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Diffstat (limited to 'gcc/ada/libgnat/s-osprim-unix.adb')
| -rw-r--r-- | gcc/ada/libgnat/s-osprim-unix.adb | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/s-osprim-unix.adb b/gcc/ada/libgnat/s-osprim-unix.adb new file mode 100644 index 0000000..f273df6 --- /dev/null +++ b/gcc/ada/libgnat/s-osprim-unix.adb @@ -0,0 +1,126 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 1998-2017, 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 uses gettimeofday and select +-- This file is suitable for OpenNT, Dec Unix and SCO UnixWare. + +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 struct_timeval is record + tv_sec : Integer; + tv_usec : Integer; + end record; + pragma Convention (C, struct_timeval); + + procedure gettimeofday + (tv : not null access struct_timeval; + tz : Address := Null_Address); + pragma Import (C, gettimeofday, "gettimeofday"); + + procedure C_select + (n : Integer := 0; + readfds, + writefds, + exceptfds : Address := Null_Address; + timeout : not null access struct_timeval); + pragma Import (C, C_select, "select"); + + ----------- + -- Clock -- + ----------- + + function Clock return Duration is + TV : aliased struct_timeval; + + begin + gettimeofday (TV'Access); + return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6; + end Clock; + + ----------------- + -- Timed_Delay -- + ----------------- + + procedure Timed_Delay + (Time : Duration; + Mode : Integer) + is + Rel_Time : Duration; + Abs_Time : Duration; + Base_Time : constant Duration := Clock; + Check_Time : Duration := Base_Time; + timeval : aliased struct_timeval; + + 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 + timeval.tv_sec := Integer (Rel_Time); + + if Duration (timeval.tv_sec) > Rel_Time then + timeval.tv_sec := timeval.tv_sec - 1; + end if; + + timeval.tv_usec := + Integer ((Rel_Time - Duration (timeval.tv_sec)) * 10#1#E6); + + C_select (timeout => timeval'Unchecked_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; |