1------------------------------------------------------------------------------
2--                                                                          --
3--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
4--                                                                          --
5--                  S Y S T E M . O S _ P R I M I T I V E S                 --
6--                                                                          --
7--                                  B o d y                                 --
8--                                                                          --
9--          Copyright (C) 1998-2003 Free Software Foundation, Inc.          --
10--                                                                          --
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,  59 Temple Place - Suite 330,  Boston, --
20-- MA 02111-1307, USA.                                                      --
21--                                                                          --
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.                                      --
28--                                                                          --
29-- GNARL was developed by the GNARL team at Florida State University.       --
30-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
31--                                                                          --
32------------------------------------------------------------------------------
33
34--  This version uses gettimeofday and select
35--  This file is suitable for Solaris (32 and 64 bits).
36
37package body System.OS_Primitives is
38
39   --  ??? These definitions are duplicated from System.OS_Interface
40   --  because we don't want to depend on any package. Consider removing
41   --  these declarations in System.OS_Interface and move these ones in
42   --  the spec.
43
44   type struct_timeval is record
45      tv_sec  : Long_Integer;
46      tv_usec : Long_Integer;
47   end record;
48   pragma Convention (C, struct_timeval);
49
50   procedure gettimeofday
51     (tv : access struct_timeval;
52      tz : Address := Null_Address);
53   pragma Import (C, gettimeofday, "gettimeofday");
54
55   procedure C_select
56     (n         : Integer := 0;
57      readfds,
58      writefds,
59      exceptfds : Address := Null_Address;
60      timeout   : access struct_timeval);
61   pragma Import (C, C_select, "select");
62
63   -----------
64   -- Clock --
65   -----------
66
67   function Clock return Duration is
68      TV : aliased struct_timeval;
69
70   begin
71      gettimeofday (TV'Access);
72      return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
73   end Clock;
74
75   ---------------------
76   -- Monotonic_Clock --
77   ---------------------
78
79   function Monotonic_Clock return Duration renames Clock;
80
81   -----------------
82   -- Timed_Delay --
83   -----------------
84
85   procedure Timed_Delay
86     (Time : Duration;
87      Mode : Integer)
88   is
89      Rel_Time   : Duration;
90      Abs_Time   : Duration;
91      Check_Time : Duration := Clock;
92      timeval    : aliased struct_timeval;
93
94   begin
95      if Mode = Relative then
96         Rel_Time := Time;
97         Abs_Time := Time + Check_Time;
98      else
99         Rel_Time := Time - Check_Time;
100         Abs_Time := Time;
101      end if;
102
103      if Rel_Time > 0.0 then
104         loop
105            timeval.tv_sec := Long_Integer (Rel_Time);
106
107            if Duration (timeval.tv_sec) > Rel_Time then
108               timeval.tv_sec := timeval.tv_sec - 1;
109            end if;
110
111            timeval.tv_usec :=
112              Long_Integer ((Rel_Time - Duration (timeval.tv_sec)) * 10#1#E6);
113
114            C_select (timeout => timeval'Unchecked_Access);
115            Check_Time := Clock;
116
117            exit when Abs_Time <= Check_Time;
118
119            Rel_Time := Abs_Time - Check_Time;
120         end loop;
121      end if;
122   end Timed_Delay;
123
124end System.OS_Primitives;
125