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) 1998-2009, 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 POSIX-like operating systems
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 time_t is new Long_Integer;
43 type timespec is record
45 tv_nsec : Long_Integer;
47 pragma Convention (C, timespec);
49 function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
50 pragma Import (C, nanosleep, "nanosleep");
56 function Clock return Duration is
57 type timeval is array (1 .. 2) of Long_Integer;
59 procedure timeval_to_duration
60 (T : not null access timeval;
61 sec : not null access Long_Integer;
62 usec : not null access Long_Integer);
63 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
65 Micro : constant := 10**6;
66 sec : aliased Long_Integer;
67 usec : aliased Long_Integer;
70 pragma Unreferenced (Result);
74 Tz : System.Address := System.Null_Address) return Integer;
75 pragma Import (C, gettimeofday, "gettimeofday");
78 -- The return codes for gettimeofday are as follows (from man pages):
79 -- EPERM settimeofday is called by someone other than the superuser
80 -- EINVAL Timezone (or something else) is invalid
81 -- EFAULT One of tv or tz pointed outside accessible address space
83 -- None of these codes signal a potential clock skew, hence the return
84 -- value is never checked.
86 Result := gettimeofday (TV'Access, System.Null_Address);
87 timeval_to_duration (TV'Access, sec'Access, usec'Access);
88 return Duration (sec) + Duration (usec) / Micro;
95 function Monotonic_Clock return Duration renames Clock;
101 function To_Timespec (D : Duration) return timespec;
103 function To_Timespec (D : Duration) return timespec is
108 S := time_t (Long_Long_Integer (D));
109 F := D - Duration (S);
111 -- If F has negative value due to a round-up, adjust for positive F
120 timespec'(tv_sec => S,
121 tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
128 procedure Timed_Delay
132 Request : aliased timespec;
133 Remaind : aliased timespec;
136 Base_Time : constant Duration := Clock;
137 Check_Time : Duration := Base_Time;
140 pragma Unreferenced (Result);
143 if Mode = Relative then
145 Abs_Time := Time + Check_Time;
147 Rel_Time := Time - Check_Time;
151 if Rel_Time > 0.0 then
153 Request := To_Timespec (Rel_Time);
154 Result := nanosleep (Request'Access, Remaind'Access);
157 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
159 Rel_Time := Abs_Time - Check_Time;
168 procedure Initialize is
173 end System.OS_Primitives;