1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ I N T E R F A C E --
9 -- Copyright (C) 1991-2002 Florida State University --
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. --
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. It is --
30 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
31 -- State University (http://www.gnat.com). --
33 -- The GNARL files that were developed for RTEMS are maintained by On-Line --
34 -- Applications Research Corporation (http://www.oarcorp.com) in coopera- --
35 -- tion with Ada Core Technologies Inc. and Florida State University. --
37 ------------------------------------------------------------------------------
39 -- This is the RTEMS version of this package
41 -- This package encapsulates all direct interfaces to OS services
42 -- that are needed by children of System.
45 -- Turn off polling, we do not want ATC polling to take place during
46 -- tasking operations. It causes infinite loops and other problems.
48 with Interfaces.C; use Interfaces.C;
49 package body System.OS_Interface is
55 function To_Duration (TS : timespec) return Duration is
57 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
64 function To_Timespec (D : Duration) return timespec is
68 S := time_t (Long_Long_Integer (D));
69 F := D - Duration (S);
71 -- If F has negative value due to round-up, adjust for positive F value
73 if F < 0.0 then S := S - 1; F := F + 1.0; end if;
74 return timespec'(tv_sec => S,
75 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
78 function To_Duration (TV : struct_timeval) return Duration is
80 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
83 function To_Timeval (D : Duration) return struct_timeval is
87 S := int (Long_Long_Integer (D));
88 F := D - Duration (S);
90 -- If F has negative value due to a round-up, adjust for positive F
92 if F < 0.0 then S := S - 1; F := F + 1.0; end if;
96 tv_usec => int (Long_Long_Integer (F * 10#1#E6)));
99 procedure pthread_init is
104 function Get_Stack_Base (thread : pthread_t) return Address is
105 pragma Warnings (Off, thread);
111 function Get_Page_Size return size_t is
116 function Get_Page_Size return Address is
121 end System.OS_Interface;