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+/*
+ * Copyright 2012 William Pitcock <nenolod@dereferenced.org>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/*
+ * Copyright 2003 Niels Provos <provos@citi.umich.edu>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * Mon 03/10/2003 - Modified by Davide Libenzi <davidel@xmailserver.org>
+ *
+ * Added chain event propagation to improve the sensitivity of
+ * the measure respect to the event loop efficency.
+ *
+ *
+ */
+
+#define timersub(tvp, uvp, vvp) \
+ do { \
+ (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
+ (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
+ if ((vvp)->tv_usec < 0) { \
+ (vvp)->tv_sec--; \
+ (vvp)->tv_usec += 1000000; \
+ } \
+ } while (0)
+
+#include <mowgli.h>
+
+
+static int count, writes, fired;
+static mowgli_eventloop_t *base_eventloop;
+static mowgli_descriptor_t *pipes;
+static int num_pipes, num_active, num_writes;
+static mowgli_eventloop_pollable_t **events;
+static int timers;
+
+void
+timer_cb(void *unused)
+{
+ /* nop */
+}
+
+void
+read_cb(mowgli_eventloop_t *eventloop, mowgli_eventloop_io_t *io, mowgli_eventloop_io_dir_t dir, void *arg)
+{
+ mowgli_eventloop_pollable_t *pollable = mowgli_eventloop_io_pollable(io);
+ int idx = (int) (long) arg, widx = idx + 1;
+ u_char ch;
+
+ count += read(pollable->fd, &ch, sizeof(ch));
+ if (writes) {
+ if (widx >= num_pipes)
+ widx -= num_pipes;
+ write(pipes[2 * widx + 1], "e", 1);
+ writes--;
+ fired++;
+ }
+}
+
+#if NATIVE
+void
+read_thunk(struct ev_io *w, int revents)
+{
+ read_cb (w->fd, revents, w->data);
+}
+
+void
+timer_cb (struct ev_timer *w, int revents)
+{
+ /* nop */
+}
+#endif
+
+struct timeval *
+run_once(void)
+{
+ int *cp, i, space;
+ static struct timeval ta, ts, te;
+
+ gettimeofday(&ta, NULL);
+ for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+ if (events[i] != NULL)
+ mowgli_pollable_destroy(base_eventloop, events[i]);
+
+ events[i] = mowgli_pollable_create(base_eventloop, cp[0], (void *) (long) i);
+ mowgli_pollable_setselect(base_eventloop, events[i], MOWGLI_EVENTLOOP_IO_READ, read_cb);
+ }
+
+ fired = 0;
+ space = num_pipes / num_active;
+ space = space * 2;
+ for (i = 0; i < num_active; i++, fired++)
+ write(pipes[i * space + 1], "e", 1);
+
+ count = 0;
+ writes = num_writes;
+
+ int xcount = 0;
+ gettimeofday(&ts, NULL);
+ do {
+ mowgli_eventloop_run_once(base_eventloop);
+ xcount++;
+ } while (count != fired);
+
+ gettimeofday(&te, NULL);
+
+ timersub(&te, &ta, &ta);
+ timersub(&te, &ts, &ts);
+ fprintf(stdout, "%ld\t%ld\n",
+ ta.tv_sec * 1000000L + ta.tv_usec,
+ ts.tv_sec * 1000000L + ts.tv_usec
+ );
+
+ return (&te);
+}
+
+int
+main (int argc, char **argv)
+{
+ struct rlimit rl;
+ int i, c;
+ int *cp;
+ extern char *optarg;
+
+ num_pipes = 100;
+ num_active = 1;
+ num_writes = num_pipes;
+ while ((c = getopt(argc, argv, "n:a:w:te")) != -1) {
+ switch (c) {
+ case 'n':
+ num_pipes = atoi(optarg);
+ break;
+ case 'a':
+ num_active = atoi(optarg);
+ break;
+ case 'w':
+ num_writes = atoi(optarg);
+ break;
+ case 't':
+ timers = 1;
+ break;
+ default:
+ fprintf(stderr, "Illegal argument \"%c\"\n", c);
+ exit(1);
+ }
+ }
+
+#if 1
+ rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
+ if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
+ perror("setrlimit");
+ }
+#endif
+
+ events = calloc(num_pipes * 2, sizeof(mowgli_eventloop_pollable_t *));
+ pipes = calloc(num_pipes * 2, sizeof(mowgli_descriptor_t));
+ if (events == NULL || pipes == NULL) {
+ perror("malloc");
+ exit(1);
+ }
+
+ mowgli_thread_set_policy(MOWGLI_THREAD_POLICY_DISABLED);
+ base_eventloop = mowgli_eventloop_create();
+
+ for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+#ifdef USE_PIPES
+ if (pipe(cp) == -1) {
+#else
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
+#endif
+ perror("pipe");
+ exit(1);
+ }
+ }
+
+ for (i = 0; i < 2; i++) {
+ run_once();
+ }
+
+ exit(0);
+}