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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ P R I M I T I V E S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1998-2021, Free Software Foundation, Inc. --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This version is for POSIX.1-2008-like operating systems
with System.CRTL;
with System.OS_Constants;
with System.Parameters;
package body System.OS_Primitives is
subtype int is System.CRTL.int;
-- ??? These definitions are duplicated from System.OS_Interface because
-- we don't want to depend on any package. Consider removing these
-- declarations in System.OS_Interface and move these ones to the spec.
type time_t is range -2 ** (System.Parameters.time_t_bits - 1)
.. 2 ** (System.Parameters.time_t_bits - 1) - 1;
type timespec is record
tv_sec : time_t;
tv_nsec : Long_Integer;
end record;
pragma Convention (C, timespec);
function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
pragma Import (C, nanosleep, "nanosleep");
-----------
-- Clock --
-----------
function Clock return Duration is
TS : aliased timespec;
Result : int;
type clockid_t is new int;
CLOCK_REALTIME : constant clockid_t :=
System.OS_Constants.CLOCK_REALTIME;
function clock_gettime
(clock_id : clockid_t;
tp : access timespec) return int;
pragma Import (C, clock_gettime, "clock_gettime");
begin
Result := clock_gettime (CLOCK_REALTIME, TS'Unchecked_Access);
pragma Assert (Result = 0);
return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
end Clock;
-----------------
-- To_Timespec --
-----------------
function To_Timespec (D : Duration) return timespec;
function To_Timespec (D : Duration) return timespec is
S : time_t;
F : Duration;
begin
S := time_t (Long_Long_Integer (D));
F := D - Duration (S);
-- If F has negative value due to a round-up, adjust for positive F
-- value.
if F < 0.0 then
S := S - 1;
F := F + 1.0;
end if;
return
timespec'(tv_sec => S,
tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
end To_Timespec;
-----------------
-- Timed_Delay --
-----------------
procedure Timed_Delay
(Time : Duration;
Mode : Integer)
is separate;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
null;
end Initialize;
end System.OS_Primitives;