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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Joyent, Inc.
*/
/*
* All we're doing is constantly modifying a thread name while DTrace is
* watching us, making sure we don't break.
*/
#include <sys/fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#define NR_THREADS (100)
#define RUNTIME (30) /* seconds */
static void
random_ascii(char *buf, size_t bufsize)
{
char table[] = "abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ,.-#'?!";
size_t len = rand() % bufsize;
bzero(buf, bufsize);
for (size_t i = 0; i < len; i++) {
buf[i] = table[rand() % (sizeof (table) - 1)];
}
}
static void
busy()
{
struct timeval tv1;
struct timeval tv2;
if (gettimeofday(&tv1, NULL) != 0)
abort();
for (;;) {
static volatile int i;
for (i = 0; i < 2000000; i++)
;
if (gettimeofday(&tv2, NULL) != 0)
abort();
/* janky, but we don't care */
if (tv2.tv_sec != tv1.tv_sec)
return;
}
}
static void *
thread(void *arg)
{
char name[PTHREAD_MAX_NAMELEN_NP];
for (size_t i = 0; ; i++) {
random_ascii(name, sizeof (name));
if ((i % 100) == 0) {
if (pthread_setname_np(pthread_self(), NULL) != 0)
abort();
} else {
(void) pthread_setname_np(pthread_self(), name);
}
busy();
}
return (NULL);
}
int
main(int argc, char **argv)
{
pthread_t tids[NR_THREADS];
for (size_t i = 0; i < NR_THREADS; i++) {
if (pthread_create(&tids[i], NULL, thread, NULL) != 0)
exit(EXIT_FAILURE);
}
sleep(RUNTIME);
exit(EXIT_SUCCESS);
}
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