1 /* $OpenBSD: blocked_close.c,v 1.2 2006/10/06 13:11:58 kurt Exp $ */
3 * Copyright (c) 2006 Kurt Miller <kurt@intricatesoftware.com>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 * Test close() racing with other threads using the same file
20 * descriptor, with some of them blocking on data that will never
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
33 #define ITERATIONS 100
34 #define BUSY_THREADS 5
35 #define WAITING_THREADS 5
38 deadlock_detector(void *arg)
41 PANIC("deadlock detected");
45 waiting_read(void *arg)
48 struct sockaddr remote_addr;
50 int n, remote_addr_len = sizeof(struct sockaddr);
52 n = recvfrom(fd, &readBuf, 1, 0, &remote_addr, &remote_addr_len);
55 return ((caddr_t)NULL + errno);
61 busy_thread(void *arg)
65 /* loop until error */
66 while(fcntl(fd, F_GETFD, NULL) != -1);
68 return ((caddr_t)NULL + errno);
72 main(int argc, char *argv[])
74 pthread_t busy_threads[BUSY_THREADS];
75 pthread_t waiting_threads[WAITING_THREADS];
76 pthread_t deadlock_thread;
77 struct sockaddr_in addr;
83 rqtp.tv_nsec = 1000000;
85 bzero((char *) &addr, sizeof addr);
86 addr.sin_family = AF_INET;
87 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
88 addr.sin_port = htons(0);
90 CHECKr(pthread_create(&deadlock_thread, NULL,
91 deadlock_detector, NULL));
93 for (i = 0; i < ITERATIONS; i++) {
94 CHECKe(fd = socket(AF_INET, SOCK_DGRAM, 0));
95 CHECKr(bind(fd, (struct sockaddr *)&addr, sizeof(addr)));
96 for (j = 0; j < BUSY_THREADS; j++)
97 CHECKr(pthread_create(&busy_threads[j], NULL,
98 busy_thread, (void *)&fd));
99 for (j = 0; j < WAITING_THREADS; j++)
100 CHECKr(pthread_create(&waiting_threads[j], NULL,
101 waiting_read, (void *)&fd));
102 nanosleep(&rqtp, NULL);
104 for (j = 0; j < BUSY_THREADS; j++) {
105 CHECKr(pthread_join(busy_threads[j], &value_ptr));
106 ASSERT(value_ptr == (void *)EBADF);
108 for (j = 0; j < WAITING_THREADS; j++) {
109 CHECKr(pthread_join(waiting_threads[j], &value_ptr));
110 ASSERT(value_ptr == (void *)EBADF);