handler --
  79    ---------------------------
  80
  81    procedure Interrupt_AST_Handler (ID : Address) is
  82       Result      : Interfaces.C.int;
  83       AST_Self_ID : Task_ID := To_Task_Id (ID);
  84
  85    begin
  86       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
  87       pragma Assert (Result = 0);
  88    end Interrupt_AST_Handler;
  89
  90    ---------------------
  91    -- RMS_AST_Handler --
  92    ---------------------
  93
  94    procedure RMS_AST_Handler (ID : Address) is
  95       AST_Self_ID : Task_ID := To_Task_Id (To_FAB_RAB (ID).CTX);
  96       Result      : Interfaces.C.int;
  97
  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
 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 : Task_ID := To_Task_Id (ID);
 123
 124    begin
 125       AST_Self_ID.Common.LL.AST_Pending := False;
 126       Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);
 127       pragma Assert (Result = 0);
 128    end Starlet_AST_Handler;
 129
 130    ----------------
 131    -- Task_Synch --
 132    ----------------
 133
 134    procedure Task_Synch is
 135       Synch_Self_ID : Task_ID := Self;
 136
 137    begin
 138       Write_Lock (Synch_Self_ID);
 139       Synch_Self_ID.Common.State := AST_Server_Sleep;
 140
 141       while Synch_Self_ID.Common.LL.AST_Pending loop
 142          Sleep (Synch_Self_ID, AST_Server_Sleep);
 143       end loop;
 144
 145       Synch_Self_ID.Common.State := Runnable;
 146       Unlock (Synch_Self_ID);
 147    end Task_Synch;
 148
 149 end System.Task_Primitives.Operations.DEC;