/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
- * Ken Stevens, Steve McClure
+ * Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Ken Stevens, Steve McClure, Markus Armbruster
*
- * This program is free software; you can redistribute it and/or modify
+ * Empire 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 of the License, or
+ * the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* ---
*
* io.c: Arrange for input and output on a file descriptor to be queued.
*
* Known contributors to this file:
- * Doug Hay, 1998
- * Steve McClure, 1998
- * Ron Koenderink, 2009
+ * Doug Hay, 1998
+ * Steve McClure, 1998
+ * Markus Armbruster, 2004-2010
+ * Ron Koenderink, 2009
*/
/*
#include <unistd.h>
#include "empio.h"
#include "empthread.h"
+#include "file.h"
#include "ioqueue.h"
#include "misc.h"
#include "queue.h"
-#include "server.h"
struct iop {
int fd;
struct ioqueue *output;
int flags;
int bufsize;
+ int last_out;
struct timeval input_timeout;
};
iop->input = NULL;
iop->output = NULL;
iop->flags = flags;
+ iop->last_out = 0;
iop->bufsize = bufsize;
iop->input_timeout = timeout;
if (flags & IO_READ)
/*
* Write output queued in IOP.
- * If WAITFOROUTPUT != IO_NOWAIT, writing may put the thread to sleep.
+ * If WAIT, writing may put the thread to sleep.
* Return number of bytes written on success, -1 on error.
* In particular, return zero when nothing was written because the
* queue was empty, or because the write slept and got woken up (only
- * if WAITFOROUTPUT != IO_NOWAIT), or because the write refused to
- * sleep (only if WAITFOROUTPUT == IO_NOWAIT).
+ * if WAIT), or because the write refused to sleep (only if !WAIT).
*/
int
-io_output(struct iop *iop, int waitforoutput)
+io_output(struct iop *iop, int wait)
{
struct iovec iov[16];
int n, res, cc;
+ if (wait)
+ ef_make_stale();
+
if (!ioq_qsize(iop->output))
return 0;
if (iop->flags & IO_ERROR)
return -1;
- n = ioq_makeiov(iop->output, iov, IO_BUFSIZE);
-
- if (waitforoutput != IO_NOWAIT) {
+ if (wait) {
res = empth_select(iop->fd, EMPTH_FD_WRITE, NULL);
if (res == 0)
return 0;
}
}
+ n = ioq_makeiov(iop->output, iov, IO_BUFSIZE);
cc = writev(iop->fd, iov, n);
if (cc < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK)
}
ioq_dequeue(iop->output, cc);
+ iop->last_out = ioq_qsize(iop->output);
return cc;
}
+/*
+ * Write output queued in IOP if enough have been enqueued.
+ * Write if at least one buffer has been filled since the last write.
+ * If WAIT, writing may put the thread to sleep.
+ * Return number of bytes written on success, -1 on error.
+ * In particular, return zero when nothing was written because the
+ * queue was not long, or the write slept and got woken up (only if
+ * WAIT), or the write refused to sleep (only if !WAIT).
+ */
+int
+io_output_if_queue_long(struct iop *iop, int wait)
+{
+ int len = ioq_qsize(iop->output);
+
+ if (CANT_HAPPEN(iop->last_out > len))
+ iop->last_out = 0;
+ if (len - iop->last_out < iop->bufsize) {
+ if (wait)
+ ef_make_stale();
+ return 0;
+ }
+ return io_output(iop, wait);
+}
+
+
int
io_peek(struct iop *iop, char *buf, int nbytes)
{
}
int
-io_write(struct iop *iop, char *buf, int nbytes, int doWait)
+io_write(struct iop *iop, char *buf, int nbytes)
{
- int len;
-
if ((iop->flags & IO_WRITE) == 0)
return -1;
ioq_append(iop->output, buf, nbytes);
- len = ioq_qsize(iop->output);
- if (len > iop->bufsize) {
- if (doWait) {
- io_output_all(iop);
- } else {
- /* only try a write every BUFSIZE characters */
- if (((len - nbytes) % iop->bufsize) < (len % iop->bufsize))
- io_output(iop, IO_NOWAIT);
- }
- }
return nbytes;
}
-int
-io_output_all(struct iop *iop)
-{
- int n;
-
- /*
- * Mustn't block a player thread while update is pending, or else
- * a malicous player could delay the update indefinitely
- */
- while ((n = io_output(iop, IO_NOWAIT)) > 0 && !play_wrlock_wanted)
- empth_select(iop->fd, EMPTH_FD_WRITE, NULL);
-
- return n;
-}
-
int
io_gets(struct iop *iop, char *buf, int nbytes)
{
if (flags & IO_WRITE) {
shutdown(iop->fd, 1);
ioq_drain(iop->output);
+ iop->last_out = 0;
}
return 0;
}