From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/ada/s-osprim-mingw.adb | 342 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 342 insertions(+) create mode 100644 gcc/ada/s-osprim-mingw.adb (limited to 'gcc/ada/s-osprim-mingw.adb') diff --git a/gcc/ada/s-osprim-mingw.adb b/gcc/ada/s-osprim-mingw.adb new file mode 100644 index 000000000..6c05b524f --- /dev/null +++ b/gcc/ada/s-osprim-mingw.adb @@ -0,0 +1,342 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 1998-2009, 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 -- +-- . -- +-- -- +-- GNARL was developed by the GNARL team at Florida State University. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This is the NT version of this package + +with System.Win32.Ext; + +package body System.OS_Primitives is + + use System.Win32; + use System.Win32.Ext; + + ---------------------------------------- + -- Data for the high resolution clock -- + ---------------------------------------- + + -- Declare some pointers to access multi-word data above. This is needed + -- to workaround a limitation in the GNU/Linker auto-import feature used + -- to build the GNAT runtime DLLs. In fact the Clock and Monotonic_Clock + -- routines are inlined and they are using some multi-word variables. + -- GNU/Linker will fail to auto-import those variables when building + -- libgnarl.dll. The indirection level introduced here has no measurable + -- penalties. + + -- Note that access variables below must not be declared as constant + -- otherwise the compiler optimization will remove this indirect access. + + type DA is access all Duration; + -- Use to have indirect access to multi-word variables + + type LIA is access all LARGE_INTEGER; + -- Use to have indirect access to multi-word variables + + type LLIA is access all Long_Long_Integer; + -- Use to have indirect access to multi-word variables + + Tick_Frequency : aliased LARGE_INTEGER; + TFA : constant LIA := Tick_Frequency'Access; + -- Holds frequency of high-performance counter used by Clock + -- Windows NT uses a 1_193_182 Hz counter on PCs. + + Base_Ticks : aliased LARGE_INTEGER; + BTA : constant LIA := Base_Ticks'Access; + -- Holds the Tick count for the base time + + Base_Monotonic_Ticks : aliased LARGE_INTEGER; + BMTA : constant LIA := Base_Monotonic_Ticks'Access; + -- Holds the Tick count for the base monotonic time + + Base_Clock : aliased Duration; + BCA : constant DA := Base_Clock'Access; + -- Holds the current clock for the standard clock's base time + + Base_Monotonic_Clock : aliased Duration; + BMCA : constant DA := Base_Monotonic_Clock'Access; + -- Holds the current clock for monotonic clock's base time + + Base_Time : aliased Long_Long_Integer; + BTiA : constant LLIA := Base_Time'Access; + -- Holds the base time used to check for system time change, used with + -- the standard clock. + + procedure Get_Base_Time; + -- Retrieve the base time and base ticks. These values will be used by + -- clock to compute the current time by adding to it a fraction of the + -- performance counter. This is for the implementation of a + -- high-resolution clock. Note that this routine does not change the base + -- monotonic values used by the monotonic clock. + + ----------- + -- Clock -- + ----------- + + -- This implementation of clock provides high resolution timer values + -- using QueryPerformanceCounter. This call return a 64 bits values (based + -- on the 8253 16 bits counter). This counter is updated every 1/1_193_182 + -- times per seconds. The call to QueryPerformanceCounter takes 6 + -- microsecs to complete. + + function Clock return Duration is + Max_Shift : constant Duration := 2.0; + Hundreds_Nano_In_Sec : constant Long_Long_Float := 1.0E7; + Current_Ticks : aliased LARGE_INTEGER; + Elap_Secs_Tick : Duration; + Elap_Secs_Sys : Duration; + Now : aliased Long_Long_Integer; + + begin + if QueryPerformanceCounter (Current_Ticks'Access) = Win32.FALSE then + return 0.0; + end if; + + GetSystemTimeAsFileTime (Now'Access); + + Elap_Secs_Sys := + Duration (Long_Long_Float (abs (Now - BTiA.all)) / + Hundreds_Nano_In_Sec); + + Elap_Secs_Tick := + Duration (Long_Long_Float (Current_Ticks - BTA.all) / + Long_Long_Float (TFA.all)); + + -- If we have a shift of more than Max_Shift seconds we resynchronize + -- the Clock. This is probably due to a manual Clock adjustment, an + -- DST adjustment or an NTP synchronisation. And we want to adjust the + -- time for this system (non-monotonic) clock. + + if abs (Elap_Secs_Sys - Elap_Secs_Tick) > Max_Shift then + Get_Base_Time; + + Elap_Secs_Tick := + Duration (Long_Long_Float (Current_Ticks - BTA.all) / + Long_Long_Float (TFA.all)); + end if; + + return BCA.all + Elap_Secs_Tick; + end Clock; + + ------------------- + -- Get_Base_Time -- + ------------------- + + procedure Get_Base_Time is + + -- The resolution for GetSystemTime is 1 millisecond + + -- The time to get both base times should take less than 1 millisecond. + -- Therefore, the elapsed time reported by GetSystemTime between both + -- actions should be null. + + epoch_1970 : constant := 16#19D_B1DE_D53E_8000#; -- win32 UTC epoch + system_time_ns : constant := 100; -- 100 ns per tick + Sec_Unit : constant := 10#1#E9; + Max_Elapsed : constant LARGE_INTEGER := + LARGE_INTEGER (Tick_Frequency / 100_000); + -- Look for a precision of 0.01 ms + + Loc_Ticks, Ctrl_Ticks : aliased LARGE_INTEGER; + Loc_Time, Ctrl_Time : aliased Long_Long_Integer; + Elapsed : LARGE_INTEGER; + Current_Max : LARGE_INTEGER := LARGE_INTEGER'Last; + + begin + -- Here we must be sure that both of these calls are done in a short + -- amount of time. Both are base time and should in theory be taken + -- at the very same time. + + -- The goal of the following loop is to synchronize the system time + -- with the Win32 performance counter by getting a base offset for both. + -- Using these offsets it is then possible to compute actual time using + -- a performance counter which has a better precision than the Win32 + -- time API. + + -- Try at most 10th times to reach the best synchronisation (below 1 + -- millisecond) otherwise the runtime will use the best value reached + -- during the runs. + + for K in 1 .. 10 loop + if QueryPerformanceCounter (Loc_Ticks'Access) = Win32.FALSE then + pragma Assert + (Standard.False, + "Could not query high performance counter in Clock"); + null; + end if; + + GetSystemTimeAsFileTime (Ctrl_Time'Access); + + -- Scan for clock tick, will take up to 16ms/1ms depending on PC. + -- This cannot be an infinite loop or the system hardware is badly + -- damaged. + + loop + GetSystemTimeAsFileTime (Loc_Time'Access); + + if QueryPerformanceCounter (Ctrl_Ticks'Access) = Win32.FALSE then + pragma Assert + (Standard.False, + "Could not query high performance counter in Clock"); + null; + end if; + + exit when Loc_Time /= Ctrl_Time; + Loc_Ticks := Ctrl_Ticks; + end loop; + + -- Check elapsed Performance Counter between samples + -- to choose the best one. + + Elapsed := Ctrl_Ticks - Loc_Ticks; + + if Elapsed < Current_Max then + Base_Time := Loc_Time; + Base_Ticks := Loc_Ticks; + Current_Max := Elapsed; + + -- Exit the loop when we have reached the expected precision + + exit when Elapsed <= Max_Elapsed; + end if; + end loop; + + Base_Clock := Duration + (Long_Long_Float ((Base_Time - epoch_1970) * system_time_ns) / + Long_Long_Float (Sec_Unit)); + end Get_Base_Time; + + --------------------- + -- Monotonic_Clock -- + --------------------- + + function Monotonic_Clock return Duration is + Current_Ticks : aliased LARGE_INTEGER; + Elap_Secs_Tick : Duration; + begin + if QueryPerformanceCounter (Current_Ticks'Access) = Win32.FALSE then + return 0.0; + else + Elap_Secs_Tick := + Duration (Long_Long_Float (Current_Ticks - BMTA.all) / + Long_Long_Float (TFA.all)); + return BMCA.all + Elap_Secs_Tick; + end if; + end Monotonic_Clock; + + ----------------- + -- Timed_Delay -- + ----------------- + + procedure Timed_Delay (Time : Duration; Mode : Integer) is + + function Mode_Clock return Duration; + pragma Inline (Mode_Clock); + -- Return the current clock value using either the monotonic clock or + -- standard clock depending on the Mode value. + + ---------------- + -- Mode_Clock -- + ---------------- + + function Mode_Clock return Duration is + begin + case Mode is + when Absolute_RT => + return Monotonic_Clock; + when others => + return Clock; + end case; + end Mode_Clock; + + -- Local Variables + + Base_Time : constant Duration := Mode_Clock; + -- Base_Time is used to detect clock set backward, in this case we + -- cannot ensure the delay accuracy. + + Rel_Time : Duration; + Abs_Time : Duration; + Check_Time : Duration := Base_Time; + + -- Start of processing for Timed Delay + + 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 + Sleep (DWORD (Rel_Time * 1000.0)); + Check_Time := Mode_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 -- + ---------------- + + Initialized : Boolean := False; + + procedure Initialize is + begin + if Initialized then + return; + end if; + + Initialized := True; + + -- Get starting time as base + + if QueryPerformanceFrequency (Tick_Frequency'Access) = Win32.FALSE then + raise Program_Error with + "cannot get high performance counter frequency"; + end if; + + Get_Base_Time; + + -- Keep base clock and ticks for the monotonic clock. These values + -- should never be changed to ensure proper behavior of the monotonic + -- clock. + + Base_Monotonic_Clock := Base_Clock; + Base_Monotonic_Ticks := Base_Ticks; + end Initialize; + +end System.OS_Primitives; -- cgit v1.2.3