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/* Test program for timedout read/write lock functions.
Copyright (C) 2000-2021 Free Software Foundation, Inc.
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; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <support/check.h>
#include <support/timespec.h>
#include <support/xthread.h>
#define NWRITERS 15
#define WRITETRIES 10
#define NREADERS 15
#define READTRIES 15
static const struct timespec timeout = { 0,1000000 };
static const struct timespec delay = { 0, 1000000 };
#ifndef KIND
# define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
#endif
/* A bogus clock value that tells the tests to use pthread_rwlock_timedrdlock
and pthread_rwlock_timedwrlock rather than pthread_rwlock_clockrdlock and
pthread_rwlock_clockwrlock. */
#define CLOCK_USE_TIMEDLOCK (-1)
static pthread_rwlock_t lock;
struct thread_args
{
int nr;
clockid_t clockid;
const char *fnname;
};
static void *
writer_thread (void *arg)
{
struct thread_args *args = arg;
const int nr = args->nr;
const clockid_t clockid = args->clockid;
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
const char *fnname = args->fnname;
struct timespec ts;
int n;
for (n = 0; n < WRITETRIES; ++n)
{
int e;
do
{
xclock_gettime (clockid_for_get, &ts);
ts = timespec_add (ts, timeout);
ts = timespec_add (ts, timeout);
printf ("writer thread %d tries again\n", nr);
e = (clockid == CLOCK_USE_TIMEDLOCK)
? pthread_rwlock_timedwrlock (&lock, &ts)
: pthread_rwlock_clockwrlock (&lock, clockid, &ts);
if (e != 0 && e != ETIMEDOUT)
FAIL_EXIT1 ("%swrlock failed", fnname);
}
while (e == ETIMEDOUT);
printf ("writer thread %d succeeded\n", nr);
nanosleep (&delay, NULL);
if (pthread_rwlock_unlock (&lock) != 0)
FAIL_EXIT1 ("unlock for writer failed");
printf ("writer thread %d released\n", nr);
}
return NULL;
}
static void *
reader_thread (void *arg)
{
struct thread_args *args = arg;
const int nr = args->nr;
const clockid_t clockid = args->clockid;
const clockid_t clockid_for_get =
(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
const char *fnname = args->fnname;
struct timespec ts;
int n;
for (n = 0; n < READTRIES; ++n)
{
int e;
do
{
xclock_gettime (clockid_for_get, &ts);
ts = timespec_add (ts, timeout);
printf ("reader thread %d tries again\n", nr);
if (clockid == CLOCK_USE_TIMEDLOCK)
e = pthread_rwlock_timedrdlock (&lock, &ts);
else
e = pthread_rwlock_clockrdlock (&lock, clockid, &ts);
if (e != 0 && e != ETIMEDOUT)
FAIL_EXIT1 ("%srdlock failed", fnname);
}
while (e == ETIMEDOUT);
printf ("reader thread %d succeeded\n", nr);
nanosleep (&delay, NULL);
if (pthread_rwlock_unlock (&lock) != 0)
FAIL_EXIT1 ("unlock for reader failed");
printf ("reader thread %d released\n", nr);
}
return NULL;
}
static int
do_test_clock (clockid_t clockid, const char *fnname)
{
pthread_t thwr[NWRITERS];
pthread_t thrd[NREADERS];
int n;
pthread_rwlockattr_t a;
if (pthread_rwlockattr_init (&a) != 0)
FAIL_EXIT1 ("rwlockattr_t failed");
if (pthread_rwlockattr_setkind_np (&a, KIND) != 0)
FAIL_EXIT1 ("rwlockattr_setkind failed");
if (pthread_rwlock_init (&lock, &a) != 0)
FAIL_EXIT1 ("rwlock_init failed");
/* Make standard error the same as standard output. */
dup2 (1, 2);
/* Make sure we see all message, even those on stdout. */
setvbuf (stdout, NULL, _IONBF, 0);
struct thread_args wargs[NWRITERS];
for (n = 0; n < NWRITERS; ++n) {
wargs[n].nr = n;
wargs[n].clockid = clockid;
wargs[n].fnname = fnname;
thwr[n] = xpthread_create (NULL, writer_thread, &wargs[n]);
}
struct thread_args rargs[NREADERS];
for (n = 0; n < NREADERS; ++n) {
rargs[n].nr = n;
rargs[n].clockid = clockid;
rargs[n].fnname = fnname;
thrd[n] = xpthread_create (NULL, reader_thread, &rargs[n]);
}
/* Wait for all the threads. */
for (n = 0; n < NWRITERS; ++n)
xpthread_join (thwr[n]);
for (n = 0; n < NREADERS; ++n)
xpthread_join (thrd[n]);
return 0;
}
static int
do_test (void)
{
do_test_clock (CLOCK_USE_TIMEDLOCK, "timed");
do_test_clock (CLOCK_REALTIME, "clock(realtime)");
do_test_clock (CLOCK_MONOTONIC, "clock(monotonic)");
return 0;
}
#define TIMEOUT 30
#include <support/test-driver.c>
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