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/* Copyright (C) 2002-2025 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <support/check.h>
#include <support/timespec.h>
#include <support/xthread.h>
#include <support/xtime.h>
/* A bogus clock value that tells run_test to use pthread_rwlock_timedrdlock
and pthread_rwlock_timedwrlock rather than pthread_rwlock_clockrdlock and
pthread_rwlock_clockwrlock. */
#define CLOCK_USE_TIMEDLOCK (-1)
static int kind[] =
{
PTHREAD_RWLOCK_PREFER_READER_NP,
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP,
PTHREAD_RWLOCK_PREFER_WRITER_NP,
};
struct thread_args
{
pthread_rwlock_t *rwlock;
clockid_t clockid;
const char *fnname;
};
static void *
tf (void *arg)
{
struct thread_args *args = arg;
pthread_rwlock_t *r = args->rwlock;
const clockid_t clockid = args->clockid;
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
const char *fnname = args->fnname;
/* Timeout: 0.3 secs. */
struct timespec ts_start;
xclock_gettime (clockid_for_get, &ts_start);
const struct timespec ts_timeout = timespec_add (ts_start,
make_timespec (0, 300000000));
if (clockid == CLOCK_USE_TIMEDLOCK)
TEST_COMPARE (pthread_rwlock_timedwrlock (r, &ts_timeout), ETIMEDOUT);
else
TEST_COMPARE (pthread_rwlock_clockwrlock (r, clockid, &ts_timeout),
ETIMEDOUT);
printf ("child: %swrlock failed with ETIMEDOUT", fnname);
TEST_TIMESPEC_NOW_OR_AFTER (clockid_for_get, ts_timeout);
struct timespec ts_invalid;
xclock_gettime (clockid_for_get, &ts_invalid);
ts_invalid.tv_sec += 10;
/* Note that the following operation makes ts invalid. */
ts_invalid.tv_nsec += 1000000000;
if (clockid == CLOCK_USE_TIMEDLOCK)
TEST_COMPARE (pthread_rwlock_timedwrlock (r, &ts_invalid), EINVAL);
else
TEST_COMPARE (pthread_rwlock_clockwrlock (r, clockid, &ts_invalid), EINVAL);
printf ("child: %swrlock failed with EINVAL", fnname);
return NULL;
}
static int
do_test_clock (clockid_t clockid, const char *fnname)
{
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
size_t cnt;
for (cnt = 0; cnt < sizeof (kind) / sizeof (kind[0]); ++cnt)
{
pthread_rwlock_t r;
pthread_rwlockattr_t a;
if (pthread_rwlockattr_init (&a) != 0)
FAIL_EXIT1 ("round %zu: rwlockattr_t failed\n", cnt);
if (pthread_rwlockattr_setkind_np (&a, kind[cnt]) != 0)
FAIL_EXIT1 ("round %zu: rwlockattr_setkind failed\n", cnt);
if (pthread_rwlock_init (&r, &a) != 0)
FAIL_EXIT1 ("round %zu: rwlock_init failed\n", cnt);
if (pthread_rwlockattr_destroy (&a) != 0)
FAIL_EXIT1 ("round %zu: rwlockattr_destroy failed\n", cnt);
struct timespec ts;
xclock_gettime (clockid_for_get, &ts);
++ts.tv_sec;
/* Get a read lock. */
if (clockid == CLOCK_USE_TIMEDLOCK) {
if (pthread_rwlock_timedrdlock (&r, &ts) != 0)
FAIL_EXIT1 ("round %zu: rwlock_timedrdlock failed\n", cnt);
} else {
if (pthread_rwlock_clockrdlock (&r, clockid, &ts) != 0)
FAIL_EXIT1 ("round %zu: rwlock_%srdlock failed\n", cnt, fnname);
}
printf ("%zu: got %srdlock\n", cnt, fnname);
struct thread_args args;
args.rwlock = &r;
args.clockid = clockid;
args.fnname = fnname;
pthread_t th = xpthread_create (NULL, tf, &args);
void *status = xpthread_join (th);
if (status != NULL)
FAIL_EXIT1 ("failure in round %zu\n", cnt);
if (pthread_rwlock_destroy (&r) != 0)
FAIL_EXIT1 ("round %zu: rwlock_destroy failed\n", cnt);
}
return 0;
}
static int
do_test (void)
{
do_test_clock (CLOCK_USE_TIMEDLOCK, "timed");
do_test_clock (CLOCK_MONOTONIC, "clock(monotonic)");
do_test_clock (CLOCK_REALTIME, "clock(realtime)");
return 0;
}
#include <support/test-driver.c>
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