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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 WIN32
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
# include <windows.h>
#endif
struct
{
HANDLE hNewWaitEvent;
long sleepTime;
}
alarms;
/* thread for precise alarm callbacks */
void CALLBACK
alarm_thread (unused)
LPVOID unused;
{
WaitForSingleObject (alarms.hNewWaitEvent, INFINITE);
for (;;)
{
int sleepTime;
sleepTime = alarms.sleepTime;
if (sleepTime > 0)
{
if (WaitForSingleObject (alarms.hNewWaitEvent, sleepTime) !=
WAIT_TIMEOUT)
{
/* The old wait was canceled by a new one */
continue;
}
}
raise (SIGALRM);
WaitForSingleObject (alarms.hNewWaitEvent, INFINITE);
}
}
void
_gst_init_sysdep_win32 ()
{
HANDLE hthread;
DWORD tid;
/* Starts as non-signaled, so alarm_thread will wait */
alarms.hNewWaitEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
/* Start alarm_thread with a 1024 bytes stack */
hthread = CreateThread (NULL,
1024,
(LPTHREAD_START_ROUTINE) alarm_thread,
NULL, 0, &tid);
/* This does not terminate the thread - it only releases our handle */
CloseHandle (hthread);
}
/* 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)
{
alarms.sleepTime = deltaMilli;
SetEvent (alarms.hNewWaitEvent);
}
}
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