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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.ATCB_ALLOCATION --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 2011-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with Ada.Unchecked_Deallocation;
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33
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34 separate (System.Task_Primitives.Operations)
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35 package body ATCB_Allocation is
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36
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37 ---------------
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38 -- Free_ATCB --
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39 ---------------
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40
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41 procedure Free_ATCB (T : Task_Id) is
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42 Tmp : Task_Id := T;
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43 Is_Self : constant Boolean := T = Self;
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44
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45 procedure Free is new
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46 Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
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47
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48 begin
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49 if Is_Self then
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50 declare
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51 Local_ATCB : aliased Ada_Task_Control_Block (0);
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52 -- Create a dummy ATCB and initialize it minimally so that "Free"
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53 -- can still call Self and Defer/Undefer_Abort after Tmp is freed
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54 -- by the underlying memory management library.
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55
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56 begin
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57 Local_ATCB.Common.LL.Thread := T.Common.LL.Thread;
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58 Local_ATCB.Common.Current_Priority := T.Common.Current_Priority;
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59
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60 Specific.Set (Local_ATCB'Unchecked_Access);
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61 Free (Tmp);
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62
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63 -- Note: it is assumed here that for all platforms, Specific.Set
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64 -- deletes the task specific information if passed a null value.
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65
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66 Specific.Set (null);
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67 end;
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68
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69 else
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70 Free (Tmp);
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71 end if;
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72 end Free_ATCB;
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73
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74 --------------
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75 -- New_ATCB --
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76 --------------
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77
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78 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
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79 begin
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80 return new Ada_Task_Control_Block (Entry_Num);
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81 end New_ATCB;
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82
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83 end ATCB_Allocation;
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