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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.SPECIFIC --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT 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 -- This is a VxWorks version of this package using Thread_Local_Storage
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33 -- support (VxWorks 6.6 and higher). The implementation is based on __threads
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34 -- support.
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35
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36 separate (System.Task_Primitives.Operations)
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37 package body Specific is
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38
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39 ATCB : aliased Task_Id := null;
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40 -- Ada Task_Id associated with a thread
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41 pragma Thread_Local_Storage (ATCB);
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42
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43 ----------------
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44 -- Initialize --
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45 ----------------
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46
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47 procedure Initialize is
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48 begin
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49 null;
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50 end Initialize;
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51
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52 -------------------
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53 -- Is_Valid_Task --
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54 -------------------
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55
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56 function Is_Valid_Task return Boolean is
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57 begin
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58 return ATCB /= Null_Task;
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59 end Is_Valid_Task;
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60
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61 ---------
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62 -- Set --
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63 ---------
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64
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65 procedure Set (Self_Id : Task_Id) is
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66 begin
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67 ATCB := Self_Id;
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68 end Set;
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69
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70 ----------
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71 -- Self --
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72 ----------
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73
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74 -- To make Ada tasks and C threads interoperate better, we have added some
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75 -- functionality to Self. Suppose a C main program (with threads) calls an
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76 -- Ada procedure and the Ada procedure calls the tasking runtime system.
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77 -- Eventually, a call will be made to self. Since the call is not coming
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78 -- from an Ada task, there will be no corresponding ATCB.
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79
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80 -- What we do in Self is to catch references that do not come from
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81 -- recognized Ada tasks, and create an ATCB for the calling thread.
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82
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83 -- The new ATCB will be "detached" from the normal Ada task master
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84 -- hierarchy, much like the existing implicitly created signal-server
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85 -- tasks.
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86
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87 function Self return Task_Id is
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88 Result : constant Task_Id := ATCB;
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89 begin
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90 if Result /= null then
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91 return Result;
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92 else
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93 -- If the value is Null then it is a non-Ada task
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94
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95 return Register_Foreign_Thread;
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96 end if;
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97 end Self;
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98
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99 end Specific;
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