1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ P R I M I T I V E S --
9 -- Copyright (C) 1998-2007, Free Software Foundation, Inc. --
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 2, or (at your option) any later ver- --
14 -- sion. GNARL 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This version is for POSIX-like operating systems
36 package body System.OS_Primitives is
38 -- ??? These definitions are duplicated from System.OS_Interface
39 -- because we don't want to depend on any package. Consider removing
40 -- these declarations in System.OS_Interface and move these ones in
43 type struct_timezone is record
44 tz_minuteswest : Integer;
47 pragma Convention (C, struct_timezone);
48 type struct_timezone_ptr is access all struct_timezone;
50 type time_t is new Long_Integer;
52 type struct_timeval is record
54 tv_usec : Long_Integer;
56 pragma Convention (C, struct_timeval);
59 (tv : not null access struct_timeval;
60 tz : struct_timezone_ptr) return Integer;
61 pragma Import (C, gettimeofday, "gettimeofday");
63 type timespec is record
65 tv_nsec : Long_Integer;
67 pragma Convention (C, timespec);
69 function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
70 pragma Import (C, nanosleep, "nanosleep");
76 function Clock return Duration is
77 TV : aliased struct_timeval;
80 pragma Unreferenced (Result);
83 Result := gettimeofday (TV'Access, null);
84 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
91 function Monotonic_Clock return Duration renames Clock;
97 function To_Timespec (D : Duration) return timespec;
99 function To_Timespec (D : Duration) return timespec is
104 S := time_t (Long_Long_Integer (D));
105 F := D - Duration (S);
107 -- If F has negative value due to a round-up, adjust for positive F
116 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;
132 Base_Time : constant Duration := Clock;
133 Check_Time : Duration := Base_Time;
136 pragma Unreferenced (Result);
139 if Mode = Relative then
141 Abs_Time := Time + Check_Time;
143 Rel_Time := Time - Check_Time;
147 if Rel_Time > 0.0 then
149 Request := To_Timespec (Rel_Time);
150 Result := nanosleep (Request'Access, Remaind'Access);
153 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
155 Rel_Time := Abs_Time - Check_Time;
164 procedure Initialize is
169 end System.OS_Primitives;