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) 1998-2008, 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 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. --
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. --
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/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 -- This version is for darwin
34 package body System.OS_Primitives is
36 -- ??? These definitions are duplicated from System.OS_Interface
37 -- because we don't want to depend on any package. Consider removing
38 -- these declarations in System.OS_Interface and move these ones in
41 type struct_timezone is record
42 tz_minuteswest : Integer;
45 pragma Convention (C, struct_timezone);
46 type struct_timezone_ptr is access all struct_timezone;
48 type time_t is new Long_Integer;
50 type struct_timeval is record
54 pragma Convention (C, struct_timeval);
57 (tv : not null access struct_timeval;
58 tz : struct_timezone_ptr) return Integer;
59 pragma Import (C, gettimeofday, "gettimeofday");
61 type timespec is record
63 tv_nsec : Long_Integer;
65 pragma Convention (C, timespec);
67 function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
68 pragma Import (C, nanosleep, "nanosleep");
74 function Clock return Duration is
75 TV : aliased struct_timeval;
78 pragma Unreferenced (Result);
81 -- The return codes for gettimeofday are as follows (from man pages):
82 -- EPERM settimeofday is called by someone other than the superuser
83 -- EINVAL Timezone (or something else) is invalid
84 -- EFAULT One of tv or tz pointed outside accessible address space
86 -- None of these codes signal a potential clock skew, hence the return
87 -- value is never checked.
89 Result := gettimeofday (TV'Access, null);
90 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
97 function Monotonic_Clock return Duration renames Clock;
103 function To_Timespec (D : Duration) return timespec;
105 function To_Timespec (D : Duration) return timespec is
110 S := time_t (Long_Long_Integer (D));
111 F := D - Duration (S);
113 -- If F has negative value due to a round-up, adjust for positive F
122 timespec'(tv_sec => S,
123 tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
130 procedure Timed_Delay
134 Request : aliased timespec;
135 Remaind : aliased timespec;
138 Base_Time : constant Duration := Clock;
139 Check_Time : Duration := Base_Time;
142 pragma Unreferenced (Result);
145 if Mode = Relative then
147 Abs_Time := Time + Check_Time;
149 Rel_Time := Time - Check_Time;
153 if Rel_Time > 0.0 then
155 Request := To_Timespec (Rel_Time);
156 Result := nanosleep (Request'Access, Remaind'Access);
159 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
161 Rel_Time := Abs_Time - Check_Time;
170 procedure Initialize is
175 end System.OS_Primitives;