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 --
10 -- Copyright (C) 1998-2001 Free Software Foundation, Inc. --
12 -- GNARL is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNARL was developed by the GNARL team at Florida State University. It is --
31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
32 -- State University (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 -- This version is for POSIX-like operating systems
38 package body System
.OS_Primitives
is
40 -- ??? These definitions are duplicated from System.OS_Interface
41 -- because we don't want to depend on any package. Consider removing
42 -- these declarations in System.OS_Interface and move these ones in
45 type struct_timezone
is record
46 tz_minuteswest
: Integer;
49 pragma Convention
(C
, struct_timezone
);
50 type struct_timezone_ptr
is access all struct_timezone
;
52 type time_t
is new Integer;
54 type struct_timeval
is record
58 pragma Convention
(C
, struct_timeval
);
61 (tv
: access struct_timeval
;
62 tz
: struct_timezone_ptr
) return Integer;
63 pragma Import
(C
, gettimeofday
, "gettimeofday");
65 type timespec
is record
67 tv_nsec
: Long_Integer;
69 pragma Convention
(C
, timespec
);
71 function nanosleep
(rqtp
, rmtp
: access timespec
) return Integer;
72 pragma Import
(C
, nanosleep
, "nanosleep");
78 function Clock
return Duration is
79 TV
: aliased struct_timeval
;
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
115 return timespec
' (tv_sec => S,
116 tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
123 procedure Timed_Delay
127 Request : aliased timespec;
128 Remaind : aliased timespec;
132 Check_Time : Duration := Clock;
134 if Mode = Relative then
136 Abs_Time := Time + Check_Time;
138 Rel_Time := Time - Check_Time;
142 if Rel_Time > 0.0 then
144 Request := To_Timespec (Rel_Time);
145 Result := nanosleep (Request'Access, Remaind'Access);
148 exit when Abs_Time <= Check_Time;
150 Rel_Time := Abs_Time - Check_Time;
155 end System.OS_Primitives;