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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 -- A D A . T A S K _ T E R M I N A T I O N --
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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) 2005-2019, 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 -- 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 System.Tasking;
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33 with System.Task_Primitives.Operations;
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34 with System.Parameters;
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35 with System.Soft_Links;
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36
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37 with Ada.Unchecked_Conversion;
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38
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39 package body Ada.Task_Termination is
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40
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41 use type Ada.Task_Identification.Task_Id;
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42
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43 package STPO renames System.Task_Primitives.Operations;
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44 package SSL renames System.Soft_Links;
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45
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46 use System.Parameters;
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47
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48 -----------------------
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49 -- Local subprograms --
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50 -----------------------
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51
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52 function To_TT is new Ada.Unchecked_Conversion
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53 (System.Tasking.Termination_Handler, Termination_Handler);
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54
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55 function To_ST is new Ada.Unchecked_Conversion
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56 (Termination_Handler, System.Tasking.Termination_Handler);
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57
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58 function To_Task_Id is new Ada.Unchecked_Conversion
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59 (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);
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60
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61 -----------------------------------
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62 -- Current_Task_Fallback_Handler --
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63 -----------------------------------
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64
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65 function Current_Task_Fallback_Handler return Termination_Handler is
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66 begin
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67 -- There is no need for explicit protection against race conditions
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68 -- for this function because this function can only be executed by
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69 -- Self, and the Fall_Back_Handler can only be modified by Self.
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70
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71 return To_TT (STPO.Self.Common.Fall_Back_Handler);
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72 end Current_Task_Fallback_Handler;
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73
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74 -------------------------------------
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75 -- Set_Dependents_Fallback_Handler --
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76 -------------------------------------
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77
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78 procedure Set_Dependents_Fallback_Handler
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79 (Handler : Termination_Handler)
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80 is
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81 Self : constant System.Tasking.Task_Id := STPO.Self;
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82
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83 begin
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84 SSL.Abort_Defer.all;
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85
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86 if Single_Lock then
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87 STPO.Lock_RTS;
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88 end if;
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89
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90 STPO.Write_Lock (Self);
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91
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92 Self.Common.Fall_Back_Handler := To_ST (Handler);
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93
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94 STPO.Unlock (Self);
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95
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96 if Single_Lock then
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97 STPO.Unlock_RTS;
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98 end if;
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99
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100 SSL.Abort_Undefer.all;
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101 end Set_Dependents_Fallback_Handler;
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102
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103 --------------------------
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104 -- Set_Specific_Handler --
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105 --------------------------
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106
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107 procedure Set_Specific_Handler
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108 (T : Ada.Task_Identification.Task_Id;
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109 Handler : Termination_Handler)
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110 is
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111 begin
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112 -- Tasking_Error is raised if the task identified by T has already
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113 -- terminated. Program_Error is raised if the value of T is
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114 -- Null_Task_Id.
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115
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116 if T = Ada.Task_Identification.Null_Task_Id then
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117 raise Program_Error;
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118 elsif Ada.Task_Identification.Is_Terminated (T) then
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119 raise Tasking_Error;
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120 else
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121 declare
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122 Target : constant System.Tasking.Task_Id := To_Task_Id (T);
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123
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124 begin
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125 SSL.Abort_Defer.all;
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126
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127 if Single_Lock then
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128 STPO.Lock_RTS;
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129 end if;
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130
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131 STPO.Write_Lock (Target);
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132
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133 Target.Common.Specific_Handler := To_ST (Handler);
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134
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135 STPO.Unlock (Target);
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136
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137 if Single_Lock then
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138 STPO.Unlock_RTS;
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139 end if;
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140
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141 SSL.Abort_Undefer.all;
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142 end;
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143 end if;
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144 end Set_Specific_Handler;
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145
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146 ----------------------
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147 -- Specific_Handler --
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148 ----------------------
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149
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150 function Specific_Handler
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151 (T : Ada.Task_Identification.Task_Id) return Termination_Handler
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152 is
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153 begin
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154 -- Tasking_Error is raised if the task identified by T has already
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155 -- terminated. Program_Error is raised if the value of T is
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156 -- Null_Task_Id.
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157
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158 if T = Ada.Task_Identification.Null_Task_Id then
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159 raise Program_Error;
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160 elsif Ada.Task_Identification.Is_Terminated (T) then
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161 raise Tasking_Error;
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162 else
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163 declare
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164 Target : constant System.Tasking.Task_Id := To_Task_Id (T);
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165 TH : Termination_Handler;
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166
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167 begin
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168 SSL.Abort_Defer.all;
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169
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170 if Single_Lock then
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171 STPO.Lock_RTS;
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172 end if;
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173
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174 STPO.Write_Lock (Target);
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175
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176 TH := To_TT (Target.Common.Specific_Handler);
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177
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178 STPO.Unlock (Target);
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179
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180 if Single_Lock then
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181 STPO.Unlock_RTS;
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182 end if;
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183
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184 SSL.Abort_Undefer.all;
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185
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186 return TH;
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187 end;
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188 end if;
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189 end Specific_Handler;
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190
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191 end Ada.Task_Termination;
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