minix/tests/lib/librt/t_sem.c

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/* $NetBSD: t_sem.c,v 1.2 2010/11/08 13:05:49 njoly Exp $ */
/*
* Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2008, 2010\
The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_sem.c,v 1.2 2010/11/08 13:05:49 njoly Exp $");
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <semaphore.h>
#include <stdio.h>
#include <unistd.h>
#include <atf-c.h>
#define NCHILDREN 10
ATF_TC(basic);
ATF_TC_HEAD(basic, tc)
{
atf_tc_set_md_var(tc, "descr", "Checks basic functionality of POSIX "
"semaphores");
}
ATF_TC_BODY(basic, tc)
{
int val;
sem_t *sem_b;
if (sysconf(_SC_SEMAPHORES) == -1)
atf_tc_skip("POSIX semaphores not supported");
sem_b = sem_open("/sem_b", O_CREAT | O_EXCL, 0644, 0);
ATF_REQUIRE(sem_b != SEM_FAILED);
ATF_REQUIRE_EQ(sem_getvalue(sem_b, &val), 0);
ATF_REQUIRE_EQ(val, 0);
ATF_REQUIRE_EQ(sem_post(sem_b), 0);
ATF_REQUIRE_EQ(sem_getvalue(sem_b, &val), 0);
ATF_REQUIRE_EQ(val, 1);
ATF_REQUIRE_EQ(sem_wait(sem_b), 0);
ATF_REQUIRE_EQ(sem_trywait(sem_b), -1);
ATF_REQUIRE_EQ(errno, EAGAIN);
ATF_REQUIRE_EQ(sem_post(sem_b), 0);
ATF_REQUIRE_EQ(sem_trywait(sem_b), 0);
ATF_REQUIRE_EQ(sem_post(sem_b), 0);
ATF_REQUIRE_EQ(sem_wait(sem_b), 0);
ATF_REQUIRE_EQ(sem_post(sem_b), 0);
ATF_REQUIRE_EQ(sem_close(sem_b), 0);
ATF_REQUIRE_EQ(sem_unlink("/sem_b"), 0);
}
ATF_TC(child);
ATF_TC_HEAD(child, tc)
{
atf_tc_set_md_var(tc, "descr", "Checks using semaphores to synchronize "
"parent with multiple child processes");
}
ATF_TC_BODY(child, tc)
{
pid_t children[NCHILDREN];
unsigned i, j;
sem_t *sem_a;
int status;
pid_t pid;
if (sysconf(_SC_SEMAPHORES) == -1)
atf_tc_skip("POSIX semaphores not supported");
sem_a = sem_open("/sem_a", O_CREAT | O_EXCL, 0644, 0);
ATF_REQUIRE(sem_a != SEM_FAILED);
for (j = 1; j <= 2; j++) {
for (i = 0; i < NCHILDREN; i++) {
switch ((pid = fork())) {
case -1:
atf_tc_fail("fork() returned -1");
case 0:
printf("PID %d waiting for semaphore...\n",
getpid());
ATF_REQUIRE_MSG(sem_wait(sem_a) == 0,
"sem_wait failed; iteration %d", j);
printf("PID %d got semaphore\n", getpid());
_exit(0);
default:
children[i] = pid;
break;
}
}
for (i = 0; i < NCHILDREN; i++) {
sleep(1);
printf("main loop %d: posting...\n", j);
ATF_REQUIRE_EQ(sem_post(sem_a), 0);
}
for (i = 0; i < NCHILDREN; i++) {
ATF_REQUIRE_EQ(waitpid(children[i], &status, 0), children[i]);
ATF_REQUIRE(WIFEXITED(status));
ATF_REQUIRE_EQ(WEXITSTATUS(status), 0);
}
}
ATF_REQUIRE_EQ(sem_close(sem_a), 0);
ATF_REQUIRE_EQ(sem_unlink("/sem_a"), 0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, basic);
ATF_TP_ADD_TC(tp, child);
return atf_no_error();
}