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) 1999-2009, Free Software Foundation, Inc. -- 10-- -- 11-- GNARL 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-- This is a Darwin Threads version of this package 33 34pragma Polling (Off); 35-- Turn off polling, we do not want ATC polling to take place during 36-- tasking operations. It causes infinite loops and other problems. 37 38package body System.OS_Interface is 39 40 use Interfaces.C; 41 42 ----------------- 43 -- To_Duration -- 44 ----------------- 45 46 function To_Duration (TS : timespec) return Duration is 47 begin 48 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9; 49 end To_Duration; 50 51 ------------------------ 52 -- To_Target_Priority -- 53 ------------------------ 54 55 function To_Target_Priority 56 (Prio : System.Any_Priority) return Interfaces.C.int 57 is 58 begin 59 return Interfaces.C.int (Prio); 60 end To_Target_Priority; 61 62 ----------------- 63 -- To_Timespec -- 64 ----------------- 65 66 function To_Timespec (D : Duration) return timespec is 67 S : time_t; 68 F : Duration; 69 70 begin 71 S := time_t (Long_Long_Integer (D)); 72 F := D - Duration (S); 73 74 -- If F has negative value due to a round-up, adjust for positive F 75 -- value. 76 77 if F < 0.0 then 78 S := S - 1; 79 F := F + 1.0; 80 end if; 81 82 return timespec'(tv_sec => S, 83 tv_nsec => long (Long_Long_Integer (F * 10#1#E9))); 84 end To_Timespec; 85 86 ------------------- 87 -- clock_gettime -- 88 ------------------- 89 90 function clock_gettime 91 (clock_id : clockid_t; 92 tp : access timespec) return int 93 is 94 pragma Unreferenced (clock_id); 95 96 -- Darwin Threads don't have clock_gettime, so use gettimeofday 97 98 use Interfaces; 99 100 type timeval is array (1 .. 2) of C.long; 101 102 procedure timeval_to_duration 103 (T : not null access timeval; 104 sec : not null access C.long; 105 usec : not null access C.long); 106 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration"); 107 108 Micro : constant := 10**6; 109 sec : aliased C.long; 110 usec : aliased C.long; 111 TV : aliased timeval; 112 Result : int; 113 114 function gettimeofday 115 (Tv : access timeval; 116 Tz : System.Address := System.Null_Address) return int; 117 pragma Import (C, gettimeofday, "gettimeofday"); 118 119 begin 120 Result := gettimeofday (TV'Access, System.Null_Address); 121 pragma Assert (Result = 0); 122 timeval_to_duration (TV'Access, sec'Access, usec'Access); 123 tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro); 124 return Result; 125 end clock_gettime; 126 127 ----------------- 128 -- sched_yield -- 129 ----------------- 130 131 function sched_yield return int is 132 procedure sched_yield_base (arg : System.Address); 133 pragma Import (C, sched_yield_base, "pthread_yield_np"); 134 135 begin 136 sched_yield_base (System.Null_Address); 137 return 0; 138 end sched_yield; 139 140 -------------- 141 -- lwp_self -- 142 -------------- 143 144 function lwp_self return Address is 145 function pthread_mach_thread_np (thread : pthread_t) return Address; 146 pragma Import (C, pthread_mach_thread_np, "pthread_mach_thread_np"); 147 begin 148 return pthread_mach_thread_np (pthread_self); 149 end lwp_self; 150 151 ------------------ 152 -- pthread_init -- 153 ------------------ 154 155 procedure pthread_init is 156 begin 157 null; 158 end pthread_init; 159 160 ---------------- 161 -- Stack_Base -- 162 ---------------- 163 164 function Get_Stack_Base (thread : pthread_t) return Address is 165 pragma Unreferenced (thread); 166 begin 167 return System.Null_Address; 168 end Get_Stack_Base; 169 170end System.OS_Interface; 171