#include <config.h>
#include <lisp.h>
#include <signal.h>
#include <syssignal.h>
#include <systime.h>
#include <blockinput.h>
#include <atimer.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#define max(X, Y) ((X) > (Y) ? (X) : (Y))
#define min(X, Y) ((X) < (Y) ? (X) : (Y))
static struct atimer *free_atimers;
static struct atimer *stopped_atimers;
static struct atimer *atimers;
int pending_atimers;
#define BLOCK_ATIMERS sigblock (sigmask (SIGALRM))
#define UNBLOCK_ATIMERS sigunblock (sigmask (SIGALRM))
static void set_alarm P_ ((void));
static void schedule_atimer P_ ((struct atimer *));
static struct atimer *append_atimer_lists P_ ((struct atimer *,
struct atimer *));
SIGTYPE alarm_signal_handler ();
struct atimer *
start_atimer (type, time, fn, client_data)
enum atimer_type type;
EMACS_TIME time;
atimer_callback fn;
void *client_data;
{
struct atimer *t;
#ifndef HAVE_SETITIMER
if (EMACS_USECS (time) != 0)
{
EMACS_SET_USECS (time, 0);
EMACS_SET_SECS (time, EMACS_SECS (time) + 1);
}
#endif
if (free_atimers)
{
t = free_atimers;
free_atimers = t->next;
}
else
t = (struct atimer *) xmalloc (sizeof *t);
bzero (t, sizeof *t);
t->type = type;
t->fn = fn;
t->client_data = client_data;
BLOCK_ATIMERS;
switch (type)
{
case ATIMER_ABSOLUTE:
t->expiration = time;
break;
case ATIMER_RELATIVE:
EMACS_GET_TIME (t->expiration);
EMACS_ADD_TIME (t->expiration, t->expiration, time);
break;
case ATIMER_CONTINUOUS:
EMACS_GET_TIME (t->expiration);
EMACS_ADD_TIME (t->expiration, t->expiration, time);
t->interval = time;
break;
}
schedule_atimer (t);
UNBLOCK_ATIMERS;
set_alarm ();
return t;
}
void
cancel_atimer (timer)
struct atimer *timer;
{
int i;
BLOCK_ATIMERS;
for (i = 0; i < 2; ++i)
{
struct atimer *t, *prev;
struct atimer **list = i ? &stopped_atimers : &atimers;
for (t = *list, prev = NULL; t && t != timer; prev = t, t = t->next)
;
if (t)
{
if (prev)
prev->next = t->next;
else
*list = t->next;
t->next = free_atimers;
free_atimers = t;
break;
}
}
UNBLOCK_ATIMERS;
}
static struct atimer *
append_atimer_lists (list1, list2)
struct atimer *list1, *list2;
{
if (list1 == NULL)
return list2;
else if (list2 == NULL)
return list1;
else
{
struct atimer *p;
for (p = list1; p->next; p = p->next)
;
p->next = list2;
return list1;
}
}
void
stop_other_atimers (t)
struct atimer *t;
{
BLOCK_ATIMERS;
if (t)
{
struct atimer *p, *prev;
for (p = atimers, prev = 0; p && p != t; p = p->next)
;
if (p == t)
{
if (prev)
prev->next = t->next;
else
atimers = t->next;
t->next = NULL;
}
else
t = NULL;
}
stopped_atimers = append_atimer_lists (atimers, stopped_atimers);
atimers = t;
UNBLOCK_ATIMERS;
}
void
run_all_atimers ()
{
if (stopped_atimers)
{
struct atimer *t = atimers;
struct atimer *next;
BLOCK_ATIMERS;
atimers = stopped_atimers;
stopped_atimers = NULL;
while (t)
{
next = t->next;
schedule_atimer (t);
t = next;
}
UNBLOCK_ATIMERS;
}
}
Lisp_Object
unwind_stop_other_atimers (dummy)
Lisp_Object dummy;
{
run_all_atimers ();
return Qnil;
}
static void
set_alarm ()
{
#if defined (USG) && !defined (POSIX_SIGNALS)
signal (SIGALRM, alarm_signal_handler);
#endif
if (atimers)
{
EMACS_TIME now, time;
#ifdef HAVE_SETITIMER
struct itimerval it;
#endif
EMACS_GET_TIME (now);
EMACS_SUB_TIME (time, atimers->expiration, now);
#ifdef HAVE_SETITIMER
if (EMACS_TIME_LE (atimers->expiration, now))
{
EMACS_SET_SECS (time, 0);
EMACS_SET_USECS (time, 1000);
}
bzero (&it, sizeof it);
it.it_value = time;
setitimer (ITIMER_REAL, &it, 0);
#else
alarm (max (EMACS_SECS (time), 1));
#endif
}
}
static void
schedule_atimer (t)
struct atimer *t;
{
struct atimer *a = atimers, *prev = NULL;
while (a && EMACS_TIME_GT (t->expiration, a->expiration))
prev = a, a = a->next;
if (prev)
prev->next = t;
else
atimers = t;
t->next = a;
}
SIGTYPE
alarm_signal_handler (signo)
int signo;
{
EMACS_TIME now;
EMACS_GET_TIME (now);
pending_atimers = 0;
while (atimers
&& (pending_atimers = interrupt_input_blocked) == 0
&& EMACS_TIME_LE (atimers->expiration, now))
{
struct atimer *t;
t = atimers;
atimers = atimers->next;
t->fn (t);
if (t->type == ATIMER_CONTINUOUS)
{
EMACS_ADD_TIME (t->expiration, now, t->interval);
schedule_atimer (t);
}
else
{
t->next = free_atimers;
free_atimers = t;
}
EMACS_GET_TIME (now);
}
#if defined (USG) && !defined (POSIX_SIGNALS)
signal (SIGALRM, alarm_signal_handler);
#endif
set_alarm ();
}
void
do_pending_atimers ()
{
if (pending_atimers)
{
BLOCK_ATIMERS;
alarm_signal_handler (SIGALRM);
UNBLOCK_ATIMERS;
}
}
void
turn_on_atimers (on)
int on;
{
if (on)
{
signal (SIGALRM, alarm_signal_handler);
set_alarm ();
}
else
alarm (0);
}
void
init_atimer ()
{
free_atimers = atimers = NULL;
pending_atimers = 0;
signal (SIGALRM, alarm_signal_handler);
}