Add libevent

[netatalk.git] / libevent / test / bench_cascade.c

diff --git a/libevent/test/bench_cascade.c b/libevent/test/bench_cascade.c
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+++ b/libevent/test/bench_cascade.c
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+/*
+ * Copyright 2007-2010 Niels Provos and Nick Mathewson
+ *
+ * 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.
+ *
+ */
+
+#include "event2/event-config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <sys/socket.h>
+#include <sys/resource.h>
+#endif
+#include <signal.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <event.h>
+#include <evutil.h>
+
+/*
+ * This benchmark tests how quickly we can propagate a write down a chain
+ * of socket pairs.  We start by writing to the first socket pair and all
+ * events will fire subsequently until the last socket pair has been reached
+ * and the benchmark terminates.
+ */
+
+static int fired;
+static int *pipes;
+static struct event *events;
+
+static void
+read_cb(evutil_socket_t fd, short which, void *arg)
+{
+       char ch;
+       long idx = (long) arg;
+
+       recv(fd, &ch, sizeof(ch), 0);
+       if (idx >= 0)
+               send(idx, "e", 1, 0);
+       fired++;
+}
+
+static struct timeval *
+run_once(int num_pipes)
+{
+       int *cp, i;
+       static struct timeval ts, te, tv_timeout;
+
+       events = calloc(num_pipes, sizeof(struct event));
+       pipes = calloc(num_pipes * 2, sizeof(int));
+
+       if (events == NULL || pipes == NULL) {
+               perror("malloc");
+               exit(1);
+       }
+
+       for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+               if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
+                       perror("socketpair");
+                       exit(1);
+               }
+       }
+
+       /* measurements includes event setup */
+       gettimeofday(&ts, NULL);
+
+       /* provide a default timeout for events */
+       evutil_timerclear(&tv_timeout);
+       tv_timeout.tv_sec = 60;
+
+       for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+               long fd = i < num_pipes - 1 ? cp[3] : -1;
+               event_set(&events[i], cp[0], EV_READ, read_cb, (void *) fd);
+               event_add(&events[i], &tv_timeout);
+       }
+
+       fired = 0;
+
+       /* kick everything off with a single write */
+       send(pipes[1], "e", 1, 0);
+
+       event_dispatch();
+
+       gettimeofday(&te, NULL);
+       evutil_timersub(&te, &ts, &te);
+
+       for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+               event_del(&events[i]);
+               close(cp[0]);
+               close(cp[1]);
+       }
+
+       free(pipes);
+       free(events);
+
+       return (&te);
+}
+
+int
+main(int argc, char **argv)
+{
+#ifndef WIN32
+       struct rlimit rl;
+#endif
+       int i, c;
+       struct timeval *tv;
+
+       int num_pipes = 100;
+       while ((c = getopt(argc, argv, "n:")) != -1) {
+               switch (c) {
+               case 'n':
+                       num_pipes = atoi(optarg);
+                       break;
+               default:
+                       fprintf(stderr, "Illegal argument \"%c\"\n", c);
+                       exit(1);
+               }
+       }
+
+#ifndef WIN32
+       rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
+       if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
+               perror("setrlimit");
+               exit(1);
+       }
+#endif
+
+       event_init();
+
+       for (i = 0; i < 25; i++) {
+               tv = run_once(num_pipes);
+               if (tv == NULL)
+                       exit(1);
+               fprintf(stdout, "%ld\n",
+                       tv->tv_sec * 1000000L + tv->tv_usec);
+       }
+
+       exit(0);
+}