The Tor Browser: ipc/chromium/src/third_party/libevent/test/bench

ipc/chromium/src/third_party/libevent/test/bench_cascade.c@6474c204b198 (annotated)

ipc/chromium/src/third_party/libevent/test/bench_cascade.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * 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.
  *
  */
 #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 <sys/resource.h>
 #endif
 #include <signal.h>
 #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>
 /*
  * 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 evutil_socket_t *pipes;
 static struct event *events;
 static void
 read_cb(evutil_socket_t fd, short which, void *arg)
 {
 	char ch;
 	evutil_socket_t sock = (evutil_socket_t)(ev_intptr_t)arg;
 	recv(fd, &ch, sizeof(ch), 0);
 	if (sock >= 0) {
 		if (send(sock, "e", 1, 0) < 0)
 			perror("send");
 	}
 	fired++;
 }
 static struct timeval *
 run_once(int num_pipes)
 {
 	int i;
 	evutil_socket_t *cp;
 	static struct timeval ts, te, tv_timeout;
 	events = calloc(num_pipes, sizeof(struct event));
 	pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
 	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 */
 	evutil_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) {
 		evutil_socket_t fd = i < num_pipes - 1 ? cp[3] : -1;
 		event_set(&events[i], cp[0], EV_READ, read_cb,
 		    (void *)(ev_intptr_t)fd);
 		event_add(&events[i], &tv_timeout);
 	}
 	fired = 0;
 	/* kick everything off with a single write */
 	if (send(pipes[1], "e", 1, 0) < 0)
 		perror("send");
 	event_dispatch();
 	evutil_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);
 }

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ipc/chromium/src/third_party/libevent/test/bench_cascade.c@6474c204b198 (annotated)

ipc/chromium/src/third_party/libevent/test/bench_cascade.c