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/* $OpenBSD: blocked_close.c,v 1.1 2006/09/22 18:29:47 kurt Exp $ */
/*
* Copyright (c) 2006 Kurt Miller <kurt@intricatesoftware.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Test close() racing with other threads using the same file
* descriptor, with some of them blocking on data that will never
* arrive.
*/
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "test.h"
#define ITERATIONS 100
#define BUSY_THREADS 5
#define WAITING_THREADS 5
static void *
deadlock_detector(void *arg)
{
sleep(60);
PANIC("deadlock detected");
}
static void *
waiting_read(void *arg)
{
int fd = (int)arg;
struct sockaddr remote_addr;
char readBuf;
int n, remote_addr_len = sizeof(struct sockaddr);
n = recvfrom(fd, &readBuf, 1, 0, &remote_addr, &remote_addr_len);
if (n == -1)
return ((void *)errno);
else
return (0);
}
static void *
busy_thread(void *arg)
{
int fd = (int)arg;
/* loop until error */
while(fcntl(fd, F_GETFD, NULL) != -1);
return ((void *)errno);
}
int
main(int argc, char *argv[])
{
pthread_t busy_threads[BUSY_THREADS];
pthread_t waiting_threads[WAITING_THREADS];
pthread_t deadlock_thread;
struct sockaddr_in addr;
int fd, i, j;
void *value_ptr;
struct timespec rqtp;
rqtp.tv_sec = 0;
rqtp.tv_nsec = 1000000;
bzero((char *) &addr, sizeof addr);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(0);
CHECKr(pthread_create(&deadlock_thread, NULL,
deadlock_detector, NULL));
for (i = 0; i < ITERATIONS; i++) {
CHECKe(fd = socket(AF_INET, SOCK_DGRAM, 0));
CHECKr(bind(fd, (struct sockaddr *)&addr, sizeof(addr)));
for (j = 0; j < BUSY_THREADS; j++)
CHECKr(pthread_create(&busy_threads[j], NULL,
busy_thread, (void *)fd));
for (j = 0; j < WAITING_THREADS; j++)
CHECKr(pthread_create(&waiting_threads[j], NULL,
waiting_read, (void *)fd));
nanosleep(&rqtp, NULL);
CHECKr(close(fd));
for (j = 0; j < BUSY_THREADS; j++) {
CHECKr(pthread_join(busy_threads[j], &value_ptr));
ASSERT(value_ptr == (void *)EBADF);
}
for (j = 0; j < WAITING_THREADS; j++) {
CHECKr(pthread_join(waiting_threads[j], &value_ptr));
ASSERT(value_ptr == (void *)EBADF);
}
}
SUCCEED;
}
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