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Diffstat (limited to 'gcc/ada/s-osinte-os2.adb')
| -rw-r--r-- | gcc/ada/s-osinte-os2.adb | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/gcc/ada/s-osinte-os2.adb b/gcc/ada/s-osinte-os2.adb new file mode 100644 index 00000000000..e2a241118d5 --- /dev/null +++ b/gcc/ada/s-osinte-os2.adb @@ -0,0 +1,120 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- S Y S T E M . O S _ I N T E R F A C E -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1991-1994, Florida State University -- +-- Copyright (C) 1995-2003, Ada Core Technologies -- +-- -- +-- 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 is the OS/2 version of this package + +pragma Polling (Off); +-- Turn off polling, we do not want ATC polling to take place during +-- tasking operations. It causes infinite loops and other problems. + +with Interfaces.OS2Lib.Errors; +with Interfaces.OS2Lib.Synchronization; + +package body System.OS_Interface is + + use Interfaces; + use Interfaces.OS2Lib; + use Interfaces.OS2Lib.Synchronization; + use Interfaces.OS2Lib.Errors; + + ----------- + -- Yield -- + ----------- + + -- Give up the remainder of the time-slice and yield the processor + -- to other threads of equal priority. Yield will return immediately + -- without giving up the current time-slice when the only threads + -- that are ready have a lower priority. + + -- ??? Just giving up the current time-slice seems not to be enough + -- to get the thread to the end of the ready queue if OS/2 does use + -- a queue at all. As a partial work-around, we give up two time-slices. + + -- This is the best we can do now, and at least is sufficient for passing + -- the ACVC 2.0.1 Annex D tests. + + procedure Yield is + begin + Delay_For (0); + Delay_For (0); + end Yield; + + --------------- + -- Delay_For -- + --------------- + + procedure Delay_For (Period : in Duration_In_Millisec) is + Result : APIRET; + + begin + pragma Assert (Period >= 0, "GNULLI---Delay_For: negative argument"); + + -- ??? DosSleep is not the appropriate function for a delay in real + -- time. It only gives up some number of scheduled time-slices. + -- Use a timer instead or block for some semaphore with a time-out. + Result := DosSleep (ULONG (Period)); + + if Result = ERROR_TS_WAKEUP then + + -- Do appropriate processing for interrupted sleep + -- Can we raise an exception here? + + null; + end if; + + pragma Assert (Result = NO_ERROR, "GNULLI---Error in Delay_For"); + end Delay_For; + + ----------- + -- Clock -- + ----------- + + function Clock return Duration is + + -- Implement conversion from tick count to Duration + -- using fixed point arithmetic. The frequency of + -- the Intel 8254 timer chip is 18.2 * 2**16 Hz. + + Tick_Duration : constant := 1.0 / (18.2 * 2**16); + Tick_Count : aliased QWORD; + + begin + -- Read nr of clock ticks since boot time + + Must_Not_Fail (DosTmrQueryTime (Tick_Count'Access)); + + return Tick_Count * Tick_Duration; + end Clock; + +end System.OS_Interface; |