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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 -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T --
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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 Solaris version of this package
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33
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34 -- Make a careful study of all signals available under the OS, to see which
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35 -- need to be reserved, kept always unmasked, or kept always unmasked.
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36
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37 -- Be on the lookout for special signals that may be used by the thread
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38 -- library.
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39
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40 package body System.Interrupt_Management is
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41
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42 use Interfaces.C;
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43 use System.OS_Interface;
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44
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45 type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
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46
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47 Exception_Interrupts : constant Interrupt_List :=
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48 (SIGFPE, SIGILL, SIGSEGV, SIGBUS);
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49
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50 Unreserve_All_Interrupts : Interfaces.C.int;
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51 pragma Import
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52 (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
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53
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54 function State (Int : Interrupt_ID) return Character;
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55 pragma Import (C, State, "__gnat_get_interrupt_state");
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56 -- Get interrupt state. Defined in init.c
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57 -- The input argument is the interrupt number,
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58 -- and the result is one of the following:
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59
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60 User : constant Character := 'u';
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61 Runtime : constant Character := 'r';
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62 Default : constant Character := 's';
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63 -- 'n' this interrupt not set by any Interrupt_State pragma
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64 -- 'u' Interrupt_State pragma set state to User
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65 -- 'r' Interrupt_State pragma set state to Runtime
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66 -- 's' Interrupt_State pragma set state to System (use "default"
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67 -- system handler)
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68
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69 ----------------------
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70 -- Notify_Exception --
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71 ----------------------
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72
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73 -- This function identifies the Ada exception to be raised using the
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74 -- information when the system received a synchronous signal. Since this
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75 -- function is machine and OS dependent, different code has to be provided
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76 -- for different target.
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77
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78 procedure Notify_Exception
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79 (signo : Signal;
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80 info : access siginfo_t;
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81 context : access ucontext_t);
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82
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83 ----------------------
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84 -- Notify_Exception --
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85 ----------------------
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86
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87 procedure Notify_Exception
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88 (signo : Signal;
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89 info : access siginfo_t;
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90 context : access ucontext_t)
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91 is
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92 pragma Unreferenced (info);
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93
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94 begin
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95 -- Perform the necessary context adjustments prior to a raise from a
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96 -- signal handler.
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97
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98 Adjust_Context_For_Raise (signo, context.all'Address);
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99
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100 -- Check that treatment of exception propagation here is consistent with
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101 -- treatment of the abort signal in System.Task_Primitives.Operations.
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102
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103 case signo is
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104 when SIGFPE => raise Constraint_Error;
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105 when SIGILL => raise Program_Error;
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106 when SIGSEGV => raise Storage_Error;
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107 when SIGBUS => raise Storage_Error;
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108 when others => null;
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109 end case;
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110 end Notify_Exception;
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111
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112 ----------------
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113 -- Initialize --
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114 ----------------
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115
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116 Initialized : Boolean := False;
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117
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118 procedure Initialize is
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119 act : aliased struct_sigaction;
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120 old_act : aliased struct_sigaction;
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121 mask : aliased sigset_t;
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122 Result : Interfaces.C.int;
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123
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124 begin
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125 if Initialized then
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126 return;
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127 end if;
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128
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129 Initialized := True;
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130
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131 -- Need to call pthread_init very early because it is doing signal
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132 -- initializations.
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133
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134 pthread_init;
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135
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136 -- Change this if you want to use another signal for task abort.
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137 -- SIGTERM might be a good one.
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138
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139 Abort_Task_Interrupt := SIGABRT;
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140
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141 act.sa_handler := Notify_Exception'Address;
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142
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143 -- Set sa_flags to SA_NODEFER so that during the handler execution
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144 -- we do not change the Signal_Mask to be masked for the Signal.
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145 -- This is a temporary fix to the problem that the Signal_Mask is
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146 -- not restored after the exception (longjmp) from the handler.
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147 -- The right fix should be made in sigsetjmp so that we save
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148 -- the Signal_Set and restore it after a longjmp.
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149
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150 -- In that case, this field should be changed back to 0. ??? (Dong-Ik)
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151
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152 act.sa_flags := 16;
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153
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154 Result := sigemptyset (mask'Access);
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155 pragma Assert (Result = 0);
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156
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157 -- ??? For the same reason explained above, we can't mask these signals
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158 -- because otherwise we won't be able to catch more than one signal.
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159
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160 act.sa_mask := mask;
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161
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162 pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
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163 pragma Assert (Reserve = (Interrupt_ID'Range => False));
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164
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165 for J in Exception_Interrupts'Range loop
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166 if State (Exception_Interrupts (J)) /= User then
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167 Keep_Unmasked (Exception_Interrupts (J)) := True;
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168 Reserve (Exception_Interrupts (J)) := True;
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169
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170 if State (Exception_Interrupts (J)) /= Default then
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171 Result :=
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172 sigaction
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173 (Signal (Exception_Interrupts (J)), act'Unchecked_Access,
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174 old_act'Unchecked_Access);
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175 pragma Assert (Result = 0);
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176 end if;
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177 end if;
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178 end loop;
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179
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180 if State (Abort_Task_Interrupt) /= User then
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181 Keep_Unmasked (Abort_Task_Interrupt) := True;
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182 Reserve (Abort_Task_Interrupt) := True;
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183 end if;
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184
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185 -- Set SIGINT to unmasked state as long as it's
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186 -- not in "User" state. Check for Unreserve_All_Interrupts last
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187
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188 if State (SIGINT) /= User then
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189 Keep_Unmasked (SIGINT) := True;
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190 Reserve (SIGINT) := True;
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191 end if;
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192
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193 -- Check all signals for state that requires keeping them
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194 -- unmasked and reserved
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195
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196 for J in Interrupt_ID'Range loop
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197 if State (J) = Default or else State (J) = Runtime then
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198 Keep_Unmasked (J) := True;
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199 Reserve (J) := True;
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200 end if;
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201 end loop;
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202
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203 -- Add the set of signals that must always be unmasked for this target
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204
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205 for J in Unmasked'Range loop
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206 Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True;
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207 Reserve (Interrupt_ID (Unmasked (J))) := True;
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208 end loop;
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209
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210 -- Add target-specific reserved signals
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211
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212 for J in Reserved'Range loop
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213 Reserve (Interrupt_ID (Reserved (J))) := True;
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214 end loop;
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215
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216 -- Process pragma Unreserve_All_Interrupts. This overrides any
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217 -- settings due to pragma Interrupt_State:
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218
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219 if Unreserve_All_Interrupts /= 0 then
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220 Keep_Unmasked (SIGINT) := False;
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221 Reserve (SIGINT) := False;
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222 end if;
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223
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224 -- We do not have Signal 0 in reality. We just use this value to
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225 -- identify not existing signals (see s-intnam.ads). Therefore, Signal 0
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226 -- should not be used in all signal related operations hence mark it as
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227 -- reserved.
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228
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229 Reserve (0) := True;
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230 end Initialize;
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231
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232 end System.Interrupt_Management;
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