1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ P R I M I T I V E S --
11 -- Copyright (C) 1998-2001 Free Software Foundation, Inc. --
13 -- GNARL is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNARL; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNARL was developed by the GNARL team at Florida State University. It is --
32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
33 -- State University (http://www.gnat.com). --
35 ------------------------------------------------------------------------------
37 -- This version is for POSIX-like operating systems
39 package body System.OS_Primitives is
41 -- ??? These definitions are duplicated from System.OS_Interface
42 -- because we don't want to depend on any package. Consider removing
43 -- these declarations in System.OS_Interface and move these ones in
46 type struct_timezone is record
47 tz_minuteswest : Integer;
50 pragma Convention (C, struct_timezone);
51 type struct_timezone_ptr is access all struct_timezone;
53 type time_t is new Integer;
55 type struct_timeval is record
59 pragma Convention (C, struct_timeval);
62 (tv : access struct_timeval;
63 tz : struct_timezone_ptr) return Integer;
64 pragma Import (C, gettimeofday, "gettimeofday");
66 type timespec is record
68 tv_nsec : Long_Integer;
70 pragma Convention (C, timespec);
72 function nanosleep (rqtp, rmtp : access timespec) return Integer;
73 pragma Import (C, nanosleep, "nanosleep");
79 function Clock return Duration is
80 TV : aliased struct_timeval;
84 Result := gettimeofday (TV'Access, null);
85 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
92 function Monotonic_Clock return Duration renames Clock;
98 function To_Timespec (D : Duration) return timespec;
100 function To_Timespec (D : Duration) return timespec is
105 S := time_t (Long_Long_Integer (D));
106 F := D - Duration (S);
108 -- If F has negative value due to a round-up, adjust for positive F
116 return timespec' (tv_sec => S,
117 tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
124 procedure Timed_Delay
128 Request : aliased timespec;
129 Remaind : aliased timespec;
133 Check_Time : Duration := Clock;
135 if Mode = Relative then
137 Abs_Time := Time + Check_Time;
139 Rel_Time := Time - Check_Time;
143 if Rel_Time > 0.0 then
145 Request := To_Timespec (Rel_Time);
146 Result := nanosleep (Request'Access, Remaind'Access);
149 exit when Abs_Time <= Check_Time;
151 Rel_Time := Abs_Time - Check_Time;
156 end System.OS_Primitives;