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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- G N A T . T H R E A D S --
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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) 1998-2018, AdaCore --
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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 -- GNAT was originally developed by the GNAT team at New York 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.Task_Identification; use Ada.Task_Identification;
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33 with System.Task_Primitives.Operations;
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34 with System.Tasking;
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35 with System.Tasking.Stages; use System.Tasking.Stages;
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131
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36 with System.Tasking.Utilities;
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111
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37 with System.OS_Interface; use System.OS_Interface;
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38 with System.Soft_Links; use System.Soft_Links;
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39 with Ada.Unchecked_Conversion;
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40
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41 package body GNAT.Threads is
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42
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43 use System;
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44
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45 package STPO renames System.Task_Primitives.Operations;
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46
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47 type Thread_Id_Ptr is access all Thread_Id;
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48
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49 pragma Warnings (Off);
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50 -- The following unchecked conversions are aliasing safe, since they
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51 -- are never used to create pointers to improperly aliased data.
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52
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53 function To_Addr is new Ada.Unchecked_Conversion (Task_Id, Address);
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54 function To_Id is new Ada.Unchecked_Conversion (Address, Task_Id);
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55 function To_Id is new Ada.Unchecked_Conversion (Address, Tasking.Task_Id);
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56 function To_Tid is new Ada.Unchecked_Conversion
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57 (Address, Ada.Task_Identification.Task_Id);
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58 function To_Thread is new Ada.Unchecked_Conversion (Address, Thread_Id_Ptr);
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59
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60 pragma Warnings (On);
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61
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62 type Code_Proc is access procedure (Id : Address; Parm : Void_Ptr);
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63
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64 task type Thread
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65 (Stsz : Natural;
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66 Prio : Any_Priority;
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67 Parm : Void_Ptr;
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68 Code : Code_Proc)
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69 is
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70 pragma Priority (Prio);
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71 pragma Storage_Size (Stsz);
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72 end Thread;
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73
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74 task body Thread is
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75 begin
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76 Code.all (To_Addr (Current_Task), Parm);
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77 end Thread;
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78
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79 type Tptr is access Thread;
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80
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81 -------------------
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82 -- Create_Thread --
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83 -------------------
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84
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85 function Create_Thread
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86 (Code : Address;
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87 Parm : Void_Ptr;
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88 Size : Natural;
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89 Prio : Integer) return System.Address
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90 is
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91 TP : Tptr;
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92
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93 function To_CP is new Ada.Unchecked_Conversion (Address, Code_Proc);
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94
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95 begin
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96 TP := new Thread (Size, Prio, Parm, To_CP (Code));
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97 return To_Addr (TP'Identity);
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98 end Create_Thread;
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99
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100 ---------------------
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101 -- Register_Thread --
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102 ---------------------
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103
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104 function Register_Thread return System.Address is
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105 begin
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106 return Task_Primitives.Operations.Register_Foreign_Thread.all'Address;
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107 end Register_Thread;
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108
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109 -----------------------
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110 -- Unregister_Thread --
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111 -----------------------
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112
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113 procedure Unregister_Thread is
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114 Self_Id : constant Tasking.Task_Id := Task_Primitives.Operations.Self;
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115 begin
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116 Self_Id.Common.State := Tasking.Terminated;
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117 Destroy_TSD (Self_Id.Common.Compiler_Data);
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118 Free_Task (Self_Id);
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119 end Unregister_Thread;
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120
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121 --------------------------
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122 -- Unregister_Thread_Id --
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123 --------------------------
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124
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125 procedure Unregister_Thread_Id (Thread : System.Address) is
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126 Thr : constant Thread_Id := To_Thread (Thread).all;
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127 T : Tasking.Task_Id;
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128
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129 use type Tasking.Task_Id;
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130 -- This use clause should be removed once a visibility problem
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131 -- with the MaRTE run time has been fixed. ???
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132
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133 pragma Warnings (Off);
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134 use type System.OS_Interface.Thread_Id;
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135 pragma Warnings (On);
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136
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137 begin
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138 STPO.Lock_RTS;
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139
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140 T := Tasking.All_Tasks_List;
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141 loop
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142 exit when T = null or else STPO.Get_Thread_Id (T) = Thr;
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143
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144 T := T.Common.All_Tasks_Link;
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145 end loop;
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146
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147 STPO.Unlock_RTS;
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148
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149 if T /= null then
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150 T.Common.State := Tasking.Terminated;
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151 Destroy_TSD (T.Common.Compiler_Data);
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152 Free_Task (T);
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153 end if;
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154 end Unregister_Thread_Id;
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155
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156 --------------------
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157 -- Destroy_Thread --
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158 --------------------
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159
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160 procedure Destroy_Thread (Id : Address) is
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161 Tid : constant Task_Id := To_Id (Id);
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162 begin
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163 Abort_Task (Tid);
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164 end Destroy_Thread;
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165
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166 ----------------
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167 -- Get_Thread --
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168 ----------------
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169
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170 procedure Get_Thread (Id : Address; Thread : Address) is
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171 Thr : constant Thread_Id_Ptr := To_Thread (Thread);
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172 begin
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173 Thr.all := Task_Primitives.Operations.Get_Thread_Id (To_Id (Id));
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174 end Get_Thread;
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175
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131
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176 ----------------------
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177 -- Make_Independent --
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178 ----------------------
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179
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180 function Make_Independent return Boolean is
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181 begin
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182 return System.Tasking.Utilities.Make_Independent;
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183 end Make_Independent;
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184
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111
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185 ----------------
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186 -- To_Task_Id --
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187 ----------------
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188
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189 function To_Task_Id
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190 (Id : System.Address) return Ada.Task_Identification.Task_Id
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191 is
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192 begin
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193 return To_Tid (Id);
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194 end To_Task_Id;
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195
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196 end GNAT.Threads;
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