136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2013 by Delphix. All rights reserved.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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/*
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* The size of the output file, "go.out", should be 80*8192*2 = 1310720
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*
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* $ cd /tmp; go; ls -l go.out
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* done.
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* -rwxr-xr-x 1 jdm staff 1310720 Apr 13 19:45 go.out
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* $ cd /zfs; go; ls -l go.out
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* done.
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* -rwxr-xr-x 1 jdm staff 663552 Apr 13 19:45 go.out
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*
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* The file on zfs is short as it does not appear that zfs is making the
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* implicit seek to EOF and the actual write atomic. From the SUSv3
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* interface spec, behavior is undefined if concurrent writes are performed
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* from multi-processes to a single file. So I don't know if this is a
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* standards violation, but I cannot find any such disclaimers in our
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* man pages. This issue came up at a customer site in another context, and
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* the suggestion was to open the file with O_APPEND, but that wouldn't
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* help with zfs(see 4977529). Also see bug# 5031301.
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*/
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static int outfd = 0;
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static void *
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go(void *data)
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{
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int ret, i = 0, n = *(int *)data;
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char buf[8192] = {0};
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(void) memset(buf, n, sizeof (buf));
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for (i = 0; i < 80; i++) {
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ret = write(outfd, buf, sizeof (buf));
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if (ret != sizeof (buf))
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perror("write");
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}
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return (NULL);
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}
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static void
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usage(void)
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{
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(void) fprintf(stderr,
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"usage: zfs_threadsappend <file name>\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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pthread_t tid;
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int ret = 0;
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long ncpus = 0;
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int i;
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if (argc != 2) {
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usage();
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}
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ncpus = sysconf(_SC_NPROCESSORS_ONLN);
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if (ncpus < 0) {
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(void) fprintf(stderr,
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"Invalid return from sysconf(_SC_NPROCESSORS_ONLN)"
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" : errno (decimal)=%d\n", errno);
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exit(1);
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}
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if (ncpus < 2) {
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(void) fprintf(stderr,
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"Must execute this binary on a multi-processor system\n");
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exit(1);
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}
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outfd = open(argv[optind++], O_RDWR|O_CREAT|O_APPEND|O_TRUNC, 0777);
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if (outfd == -1) {
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(void) fprintf(stderr,
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"zfs_threadsappend: "
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"open(%s, O_RDWR|O_CREAT|O_APPEND|O_TRUNC, 0777)"
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" failed\n", argv[optind]);
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perror("open");
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exit(1);
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}
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for (i = 0; i < 2; i++) {
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ret = pthread_create(&tid, NULL, go, (void *)&i);
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if (ret != 0) {
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(void) fprintf(stderr,
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"zfs_threadsappend: thr_create(#%d) "
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"failed error=%d\n", i+1, ret);
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exit(1);
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}
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}
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while (pthread_join(tid, NULL) == 0)
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continue;
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return (0);
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}
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