118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/* $NetBSD: t_scan.c,v 1.2 2021/10/10 19:17:31 wiz Exp $ */
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/*-
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* Copyright (c) 2021 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: t_scan.c,v 1.2 2021/10/10 19:17:31 wiz Exp $");
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#include <sys/event.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <err.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <atf-c.h>
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/*
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* Each kevent thread will make this many kevent() calls, and if it
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* achieves this mark, we assume the race condition has not occurred
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* the declare the test passes.
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*/
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#define NKEVENT_CALLS 10000
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static int kq;
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static void *
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kevent_thread(void *arg)
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{
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struct timespec ts = { 0, 0 };
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struct kevent event;
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int rv, i;
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for (i = 0; i < NKEVENT_CALLS; i++) {
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rv = kevent(kq, NULL, 0, &event, 1, &ts);
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if (rv < 0) {
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i = rv;
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break;
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}
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if (rv != 1) {
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break;
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}
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}
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return (void *)(intptr_t)i;
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}
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ATF_TC(scan1);
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ATF_TC_HEAD(scan1, tc)
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{
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atf_tc_set_md_var(tc, "descr",
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"Exercises multi-threaded kevent() calls (PR kern/50094)");
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}
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ATF_TC_BODY(scan1, tc)
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{
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pthread_t t1, t2;
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void *v1, *v2;
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intptr_t r1, r2;
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struct kevent event;
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int p[2];
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ATF_REQUIRE(pipe(p) == 0);
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ATF_REQUIRE((kq = kqueue()) >= 0);
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EV_SET(&event, p[0], EVFILT_READ, EV_ADD, 0, 0, 0);
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ATF_REQUIRE(kevent(kq, &event, 1, NULL, 0, NULL) == 0);
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ATF_REQUIRE(write(p[1], p, 1) == 1);
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ATF_REQUIRE(pthread_create(&t1, NULL, kevent_thread, NULL) == 0);
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ATF_REQUIRE(pthread_create(&t2, NULL, kevent_thread, NULL) == 0);
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ATF_REQUIRE(pthread_join(t1, &v1) == 0);
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r1 = (intptr_t)v1;
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ATF_REQUIRE(pthread_join(t2, &v2) == 0);
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r2 = (intptr_t)v2;
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ATF_REQUIRE(r1 >= 0);
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ATF_REQUIRE(r2 >= 0);
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ATF_REQUIRE(r1 == NKEVENT_CALLS);
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ATF_REQUIRE(r2 == NKEVENT_CALLS);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, scan1);
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return atf_no_error();
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}
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