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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 <stdio.h>
#include <stdlib.h>
#include <time.h>
/* This test is a template for other tests to use. Other tests define
the following macros to change the behaviour of the template test.
The test is very simple, it configures N threads given the parameters
below and then proceeds to go through mutex lock and unlock
operations in each thread as described before for the thread
function. */
#ifndef TYPE
# define TYPE PTHREAD_MUTEX_DEFAULT
#endif
#ifndef ROBUST
# define ROBUST PTHREAD_MUTEX_STALLED
#endif
#ifndef DELAY_NSEC
# define DELAY_NSEC 11000
#endif
#ifndef ROUNDS
# define ROUNDS 1000
#endif
#ifndef N
# define N 100
#endif
static pthread_mutex_t lock;
/* Each thread locks and the subsequently unlocks the lock, yielding
the smallest critical section possible. After the unlock the thread
waits DELAY_NSEC nanoseconds before doing the lock and unlock again.
Every thread does this ROUNDS times. The lock and unlock are
checked for errors. */
static void *
tf (void *arg)
{
int nr = (long int) arg;
int cnt;
struct timespec ts = { .tv_sec = 0, .tv_nsec = DELAY_NSEC };
for (cnt = 0; cnt < ROUNDS; ++cnt)
{
if (pthread_mutex_lock (&lock) != 0)
{
printf ("thread %d: failed to get the lock\n", nr);
return (void *) 1l;
}
if (pthread_mutex_unlock (&lock) != 0)
{
printf ("thread %d: failed to release the lock\n", nr);
return (void *) 1l;
}
if ((ts.tv_sec > 0) || (ts.tv_nsec > 0))
nanosleep (&ts, NULL);
}
return NULL;
}
/* Setup and run N threads, where each thread does as described
in the above thread function. The threads are given a minimal 1MiB
stack since they don't do anything between the lock and unlock. */
static int
do_test (void)
{
pthread_mutexattr_t a;
if (pthread_mutexattr_init (&a) != 0)
{
puts ("mutexattr_init failed");
exit (1);
}
if (pthread_mutexattr_settype (&a, TYPE) != 0)
{
puts ("mutexattr_settype failed");
exit (1);
}
if (pthread_mutexattr_setrobust (&a, ROBUST) != 0)
{
puts ("mutexattr_setrobust failed");
exit (1);
}
#ifdef ENABLE_PI
if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
{
puts ("pthread_mutexattr_setprotocol failed");
return 1;
}
#endif
int e = pthread_mutex_init (&lock, &a);
if (e != 0)
{
#ifdef ENABLE_PI
if (e == ENOTSUP)
{
puts ("PI mutexes unsupported");
return 0;
}
#endif
puts ("mutex_init failed");
return 1;
}
if (pthread_mutexattr_destroy (&a) != 0)
{
puts ("mutexattr_destroy failed");
return 1;
}
pthread_attr_t at;
pthread_t th[N];
int cnt;
if (pthread_attr_init (&at) != 0)
{
puts ("attr_init failed");
return 1;
}
if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
{
puts ("attr_setstacksize failed");
return 1;
}
if (pthread_mutex_lock (&lock) != 0)
{
puts ("locking in parent failed");
return 1;
}
for (cnt = 0; cnt < N; ++cnt)
if (pthread_create (&th[cnt], &at, tf, (void *) (long int) cnt) != 0)
{
printf ("creating thread %d failed\n", cnt);
return 1;
}
if (pthread_attr_destroy (&at) != 0)
{
puts ("attr_destroy failed");
return 1;
}
if (pthread_mutex_unlock (&lock) != 0)
{
puts ("unlocking in parent failed");
return 1;
}
for (cnt = 0; cnt < N; ++cnt)
if (pthread_join (th[cnt], NULL) != 0)
{
printf ("joining thread %d failed\n", cnt);
return 1;
}
return 0;
}
#define TIMEOUT 60
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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