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tasks.c
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/******************************************************************************
Copyright (c) 1992, 1995, 1996 Xerox Corporation. All rights reserved.
Portions of this code were written by Stephen White, aka ghond.
Use and copying of this software and preparation of derivative works based
upon this software are permitted. Any distribution of this software or
derivative works must comply with all applicable United States export
control laws. This software is made available AS IS, and Xerox Corporation
makes no warranty about the software, its performance or its conformity to
any specification. Any person obtaining a copy of this software is requested
to send their name and post office or electronic mail address to:
Pavel Curtis
Xerox PARC
3333 Coyote Hill Rd.
Palo Alto, CA 94304
Pavel@Xerox.Com
*****************************************************************************/
#include "my-string.h"
#include "my-time.h"
#include "config.h"
#include "db.h"
#include "db_io.h"
#include "decompile.h"
#include "eval_env.h"
#include "eval_vm.h"
#include "exceptions.h"
#include "execute.h"
#include "functions.h"
#include "list.h"
#include "log.h"
#include "match.h"
#include "options.h"
#include "parse_cmd.h"
#include "parser.h"
#include "random.h"
#include "server.h"
#include "storage.h"
#include "streams.h"
#include "structures.h"
#include "tasks.h"
#include "utils.h"
#include "verbs.h"
#include "version.h"
typedef struct forked_task {
int id;
Program *program;
activation a;
Var *rt_env;
int f_index;
time_t start_time;
} forked_task;
typedef struct suspended_task {
vm the_vm;
time_t start_time;
Var value;
} suspended_task;
typedef struct {
char *string;
int length;
} input_task;
typedef struct task {
struct task *next;
task_kind kind;
union {
input_task input;
forked_task forked;
suspended_task suspended;
} t;
} task;
typedef struct tqueue {
/*
* A task queue can be in one of four possible states, depending upon the
* values of its `player' and `connected' slots.
*
* When people first connect to the MOO, they are assigned negative player
* object numbers. Once they log in (either by creating a new player
* object or by connecting to an existing one), the connection is changed
* to refer to the appropriate, non-negative, player number.
*
* Input tasks for logged-in players (with non-negative `player' slots) are
* interpreted as normal MOO commands. Those for anonymous players (with
* negative `player' slots) are treated specially: they are passed to a
* particular verb on the system object. If that verb returns a valid
* player object number, then that is used as the new player number for the
* connection.
*
* The `connected' field is true iff this queue has an associated open
* network connection. Queues without such connections may nonetheless
* contain input tasks, either typed ahead before disconnection or else
* entered via the `force_input()' function.
*
* If an unconnected queue becomes empty, it is destroyed.
*/
struct tqueue *next, **prev; /* prev only valid on idle_tqueues */
Objid player;
Objid handler;
int connected;
task *first_input, **last_input;
int total_input_length;
int last_input_task_id;
int input_suspended;
task *first_bg, **last_bg;
int usage; /* a kind of inverted priority */
int num_bg_tasks; /* in either here or waiting_tasks */
int hold_input; /* make input tasks wait for read() */
char *output_prefix, *output_suffix;
const char *flush_cmd;
Stream *program_stream;
Objid program_object;
const char *program_verb;
char reading; /* boolean */
vm reading_vm;
} tqueue;
typedef struct ext_queue {
struct ext_queue *next;
task_enumerator enumerator;
} ext_queue;
#define INPUT_HIWAT MAX_QUEUED_INPUT
#define INPUT_LOWAT (INPUT_HIWAT / 2)
#define NO_USAGE -1
int current_task_id;
static tqueue *idle_tqueues = 0, *active_tqueues = 0;
static task *waiting_tasks = 0; /* forked and suspended tasks */
static ext_queue *external_queues = 0;
#define GET_START_TIME(ttt) \
(ttt->kind == TASK_FORKED \
? ttt->t.forked.start_time \
: ttt->t.suspended.start_time)
static void
deactivate_tqueue(tqueue * tq)
{
tq->usage = NO_USAGE;
tq->next = idle_tqueues;
tq->prev = &idle_tqueues;
if (idle_tqueues)
idle_tqueues->prev = &(tq->next);
idle_tqueues = tq;
}
static void
activate_tqueue(tqueue * tq)
{
tqueue **qq = &active_tqueues;
while (*qq && (*qq)->usage <= tq->usage)
qq = &((*qq)->next);
tq->next = *qq;
tq->prev = 0;
*qq = tq;
}
static void
ensure_usage(tqueue * tq)
{
if (tq->usage == NO_USAGE) {
tq->usage = active_tqueues ? active_tqueues->usage : 0;
/* Remove tq from idle_tqueues... */
*(tq->prev) = tq->next;
if (tq->next)
tq->next->prev = tq->prev;
/* ...and put it on active_tqueues. */
activate_tqueue(tq);
}
}
char *
default_flush_command(void)
{
const char *str = server_string_option("default_flush_command", ".flush");
return (str && str[0] != '\0') ? str_dup(str) : 0;
}
static tqueue *
find_tqueue(Objid player, int create_if_not_found)
{
tqueue *tq;
for (tq = active_tqueues; tq; tq = tq->next)
if (tq->player == player)
return tq;
for (tq = idle_tqueues; tq; tq = tq->next)
if (tq->player == player)
return tq;
if (!create_if_not_found)
return 0;
tq = mymalloc(sizeof(tqueue), M_TASK);
deactivate_tqueue(tq);
tq->player = player;
tq->handler = 0;
tq->connected = 0;
tq->first_input = tq->first_bg = 0;
tq->last_input = &(tq->first_input);
tq->last_bg = &(tq->first_bg);
tq->total_input_length = tq->input_suspended = 0;
tq->output_prefix = tq->output_suffix = 0;
tq->flush_cmd = default_flush_command();
tq->program_stream = 0;
tq->reading = 0;
tq->hold_input = 0;
tq->num_bg_tasks = 0;
tq->last_input_task_id = 0;
return tq;
}
static void
free_tqueue(tqueue * tq)
{
/* Precondition: tq is on idle_tqueues */
if (tq->output_prefix)
free_str(tq->output_prefix);
if (tq->output_suffix)
free_str(tq->output_suffix);
if (tq->flush_cmd)
free_str(tq->flush_cmd);
if (tq->program_stream)
free_stream(tq->program_stream);
if (tq->reading)
free_vm(tq->reading_vm, 1);
*(tq->prev) = tq->next;
if (tq->next)
tq->next->prev = tq->prev;
myfree(tq, M_TASK);
}
static void
enqueue_bg_task(tqueue * tq, task * t)
{
*(tq->last_bg) = t;
tq->last_bg = &(t->next);
t->next = 0;
}
static task *
dequeue_bg_task(tqueue * tq)
{
task *t = tq->first_bg;
if (t) {
tq->first_bg = t->next;
if (t->next == 0)
tq->last_bg = &(tq->first_bg);
else
t->next = 0;
tq->num_bg_tasks--;
}
return t;
}
static task *
dequeue_input_task(tqueue * tq)
{
task *t = tq->first_input;
if (t) {
tq->first_input = t->next;
if (t->next == 0)
tq->last_input = &(tq->first_input);
else
t->next = 0;
tq->total_input_length -= t->t.input.length;
if (tq->input_suspended
&& tq->connected
&& tq->total_input_length < INPUT_LOWAT) {
server_resume_input(tq->player);
tq->input_suspended = 0;
}
}
return t;
}
static task *
dequeue_any_task(tqueue * tq)
{
task *t = dequeue_input_task(tq);
if (t)
return t;
else
return dequeue_bg_task(tq);
}
static void
free_task(task * t, int strong)
{ /* for FORKED tasks, strong == 1 means free the rt_env also.
for SUSPENDED tasks, strong == 1 means free the vm also. */
switch (t->kind) {
case TASK_INPUT:
free_str(t->t.input.string);
break;
case TASK_FORKED:
if (strong) {
free_rt_env(t->t.forked.rt_env,
t->t.forked.program->num_var_names);
free_str(t->t.forked.a.verb);
free_str(t->t.forked.a.verbname);
}
free_program(t->t.forked.program);
break;
case TASK_SUSPENDED:
if (strong)
free_vm(t->t.suspended.the_vm, 1);
break;
}
myfree(t, M_TASK);
}
static int
new_task_id(void)
{
int i;
do {
i = RANDOM();
} while (i == 0);
return i;
}
static void
start_programming(tqueue * tq, char *argstr)
{
db_verb_handle h;
const char *message, *vname;
h = find_verb_for_programming(tq->player, argstr, &message, &vname);
notify(tq->player, message);
if (h.ptr) {
tq->program_stream = new_stream(100);
tq->program_object = db_verb_definer(h);
tq->program_verb = str_dup(vname);
}
}
struct state {
Objid player;
int nerrors;
char *input;
};
static void
my_error(void *data, const char *msg)
{
struct state *s = data;
notify(s->player, msg);
s->nerrors++;
}
static int
my_getc(void *data)
{
struct state *s = data;
if (*(s->input) != '\0')
return *(s->input++);
else
return EOF;
}
static Parser_Client client =
{my_error, 0, my_getc};
static void
end_programming(tqueue * tq)
{
Objid player = tq->player;
if (!valid(tq->program_object))
notify(player, "That object appears to have disappeared ...");
else {
db_verb_handle h;
Var desc;
desc.type = TYPE_STR;
desc.v.str = tq->program_verb;
h = find_described_verb(tq->program_object, desc);
if (!h.ptr)
notify(player, "That verb appears to have disappeared ...");
else {
struct state s;
Program *program;
char buf[30];
s.player = tq->player;
s.nerrors = 0;
s.input = stream_contents(tq->program_stream);
program = parse_program(current_version, client, &s);
sprintf(buf, "%d error(s).", s.nerrors);
notify(player, buf);
if (program) {
db_set_verb_program(h, program);
notify(player, "Verb programmed.");
} else
notify(player, "Verb not programmed.");
}
}
free_str(tq->program_verb);
free_stream(tq->program_stream);
tq->program_stream = 0;
}
static void
set_delimiter(char **slot, const char *string)
{
if (*slot)
free_str(*slot);
if (*string == '\0')
*slot = 0;
else
*slot = str_dup(string);
}
static int
find_verb_on(Objid oid, Parsed_Command * pc, db_verb_handle * vh)
{
if (!valid(oid))
return 0;
*vh = db_find_command_verb(oid, pc->verb,
(pc->dobj == oid ? ASPEC_THIS
: pc->dobj == NOTHING ? ASPEC_NONE
: ASPEC_ANY),
pc->prep,
(pc->iobj == oid ? ASPEC_THIS
: pc->iobj == NOTHING ? ASPEC_NONE
: ASPEC_ANY));
return vh->ptr != 0;
}
static int
do_command_task(tqueue * tq, char *command)
{
if (tq->program_stream) { /* We're programming */
if (strcmp(command, ".") == 0) /* Done programming */
end_programming(tq);
else
stream_printf(tq->program_stream, "%s\n", command);
} else {
Parsed_Command *pc = parse_command(command, tq->player);
if (!pc)
return 0;
if (is_programmer(tq->player) && verbcasecmp(".pr*ogram", pc->verb)) {
if (pc->args.v.list[0].v.num != 1)
notify(tq->player, "Usage: .program object:verb");
else
start_programming(tq, (char *) pc->args.v.list[1].v.str);
} else if (strcmp(pc->verb, "PREFIX") == 0
|| strcmp(pc->verb, "OUTPUTPREFIX") == 0)
set_delimiter(&(tq->output_prefix), pc->argstr);
else if (strcmp(pc->verb, "SUFFIX") == 0
|| strcmp(pc->verb, "OUTPUTSUFFIX") == 0)
set_delimiter(&(tq->output_suffix), pc->argstr);
else {
Objid location = (valid(tq->player)
? db_object_location(tq->player)
: NOTHING);
Objid this;
db_verb_handle vh;
Var result, args;
result.type = TYPE_INT; /* for free_var() if task isn't DONE */
if (tq->output_prefix)
notify(tq->player, tq->output_prefix);
args = parse_into_wordlist(command);
if (run_server_task_setting_id(tq->player, tq->handler,
"do_command", args, command,
&result, &(tq->last_input_task_id))
!= OUTCOME_DONE
|| is_true(result)) {
/* Do nothing more; we assume :do_command handled it. */
} else if (find_verb_on(this = tq->player, pc, &vh)
|| find_verb_on(this = location, pc, &vh)
|| find_verb_on(this = pc->dobj, pc, &vh)
|| find_verb_on(this = pc->iobj, pc, &vh)
|| (valid(this = location)
&& (vh = db_find_callable_verb(location, "huh"),
vh.ptr))) {
do_input_task(tq->player, pc, this, vh);
} else {
notify(tq->player, "I couldn't understand that.");
tq->last_input_task_id = 0;
}
if (tq->output_suffix)
notify(tq->player, tq->output_suffix);
free_var(result);
}
free_parsed_command(pc);
}
return 1;
}
static int
do_login_task(tqueue * tq, char *command)
{
Var result;
Var args;
Objid old_max_object = db_last_used_objid();
result.type = TYPE_INT; /* In case #0:do_login_command does not exist
* or does not immediately return.
*/
args = parse_into_wordlist(command);
run_server_task_setting_id(tq->player, tq->handler, "do_login_command",
args, command, &result,
&(tq->last_input_task_id));
if (tq->connected && result.type == TYPE_OBJ && is_user(result.v.obj)) {
Objid new_player = result.v.obj;
Objid old_player = tq->player;
tqueue *dead_tq = find_tqueue(new_player, 0);
task *t;
tq->player = new_player;
if (tq->num_bg_tasks) {
/* Cute; this un-logged-in connection has some queued tasks!
* Must copy them over to their own tqueue for accounting...
*/
tqueue *old_tq = find_tqueue(old_player, 1);
old_tq->num_bg_tasks = tq->num_bg_tasks;
while ((t = dequeue_bg_task(tq)) != 0)
enqueue_bg_task(old_tq, t);
tq->num_bg_tasks = 0;
}
if (dead_tq) { /* Copy over tasks from old queue for player */
tq->num_bg_tasks = dead_tq->num_bg_tasks;
while ((t = dequeue_any_task(dead_tq)) != 0) {
if (t->kind == TASK_INPUT)
free_task(t, 0);
else /* FORKED or SUSPENDED */
enqueue_bg_task(tq, t);
}
dead_tq->player = NOTHING; /* it'll be freed by run_ready_tasks */
dead_tq->num_bg_tasks = 0;
}
player_connected(old_player, new_player, new_player > old_max_object);
}
free_var(result);
return 1;
}
static void
do_out_of_band_command(tqueue * tq, char *command)
{
run_server_task(tq->player, tq->handler, "do_out_of_band_command",
parse_into_wordlist(command), command, 0);
}
static int
is_out_of_input(tqueue * tq)
{
return !tq->connected && !tq->first_input;
}
/*
* Exported interface
*/
task_queue
new_task_queue(Objid player, Objid handler)
{
task_queue result;
tqueue *tq = result.ptr = find_tqueue(player, 1);
tq->connected = 1;
tq->handler = handler;
return result;
}
void
free_task_queue(task_queue q)
{
tqueue *tq = (tqueue *) q.ptr;
tq->connected = 0;
/* Activate this queue to ensure that the pending read()ing task will
* eventually get resumed, even if there's no more input for it.
*/
if (tq->reading)
ensure_usage(tq);
}
int
tasks_set_connection_option(task_queue q, const char *option, Var value)
{
tqueue *tq = q.ptr;
if (!mystrcasecmp(option, "flush-command")) {
if (tq->flush_cmd)
free_str(tq->flush_cmd);
if (value.type == TYPE_STR && value.v.str[0] != '\0')
tq->flush_cmd = str_ref(value.v.str);
else
tq->flush_cmd = 0;
return 1;
}
if (!mystrcasecmp(option, "hold-input")) {
tq->hold_input = is_true(value);
if (!tq->hold_input && tq->first_input) /* Anything to be done? */
ensure_usage(tq);
return 1;
}
return 0;
}
int
tasks_connection_option(task_queue q, const char *option, Var * value)
{
tqueue *tq = q.ptr;
if (!mystrcasecmp(option, "flush-command")) {
value->type = TYPE_STR;
value->v.str = (tq->flush_cmd ? str_ref(tq->flush_cmd) : str_dup(""));
return 1;
}
if (!mystrcasecmp(option, "hold-input")) {
value->type = TYPE_INT;
value->v.num = tq->hold_input;
return 1;
}
return 0;
}
Var
tasks_connection_options(task_queue q, Var list)
{
tqueue *tq = q.ptr;
Var pair;
pair = new_list(2);
pair.v.list[1].type = TYPE_STR;
pair.v.list[1].v.str = str_dup("flush-command");
pair.v.list[2].type = TYPE_STR;
pair.v.list[2].v.str = (tq->flush_cmd ? str_ref(tq->flush_cmd)
: str_dup(""));
list = listappend(list, pair);
pair = new_list(2);
pair.v.list[1].type = TYPE_STR;
pair.v.list[1].v.str = str_dup("hold-input");
pair.v.list[2].type = TYPE_INT;
pair.v.list[2].v.num = tq->hold_input;
list = listappend(list, pair);
return list;
}
static void
enqueue_input_task(tqueue * tq, const char *input, int at_front)
{
task *t;
t = (task *) mymalloc(sizeof(task), M_TASK);
t->kind = TASK_INPUT;
t->t.input.string = str_dup(input);
tq->total_input_length += (t->t.input.length = strlen(input));
if (at_front && tq->first_input) { /* if nothing there, front == back */
t->next = tq->first_input;
tq->first_input = t;
} else {
*(tq->last_input) = t;
tq->last_input = &(t->next);
t->next = 0;
}
if (!tq->hold_input || tq->reading) /* Anything to do with this line? */
ensure_usage(tq);
if (!tq->input_suspended
&& tq->connected
&& tq->total_input_length > INPUT_HIWAT) {
server_suspend_input(tq->player);
tq->input_suspended = 1;
}
}
static void
flush_input(tqueue * tq, int show_messages)
{
if (tq->first_input) {
Stream *s = new_stream(100);
task *t;
if (show_messages)
notify(tq->player, ">> Flushing the following pending input:");
while ((t = dequeue_input_task(tq)) != 0) {
if (show_messages) {
stream_printf(s, ">> %s", t->t.input.string);
notify(tq->player, reset_stream(s));
}
free_task(t, 1);
}
if (show_messages)
notify(tq->player, ">> (Done flushing)");
} else if (show_messages)
notify(tq->player, ">> No pending input to flush...");
}
void
new_input_task(task_queue q, const char *input)
{
tqueue *tq = q.ptr;
if (tq->flush_cmd && mystrcasecmp(input, tq->flush_cmd) == 0) {
flush_input(tq, 1);
return;
}
enqueue_input_task(tq, input, 0);
}
static void
enqueue_waiting(task * t)
{ /* either FORKED or SUSPENDED */
time_t start_time = GET_START_TIME(t);
Objid progr = (t->kind == TASK_FORKED
? t->t.forked.a.progr
: progr_of_cur_verb(t->t.suspended.the_vm));
tqueue *tq = find_tqueue(progr, 1);
tq->num_bg_tasks++;
if (!waiting_tasks || start_time < GET_START_TIME(waiting_tasks)) {
t->next = waiting_tasks;
waiting_tasks = t;
} else {
task *tt;
for (tt = waiting_tasks; tt->next; tt = tt->next)
if (start_time < GET_START_TIME(tt->next))
break;
t->next = tt->next;
tt->next = t;
}
}
static void
enqueue_ft(Program * program, activation a, Var * rt_env,
int f_index, time_t start_time, int id)
{
task *t = (task *) mymalloc(sizeof(task), M_TASK);
t->kind = TASK_FORKED;
t->t.forked.program = program;
t->t.forked.a = a;
t->t.forked.rt_env = rt_env;
t->t.forked.f_index = f_index;
t->t.forked.start_time = start_time;
t->t.forked.id = id;
enqueue_waiting(t);
}
static int
check_user_task_limit(Objid user)
{
tqueue *tq = find_tqueue(user, 0);
int limit = -1;
Var v;
if (valid(user)
&& db_find_property(user, "queued_task_limit", &v).ptr
&& v.type == TYPE_INT)
limit = v.v.num;
if (limit < 0)
limit = server_int_option("queued_task_limit", -1);
if (limit < 0)
return 1;
else if ((tq ? tq->num_bg_tasks : 0) >= limit)
return 0;
else
return 1;
}
enum error
enqueue_forked_task2(activation a, int f_index, unsigned after_seconds, int vid)
{
int id;
Var *rt_env;
if (!check_user_task_limit(a.progr))
return E_QUOTA;
id = new_task_id();
a.verb = str_ref(a.verb);
a.verbname = str_ref(a.verbname);
a.prog = program_ref(a.prog);
if (vid >= 0) {
free_var(a.rt_env[vid]);
a.rt_env[vid].type = TYPE_INT;
a.rt_env[vid].v.num = id;
}
rt_env = copy_rt_env(a.rt_env, a.prog->num_var_names);
enqueue_ft(a.prog, a, rt_env, f_index, time(0) + after_seconds, id);
return E_NONE;
}
enum error
enqueue_suspended_task(vm the_vm, void *data)
{
int after_seconds = *((int *) data);
int now = time(0);
int when;
task *t;
if (check_user_task_limit(progr_of_cur_verb(the_vm))) {
t = mymalloc(sizeof(task), M_TASK);
t->kind = TASK_SUSPENDED;
t->t.suspended.the_vm = the_vm;
if (now + after_seconds < now)
/* overflow or suspend `forever' code */
when = INT32_MAX;
else
when = now + after_seconds;
t->t.suspended.start_time = when;
t->t.suspended.value = zero;
enqueue_waiting(t);
return E_NONE;
} else
return E_QUOTA;
}
void
resume_task(vm the_vm, Var value)
{
task *t = mymalloc(sizeof(task), M_TASK);
Objid progr = progr_of_cur_verb(the_vm);
tqueue *tq = find_tqueue(progr, 1);
t->kind = TASK_SUSPENDED;
t->t.suspended.the_vm = the_vm;
t->t.suspended.start_time = 0; /* ready now */
t->t.suspended.value = value;
enqueue_bg_task(tq, t);
ensure_usage(tq);
}
Var
read_input_now(Objid connection)
{
tqueue *tq = find_tqueue(connection, 0);
task *t;
Var r;
if (!tq || is_out_of_input(tq)) {
r.type = TYPE_ERR;
r.v.err = E_INVARG;
} else if (!(t = dequeue_input_task(tq))) {
r.type = TYPE_INT;
r.v.num = 0;
} else {
r.type = TYPE_STR;
r.v.str = t->t.input.string;
myfree(t, M_TASK);
}
return r;
}
enum error
make_reading_task(vm the_vm, void *data)
{
Objid player = *((Objid *) data);
tqueue *tq = find_tqueue(player, 0);
if (!tq || tq->reading || is_out_of_input(tq))
return E_INVARG;
else {
tq->reading = 1;
tq->reading_vm = the_vm;
if (tq->first_input) /* Anything to read? */
ensure_usage(tq);
return E_NONE;
}
}
int
last_input_task_id(Objid player)
{
tqueue *tq = find_tqueue(player, 0);
return tq ? tq->last_input_task_id : 0;
}
int
next_task_start(void)
{
tqueue *tq;
for (tq = active_tqueues; tq; tq = tq->next)
if (tq->first_input != 0 || tq->first_bg != 0)
return 0;
if (waiting_tasks != 0) {
int wait = (waiting_tasks->kind == TASK_FORKED
? waiting_tasks->t.forked.start_time
: waiting_tasks->t.suspended.start_time) - time(0);
return (wait >= 0) ? wait : 0;
}
return -1;
}
void
run_ready_tasks(void)
{
task *t, *next_t;
time_t now = time(0);
tqueue *tq, *next_tq;
for (t = waiting_tasks; t && GET_START_TIME(t) <= now; t = next_t) {
Objid progr = (t->kind == TASK_FORKED
? t->t.forked.a.progr
: progr_of_cur_verb(t->t.suspended.the_vm));
tqueue *tq = find_tqueue(progr, 1);
next_t = t->next;
ensure_usage(tq);
enqueue_bg_task(tq, t);
}
waiting_tasks = t;
{
int did_one = 0;
time_t start = time(0);
static char oob_prefix[] = OUT_OF_BAND_PREFIX;
while (active_tqueues && !did_one) {
/* Loop over tqueues, looking for a task */
tq = active_tqueues;
if (tq->reading && is_out_of_input(tq)) {
Var v;
tq->reading = 0;
current_task_id = tq->reading_vm->task_id;
v.type = TYPE_ERR;
v.v.err = E_INVARG;
resume_from_previous_vm(tq->reading_vm, v, TASK_INPUT, 0);
did_one = 1;
}
while (!did_one) { /* Loop over tasks, looking for runnable one */
if (tq->hold_input && !tq->reading)
t = dequeue_bg_task(tq);
else
t = dequeue_any_task(tq);