1 ------------------------------------------------------------------------------
3 -- GNAT 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) 1991-2017, Florida State University --
10 -- Copyright (C) 1995-2017, AdaCore --
12 -- GNAT 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 3, or (at your option) any later ver- --
15 -- sion. GNAT 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. --
19 -- As a special exception under Section 7 of GPL version 3, you are granted --
20 -- additional permissions described in the GCC Runtime Library Exception, --
21 -- version 3.1, as published by the Free Software Foundation. --
23 -- You should have received a copy of the GNU General Public License and --
24 -- a copy of the GCC Runtime Library Exception along with this program; --
25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
26 -- <http://www.gnu.org/licenses/>. --
28 -- GNARL was developed by the GNARL team at Florida State University. --
29 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
31 ------------------------------------------------------------------------------
33 -- This version is for POSIX-like operating systems
36 -- Turn off polling, we do not want ATC polling to take place during
37 -- tasking operations. It causes infinite loops and other problems.
39 -- This package encapsulates all direct interfaces to OS services
40 -- that are needed by children of System.
42 with Interfaces.C; use Interfaces.C;
43 package body System.OS_Interface is
49 function Get_Stack_Base (thread : pthread_t) return Address is
50 pragma Warnings (Off, thread);
60 procedure pthread_init is
69 function To_Duration (TS : timespec) return Duration is
71 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
74 ------------------------
75 -- To_Target_Priority --
76 ------------------------
78 function To_Target_Priority
79 (Prio : System.Any_Priority) return Interfaces.C.int
82 return Interfaces.C.int (Prio);
83 end To_Target_Priority;
89 function To_Timespec (D : Duration) return timespec is
94 S := time_t (Long_Long_Integer (D));
95 F := D - Duration (S);
97 -- If F has negative value due to a round-up, adjust for positive F
105 return timespec'(tv_sec => S,
106 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
109 end System.OS_Interface;