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/* Test for sched_setattr, sched_getattr involving multiple threads.
Copyright (C) 2024-2025 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 <sched.h>
#include <stddef.h>
#include <stdio.h>
#include <support/check.h>
#include <support/xthread.h>
#include <unistd.h>
enum { initial_nice_value = 15 };
/* Check that thread TID has nice value EXPECTED. */
static void
check_nice_value (int tid, int expected)
{
struct sched_attr attr;
if (sched_getattr (tid, &attr, sizeof (attr), 0) != 0)
FAIL_EXIT1 ("sched_getattr (%d) failed: %m", tid);
TEST_COMPARE (attr.sched_policy, SCHED_OTHER);
int nice_value = attr.sched_nice;
if (attr.sched_nice != expected)
FAIL_EXIT1 ("thread %d: expected nice value %d, got %d"
" (called from thread %d)",
tid, expected, nice_value, (int) gettid ());
printf ("info: thread %d: nice value %d (called from thread %d)\n",
tid, nice_value, (int) gettid ());
}
/* Set the nice value for TID to VALUE. */
static void
set_nice_value (int tid, int value)
{
struct sched_attr attr =
{
.size = sizeof (attr),
.sched_policy = SCHED_OTHER,
.sched_nice = value,
};
if (sched_setattr (tid, &attr, 0) != 0)
FAIL_EXIT1 ("sched_setattr (%d) failed: %m", tid);
}
static pthread_barrier_t barrier;
static void *
thread_routine (void *nice_value_ptr)
{
int nice_value = *(int *) nice_value_ptr;
/* Check that the nice value was inherited. */
check_nice_value (gettid (), initial_nice_value);
xpthread_barrier_wait (&barrier);
/* Main thread sets nice value. */
xpthread_barrier_wait (&barrier);
check_nice_value (gettid (), nice_value);
set_nice_value (gettid (), nice_value + 2);
xpthread_barrier_wait (&barrier);
/* Main thread sets checks value. */
xpthread_barrier_wait (&barrier);
return NULL;
}
static int
do_test (void)
{
if (nice (initial_nice_value) != initial_nice_value)
FAIL_UNSUPPORTED ("cannot set nice value to initial_nice_value: %m");
xpthread_barrier_init (&barrier, NULL, 3);
check_nice_value (0, initial_nice_value);
check_nice_value (gettid (), initial_nice_value);
int nice0 = initial_nice_value + 1;
pthread_t thr0 = xpthread_create (NULL, thread_routine, &nice0);
int nice1 = initial_nice_value + 2;
pthread_t thr1 = xpthread_create (NULL, thread_routine, &nice1);
check_nice_value (pthread_gettid_np (thr0), initial_nice_value);
check_nice_value (pthread_gettid_np (thr1), initial_nice_value);
xpthread_barrier_wait (&barrier);
set_nice_value (pthread_gettid_np (thr0), nice0);
check_nice_value (pthread_gettid_np (thr0), nice0);
check_nice_value (pthread_gettid_np (thr1), initial_nice_value);
set_nice_value (pthread_gettid_np (thr1), nice1);
check_nice_value (pthread_gettid_np (thr0), nice0);
check_nice_value (pthread_gettid_np (thr1), nice1);
xpthread_barrier_wait (&barrier);
/* Threads set nice value. */
xpthread_barrier_wait (&barrier);
check_nice_value (pthread_gettid_np (thr0), nice0 + 2);
check_nice_value (pthread_gettid_np (thr1), nice1 + 2);
xpthread_barrier_wait (&barrier);
TEST_VERIFY (xpthread_join (thr1) == NULL);
TEST_VERIFY (xpthread_join (thr0) == NULL);
return 0;
}
#include <support/test-driver.c>
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