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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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145
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9 -- Copyright (C) 1992-2019, 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 -- This is a POSIX version of this package where foreign threads are
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33 -- recognized.
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34
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35 separate (System.Task_Primitives.Operations)
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36 package body Specific is
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37
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38 ATCB_Key : aliased pthread_key_t;
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39 -- Key used to find the Ada Task_Id associated with a thread
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40
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41 ----------------
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42 -- Initialize --
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43 ----------------
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44
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45 procedure Initialize (Environment_Task : Task_Id) is
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46 pragma Warnings (Off, Environment_Task);
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47 Result : Interfaces.C.int;
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48
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49 begin
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50 Result := pthread_key_create (ATCB_Key'Access, null);
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51 pragma Assert (Result = 0);
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52 end Initialize;
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53
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54 -------------------
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55 -- Is_Valid_Task --
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56 -------------------
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57
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58 function Is_Valid_Task return Boolean is
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59 begin
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60 return pthread_getspecific (ATCB_Key) /= System.Null_Address;
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61 end Is_Valid_Task;
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62
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63 ---------
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64 -- Set --
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65 ---------
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66
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67 procedure Set (Self_Id : Task_Id) is
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68 Result : Interfaces.C.int;
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69 begin
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70 Result := pthread_setspecific (ATCB_Key, To_Address (Self_Id));
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71 pragma Assert (Result = 0);
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72 end Set;
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73
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74 ----------
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75 -- Self --
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76 ----------
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77
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78 -- To make Ada tasks and C threads interoperate better, we have added some
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79 -- functionality to Self. Suppose a C main program (with threads) calls an
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80 -- Ada procedure and the Ada procedure calls the tasking runtime system.
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81 -- Eventually, a call will be made to self. Since the call is not coming
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82 -- from an Ada task, there will be no corresponding ATCB.
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83
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84 -- What we do in Self is to catch references that do not come from
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85 -- recognized Ada tasks, and create an ATCB for the calling thread.
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86
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87 -- The new ATCB will be "detached" from the normal Ada task master
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88 -- hierarchy, much like the existing implicitly created signal-server
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89 -- tasks.
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90
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91 function Self return Task_Id is
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92 Result : System.Address;
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93
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94 begin
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95 Result := pthread_getspecific (ATCB_Key);
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96
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97 -- If the key value is Null then it is a non-Ada task
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98
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99 if Result /= System.Null_Address then
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100 return To_Task_Id (Result);
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101 else
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102 return Register_Foreign_Thread;
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103 end if;
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104 end Self;
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105
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106 end Specific;
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