diff options
Diffstat (limited to 'gcc-4.8/gcc/ada/s-osprim-mingw.adb')
-rw-r--r-- | gcc-4.8/gcc/ada/s-osprim-mingw.adb | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/gcc-4.8/gcc/ada/s-osprim-mingw.adb b/gcc-4.8/gcc/ada/s-osprim-mingw.adb deleted file mode 100644 index 874b1cb18..000000000 --- a/gcc-4.8/gcc/ada/s-osprim-mingw.adb +++ /dev/null @@ -1,404 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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) 1998-2013, 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 is the NT version of this package - -with System.Task_Lock; -with System.Win32.Ext; - -package body System.OS_Primitives is - - use System.Task_Lock; - use System.Win32; - use System.Win32.Ext; - - ---------------------------------------- - -- Data for the high resolution clock -- - ---------------------------------------- - - Tick_Frequency : aliased LARGE_INTEGER; - -- Holds frequency of high-performance counter used by Clock - -- Windows NT uses a 1_193_182 Hz counter on PCs. - - Base_Monotonic_Ticks : LARGE_INTEGER; - -- Holds the Tick count for the base monotonic time - - Base_Monotonic_Clock : Duration; - -- Holds the current clock for monotonic clock's base time - - type Clock_Data is record - Base_Ticks : LARGE_INTEGER; - -- Holds the Tick count for the base time - - Base_Time : Long_Long_Integer; - -- Holds the base time used to check for system time change, used with - -- the standard clock. - - Base_Clock : Duration; - -- Holds the current clock for the standard clock's base time - end record; - - type Clock_Data_Access is access all Clock_Data; - - -- Two base clock buffers. This is used to be able to update a buffer - -- while the other buffer is read. The point is that we do not want to - -- use a lock inside the Clock routine for performance reasons. We still - -- use a lock in the Get_Base_Time which is called very rarely. Current - -- is a pointer, the pragma Atomic is there to ensure that the value can - -- be set or read atomically. That's it, when Get_Base_Time has updated - -- a buffer the switch to the new value is done by changing Current - -- pointer. - - First, Second : aliased Clock_Data; - Current : Clock_Data_Access := First'Access; - pragma Atomic (Current); - - -- The following signature is to detect change on the base clock data - -- above. The signature is a modular type, it will wrap around without - -- raising an exception. We would need to have exactly 2**32 updates of - -- the base data for the changes to get undetected. - - type Signature_Type is mod 2**32; - Signature : Signature_Type := 0; - pragma Atomic (Signature); - - procedure Get_Base_Time (Data : out Clock_Data); - -- 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; - Data : Clock_Data; - Current_Ticks : aliased LARGE_INTEGER; - Elap_Secs_Tick : Duration; - Elap_Secs_Sys : Duration; - Now : aliased Long_Long_Integer; - Sig1, Sig2 : Signature_Type; - - begin - -- Try ten times to get a coherent set of base data. For this we just - -- check that the signature hasn't changed during the copy of the - -- current data. - -- - -- This loop will always be done once if there is no interleaved call - -- to Get_Base_Time. - - for K in 1 .. 10 loop - Sig1 := Signature; - Data := Current.all; - Sig2 := Signature; - exit when Sig1 = Sig2; - end loop; - - 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 - Data.Base_Time)) / - Hundreds_Nano_In_Sec); - - Elap_Secs_Tick := - Duration (Long_Long_Float (Current_Ticks - Data.Base_Ticks) / - Long_Long_Float (Tick_Frequency)); - - -- If we have a shift of more than Max_Shift seconds we resynchronize - -- the Clock. This is probably due to a manual Clock adjustment, a 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 (Data); - - Elap_Secs_Tick := - Duration (Long_Long_Float (Current_Ticks - Data.Base_Ticks) / - Long_Long_Float (Tick_Frequency)); - end if; - - return Data.Base_Clock + Elap_Secs_Tick; - end Clock; - - ------------------- - -- Get_Base_Time -- - ------------------- - - procedure Get_Base_Time (Data : out Clock_Data) 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 - Sig : constant Signature_Type := Signature; - - 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; - New_Data : Clock_Data_Access; - - 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 10 times to reach the best synchronisation (below 1 - -- millisecond) otherwise the runtime will use the best value reached - -- during the runs. - - Lock; - - -- First check that the current value has not been updated. This - -- could happen if another task has called Clock at the same time - -- and that Max_Shift has been reached too. - -- - -- But if the current value has been changed just before we entered - -- into the critical section, we can safely return as the current - -- base data (time, clock, ticks) have already been updated. - - if Sig /= Signature then - return; - end if; - - -- Check for the unused data buffer and set New_Data to point to it - - if Current = First'Access then - New_Data := Second'Access; - else - New_Data := First'Access; - end if; - - 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 - New_Data.Base_Time := Loc_Time; - New_Data.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; - - New_Data.Base_Clock := Duration - (Long_Long_Float ((New_Data.Base_Time - epoch_1970) * system_time_ns) / - Long_Long_Float (Sec_Unit)); - - -- At this point all the base values have been set into the new data - -- record. We just change the pointer (atomic operation) to this new - -- values. - - Current := New_Data; - Data := New_Data.all; - - -- Set new signature for this data set - - Signature := Signature + 1; - - Unlock; - - exception - when others => - Unlock; - raise; - 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 - Base_Monotonic_Ticks) / - Long_Long_Float (Tick_Frequency)); - return Base_Monotonic_Clock + 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 (Current.all); - - -- 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 := Current.Base_Clock; - Base_Monotonic_Ticks := Current.Base_Ticks; - end Initialize; - -end System.OS_Primitives; |