390 lines
16 KiB
Plaintext
390 lines
16 KiB
Plaintext
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%%% -*- Mode: Prolog; -*-
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Concurrent alarms was developed at Katholieke Universiteit Leuven
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%
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% Copyright 2010
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% Katholieke Universiteit Leuven
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%
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% Contributions to this file:
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% Author: Theofrastos Mantadelis
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% Version: 0.1
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% Date: 01/02/2011
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% Comments: The timer implementation is inspired by Bernd Gutmann timers
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Artistic License 2.0
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%
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% Copyright (c) 2000-2006, The Perl Foundation.
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%
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% Everyone is permitted to copy and distribute verbatim copies of this
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% license document, but changing it is not allowed. Preamble
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%
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% This license establishes the terms under which a given free software
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% Package may be copied, modified, distributed, and/or
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% redistributed. The intent is that the Copyright Holder maintains some
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% artistic control over the development of that Package while still
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% keeping the Package available as open source and free software.
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%
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% You are always permitted to make arrangements wholly outside of this
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% license directly with the Copyright Holder of a given Package. If the
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% terms of this license do not permit the full use that you propose to
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% make of the Package, you should contact the Copyright Holder and seek
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% a different licensing arrangement. Definitions
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%
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% "Copyright Holder" means the individual(s) or organization(s) named in
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% the copyright notice for the entire Package.
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%
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% "Contributor" means any party that has contributed code or other
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% procedures.
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% "You" and "your" means any person who would like to copy, distribute,
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% "Package" means the collection of files distributed by the Copyright
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% given Package may consist of either the Standard Version, or a
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% Modified Version.
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% "Standard Version" refers to the Package if it has not been modified,
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% "Modified Version" means the Package, if it has been changed, and such
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Permission for Use and Modification Without Distribution
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% either gratis or for a Distributor Fee, provided that you duplicate
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% all of the original copyright notices and associated disclaimers. At
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% your discretion, such verbatim copies may or may not include a
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% Compiled form of the Package.
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% (3) You may apply any bug fixes, portability changes, and other
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% ensure that installation of your Modified Version does not prevent the
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% modified Version must bear a name that is different from the name of
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% the Standard Version. (c) allow anyone who receives a copy of the
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% Distribution of Compiled Forms of the Standard Version or
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% Modified Versions without the Source
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% (5) You may Distribute Compiled forms of the Standard Version without
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% the Source, provided that you include complete instructions on how to
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% get the Source of the Standard Version. Such instructions must be
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% valid at the time of your distribution. If these instructions, at any
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% time while you are carrying out such distribution, become invalid, you
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% must provide new instructions on demand or cease further
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% distribution. If you provide valid instructions or cease distribution
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% within thirty days after you become aware that the instructions are
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% invalid, then you do not forfeit any of your rights under this
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% license.
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% (6) You may Distribute a Modified Version in Compiled form without the
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% General Provisions
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% free-of-charge patent license to make, have made, use, offer to sell,
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% (14) Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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:- module(c_alarms, [set_alarm/3,
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unset_alarm/1,
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time_out_call/3,
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timer_start/1,
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timer_restart/1,
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timer_stop/2,
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timer_elapsed/2,
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timer_pause/2]).
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% set_alarm(+Seconds, +Execute, -ID)
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% calls Executes after a time interval of Seconds
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% ID is returned to be able to unset the alarm (the call will not be executed)
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% set_alarm/3 supports multiple & nested settings of alarms.
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% Known Bug: There is the case that an alarm might trigger +-1 second of the set time.
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%
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% unset_alarm(+ID)
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% It will unschedule the alarm.
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% It will not affect other concurrent alarms.
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%
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% time_out_call(+Seconds, +Goal, -Return)
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% It will will execute the closure Goal and returns its success or failure at Return.
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% If the goal times out in Seconds then Return = timeout.
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:- use_module(library(lists), [member/2, memberchk/2, delete/3]).
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:- use_module(library(ordsets), [ord_add_element/3]).
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:- use_module(library(apply_macros), [maplist/3]).
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:- initialization(local_init).
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local_init:-
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bb_put(alarms, []),
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bb_put(identity, 0).
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:- meta_predicate(set_alarm(+, 0, -)).
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:- meta_predicate(time_out_call(+, 0, -)).
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get_next_identity(ID):-
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bb_get(identity, ID),
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NID is ID + 1,
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bb_put(identity, NID).
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set_alarm(Seconds, Execute, ID):-
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bb_get(alarms, []),
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get_next_identity(ID), !,
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bb_put(alarms, [alarm(Seconds, ID, Execute)]),
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alarm(Seconds, alarm_handler, _).
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set_alarm(Seconds, Execute, ID):-
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get_next_identity(ID), !,
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bb_get(alarms, [alarm(CurrentSeconds, CurrentID, CurrentExecute)|Alarms]),
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alarm(0, true, Remaining),
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Elapsed is CurrentSeconds - Remaining - 1,
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maplist(subtract(Elapsed), [alarm(CurrentSeconds, CurrentID, CurrentExecute)|Alarms], RemainingAlarms),
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ord_add_element(RemainingAlarms, alarm(Seconds, ID, Execute), [alarm(NewSeconds, NewID, NewToExecute)|NewAlarms]),
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bb_put(alarms, [alarm(NewSeconds, NewID, NewToExecute)|NewAlarms]),
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alarm(NewSeconds, alarm_handler, _).
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set_alarm(Seconds, Execute, ID):-
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throw(error(permission_error(create, alarm, set_alarm(Seconds, Execute, ID)), 'Non permitted alarm identifier.')).
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subtract(Elapsed, alarm(Seconds, ID, Execute), alarm(NewSeconds, ID, Execute)):-
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NewSeconds is Seconds - Elapsed.
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unset_alarm(ID):-
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\+ ground(ID),
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throw(error(instantiation_error, 'Alarm ID needs to be instantiated.')).
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unset_alarm(ID):-
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bb_get(alarms, Alarms),
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memberchk(alarm(_Seconds, ID, _Execute), Alarms),
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throw(error(existence_error(alarm, unset_alarm(ID)), 'Alarm does not exist.')).
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unset_alarm(ID):-
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alarm(0, true, Remaining),
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bb_get(alarms, Alarms),
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delete_alarm(Alarms, ID, NewAlarms),
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bb_put(alarms, NewAlarms),
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(NewAlarms = [alarm(Seconds, _, _)|_] ->
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alarm(Seconds, alarm_handler, _)
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;
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true
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).
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delete_alarm(Alarms, ID, NewAlarms):-
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memberchk(alarm(Seconds, ID, Execute), Alarms),
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delete(Alarms, alarm(Seconds, ID, Execute), NewAlarms).
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alarm_handler:-
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bb_get(alarms, [alarm(_, _, CurrentExecute)|[]]),
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bb_put(alarms, []),
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call(CurrentExecute).
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alarm_handler:-
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bb_get(alarms, [alarm(Elapsed, CurrentID, CurrentExecute)|Alarms]),
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maplist(subtract(Elapsed), Alarms, NewAlarms),
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find_zeros(NewAlarms, ZeroAlarms),
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findall(alarm(S, ID, E), (member(alarm(S, ID, E), NewAlarms), S > 0), NonZeroAlarms),
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bb_put(alarms, NonZeroAlarms),
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(NonZeroAlarms = [alarm(NewSeconds, _, _)|_] ->
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alarm(NewSeconds, alarm_handler, _)
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;
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true
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),
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execute([alarm(0, CurrentID, CurrentExecute)|ZeroAlarms]).
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find_zeros([], []).
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find_zeros([alarm(0, ID, E)|T], [alarm(0, ID, E)|R]):-
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find_zeros(T, R).
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find_zeros([alarm(S, _, _)|T], R):-
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S > 0,
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find_zeros(T, R).
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execute([]).
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execute([alarm(_, _, Execute)|R]):-
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call(Execute),
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execute(R).
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time_out_call(Seconds, Goal, Return):-
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bb_get(identity, ID),
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catch((
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(set_alarm(Seconds, throw(timeout(ID)), ID) ; unset_alarm(ID), fail),
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Goal,
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unset_alarm(ID),
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Return = success)
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, Exception, (
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(Exception == timeout(ID) ->
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Return = timeout
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;
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unset_alarm(ID),
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throw(Exception)
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))).
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:- dynamic('$timer'/3).
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timer_start(Name):-
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\+ ground(Name),
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throw(error(instantiation_error, 'Timer name needs to be instantiated.')).
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timer_start(Name):-
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'$timer'(Name, _, _),
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throw(error(permission_error(create, timer, timer_start(Name)), 'Timer already exists.')).
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timer_start(Name):-
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statistics(walltime, [StartTime, _]),
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assertz('$timer'(Name, running, StartTime)).
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||
|
|
timer_restart(Name):-
|
||
|
|
\+ ground(Name),
|
||
|
|
throw(error(instantiation_error, 'Timer name needs to be instantiated.')).
|
||
|
|
timer_restart(Name):-
|
||
|
|
\+ '$timer'(Name, _, _), !,
|
||
|
|
statistics(walltime, [StartTime, _]),
|
||
|
|
assertz('$timer'(Name, running, StartTime)).
|
||
|
|
timer_restart(Name):-
|
||
|
|
retract('$timer'(Name, running, _)), !,
|
||
|
|
statistics(walltime, [StartTime, _]),
|
||
|
|
assertz('$timer'(Name, running, StartTime)).
|
||
|
|
timer_restart(Name):-
|
||
|
|
retract('$timer'(Name, paused, Duration)),
|
||
|
|
statistics(walltime, [StartTime, _]),
|
||
|
|
Elapsed is StartTime - Duration,
|
||
|
|
assertz('$timer'(Name, running, Elapsed)).
|
||
|
|
|
||
|
|
timer_stop(Name, Elapsed):-
|
||
|
|
\+ '$timer'(Name, _, _),
|
||
|
|
throw(error(existence_error(timer, timer_stop(Name, Elapsed)), 'Timer does not exist.')).
|
||
|
|
timer_stop(Name, Elapsed):-
|
||
|
|
retract('$timer'(Name, running, StartTime)), !,
|
||
|
|
statistics(walltime, [EndTime, _]),
|
||
|
|
Elapsed is EndTime - StartTime.
|
||
|
|
timer_stop(Name, Elapsed):-
|
||
|
|
retract('$timer'(Name, paused, Elapsed)).
|
||
|
|
|
||
|
|
timer_elapsed(Name, Elapsed):-
|
||
|
|
\+ '$timer'(Name, _, _),
|
||
|
|
throw(error(existence_error(timer, timer_elapsed(Name, Elapsed)), 'Timer does not exist.')).
|
||
|
|
timer_elapsed(Name, Elapsed):-
|
||
|
|
'$timer'(Name, running, StartTime), !,
|
||
|
|
statistics(walltime, [EndTime, _]),
|
||
|
|
Elapsed is EndTime - StartTime.
|
||
|
|
timer_elapsed(Name, Elapsed):-
|
||
|
|
'$timer'(Name, paused, Elapsed).
|
||
|
|
|
||
|
|
timer_pause(Name, Elapsed):-
|
||
|
|
\+ '$timer'(Name, _, _),
|
||
|
|
throw(error(existence_error(timer, timer_pause(Name, Elapsed)), 'Timer does not exist.')).
|
||
|
|
timer_pause(Name, Elapsed):-
|
||
|
|
'$timer'(Name, paused, _),
|
||
|
|
throw(error(permission_error(timer, timer_pause(Name, Elapsed)), 'Timer already paused.')).
|
||
|
|
timer_pause(Name, Elapsed):-
|
||
|
|
retract('$timer'(Name, _, StartTime)),
|
||
|
|
statistics(walltime, [EndTime, _]),
|
||
|
|
Elapsed is EndTime - StartTime,
|
||
|
|
assert('$timer'(Name, paused, Elapsed)).
|