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/* Copyright (c) 1993-2002
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Copyright (c) 1987 Oliver Laumann
*
* This program 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.
*
* This program 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 this program (see the file COPYING); if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
****************************************************************
*/
#include "rcs.h"
RCS_ID("$Id: sched.c,v 1.24 1994/09/06 17:00:20 mlschroe Exp $ FAU")
#include <sys/types.h>
#if !defined(sun) && !defined(B43) && !defined(ISC) && !defined(pyr) && !defined(_CX_UX)
# include <time.h>
#endif
#include <sys/time.h>
#include "config.h"
#include "screen.h"
#include "extern.h"
static struct event *evs;
static struct event *tevs;
static struct event *nextev;
static int calctimeout;
static struct event *calctimo __P((void));
#if (defined(sgi) && defined(SVR4)) || defined(__osf__)
static int sgihack __P((void));
#endif
void
evenq(ev)
struct event *ev;
{
struct event *evp, **evpp;
debug3("New event fd %d type %d queued %d\n", ev->fd, ev->type, ev->queued);
if (ev->queued)
return;
evpp = &evs;
if (ev->type == EV_TIMEOUT)
{
calctimeout = 1;
evpp = &tevs;
}
for (; (evp = *evpp); evpp = &evp->next)
if (ev->pri > evp->pri)
break;
ev->next = evp;
*evpp = ev;
ev->queued = 1;
}
void
evdeq(ev)
struct event *ev;
{
struct event *evp, **evpp;
debug3("Deq event fd %d type %d queued %d\n", ev->fd, ev->type, ev->queued);
if (!ev->queued)
return;
evpp = &evs;
if (ev->type == EV_TIMEOUT)
{
calctimeout = 1;
evpp = &tevs;
}
for (; (evp = *evpp); evpp = &evp->next)
if (evp == ev)
break;
ASSERT(evp);
*evpp = ev->next;
ev->queued = 0;
if (ev == nextev)
nextev = nextev->next;
}
static struct event *
calctimo()
{
struct event *ev, *min;
long mins;
if ((min = tevs) == 0)
return 0;
mins = min->timeout.tv_sec;
for (ev = tevs->next; ev; ev = ev->next)
{
ASSERT(ev->type == EV_TIMEOUT);
if (mins < ev->timeout.tv_sec)
continue;
if (mins > ev->timeout.tv_sec || min->timeout.tv_usec > ev->timeout.tv_usec)
{
min = ev;
mins = ev->timeout.tv_sec;
}
}
return min;
}
void
sched()
{
struct event *ev;
fd_set r, w, *set;
struct event *timeoutev = 0;
struct timeval timeout;
int nsel;
for (;;)
{
if (calctimeout)
timeoutev = calctimo();
if (timeoutev)
{
gettimeofday(&timeout, NULL);
/* tp - timeout */
timeout.tv_sec = timeoutev->timeout.tv_sec - timeout.tv_sec;
timeout.tv_usec = timeoutev->timeout.tv_usec - timeout.tv_usec;
if (timeout.tv_usec < 0)
{
timeout.tv_usec += 1000000;
timeout.tv_sec--;
}
if (timeout.tv_sec < 0)
{
timeout.tv_usec = 0;
timeout.tv_sec = 0;
}
}
#ifdef DEBUG
debug("waiting for events");
if (timeoutev)
debug2(" timeout %d secs %d usecs", timeout.tv_sec, timeout.tv_usec);
debug(":\n");
for (ev = evs; ev; ev = ev->next)
debug3(" - fd %d type %d pri %d\n", ev->fd, ev->type, ev->pri);
if (tevs)
debug("timed events:\n");
for (ev = tevs; ev; ev = ev->next)
debug3(" - pri %d sec %d usec %d\n", ev->pri, ev->timeout.tv_sec, ev->timeout.tv_usec);
#endif
FD_ZERO(&r);
FD_ZERO(&w);
for (ev = evs; ev; ev = ev->next)
{
if (ev->condpos && *ev->condpos <= (ev->condneg ? *ev->condneg : 0))
{
debug2(" - cond ev fd %d type %d failed\n", ev->fd, ev->type);
continue;
}
if (ev->type == EV_READ)
FD_SET(ev->fd, &r);
else if (ev->type == EV_WRITE)
FD_SET(ev->fd, &w);
}
#ifdef DEBUG
debug("readfds:");
for (nsel = 0; nsel < FD_SETSIZE; nsel++)
if (FD_ISSET(nsel, &r))
debug1(" %d", nsel);
debug("\n");
debug("writefds:");
for (nsel = 0; nsel < FD_SETSIZE; nsel++)
if (FD_ISSET(nsel, &w))
debug1(" %d", nsel);
debug("\n");
#endif
nsel = select(FD_SETSIZE, &r, &w, (fd_set *)0, timeoutev ? &timeout : (struct timeval *) 0);
if (nsel < 0)
{
if (errno != EINTR)
{
#if defined(sgi) && defined(SVR4)
if (errno == EIO && sgihack())
continue;
#endif
#ifdef __osf__
/* OSF/1 3.x bug: EBADF */
/* OSF/1 4.x bug: EIO */
if ((errno == EIO || errno == EBADF) && sgihack())
continue;
#endif
Panic(errno, "select");
}
nsel = 0;
}
else if (nsel == 0) /* timeout */
{
debug("TIMEOUT!\n");
ASSERT(timeoutev);
evdeq(timeoutev);
timeoutev->handler(timeoutev, timeoutev->data);
}
#ifdef SELECT_BROKEN
/*
* Sequents select emulation counts a descriptor which is
* readable and writeable only as one hit. Waaaaa.
*/
if (nsel)
nsel = 2 * FD_SETSIZE;
#endif
for (ev = evs; ev; ev = nextev)
{
nextev = ev->next;
if (ev->type != EV_ALWAYS)
{
set = ev->type == EV_READ ? &r : &w;
if (nsel == 0 || !FD_ISSET(ev->fd, set))
continue;
nsel--;
}
if (ev->condpos && *ev->condpos <= (ev->condneg ? *ev->condneg : 0))
continue;
debug2(" + hit ev fd %d type %d!\n", ev->fd, ev->type);
ev->handler(ev, ev->data);
}
}
}
void
SetTimeout(ev, timo)
struct event *ev;
int timo;
{
ASSERT(ev->type == EV_TIMEOUT);
debug2("event %x new timeout %d ms\n", ev, timo);
gettimeofday(&ev->timeout, NULL);
ev->timeout.tv_sec += timo / 1000;
ev->timeout.tv_usec += (timo % 1000) * 1000;
if (ev->timeout.tv_usec > 1000000)
{
ev->timeout.tv_usec -= 1000000;
ev->timeout.tv_sec++;
}
if (ev->queued)
calctimeout = 1;
}
#if (defined(sgi) && defined(SVR4)) || defined(__osf__)
extern struct display *display, *displays;
static int sgihack()
{
fd_set r, w;
struct timeval tv;
debug("IRIX5.2 workaround: searching for bad display\n");
for (display = displays; display; )
{
FD_ZERO(&r);
FD_ZERO(&w);
FD_SET(D_userfd, &r);
FD_SET(D_userfd, &w);
tv.tv_sec = tv.tv_usec = 0;
if (select(FD_SETSIZE, &r, &w, (fd_set *)0, &tv) == -1)
{
if (errno == EINTR)
continue;
Hangup(); /* goodbye display */
return 1;
}
display = display->d_next;
}
return 0;
}
#endif
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