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Diffstat (limited to 'gcc-4.2.1/gcc/ada/a-caldel.adb')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/a-caldel.adb | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/a-caldel.adb b/gcc-4.2.1/gcc/ada/a-caldel.adb new file mode 100644 index 000000000..84586b82b --- /dev/null +++ b/gcc-4.2.1/gcc/ada/a-caldel.adb @@ -0,0 +1,137 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- A D A . C A L E N D A R . D E L A Y S -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1991-1994, Florida State University -- +-- Copyright (C) 1995-2005, AdaCore -- +-- -- +-- 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, 51 Franklin Street, Fifth Floor, -- +-- Boston, MA 02110-1301, 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. -- +-- -- +------------------------------------------------------------------------------ + +with System.OS_Primitives; +-- Used for Delay_Modes +-- Max_Sensible_Delay + +with System.Soft_Links; +-- Used for Timed_Delay + +with System.Traces; +-- Used for Send_Trace_Info + +with System.Parameters; +-- used for Runtime_Traces + +package body Ada.Calendar.Delays is + + package OSP renames System.OS_Primitives; + package SSL renames System.Soft_Links; + + use type SSL.Timed_Delay_Call; + + use System.Traces; + + -- Earlier, the following operations were implemented using + -- System.Time_Operations. The idea was to avoid sucking in the tasking + -- packages. This did not work. Logically, we can't have it both ways. + -- There is no way to implement time delays that will have correct task + -- semantics without reference to the tasking run-time system. + -- To achieve this goal, we now use soft links. + + ----------------------- + -- Local Subprograms -- + ----------------------- + + procedure Timed_Delay_NT (Time : Duration; Mode : Integer); + -- Timed delay procedure used when no tasking is active + + --------------- + -- Delay_For -- + --------------- + + procedure Delay_For (D : Duration) is + begin + if System.Parameters.Runtime_Traces then + Send_Trace_Info (W_Delay, D); + end if; + + SSL.Timed_Delay.all (Duration'Min (D, OSP.Max_Sensible_Delay), + OSP.Relative); + + if System.Parameters.Runtime_Traces then + Send_Trace_Info (M_Delay, D); + end if; + end Delay_For; + + ----------------- + -- Delay_Until -- + ----------------- + + procedure Delay_Until (T : Time) is + D : constant Duration := To_Duration (T); + + begin + if System.Parameters.Runtime_Traces then + Send_Trace_Info (WU_Delay, D); + end if; + + SSL.Timed_Delay.all (D, OSP.Absolute_Calendar); + + if System.Parameters.Runtime_Traces then + Send_Trace_Info (M_Delay, D); + end if; + end Delay_Until; + + -------------------- + -- Timed_Delay_NT -- + -------------------- + + procedure Timed_Delay_NT (Time : Duration; Mode : Integer) is + begin + OSP.Timed_Delay (Time, Mode); + end Timed_Delay_NT; + + ----------------- + -- To_Duration -- + ----------------- + + function To_Duration (T : Time) return Duration is + begin + return Duration (T); + end To_Duration; + +begin + -- Set up the Timed_Delay soft link to the non tasking version + -- if it has not been already set. + + -- If tasking is present, Timed_Delay has already set this soft + -- link, or this will be overriden during the elaboration of + -- System.Tasking.Initialization + + if SSL.Timed_Delay = null then + SSL.Timed_Delay := Timed_Delay_NT'Access; + end if; +end Ada.Calendar.Delays; |