| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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-like operating systems |
| |
| with System.Parameters; |
| package body System.OS_Primitives is |
| |
| -- ??? 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 in |
| -- 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 |
| |
| type timeval is record |
| tv_sec : time_t; |
| tv_usec : Long_Integer; |
| end record; |
| pragma Convention (C, timeval); |
| |
| procedure timeval_to_duration |
| (T : not null access timeval; |
| sec : not null access Long_Long_Integer; |
| usec : not null access Long_Integer); |
| pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration"); |
| |
| Micro : constant := 10**6; |
| sec : aliased Long_Long_Integer; |
| usec : aliased Long_Integer; |
| TV : aliased timeval; |
| Result : Integer; |
| pragma Unreferenced (Result); |
| |
| function gettimeofday |
| (Tv : access timeval; |
| Tz : System.Address := System.Null_Address) return Integer; |
| pragma Import (C, gettimeofday, "gettimeofday"); |
| |
| begin |
| -- The return codes for gettimeofday are as follows (from man pages): |
| -- EPERM settimeofday is called by someone other than the superuser |
| -- EINVAL Timezone (or something else) is invalid |
| -- EFAULT One of tv or tz pointed outside accessible address space |
| |
| -- None of these codes signal a potential clock skew, hence the return |
| -- value is never checked. |
| |
| Result := gettimeofday (TV'Access, System.Null_Address); |
| timeval_to_duration (TV'Access, sec'Access, usec'Access); |
| return Duration (sec) + Duration (usec) / Micro; |
| 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 |
| Request : aliased timespec; |
| Remaind : aliased timespec; |
| Rel_Time : Duration; |
| Abs_Time : Duration; |
| Base_Time : constant Duration := Clock; |
| Check_Time : Duration := Base_Time; |
| |
| Result : Integer; |
| pragma Unreferenced (Result); |
| |
| begin |
| if Mode = Relative then |
| Rel_Time := Time; |
| Abs_Time := Time + Check_Time; |
| else |
| Rel_Time := Time - Check_Time; |
| Abs_Time := Time; |
| end if; |
| |
| if Rel_Time > 0.0 then |
| loop |
| Request := To_Timespec (Rel_Time); |
| Result := nanosleep (Request'Access, Remaind'Access); |
| Check_Time := Clock; |
| |
| exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; |
| |
| Rel_Time := Abs_Time - Check_Time; |
| end loop; |
| end if; |
| end Timed_Delay; |
| |
| ---------------- |
| -- Initialize -- |
| ---------------- |
| |
| procedure Initialize is |
| begin |
| null; |
| end Initialize; |
| |
| end System.OS_Primitives; |
