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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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131
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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 -- 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 VxWorks version of this package where foreign threads are
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33 -- recognized. The implementation is based on VxWorks taskVarLib.
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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 System.Address := System.Null_Address;
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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 ATCB_Key_Addr : System.Address := ATCB_Key'Address;
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42 pragma Export (Ada, ATCB_Key_Addr, "__gnat_ATCB_key_addr");
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43 -- Exported to support the temporary AE653 task registration
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44 -- implementation. This mechanism is used to minimize impact on other
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45 -- targets.
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46
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47 Stack_Limit : aliased System.Address;
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48
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49 pragma Import (C, Stack_Limit, "__gnat_stack_limit");
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50
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51 type Set_Stack_Limit_Proc_Acc is access procedure;
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52 pragma Convention (C, Set_Stack_Limit_Proc_Acc);
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53
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54 Set_Stack_Limit_Hook : Set_Stack_Limit_Proc_Acc;
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55 pragma Import (C, Set_Stack_Limit_Hook, "__gnat_set_stack_limit_hook");
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56 -- Procedure to be called when a task is created to set stack limit if
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57 -- limit checking is used.
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58
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59 ----------------
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60 -- Initialize --
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61 ----------------
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62
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63 procedure Initialize is
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64 begin
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65 null;
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66 end Initialize;
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67
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68 -------------------
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69 -- Is_Valid_Task --
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70 -------------------
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71
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72 function Is_Valid_Task return Boolean is
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73 begin
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74 return taskVarGet (taskIdSelf, ATCB_Key'Access) /= ERROR;
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75 end Is_Valid_Task;
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76
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77 ---------
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78 -- Set --
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79 ---------
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80
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81 procedure Set (Self_Id : Task_Id) is
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82 Result : STATUS;
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83
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84 begin
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85 -- If argument is null, destroy task specific data, to make API
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86 -- consistent with other platforms, and thus compatible with the
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87 -- shared version of s-tpoaal.adb.
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88
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89 if Self_Id = null then
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90 Result := taskVarDelete (taskIdSelf, ATCB_Key'Access);
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91 pragma Assert (Result /= ERROR);
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92 return;
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93 end if;
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94
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95 if not Is_Valid_Task then
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96 Result := taskVarAdd (Self_Id.Common.LL.Thread, ATCB_Key'Access);
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97 pragma Assert (Result = OK);
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98
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99 if Stack_Check_Limits
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100 and then Result /= ERROR
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101 and then Set_Stack_Limit_Hook /= null
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102 then
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103 -- This will be initialized from taskInfoGet() once the task is
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104 -- is running.
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105
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106 Result :=
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107 taskVarAdd (Self_Id.Common.LL.Thread, Stack_Limit'Access);
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108 pragma Assert (Result /= ERROR);
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109 end if;
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110 end if;
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111
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112 Result :=
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113 taskVarSet
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114 (Self_Id.Common.LL.Thread,
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115 ATCB_Key'Access,
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116 To_Address (Self_Id));
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117 pragma Assert (Result /= ERROR);
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118 end Set;
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119
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120 ----------
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121 -- Self --
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122 ----------
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123
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124 -- To make Ada tasks and C threads interoperate better, we have added some
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125 -- functionality to Self. Suppose a C main program (with threads) calls an
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126 -- Ada procedure and the Ada procedure calls the tasking runtime system.
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127 -- Eventually, a call will be made to self. Since the call is not coming
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128 -- from an Ada task, there will be no corresponding ATCB.
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129
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130 -- What we do in Self is to catch references that do not come from
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131 -- recognized Ada tasks, and create an ATCB for the calling thread.
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132
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133 -- The new ATCB will be "detached" from the normal Ada task master
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134 -- hierarchy, much like the existing implicitly created signal-server
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135 -- tasks.
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136
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137 function Self return Task_Id is
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138 Result : constant Task_Id := To_Task_Id (ATCB_Key);
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139 begin
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140 if Result /= null then
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141 return Result;
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142 else
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143 -- If the value is Null then it is a non-Ada task
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144
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145 return Register_Foreign_Thread;
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146 end if;
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147 end Self;
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148
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149 end Specific;
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