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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 . O S _ I N T E R F A C E --
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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) 1997-2018, 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 the VxWorks version
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33
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34 -- This package encapsulates all direct interfaces to OS services that are
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35 -- needed by children of System.
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36
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37 pragma Polling (Off);
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38 -- Turn off polling, we do not want ATC polling to take place during tasking
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39 -- operations. It causes infinite loops and other problems.
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40
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41 package body System.OS_Interface is
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42
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43 use type Interfaces.C.int;
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44
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45 Low_Priority : constant := 255;
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46 -- VxWorks native (default) lowest scheduling priority
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47
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48 -----------------
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49 -- To_Duration --
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50 -----------------
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51
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52 function To_Duration (TS : timespec) return Duration is
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53 begin
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54 return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
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55 end To_Duration;
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56
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57 -----------------
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58 -- To_Timespec --
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59 -----------------
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60
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61 function To_Timespec (D : Duration) return timespec is
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62 S : time_t;
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63 F : Duration;
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64
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65 begin
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66 S := time_t (Long_Long_Integer (D));
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67 F := D - Duration (S);
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68
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69 -- If F is negative due to a round-up, adjust for positive F value
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70
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71 if F < 0.0 then
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72 S := S - 1;
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73 F := F + 1.0;
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74 end if;
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75
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76 return timespec'(ts_sec => S,
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77 ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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78 end To_Timespec;
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79
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80 -------------------------
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81 -- To_VxWorks_Priority --
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82 -------------------------
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83
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84 function To_VxWorks_Priority (Priority : int) return int is
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85 begin
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86 return Low_Priority - Priority;
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87 end To_VxWorks_Priority;
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88
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89 --------------------
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90 -- To_Clock_Ticks --
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91 --------------------
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92
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93 -- ??? - For now, we'll always get the system clock rate since it is
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94 -- allowed to be changed during run-time in VxWorks. A better method would
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95 -- be to provide an operation to set it that so we can always know its
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96 -- value.
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97
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98 -- Another thing we should probably allow for is a resultant tick count
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99 -- greater than int'Last. This should probably be a procedure with two
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100 -- output parameters, one in the range 0 .. int'Last, and another
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101 -- representing the overflow count.
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102
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103 function To_Clock_Ticks (D : Duration) return int is
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104 Ticks : Long_Long_Integer;
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105 Rate_Duration : Duration;
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106 Ticks_Duration : Duration;
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107
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108 begin
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109 if D < 0.0 then
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110 return ERROR;
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111 end if;
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112
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113 -- Ensure that the duration can be converted to ticks
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114 -- at the current clock tick rate without overflowing.
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115
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116 Rate_Duration := Duration (sysClkRateGet);
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117
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118 if D > (Duration'Last / Rate_Duration) then
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119 Ticks := Long_Long_Integer (int'Last);
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120 else
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121 Ticks_Duration := D * Rate_Duration;
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122 Ticks := Long_Long_Integer (Ticks_Duration);
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123
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124 if Ticks_Duration > Duration (Ticks) then
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125 Ticks := Ticks + 1;
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126 end if;
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127
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128 if Ticks > Long_Long_Integer (int'Last) then
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129 Ticks := Long_Long_Integer (int'Last);
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130 end if;
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131 end if;
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132
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133 return int (Ticks);
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134 end To_Clock_Ticks;
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135
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136 -----------------------------
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137 -- Binary_Semaphore_Create --
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138 -----------------------------
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139
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140 function Binary_Semaphore_Create return Binary_Semaphore_Id is
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141 begin
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142 return Binary_Semaphore_Id (semBCreate (SEM_Q_FIFO, SEM_EMPTY));
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143 end Binary_Semaphore_Create;
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144
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145 -----------------------------
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146 -- Binary_Semaphore_Delete --
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147 -----------------------------
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148
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149 function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int is
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150 begin
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151 return semDelete (SEM_ID (ID));
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152 end Binary_Semaphore_Delete;
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153
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154 -----------------------------
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155 -- Binary_Semaphore_Obtain --
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156 -----------------------------
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157
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158 function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int is
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159 begin
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160 return semTake (SEM_ID (ID), WAIT_FOREVER);
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161 end Binary_Semaphore_Obtain;
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162
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163 ------------------------------
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164 -- Binary_Semaphore_Release --
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165 ------------------------------
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166
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167 function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int is
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168 begin
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169 return semGive (SEM_ID (ID));
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170 end Binary_Semaphore_Release;
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171
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172 ----------------------------
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173 -- Binary_Semaphore_Flush --
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174 ----------------------------
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175
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176 function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int is
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177 begin
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178 return semFlush (SEM_ID (ID));
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179 end Binary_Semaphore_Flush;
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180
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181 ----------
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182 -- kill --
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183 ----------
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184
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185 function kill (pid : t_id; sig : Signal) return int is
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186 begin
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187 return System.VxWorks.Ext.kill (pid, int (sig));
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188 end kill;
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189
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190 -----------------------
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191 -- Interrupt_Connect --
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192 -----------------------
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193
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194 function Interrupt_Connect
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195 (Vector : Interrupt_Vector;
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196 Handler : Interrupt_Handler;
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197 Parameter : System.Address := System.Null_Address) return int is
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198 begin
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199 return
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200 System.VxWorks.Ext.Interrupt_Connect
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201 (System.VxWorks.Ext.Interrupt_Vector (Vector),
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202 System.VxWorks.Ext.Interrupt_Handler (Handler),
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203 Parameter);
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204 end Interrupt_Connect;
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205
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206 -----------------------
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207 -- Interrupt_Context --
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208 -----------------------
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209
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210 function Interrupt_Context return int is
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211 begin
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212 return System.VxWorks.Ext.Interrupt_Context;
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213 end Interrupt_Context;
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214
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215 --------------------------------
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216 -- Interrupt_Number_To_Vector --
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217 --------------------------------
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218
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219 function Interrupt_Number_To_Vector
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220 (intNum : int) return Interrupt_Vector
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221 is
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222 begin
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223 return Interrupt_Vector
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224 (System.VxWorks.Ext.Interrupt_Number_To_Vector (intNum));
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225 end Interrupt_Number_To_Vector;
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226
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227 -----------------
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228 -- Current_CPU --
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229 -----------------
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230
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231 function Current_CPU return Multiprocessors.CPU is
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232 begin
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233 -- ??? Should use vxworks multiprocessor interface
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234
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235 return Multiprocessors.CPU'First;
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236 end Current_CPU;
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237
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238 end System.OS_Interface;
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