diff options
Diffstat (limited to 'gcc/ada/5wosprim.adb')
| -rw-r--r-- | gcc/ada/5wosprim.adb | 119 |
1 files changed, 90 insertions, 29 deletions
diff --git a/gcc/ada/5wosprim.adb b/gcc/ada/5wosprim.adb index 4ceee490e6e..5ec73987a72 100644 --- a/gcc/ada/5wosprim.adb +++ b/gcc/ada/5wosprim.adb @@ -6,7 +6,7 @@ -- -- -- B o d y -- -- -- --- Copyright (C) 1998-2001 Free Software Foundation, Inc. -- +-- 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- -- @@ -27,45 +27,103 @@ -- 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. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ -- This is the NT version of this package with Ada.Exceptions; -with System.OS_Interface; +with Interfaces.C; package body System.OS_Primitives is - use System.OS_Interface; + --------------------------- + -- Win32 API Definitions -- + --------------------------- - --------------------------------------- - -- Data for the high resolution clock -- - --------------------------------------- + -- These definitions are copied from System.OS_Interface because we do not + -- want to depend on gnarl here. + + type DWORD is new Interfaces.C.unsigned_long; + + type LARGE_INTEGER is delta 1.0 range -2.0**63 .. 2.0**63 - 1.0; + + type BOOL is new Boolean; + for BOOL'Size use Interfaces.C.unsigned_long'Size; + + procedure GetSystemTimeAsFileTime (lpFileTime : access Long_Long_Integer); + pragma Import (Stdcall, GetSystemTimeAsFileTime, "GetSystemTimeAsFileTime"); + + function QueryPerformanceCounter + (lpPerformanceCount : access LARGE_INTEGER) return BOOL; + pragma Import + (Stdcall, QueryPerformanceCounter, "QueryPerformanceCounter"); - Tick_Frequency : aliased LARGE_INTEGER; + function QueryPerformanceFrequency + (lpFrequency : access LARGE_INTEGER) return BOOL; + pragma Import + (Stdcall, QueryPerformanceFrequency, "QueryPerformanceFrequency"); + + procedure Sleep (dwMilliseconds : DWORD); + pragma Import (Stdcall, Sleep, External_Name => "Sleep"); + + ---------------------------------------- + -- 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 : 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; + Base_Ticks : aliased LARGE_INTEGER; + BTA : LIA := Base_Ticks'Access; -- Holds the Tick count for the base time. - Base_Clock : Duration; + Base_Monotonic_Ticks : aliased LARGE_INTEGER; + BMTA : LIA := Base_Monotonic_Ticks'Access; + -- Holds the Tick count for the base monotonic time. + + Base_Clock : aliased Duration; + BCA : DA := Base_Clock'Access; -- Holds the current clock for the standard clock's base time - Base_Monotonic_Clock : Duration; + Base_Monotonic_Clock : aliased Duration; + BMCA : DA := Base_Monotonic_Clock'Access; -- Holds the current clock for monotonic clock's base time - Base_Time : aliased Long_Long_Integer; + Base_Time : aliased Long_Long_Integer; + BTiA : 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. This base time will be used by clock to - -- compute the current time by adding to it a fraction of the + -- 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. + -- high-resolution clock. Note that this routine does not change the base + -- monotonic values used by the monotonic clock. ----------- -- Clock -- @@ -78,8 +136,8 @@ package body System.OS_Primitives is -- microsecs to complete. function Clock return Duration is - Max_Shift : constant Duration := 2.0; - Hundreds_Nano_In_Sec : constant := 1E7; + 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; @@ -93,26 +151,27 @@ package body System.OS_Primitives is GetSystemTimeAsFileTime (Now'Access); Elap_Secs_Sys := - Duration (abs (Now - Base_Time) / Hundreds_Nano_In_Sec); + Duration (Long_Long_Float (abs (Now - BTiA.all)) / + Hundreds_Nano_In_Sec); Elap_Secs_Tick := - Duration (Long_Long_Float (Current_Ticks - Base_Ticks) / - Long_Long_Float (Tick_Frequency)); + 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 resynchonize the -- Clock. This is probably due to a manual Clock adjustment, an DST - -- adjustment or an NNTP synchronisation. And we want to adjust the + -- 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 - Base_Ticks) / - Long_Long_Float (Tick_Frequency)); + Duration (Long_Long_Float (Current_Ticks - BTA.all) / + Long_Long_Float (TFA.all)); end if; - return Base_Clock + Elap_Secs_Tick; + return BCA.all + Elap_Secs_Tick; end Clock; ------------------- @@ -120,8 +179,6 @@ package body System.OS_Primitives is ------------------- procedure Get_Base_Time is - use System.OS_Interface; - -- The resolution for GetSystemTime is 1 millisecond. -- The time to get both base times should take less than 1 millisecond. @@ -174,10 +231,10 @@ package body System.OS_Primitives is end if; Elap_Secs_Tick := - Duration (Long_Long_Float (Current_Ticks - Base_Ticks) / - Long_Long_Float (Tick_Frequency)); + Duration (Long_Long_Float (Current_Ticks - BMTA.all) / + Long_Long_Float (TFA.all)); - return Base_Monotonic_Clock + Elap_Secs_Tick; + return BMCA.all + Elap_Secs_Tick; end Monotonic_Clock; ----------------- @@ -221,5 +278,9 @@ begin 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 System.OS_Primitives; |