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diff --git a/libevent/test/bench.c b/libevent/test/bench.c
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+/*
+ * Copyright 2003-2007 Niels Provos <provos@citi.umich.edu>
+ * Copyright 2007-2012 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.
+ *
+ *
+ * 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.
+ *
+ *
+ */
+
+#include "event2/event-config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef _EVENT_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#else
+#include <sys/socket.h>
+#include <signal.h>
+#include <sys/resource.h>
+#endif
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#ifdef _EVENT_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <errno.h>
+
+#include <event.h>
+#include <evutil.h>
+
+static int count, writes, fired;
+static int *pipes;
+static int num_pipes, num_active, num_writes;
+static struct event *events;
+
+
+static void
+read_cb(evutil_socket_t fd, short which, void *arg)
+{
+       long idx = (long) arg, widx = idx + 1;
+       u_char ch;
+
+       count += recv(fd, (char*)&ch, sizeof(ch), 0);
+       if (writes) {
+               if (widx >= num_pipes)
+                       widx -= num_pipes;
+               send(pipes[2 * widx + 1], "e", 1, 0);
+               writes--;
+               fired++;
+       }
+}
+
+static struct timeval *
+run_once(void)
+{
+       int *cp, space;
+       long i;
+       static struct timeval ts, te;
+
+       for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+               if (event_initialized(&events[i]))
+                       event_del(&events[i]);
+               event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *) i);
+               event_add(&events[i], NULL);
+       }
+
+       event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
+
+       fired = 0;
+       space = num_pipes / num_active;
+       space = space * 2;
+       for (i = 0; i < num_active; i++, fired++)
+               send(pipes[i * space + 1], "e", 1, 0);
+
+       count = 0;
+       writes = num_writes;
+       { int xcount = 0;
+       evutil_gettimeofday(&ts, NULL);
+       do {
+               event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
+               xcount++;
+       } while (count != fired);
+       evutil_gettimeofday(&te, NULL);
+
+       if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
+       }
+
+       evutil_timersub(&te, &ts, &te);
+
+       return (&te);
+}
+
+int
+main(int argc, char **argv)
+{
+#ifndef WIN32
+       struct rlimit rl;
+#endif
+       int i, c;
+       struct timeval *tv;
+       int *cp;
+
+#ifdef WIN32
+       WSADATA WSAData;
+       WSAStartup(0x101, &WSAData);
+#endif
+       num_pipes = 100;
+       num_active = 1;
+       num_writes = num_pipes;
+       while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
+               switch (c) {
+               case 'n':
+                       num_pipes = atoi(optarg);
+                       break;
+               case 'a':
+                       num_active = atoi(optarg);
+                       break;
+               case 'w':
+                       num_writes = 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
+
+       events = calloc(num_pipes, sizeof(struct event));
+       pipes = calloc(num_pipes * 2, sizeof(int));
+       if (events == NULL || pipes == NULL) {
+               perror("malloc");
+               exit(1);
+       }
+
+       event_init();
+
+       for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
+#ifdef USE_PIPES
+               if (pipe(cp) == -1) {
+#else
+               if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
+#endif
+                       perror("pipe");
+                       exit(1);
+               }
+       }
+
+       for (i = 0; i < 25; i++) {
+               tv = run_once();
+               if (tv == NULL)
+                       exit(1);
+               fprintf(stdout, "%ld\n",
+                       tv->tv_sec * 1000000L + tv->tv_usec);
+       }
+
+       exit(0);
+}