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/* Copyright (C) 2003-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <support/check.h>
#include <support/timespec.h>
#include <support/xunistd.h>
#include <support/xthread.h>
#ifdef ENABLE_PP
#include "tst-tpp.h"
#endif
/* A bogus clock value that tells run_test to use pthread_mutex_timedlock
rather than pthread_mutex_clocklock. */
#define CLOCK_USE_TIMEDLOCK (-1)
static void
do_test_clock (clockid_t clockid, int tmo_result)
{
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
size_t ps = sysconf (_SC_PAGESIZE);
char tmpfname[] = "/tmp/tst-mutex9.XXXXXX";
char data[ps];
void *mem;
int fd;
pthread_mutex_t *m;
pthread_mutexattr_t a;
pid_t pid;
fd = mkstemp (tmpfname);
if (fd == -1)
FAIL_EXIT1 ("cannot open temporary file: %m\n");
/* Make sure it is always removed. */
unlink (tmpfname);
/* Create one page of data. */
memset (data, '\0', ps);
/* Write the data to the file. */
xwrite (fd, data, ps);
mem = xmmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd);
m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
& ~(__alignof (pthread_mutex_t) - 1));
TEST_COMPARE (pthread_mutexattr_init (&a), 0);
TEST_COMPARE (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED), 0);
TEST_COMPARE (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE), 0);
#if defined ENABLE_PI
TEST_COMPARE (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT), 0);
#elif defined ENABLE_PP
TEST_COMPARE (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_PROTECT), 0);
TEST_COMPARE (pthread_mutexattr_setprioceiling (&a, 6), 0);
#endif
int e;
if ((e = pthread_mutex_init (m, &a)) != 0)
{
#ifdef ENABLE_PI
if (e == ENOTSUP)
FAIL_UNSUPPORTED ("PI mutexes unsupported");
#endif
FAIL_EXIT1 ("mutex_init failed");
}
TEST_COMPARE (pthread_mutex_lock (m), 0);
TEST_COMPARE (pthread_mutexattr_destroy (&a), 0);
puts ("going to fork now");
pid = xfork ();
if (pid == 0)
{
if (pthread_mutex_trylock (m) == 0)
FAIL_EXIT1 ("child: mutex_trylock succeeded");
if (pthread_mutex_unlock (m) == 0)
FAIL_EXIT1 ("child: mutex_unlock succeeded");
const struct timespec ts = timespec_add (xclock_now (clockid_for_get),
make_timespec (0, 500000000));
if (clockid == CLOCK_USE_TIMEDLOCK)
TEST_COMPARE (pthread_mutex_timedlock (m, &ts), tmo_result);
else
TEST_COMPARE (pthread_mutex_clocklock (m, clockid, &ts), tmo_result);
alarm (1);
pthread_mutex_lock (m);
puts ("child: mutex_lock returned");
exit (0);
}
sleep (2);
int status;
if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
FAIL_EXIT1 ("waitpid failed");
if (! WIFSIGNALED (status))
FAIL_EXIT1 ("child not killed by signal");
TEST_COMPARE (WTERMSIG (status), SIGALRM);
}
static int
do_test (void)
{
#ifdef ENABLE_PP
init_tpp_test ();
#endif
int monotonic_result =
#ifdef ENABLE_PI
support_mutex_pi_monotonic () ? ETIMEDOUT : EINVAL;
#else
ETIMEDOUT;
#endif
do_test_clock (CLOCK_USE_TIMEDLOCK, ETIMEDOUT);
do_test_clock (CLOCK_REALTIME, ETIMEDOUT);
do_test_clock (CLOCK_MONOTONIC, monotonic_result);
return 0;
}
#include <support/test-driver.c>
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