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Diffstat (limited to 'gcc/ada/s-osprim-posix.adb')
| -rw-r--r-- | gcc/ada/s-osprim-posix.adb | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/gcc/ada/s-osprim-posix.adb b/gcc/ada/s-osprim-posix.adb new file mode 100644 index 00000000000..c4a7a112380 --- /dev/null +++ b/gcc/ada/s-osprim-posix.adb @@ -0,0 +1,159 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA 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) 1998-2003 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 2, or (at your option) any later ver- -- +-- sion. GNARL 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. See the GNU General Public License -- +-- for more details. You should have received a copy of the GNU General -- +-- Public License distributed with GNARL; see file COPYING. If not, write -- +-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- 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 + +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_timezone is record + tz_minuteswest : Integer; + tz_dsttime : Integer; + end record; + pragma Convention (C, struct_timezone); + type struct_timezone_ptr is access all struct_timezone; + + type time_t is new Long_Integer; + + type struct_timeval is record + tv_sec : time_t; + tv_usec : Long_Integer; + end record; + pragma Convention (C, struct_timeval); + + function gettimeofday + (tv : access struct_timeval; + tz : struct_timezone_ptr) return Integer; + pragma Import (C, gettimeofday, "gettimeofday"); + + type timespec is record + tv_sec : time_t; + tv_nsec : Long_Integer; + end record; + pragma Convention (C, timespec); + + function nanosleep (rqtp, rmtp : access timespec) return Integer; + pragma Import (C, nanosleep, "nanosleep"); + + ----------- + -- Clock -- + ----------- + + function Clock return Duration is + TV : aliased struct_timeval; + + Result : Integer; + pragma Unreferenced (Result); + + begin + Result := gettimeofday (TV'Access, null); + return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6; + end Clock; + + --------------------- + -- Monotonic_Clock -- + --------------------- + + function Monotonic_Clock return Duration renames 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; + Check_Time : Duration := Clock; + + 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; + + Rel_Time := Abs_Time - Check_Time; + end loop; + end if; + end Timed_Delay; + +end System.OS_Primitives; |