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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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9 -- Copyright (C) 2001-2017, AdaCore --
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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 -- 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 -- Version of System.OS_Interface for LynxOS-178 (POSIX Threads)
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33
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34 pragma Polling (Off);
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35 -- Turn off polling, we do not want ATC polling to take place during tasking
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36 -- operations. It may cause infinite loops and other problems.
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37
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38 package body System.OS_Interface is
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39
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40 ------------------
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41 -- Current_CPU --
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42 ------------------
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43
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44 function Current_CPU return Multiprocessors.CPU is
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45 begin
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46 -- No multiprocessor support, always return the first CPU Id
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47
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48 return Multiprocessors.CPU'First;
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49 end Current_CPU;
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50
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51 --------------------
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52 -- Get_Affinity --
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53 --------------------
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54
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55 function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range is
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56 pragma Unreferenced (Id);
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57
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58 begin
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59 -- No multiprocessor support, always return Not_A_Specific_CPU
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60
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61 return Multiprocessors.Not_A_Specific_CPU;
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62 end Get_Affinity;
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63
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64 ---------------
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65 -- Get_CPU --
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66 ---------------
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67
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68 function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU is
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69 pragma Unreferenced (Id);
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70
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71 begin
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72 -- No multiprocessor support, always return the first CPU Id
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73
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74 return Multiprocessors.CPU'First;
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75 end Get_CPU;
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76
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77 -------------------
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78 -- Get_Page_Size --
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79 -------------------
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80
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81 SC_PAGESIZE : constant := 17;
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82 -- C macro to get pagesize value from sysconf
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83
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84 function sysconf (name : int) return long;
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85 pragma Import (C, sysconf, "sysconf");
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86
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87 function Get_Page_Size return int is
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88 begin
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89 return int (sysconf (SC_PAGESIZE));
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90 end Get_Page_Size;
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91
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92 -----------------
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93 -- To_Duration --
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94 -----------------
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95
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96 function To_Duration (TS : timespec) return Duration is
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97 begin
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98 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
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99 end To_Duration;
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100
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101 ------------------------
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102 -- To_Target_Priority --
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103 ------------------------
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104
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105 function To_Target_Priority
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106 (Prio : System.Any_Priority) return Interfaces.C.int
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107 is
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108 begin
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109 return Interfaces.C.int (Prio);
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110 end To_Target_Priority;
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111
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112 -----------------
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113 -- To_Timespec --
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114 -----------------
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115
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116 function To_Timespec (D : Duration) return timespec is
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117 S : time_t;
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118 F : Duration;
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119
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120 begin
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121 S := time_t (Long_Long_Integer (D));
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122 F := D - Duration (S);
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123
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124 -- If F is negative due to a round-up, adjust for positive F value
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125
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126 if F < 0.0 then
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127 S := S - 1;
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128 F := F + 1.0;
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129 end if;
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130
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131 return timespec'(tv_sec => S,
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132 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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133 end To_Timespec;
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134
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135 -------------
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136 -- sigwait --
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137 -------------
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138
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139 function sigwait
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140 (set : access sigset_t;
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141 sig : access Signal)
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142 return int
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143 is
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144 function sigwaitinfo
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145 (set : access sigset_t;
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146 info : System.Address) return Signal;
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147 pragma Import (C, sigwaitinfo, "sigwaitinfo");
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148
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149 begin
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150 sig.all := sigwaitinfo (set, Null_Address);
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151
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152 if sig.all = -1 then
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153 return errno;
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154 end if;
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155
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156 return 0;
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157 end sigwait;
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158
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159 --------------------
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160 -- Get_Stack_Base --
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161 --------------------
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162
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163 function Get_Stack_Base (thread : pthread_t) return Address is
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164 pragma Warnings (Off, thread);
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165 begin
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166 return Null_Address;
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167 end Get_Stack_Base;
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168
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169 ------------------
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170 -- pthread_init --
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171 ------------------
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172
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173 procedure pthread_init is
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174 begin
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175 null;
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176 end pthread_init;
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177
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178 end System.OS_Interface;
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