/* Asynchronous timers.
- Copyright (C) 2000 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2002, 2003, 2004, 2005,
+ 2006 Free Software Foundation, Inc.
This file is part of GNU Emacs.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
#include <config.h>
-#include <lisp.h>
#include <signal.h>
+#include <stdio.h>
+#include <lisp.h>
#include <syssignal.h>
#include <systime.h>
#include <blockinput.h>
#include <atimer.h>
-#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#include <sys/time.h>
#endif
-/* The ubiquitous min/max macros. */
-
-#define max(X, Y) ((X) > (Y) ? (X) : (Y))
-#define min(X, Y) ((X) < (Y) ? (X) : (Y))
-
/* Free-list of atimer structures. */
static struct atimer *free_atimers;
int pending_atimers;
-/* Block/unblock SIGALRM.. */
+/* Block/unblock SIGALRM. */
#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 ();
/* Start a new atimer of type TYPE. TIME specifies when the timer is
{
struct atimer *t;
- /* May not be called when some timers are stopped. */
- if (stopped_atimers)
- abort ();
-
/* Round TIME up to the next full second if we don't have
itimers. */
#ifndef HAVE_SETITIMER
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);
/* Arrange for a SIGALRM at the time the next atimer is ripe. */
set_alarm ();
-
+
return t;
}
cancel_atimer (timer)
struct atimer *timer;
{
- struct atimer *t, *prev;
-
- /* May not be called when some timers are stopped. */
- if (stopped_atimers)
- abort ();
+ int i;
BLOCK_ATIMERS;
- /* See if TIMER is active. */
- for (t = atimers, prev = 0; t && t != timer; t = t->next)
- ;
-
- /* If it is, take it off the list of active timers, put in on the
- free-list. We don't bother to arrange for setting a different
- alarm time, since a too early one doesn't hurt. */
- if (t)
+ for (i = 0; i < 2; ++i)
{
- if (prev)
- prev->next = t->next;
- else
- atimers = t->next;
+ struct atimer *t, *prev;
+ struct atimer **list = i ? &stopped_atimers : &atimers;
+
+ /* See if TIMER is active or stopped. */
+ for (t = *list, prev = NULL; t && t != timer; prev = t, t = t->next)
+ ;
- t->next = free_atimers;
- free_atimers = t;
+ /* If it is, take it off the its list, and put in on the
+ free-list. We don't bother to arrange for setting a
+ different alarm time, since a too early one doesn't hurt. */
+ if (t)
+ {
+ if (prev)
+ prev->next = t->next;
+ else
+ *list = t->next;
+
+ t->next = free_atimers;
+ free_atimers = t;
+ break;
+ }
}
UNBLOCK_ATIMERS;
}
-/* Stop all timers except timer T. T null means stop all timers.
- This function may only be called when all timers are running. Two
- calls of this function in a row will lead to an abort. You may not
- call cancel_atimer or start_atimer while timers are stopped. */
+/* Append two lists of atimers LIST1 and LIST2 and return the
+ result list. */
+
+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;
+ }
+}
+
+
+/* Stop all timers except timer T. T null means stop all timers. */
void
stop_other_atimers (t)
struct atimer *t;
{
BLOCK_ATIMERS;
-
- if (stopped_atimers)
- abort ();
if (t)
{
- cancel_atimer (t);
- if (free_atimers != t)
- abort ();
- free_atimers = free_atimers->next;
- t->next = NULL;
+ struct atimer *p, *prev;
+
+ /* See if T is active. */
+ for (p = atimers, prev = NULL; p && p != t; prev = p, p = p->next)
+ ;
+
+ if (p == t)
+ {
+ if (prev)
+ prev->next = t->next;
+ else
+ atimers = t->next;
+ t->next = NULL;
+ }
+ else
+ /* T is not active. Let's handle this like T == 0. */
+ t = NULL;
}
-
- stopped_atimers = atimers;
+
+ stopped_atimers = append_atimer_lists (atimers, stopped_atimers);
atimers = t;
UNBLOCK_ATIMERS;
}
if (stopped_atimers)
{
struct atimer *t = atimers;
+ struct atimer *next;
+
BLOCK_ATIMERS;
atimers = stopped_atimers;
stopped_atimers = NULL;
- if (t)
- schedule_atimer (t);
+
+ while (t)
+ {
+ next = t->next;
+ schedule_atimer (t);
+ t = next;
+ }
+
UNBLOCK_ATIMERS;
}
}
must reestablish each time. */
signal (SIGALRM, alarm_signal_handler);
#endif /* USG */
-
+
if (atimers)
{
EMACS_TIME now, time;
EMACS_SET_SECS (time, 0);
EMACS_SET_USECS (time, 1000);
}
-
+
bzero (&it, sizeof it);
it.it_value = time;
setitimer (ITIMER_REAL, &it, 0);
prev->next = t;
else
atimers = t;
-
+
t->next = a;
}
int signo;
{
EMACS_TIME now;
-
+
+ SIGNAL_THREAD_CHECK (signo);
+
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;
+#ifndef MAC_OSX
t->fn (t);
-
+#endif
+
if (t->type == ATIMER_CONTINUOUS)
{
EMACS_ADD_TIME (t->expiration, now, t->interval);
t->next = free_atimers;
free_atimers = t;
}
-
+#ifdef MAC_OSX
+ /* Fix for Ctrl-G. Perhaps this should apply to all platforms. */
+ t->fn (t);
+#endif
+
EMACS_GET_TIME (now);
}
-
-#if defined (USG) && !defined (POSIX_SIGNALS)
- /* USG systems forget handlers when they are used;
- must reestablish each time. */
- signal (SIGALRM, alarm_signal_handler);
-#endif /* USG */
-
- set_alarm ();
+
+ if (! pending_atimers)
+ set_alarm ();
}
pending_atimers = 0;
signal (SIGALRM, alarm_signal_handler);
}
+
+/* arch-tag: e6308261-eec6-404b-89fb-6e5909518d70
+ (do not change this comment) */