326c64ff2c
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1658 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
534 lines
16 KiB
Prolog
534 lines
16 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: threads.yap *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: support threads *
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* *
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*************************************************************************/
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:- meta_predicate
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thread_create(:,-,+),
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thread_at_exit(:),
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thread_signal(+,:).
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:- initialization('$init_thread0').
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'$init_thread0' :-
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no_threads, !.
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'$init_thread0' :-
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'$create_mq'(0),
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'$add_thread_aliases'([main], 0),
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recorda('$thread_defaults', [0, 0, 0], _).
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'$top_thread_goal'(G, Detached) :-
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'$thread_self'(Id),
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(Detached == true -> '$detach_thread'(Id) ; true),
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'$current_module'(Module),
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'$system_catch'((G,'$close_thread'(Detached,true) ; '$close_thread'(Detached,false)),Module,Exception,'$thread_exception'(Exception,Detached)).
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'$close_thread'(Detached, Status) :-
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'$thread_self'(Id0),
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(Detached == true ->
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true
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;
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recorda('$thread_exit_status', [Id0|Status], _)
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),
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'$run_at_thread_exit'(Id0).
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'$thread_exception'(Exception,Detached) :-
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'$thread_self'(Id0),
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(Detached == true ->
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true
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;
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recorda('$thread_exit_status', [Id0|exception(Exception)], _)
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),
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'$run_at_thread_exit'(Id0).
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thread_create(Goal, Id) :-
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'$check_callable'(Goal, thread_create(Goal, Id)),
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( nonvar(Id) -> '$do_error'(type_error(variable,Id),G0) ; true ),
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recorded('$thread_defaults', [Stack, Trail, System], _),
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'$thread_new_tid'(Id),
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'$clean_db_on_id'(Id),
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'$create_mq'(Id),
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'$create_thread'(Goal, Stack, Trail, System, _, Id).
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thread_create(Goal, Id, Options) :-
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G0 = thread_create(Goal, Id, Options),
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'$check_callable'(Goal,G0),
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( nonvar(Id) -> '$do_error'(type_error(variable,Id),G0) ; true ),
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'$thread_options'(Options, Aliases, Stack, Trail, System, Detached, G0),
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'$thread_new_tid'(Id),
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'$clean_db_on_id'(Id),
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'$add_thread_aliases'(Aliases, Id),
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'$create_mq'(Id),
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'$create_thread'(Goal, Stack, Trail, System, Detached, Id).
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'$clean_db_on_id'(Id) :-
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recorded('$thread_exit_status', [Id|_], R),
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erase(R),
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fail.
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'$clean_db_on_id'(Id) :-
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recorded('$thread_alias',[Id|_],R),
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erase(R),
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fail.
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'$clean_db_on_id'(Id) :-
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recorded('$thread_exit_hook',[Id|_],R),
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erase(R),
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fail.
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'$clean_db_on_id'(_).
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'$thread_options'(V, _, _, _, _, _, G) :- var(V), !,
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'$do_error'(instantiation_error,G).
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'$thread_options'([], [], Stack, Trail, System, _, _) :-
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recorded('$thread_defaults', [DefaultStack, DefaultTrail, DefaultSystem], _),
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( var(Stack) -> Stack = DefaultStack; true ),
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( var(Trail) -> Trail = DefaultTrail; true ),
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( var(System) -> System = DefaultSystem; true ).
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'$thread_options'([Opt|Opts], Aliases, Stack, Trail, System, Detached, G0) :-
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'$thread_option'(Opt, Aliases, Stack, Trail, System, Detached, G0, Aliases0),
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'$thread_options'(Opts, Aliases0, Stack, Trail, System, Detached, G0).
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'$thread_option'(Option, Aliases, _, _, _, _, G0, Aliases) :- var(Option), !,
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'$do_error'(instantiation_error,G0).
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'$thread_option'(stacks(Stack), Aliases, Stack, _, _, _, G0, Aliases) :- !,
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( \+ integer(Stack) -> '$do_error'(type_error(integer,Stack),G0) ; true ).
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'$thread_option'(trail(Trail), Aliases, _, Trail, _, _, G0, Aliases) :- !,
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( \+ integer(Trail) -> '$do_error'(type_error(integer,Trail),G0) ; true ).
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'$thread_option'(system(System), Aliases, _, _, System, _, G0, Aliases) :- !,
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( \+ integer(System) -> '$do_error'(type_error(integer,System),G0) ; true ).
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'$thread_option'(alias(Alias), [Alias|Aliases], _, _, _, _, G0, Aliases) :- !,
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( \+ atom(Alias) -> '$do_error'(type_error(atom,Alias),G0) ; true ).
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'$thread_option'(detached(B), Aliases, _, _, _, B, G0, Aliases) :- !,
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( B \== true, B \== false -> '$do_error'(domain_error(flag_value,B+[true,false]),G0) ; true ).
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'$thread_option'(Option, Aliases, _, _, _, _, G0, Aliases) :-
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'$do_error'(domain_error(thread_create_option,Option+[stacks(_),trail(_),system(_),alias(_),detached(_)]),G0).
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'$add_thread_aliases'([Alias|_], Id) :-
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recorded('$thread_alias',[_|Alias],_), !,
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'$do_error'(permission_error(alias,new,Alias),thread_create_alias(Id,Alias)).
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'$add_thread_aliases'([Alias|Aliases], Id) :-
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recorda('$thread_alias',[Id|Alias],_),
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'$add_thread_aliases'(Aliases, Id).
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'$add_thread_aliases'([], _).
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thread_defaults(Defaults) :- nonvar(Defaults), !,
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'$do_error'(type_error(variable,Id),thread_defaults(Defaults)).
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thread_defaults([stack(Stack), trail(Trail), system(System)]) :-
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recorded('$thread_defaults',[Stack, Trail, System], _).
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thread_set_defaults(V) :- var(V), !,
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'$do_error'(instantiation_error, thread_set_defaults(V)).
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thread_set_defaults([Default| Defaults]) :- !,
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'$thread_set_defaults'([Default| Defaults], thread_set_defaults([Default| Defaults])).
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thread_set_defaults(T) :-
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'$do_error'(type_error(list, T), thread_set_defaults(T)).
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'$thread_set_defaults'([], _).
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'$thread_set_defaults'([Default| Defaults], G) :- !,
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'$thread_set_default'(Default, G),
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'$thread_set_defaults'(Defaults, G).
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'$thread_set_default'(stack(Stack), G) :-
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\+ integer(Stack), !,
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'$do_error'(type_error(integer, Stack), G).
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'$thread_set_default'(stack(Stack), G) :-
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Stack < 0, !,
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'$do_error'(domain_error(not_less_than_zero, Stack), G).
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'$thread_set_default'(stack(Stack), G) :- !,
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recorded('$thread_defaults', [_, Trail, System], _),
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recorda('$thread_defaults', [Stack, Trail, System], _).
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'$thread_set_default'(trail(Trail), G) :-
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\+ integer(Trail), !,
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'$do_error'(type_error(integer, Trail), G).
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'$thread_set_default'(trail(Trail), G) :-
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Trail < 0, !,
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'$do_error'(domain_error(not_less_than_zero, Trail), G).
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'$thread_set_default'(trail(Trail), G) :- !,
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recorded('$thread_defaults', [Stack, _, System], _),
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recorda('$thread_defaults', [Stack, Trail, System], _).
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'$thread_set_default'(system(System), G) :-
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\+ integer(System), !,
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'$do_error'(type_error(integer, System), G).
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'$thread_set_default'(system(System), G0) :-
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System < 0, !,
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'$do_error'(domain_error(not_less_than_zero, System), G0).
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'$thread_set_default'(system(System), G) :- !,
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recorded('$thread_defaults', [Stack, Trail, _], _),
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recorda('$thread_defaults', [Stack, Trail, System], _).
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'$thread_set_default'(Default, G) :-
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'$do_error'(domain_error(thread_default, Default), G).
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thread_self(Id) :-
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'$thread_self'(Id0),
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'$check_thread_alias'(Id0,Id).
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'$check_thread_alias'(Id0,Id) :-
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recorded('$thread_alias',[Id0|Id],_), !.
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'$check_thread_alias'(Id,Id).
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/* Exit status may be true, false, exception(Term), exited(Term) */
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thread_join(Id, Status) :- nonvar(Status), !,
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'$do_error'(type_error(variable,Status),thread_join(Id, Status)).
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thread_join(Id, Status) :-
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'$check_thread_alias'(Id0,Id),
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'$thread_join'(Id0),
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'$erase_thread_aliases'(Id0),
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recorded('$thread_exit_status',[Id0|Status],R),
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erase(R),
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'$thread_destroy'(Id0).
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'$erase_thread_aliases'(Id0) :-
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recorded('$thread_alias',[Id0|_],R),
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erase(R),
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fail.
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'$erase_thread_aliases'(_).
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thread_detach(Id) :-
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'$check_thread_alias'(Id0,Id),
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'$detach_thread'(Id0).
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thread_exit(Term) :-
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'$thread_self'(Id0),
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'$run_at_thread_exit'(Id0),
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recorda('$thread_exit_status', [Id0|exited(Term)], _),
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'$thread_exit'.
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'$run_at_thread_exit'(Id0) :-
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findall(Hook, (recorded('$thread_exit_hook',[Id0|Hook],R), erase(R)), Hooks),
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'$run_thread_hooks'(Hooks),
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message_queue_destroy(Id0).
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'$run_thread_hooks'([]).
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'$run_thread_hooks'([Hook|Hooks]) :-
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'$thread_top_goal'(Hook),
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'$run_thread_hooks'(Hooks).
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thread_at_exit(Goal) :-
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'$check_callable'(Goal,thread_at_exit(Goal)),
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'$thread_self'(Id0),
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recordz('$thread_exit_hook',[Id0|Goal],_).
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current_thread(Tid, Status) :-
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var(Tid), !,
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'$cur_threads'(0, Tid, Status).
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current_thread(Tid, Status) :-
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( atom(Tid) ; integer(Tid) ), !,
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'$check_thread_alias'(Id0,Tid),
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'$valid_thread'(Id0),
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'$thr_status'(Id0, Status).
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current_thread(Tid, Status) :-
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'$do_error'(type_error(integer,Tid),current_thread(Tid, Status)).
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'$cur_threads'(Tid, TidName, Status) :-
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'$valid_thread'(Tid),
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'$thr_status'(Tid, Status),
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'$tid_to_alias'(Tid,TidName).
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'$cur_threads'(Tid, TidF, Status) :-
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'$valid_thread'(Tid),
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Tid1 is Tid+1,
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'$cur_threads'(Tid1, TidF, Status).
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'$thr_status'(Tid, Status) :-
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recorded('$thread_exit_status', [Tid|Status], _), !.
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'$thr_status'(_, running).
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'$tid_to_alias'(Tid,TidName) :-
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recorded('$thread_alias', [Tid|TidName], _), !.
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'$tid_to_alias'(Tid,Tid).
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mutex_create(V) :-
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var(V), !,
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'$new_mutex'(V),
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recorda('$mutex',[V|V],_).
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mutex_create(A) :-
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atom(A),
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recorded('$mutex',[A|_],_), !,
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'$do_error'(permission_error(create,mutex,A),mutex_create(A)).
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mutex_create(A) :-
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atom(A), !,
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'$new_mutex'(Id),
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recorda('$mutex',[A|Id],_).
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mutex_create(V) :-
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'$do_error'(type_error(atom,V),mutex_create(V)).
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mutex_destroy(V) :-
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var(V), !,
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'$do_error'(instantiation_error,mutex_destroy(V)).
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mutex_destroy(A) :-
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recorded('$mutex',[A|Id],R), !,
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'$destroy_mutex'(Id),
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erase(R).
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mutex_destroy(A) :-
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atom(A), !,
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'$do_error'(existence_error(mutex,A),mutex_destroy(A)).
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mutex_destroy(V) :-
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'$do_error'(type_error(atom,V),mutex_destroy(V)).
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mutex_lock(V) :-
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var(V), !,
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'$do_error'(instantiation_error,mutex_lock(V)).
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mutex_lock(A) :-
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recorded('$mutex',[A|Id],_), !,
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'$lock_mutex'(Id).
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mutex_lock(A) :-
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atom(A), !,
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mutex_create(A),
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mutex_lock(A).
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mutex_lock(V) :-
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'$do_error'(type_error(atom,V),mutex_lock(V)).
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mutex_trylock(V) :-
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var(V), !,
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'$do_error'(instantiation_error,mutex_trylock(V)).
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mutex_trylock(A) :-
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recorded('$mutex',[A|Id],_), !,
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'$trylock_mutex'(Id).
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mutex_trylock(A) :-
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atom(A), !,
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mutex_create(A),
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mutex_trylock(A).
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mutex_trylock(V) :-
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'$do_error'(type_error(atom,V),mutex_trylock(V)).
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mutex_unlock(V) :-
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var(V), !,
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'$do_error'(instantiation_error,mutex_unlock(V)).
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mutex_unlock(A) :-
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recorded('$mutex',[A|Id],_), !,
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( '$unlock_mutex'(Id) ->
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true
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;
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'$do_error'(permission_error(unlock,mutex,A),mutex_unlock(A))
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).
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mutex_unlock(A) :-
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atom(A), !,
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'$do_error'(existence_error(mutex,A),mutex_unlock(A)).
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mutex_unlock(V) :-
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'$do_error'(type_error(atom,V),mutex_unlock(V)).
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mutex_unlock_all :-
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'$thread_self'(T),
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recorded('$mutex',[_|Id],_),
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'$mutex_info'(Id, NRefs, T),
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NRefs > 0,
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'$mutex_unlock_all'(Id),
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fail.
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mutex_unlock_all.
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'$mutex_unlock_all'(Id) :-
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'$mutex_info'(Id, NRefs, _),
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NRefs > 0,
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'$unlock_mutex'(Id),
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'$mutex_unlock_all'(Id).
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current_mutex(M, T, NRefs) :-
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recorded('$mutex',[M|Id],_),
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'$mutex_info'(Id, NRefs, T).
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message_queue_create(Cond) :-
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var(Cond), !,
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mutex_create(Mutex),
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'$cond_create'(Cond),
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'$mq_iname'(Cond, CName),
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recorda('$queue',q(Cond,Mutex,Cond,CName), _).
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message_queue_create(Name) :-
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atom(Name),
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recorded('$thread_alias',[_,Name],_), !,
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'$do_error'(permission_error(create,message_queue,Name),message_queue_create(Name)).
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message_queue_create(Name) :-
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atom(Name), !,
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'$create_mq'(Name).
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message_queue_create(Name) :-
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'$do_error'(type_error(atom,Name),message_queue_create(Name)).
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'$create_mq'(Name) :-
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mutex_create(Mutex),
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'$cond_create'(Cond),
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'$mq_iname'(Name, CName),
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recorda('$queue',q(Name,Mutex,Cond, CName),_).
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'$mq_iname'(I,X) :-
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integer(I), !,
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number_codes(I,Codes),
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atom_codes(X, [0'$,0'M,0'Q,0'_|Codes]).
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'$mq_iname'(A,X) :-
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atom_concat('$MQ_NAME_KEY_',A,X).
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message_queue_destroy(Name) :-
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var(Name), !,
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'$do_error'(instantiation_error,message_queue_destroy(Name)).
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message_queue_destroy(Queue) :-
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recorded('$queue',q(Queue,Mutex,Cond,CName),R), !,
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erase(R),
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'$cond_destroy'(Cond),
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mutex_destroy(Mutex),
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'$clean_mqueue'(CName).
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message_queue_destroy(Queue) :-
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atom(Queue), !,
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'$do_error'(existence_error(message_queue,Queue),message_queue_destroy(Queue)).
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message_queue_destroy(Name) :-
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'$do_error'(type_error(atom,Name),message_queue_destroy(Name)).
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'$clean_mqueue'(Queue) :-
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recorded(Queue,_,R),
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erase(R),
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fail.
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'$clean_mqueue'(_).
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thread_send_message(Queue, Term) :- var(Queue), !,
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'$do_error'(instantiation_error,thread_send_message(Queue,Term)).
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thread_send_message(Queue, Term) :-
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recorded('$thread_alias',[Id|Queue],_), !,
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thread_send_message(Id, Term).
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thread_send_message(Queue, Term) :-
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recorded('$queue',q(Queue,Mutex,Cond,Key),_), !,
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mutex_lock(Mutex),
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recordz(Key,Term,_),
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'$cond_broadcast'(Cond),
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mutex_unlock(Mutex).
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thread_send_message(Queue, Term) :-
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'$do_error'(existence_error(message_queue,Queue),thread_send_message(Queue,Term)).
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thread_get_message(Term) :-
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'$thread_self'(Id),
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thread_get_message(Id, Term).
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thread_get_message(Queue, Term) :- var(Queue), !,
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'$do_error'(instantiation_error,thread_get_message(Queue,Term)).
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thread_get_message(Queue, Term) :-
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recorded('$thread_alias',[Id|Queue],_), !,
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thread_get_message(Id, Term).
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thread_get_message(Queue, Term) :-
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recorded('$queue',q(Queue,Mutex,Cond,Key),_), !,
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mutex_lock(Mutex),
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'$thread_get_message_loop'(Key, Term, Mutex, Cond).
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thread_get_message(Queue, Term) :-
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'$do_error'(existence_error(message_queue,Queue),thread_get_message(Queue,Term)).
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'$thread_get_message_loop'(Key, Term, Mutex, _) :-
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recorded(Key,Term,R), !,
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erase(R),
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mutex_unlock(Mutex).
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'$thread_get_message_loop'(Key, Term, Mutex, Cond) :-
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'$cond_wait'(Cond, Mutex),
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'$thread_get_message_loop'(Key, Term, Mutex, Cond).
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thread_peek_message(Term) :-
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'$thread_self'(Id),
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thread_peek_message(Id, Term).
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thread_peek_message(Queue, Term) :- var(Queue), !,
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'$do_error'(instantiation_error,thread_peek_message(Queue,Term)).
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thread_peek_message(Queue, Term) :-
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recorded('$thread_alias',[Id|Queue],_), !,
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thread_peek_message(Id, Term).
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thread_peek_message(Queue, Term) :-
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|
recorded('$queue',q(Queue,Mutex,_,Key),_), !,
|
|
mutex_lock(Mutex),
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|
'$thread_peek_message2'(Key, Term, Mutex).
|
|
thread_peek_message(Queue, Term) :-
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|
'$do_error'(existence_error(message_queue,Queue),thread_peek_message(Queue,Term)).
|
|
|
|
|
|
'$thread_peek_message2'(Key, Term, Mutex) :-
|
|
recorded(Key,Term,_), !,
|
|
mutex_unlock(Mutex).
|
|
'$thread_peek_message2'(_, _, Mutex) :-
|
|
mutex_unlock(Mutex),
|
|
fail.
|
|
|
|
thread_local(X) :-
|
|
'$current_module'(M),
|
|
'$thread_local'(X,M).
|
|
|
|
'$thread_local'(X,M) :- var(X), !,
|
|
'$do_error'(instantiation_error,thread_local(M:X)).
|
|
'$thread_local'(Mod:Spec,_) :- !,
|
|
'$thread_local'(Spec,Mod).
|
|
'$thread_local'([], _) :- !.
|
|
'$thread_local'([H|L], M) :- !, '$thread_local'(H, M), '$thread_local'(L, M).
|
|
'$thread_local'((A,B),M) :- !, '$thread_local'(A,M), '$thread_local'(B,M).
|
|
'$thread_local'(X,M) :- !,
|
|
'$thread_local2'(X,M).
|
|
|
|
'$thread_local2'(A/N, Mod) :- integer(N), atom(A), !,
|
|
functor(T,A,N),
|
|
(Mod \= idb -> '$flags'(T,Mod,F,F) ; true),
|
|
( '$install_thread_local'(T,Mod) -> true ;
|
|
F /\ 0x08002000 =\= 0 -> '$do_error'(permission_error(modify,dynamic_procedure,A/N),thread_local(Mod:A/N)) ;
|
|
'$do_error'(permission_error(modify,static_procedure,A/N),thread_local(Mod:A/N))
|
|
).
|
|
'$thread_local2'(X,Mod) :-
|
|
'$do_error'(type_error(callable,X),thread_local(Mod:X)).
|
|
|
|
|
|
thread_sleep(Time) :-
|
|
var(Time), !,
|
|
'$do_error'(instantiation_error,thread_sleep(Time)).
|
|
thread_sleep(Time) :-
|
|
integer(Time), Time >= 0, !,
|
|
'$thread_sleep'(Time,0,_,_).
|
|
thread_sleep(Time) :-
|
|
float(Time), Time >= 0, !,
|
|
STime is integer(float_integer_part(Time)),
|
|
NTime is integer(float_fractional_part(Time))*1000000000,
|
|
'$thread_sleep'(STime,NTime,_,_).
|
|
thread_sleep(Time) :-
|
|
number(Time),
|
|
'$do_error'(domain_error(not_less_than_zero,Time),thread_sleep(Time)).
|
|
thread_sleep(Time) :-
|
|
'$do_error'(type_error(number,Time),thread_sleep(Time)).
|
|
|
|
|
|
thread_signal(Thread, Goal) :-
|
|
var(Thread), !,
|
|
'$do_error'(instantiation_error,thread_signal(Thread, Goal)).
|
|
thread_signal(Thread, Goal) :-
|
|
'$check_callable'(Goal,thread_signal(Thread,Goal)).
|
|
thread_signal(Thread, Goal) :-
|
|
recorded('$thread_alias',[Id|Thread],_), !,
|
|
'$thread_signal'(Id, Goal).
|
|
thread_signal(Thread, Goal) :-
|
|
integer(Thread), !,
|
|
'$thread_signal'(Thread, Goal).
|
|
thread_signal(Thread, Goal) :-
|
|
'$do_error'(type_error(integer,Thread),thread_signal(Thread, Goal)).
|
|
|
|
'$thread_signal'(Thread, Goal) :-
|
|
( recorded('$thread_signal',[Thread|_],R), erase(R), fail ; true ),
|
|
recorda('$thread_signal',[Thread|Goal],_),
|
|
'$signal_thread'(Thread).
|
|
|
|
'$thread_gfetch'(G) :-
|
|
'$thread_self'(Id),
|
|
recorded('$thread_signal',[Id|G],R),
|
|
erase(R).
|
|
|
|
|
|
threads :-
|
|
write('--------------------------------------------------------------'), nl,
|
|
format("~t~a~38+~n", 'Thread Status'),
|
|
write('--------------------------------------------------------------'), nl,
|
|
current_thread(Thread, Status),
|
|
format("~t~q~30+ ~q~n", [Thread, Status]),
|
|
fail.
|
|
threads :-
|
|
write('--------------------------------------------------------------'), nl.
|