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/******************************** -*- C -*- ****************************
*
* System specific implementation module.
*
* This module contains implementations of various operating system
* specific routines. This module should encapsulate most (or all)
* of these calls so that the rest of the code is portable.
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 1988,89,90,91,92,94,95,99,2000,2001,2002,2003,2006,2007,2008,2009
* Free Software Foundation, Inc.
* Written by Steve Byrne.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any later
* version.
*
* Linking GNU Smalltalk statically or dynamically with other modules is
* making a combined work based on GNU Smalltalk. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* In addition, as a special exception, the Free Software Foundation
* give you permission to combine GNU Smalltalk with free software
* programs or libraries that are released under the GNU LGPL and with
* independent programs running under the GNU Smalltalk virtual machine.
*
* You may copy and distribute such a system following the terms of the
* GNU GPL for GNU Smalltalk and the licenses of the other code
* concerned, provided that you include the source code of that other
* code when and as the GNU GPL requires distribution of source code.
*
* Note that people who make modified versions of GNU Smalltalk are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version without
* this exception; this exception also makes it possible to release a
* modified version which carries forward this exception.
*
* GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
***********************************************************************/
#include "gstpriv.h"
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif
/* Please feel free to make this more accurate for your operating system
* and send me the changes.
*/
void
_gst_signal_after (int deltaMilli,
SigHandler func,
int kind)
{
if (func)
_gst_set_signal_handler (kind, func);
if (deltaMilli <= 0)
{
raise (kind);
return;
}
#ifdef SIGVTALRM
if (kind == SIGVTALRM)
{
#if defined ITIMER_VIRTUAL
struct itimerval value;
value.it_interval.tv_sec = value.it_interval.tv_usec = 0;
value.it_value.tv_sec = deltaMilli / 1000;
value.it_value.tv_usec = (deltaMilli % 1000) * 1000;
setitimer (ITIMER_VIRTUAL, &value, (struct itimerval *) 0);
#endif
}
#endif
if (kind == SIGALRM)
{
#if defined ITIMER_REAL
struct itimerval value;
value.it_interval.tv_sec = value.it_interval.tv_usec = 0;
value.it_value.tv_sec = deltaMilli / 1000;
value.it_value.tv_usec = (deltaMilli % 1000) * 1000;
setitimer (ITIMER_REAL, &value, (struct itimerval *) 0);
#elif defined HAVE_FORK
static pid_t pid = -1;
long end, ticks;
if (pid != -1)
kill (pid, SIGTERM);
switch (pid = fork ())
{
case -1:
/* Error, try to recover */
raise (SIGALRM);
break;
case 0:
/* Child process */
end = _gst_get_milli_time () + deltaMilli;
do
{
ticks = end - _gst_get_milli_time ();
if (ticks > 1100) /* +100 is arbitrary */
sleep ((int) (ticks / 1000));
}
while (ticks > 0);
kill (getppid (), SIGALRM);
_exit (0);
}
#elif defined HAVE_ALARM
alarm (deltaMilli / 1000);
#else
/* Cannot do anything better than this */
raise (SIGALRM);
#endif
}
}
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