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/* Test sem_getvalue across CPUs. Based on tst-skeleton-thread-affinity.c.
Copyright (C) 2015-2025 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 <semaphore.h>
#include <stdbool.h>
#include <stdlib.h>
#include <support/xthread.h>
#include <sys/time.h>
struct conf;
static bool early_test (struct conf *);
static int
setaffinity (size_t size, const cpu_set_t *set)
{
int ret = pthread_setaffinity_np (pthread_self (), size, set);
if (ret != 0)
{
errno = ret;
return -1;
}
return 0;
}
static int
getaffinity (size_t size, cpu_set_t *set)
{
int ret = pthread_getaffinity_np (pthread_self (), size, set);
if (ret != 0)
{
errno = ret;
return -1;
}
return 0;
}
#include "tst-skeleton-affinity.c"
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static sem_t sem;
static void *
tf (void *arg)
{
void *ret = NULL;
xpthread_mutex_lock (&lock);
int semval;
if (sem_getvalue (&sem, &semval) != 0)
{
printf ("sem_getvalue failed: %m\n");
ret = (void *) 1;
}
else if (semval != 12345)
{
printf ("sem_getvalue returned %d not 12345\n", semval);
ret = (void *) 1;
}
xpthread_mutex_unlock (&lock);
return ret;
}
static int
stop_and_join_threads (struct conf *conf, cpu_set_t *set,
pthread_t *pinned_first, pthread_t *pinned_last)
{
int failed = 0;
for (pthread_t *p = pinned_first; p < pinned_last; ++p)
{
int cpu = p - pinned_first;
if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), set))
continue;
void *retval = (void *) 1;
int ret = pthread_join (*p, &retval);
if (ret != 0)
{
printf ("error: Failed to join thread %d: %s\n", cpu, strerror (ret));
fflush (stdout);
/* Cannot shut down cleanly with threads still running. */
abort ();
}
if (retval != NULL)
failed = 1;
}
return failed;
}
static bool
early_test (struct conf *conf)
{
int ret;
ret = sem_init (&sem, 0, 12345);
if (ret != 0)
{
printf ("error: sem_init failed: %m\n");
return false;
}
xpthread_mutex_lock (&lock);
pthread_t *pinned_threads
= calloc (conf->last_cpu + 1, sizeof (*pinned_threads));
cpu_set_t *initial_set = CPU_ALLOC (conf->set_size);
cpu_set_t *scratch_set = CPU_ALLOC (conf->set_size);
if (pinned_threads == NULL || initial_set == NULL || scratch_set == NULL)
{
puts ("error: Memory allocation failure");
return false;
}
if (getaffinity (CPU_ALLOC_SIZE (conf->set_size), initial_set) < 0)
{
printf ("error: pthread_getaffinity_np failed: %m\n");
return false;
}
pthread_attr_t attr;
ret = pthread_attr_init (&attr);
if (ret != 0)
{
printf ("error: pthread_attr_init failed: %s\n", strerror (ret));
return false;
}
support_set_small_thread_stack_size (&attr);
/* Spawn a thread pinned to each available CPU. */
for (int cpu = 0; cpu <= conf->last_cpu; ++cpu)
{
if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set))
continue;
CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set);
CPU_SET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), scratch_set);
ret = pthread_attr_setaffinity_np
(&attr, CPU_ALLOC_SIZE (conf->set_size), scratch_set);
if (ret != 0)
{
printf ("error: pthread_attr_setaffinity_np for CPU %d failed: %s\n",
cpu, strerror (ret));
stop_and_join_threads (conf, initial_set,
pinned_threads, pinned_threads + cpu);
return false;
}
ret = pthread_create (pinned_threads + cpu, &attr,
tf, (void *) (uintptr_t) cpu);
if (ret != 0)
{
printf ("error: pthread_create for CPU %d failed: %s\n",
cpu, strerror (ret));
stop_and_join_threads (conf, initial_set,
pinned_threads, pinned_threads + cpu);
return false;
}
}
/* Main thread. */
xpthread_mutex_unlock (&lock);
int failed = stop_and_join_threads (conf, initial_set,
pinned_threads,
pinned_threads + conf->last_cpu + 1);
printf ("info: Main thread ran on %d CPU(s) of %d available CPU(s)\n",
CPU_COUNT_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set),
CPU_COUNT_S (CPU_ALLOC_SIZE (conf->set_size), initial_set));
pthread_attr_destroy (&attr);
CPU_FREE (scratch_set);
CPU_FREE (initial_set);
free (pinned_threads);
return failed == 0;
}
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