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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;
}