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diff --git a/libevent/test/test-changelist.c b/libevent/test/test-changelist.c
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+/*
+ * Copyright (c) 2010-2012 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.
+ * 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.
+ */
+
+#include "event2/event-config.h"
+
+#ifdef _WIN32
+#include <winsock2.h>
+#include <windows.h>
+#else
+#include <unistd.h>
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef EVENT__HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#ifdef EVENT__HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include "event2/event.h"
+#include "event2/util.h"
+#include <time.h>
+
+struct cpu_usage_timer {
+#ifdef _WIN32
+ HANDLE thread;
+ FILETIME usertimeBegin;
+ FILETIME kerneltimeBegin;
+#else
+ clock_t ticksBegin;
+#endif
+ struct timeval timeBegin;
+};
+static void
+start_cpu_usage_timer(struct cpu_usage_timer *timer)
+{
+#ifdef _WIN32
+ int r;
+ FILETIME createtime, exittime;
+ timer->thread = GetCurrentThread();
+ r = GetThreadTimes(timer->thread, &createtime, &exittime,
+ &timer->usertimeBegin, &timer->kerneltimeBegin);
+ if (r==0) printf("GetThreadTimes failed.");
+#else
+ timer->ticksBegin = clock();
+#endif
+
+ evutil_gettimeofday(&timer->timeBegin, NULL);
+}
+#ifdef _WIN32
+static ev_int64_t
+filetime_to_100nsec(const FILETIME *ft)
+{
+ /* Number of 100-nanosecond units */
+ ev_int64_t n = ft->dwHighDateTime;
+ n <<= 32;
+ n += ft->dwLowDateTime;
+ return n;
+}
+static double
+filetime_diff(const FILETIME *ftStart, const FILETIME *ftEnd)
+{
+ ev_int64_t s, e, diff;
+ double r;
+ s = filetime_to_100nsec(ftStart);
+ e = filetime_to_100nsec(ftEnd);
+ diff = e - s;
+ r = (double) diff;
+ return r / 1.0e7;
+}
+#endif
+
+static void
+get_cpu_usage(struct cpu_usage_timer *timer, double *secElapsedOut,
+ double *secUsedOut, double *usageOut)
+{
+#ifdef _WIN32
+ double usertime_seconds, kerneltime_seconds;
+ FILETIME createtime, exittime, usertimeEnd, kerneltimeEnd;
+ int r;
+#else
+ clock_t ticksEnd;
+#endif
+ struct timeval timeEnd, timeDiff;
+ double secondsPassed, secondsUsed;
+
+#ifdef _WIN32
+ r = GetThreadTimes(timer->thread, &createtime, &exittime,
+ &usertimeEnd, &kerneltimeEnd);
+ if (r==0) printf("GetThreadTimes failed.");
+ usertime_seconds = filetime_diff(&timer->usertimeBegin, &usertimeEnd);
+ kerneltime_seconds = filetime_diff(&timer->kerneltimeBegin, &kerneltimeEnd);
+ secondsUsed = kerneltime_seconds + usertime_seconds;
+#else
+ ticksEnd = clock();
+ secondsUsed = (ticksEnd - timer->ticksBegin) / (double)CLOCKS_PER_SEC;
+#endif
+ evutil_gettimeofday(&timeEnd, NULL);
+ evutil_timersub(&timeEnd, &timer->timeBegin, &timeDiff);
+ secondsPassed = timeDiff.tv_sec + (timeDiff.tv_usec / 1.0e6);
+
+ *secElapsedOut = secondsPassed;
+ *secUsedOut = secondsUsed;
+ *usageOut = secondsUsed / secondsPassed;
+}
+
+static void
+write_cb(evutil_socket_t fd, short event, void *arg)
+{
+ printf("write callback. should only see this once\n");
+
+ /* got what we want remove the event */
+ event_del(*(struct event**)arg);
+
+ /* opps changed my mind add it back again */
+ event_add(*(struct event**)arg,NULL);
+
+ /* not a good day for decisiveness, I really didn't want it after all */
+ event_del(*(struct event**)arg);
+
+}
+
+static void
+timeout_cb(evutil_socket_t fd, short event, void *arg)
+{
+ printf("timeout fired, time to end test\n");
+ event_del(*(struct event**)arg);
+ return;
+}
+
+int
+main(int argc, char **argv)
+{
+ struct event* ev;
+ struct event* timeout;
+ struct event_base* base;
+
+ evutil_socket_t pair[2];
+ struct timeval tv;
+ struct cpu_usage_timer timer;
+
+ double usage, secPassed, secUsed;
+
+#ifdef _WIN32
+ WORD wVersionRequested;
+ WSADATA wsaData;
+
+ wVersionRequested = MAKEWORD(2, 2);
+
+ (void) WSAStartup(wVersionRequested, &wsaData);
+#endif
+ if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
+ return (1);
+
+ /* Initialize the event library */
+ if (!(base = event_base_new()))
+ return (1);
+
+ /* Initialize a timeout to terminate the test */
+ timeout = evtimer_new(base,timeout_cb,&timeout);
+ /* and watch for writability on one end of the pipe */
+ ev = event_new(base,pair[1],EV_WRITE | EV_PERSIST, write_cb, &ev);
+
+ tv.tv_sec = 1;
+ tv.tv_usec = 500*1000;
+
+ evtimer_add(timeout, &tv);
+
+ event_add(ev, NULL);
+
+ start_cpu_usage_timer(&timer);
+
+ event_base_dispatch(base);
+
+ event_free(ev);
+ event_free(timeout);
+ event_base_free(base);
+
+ get_cpu_usage(&timer, &secPassed, &secUsed, &usage);
+
+ /* attempt to calculate our cpu usage over the test should be
+ virtually nil */
+
+ printf("usec used=%d, usec passed=%d, cpu usage=%.2f%%\n",
+ (int)(secUsed*1e6),
+ (int)(secPassed*1e6),
+ usage*100);
+
+ if (usage > 50.0) /* way too high */
+ return 1;
+
+ return 0;
+}
+