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-rw-r--r--sched.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/sched.c b/sched.c
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+/* Copyright (c) 2008, 2009
+ * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Micah Cowan (micah@cowan.name)
+ * Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
+ * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
+ * 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 3, 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, see
+ * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
+ *
+ ****************************************************************
+ */
+
+#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__) || defined(M_UNIX)
+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
+#if defined(__osf__) || defined(M_UNIX)
+ /* OSF/1 3.x, SCO 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__) || defined(M_UNIX)
+
+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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