1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- 4-- -- 5-- S Y S T E M . O S _ I N T E R F A C E -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 2001-2019, AdaCore -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNARL was developed by the GNARL team at Florida State University. -- 28-- Extensive contributions were provided by Ada Core Technologies, Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- Version of System.OS_Interface for LynxOS-178 (POSIX Threads) 33 34pragma Polling (Off); 35-- Turn off polling, we do not want ATC polling to take place during tasking 36-- operations. It may cause infinite loops and other problems. 37 38package body System.OS_Interface is 39 40 ------------------ 41 -- Current_CPU -- 42 ------------------ 43 44 function Current_CPU return Multiprocessors.CPU is 45 begin 46 -- No multiprocessor support, always return the first CPU Id 47 48 return Multiprocessors.CPU'First; 49 end Current_CPU; 50 51 -------------------- 52 -- Get_Affinity -- 53 -------------------- 54 55 function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range is 56 pragma Unreferenced (Id); 57 58 begin 59 -- No multiprocessor support, always return Not_A_Specific_CPU 60 61 return Multiprocessors.Not_A_Specific_CPU; 62 end Get_Affinity; 63 64 --------------- 65 -- Get_CPU -- 66 --------------- 67 68 function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU is 69 pragma Unreferenced (Id); 70 71 begin 72 -- No multiprocessor support, always return the first CPU Id 73 74 return Multiprocessors.CPU'First; 75 end Get_CPU; 76 77 ------------------- 78 -- Get_Page_Size -- 79 ------------------- 80 81 SC_PAGESIZE : constant := 17; 82 -- C macro to get pagesize value from sysconf 83 84 function sysconf (name : int) return long; 85 pragma Import (C, sysconf, "sysconf"); 86 87 function Get_Page_Size return int is 88 begin 89 return int (sysconf (SC_PAGESIZE)); 90 end Get_Page_Size; 91 92 ----------------- 93 -- To_Duration -- 94 ----------------- 95 96 function To_Duration (TS : timespec) return Duration is 97 begin 98 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9; 99 end To_Duration; 100 101 ------------------------ 102 -- To_Target_Priority -- 103 ------------------------ 104 105 function To_Target_Priority 106 (Prio : System.Any_Priority) return Interfaces.C.int 107 is 108 begin 109 return Interfaces.C.int (Prio); 110 end To_Target_Priority; 111 112 ----------------- 113 -- To_Timespec -- 114 ----------------- 115 116 function To_Timespec (D : Duration) return timespec is 117 S : time_t; 118 F : Duration; 119 120 begin 121 S := time_t (Long_Long_Integer (D)); 122 F := D - Duration (S); 123 124 -- If F is negative due to a round-up, adjust for positive F value 125 126 if F < 0.0 then 127 S := S - 1; 128 F := F + 1.0; 129 end if; 130 131 return timespec'(tv_sec => S, 132 tv_nsec => long (Long_Long_Integer (F * 10#1#E9))); 133 end To_Timespec; 134 135 ------------- 136 -- sigwait -- 137 ------------- 138 139 function sigwait 140 (set : access sigset_t; 141 sig : access Signal) 142 return int 143 is 144 function sigwaitinfo 145 (set : access sigset_t; 146 info : System.Address) return Signal; 147 pragma Import (C, sigwaitinfo, "sigwaitinfo"); 148 149 begin 150 sig.all := sigwaitinfo (set, Null_Address); 151 152 if sig.all = -1 then 153 return errno; 154 end if; 155 156 return 0; 157 end sigwait; 158 159 -------------------- 160 -- Get_Stack_Base -- 161 -------------------- 162 163 function Get_Stack_Base (thread : pthread_t) return Address is 164 pragma Warnings (Off, thread); 165 begin 166 return Null_Address; 167 end Get_Stack_Base; 168 169 ------------------ 170 -- pthread_init -- 171 ------------------ 172 173 procedure pthread_init is 174 begin 175 null; 176 end pthread_init; 177 178end System.OS_Interface; 179