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glibc/sysdeps/unix/sysv/linux/tst-skeleton-thread-affinity.c
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/* Generic test for CPU affinity functions, multi-threaded variant. | |
Copyright (C) 2015-2016 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 | |
<http://www.gnu.org/licenses/>. */ | |
/* Before including this file, a test has to declare the helper | |
getaffinity and setaffinity functions described in | |
tst-skeleton-affinity.c, which is included below. */ | |
#include <errno.h> | |
#include <pthread.h> | |
#include <stdbool.h> | |
#include <stdlib.h> | |
#include <sys/time.h> | |
struct conf; | |
static bool early_test (struct conf *); | |
/* Arbitrary run time for each pass. */ | |
#define PASS_TIMEOUT 2 | |
/* There are two passes (one with sched_yield, one without), and we | |
double the timeout to be on the safe side. */ | |
#define TIMEOUT (2 * PASS_TIMEOUT * 2) | |
#include "tst-skeleton-affinity.c" | |
/* 0 if still running, 1 of stopping requested. */ | |
static int still_running; | |
/* 0 if no scheduling failures, 1 if failures are encountered. */ | |
static int failed; | |
static void * | |
thread_burn_one_cpu (void *closure) | |
{ | |
int cpu = (uintptr_t) closure; | |
while (__atomic_load_n (&still_running, __ATOMIC_RELAXED) == 0) | |
{ | |
int current = sched_getcpu (); | |
if (sched_getcpu () != cpu) | |
{ | |
printf ("error: Pinned thread %d ran on impossible cpu %d\n", | |
cpu, current); | |
__atomic_store_n (&failed, 1, __ATOMIC_RELAXED); | |
/* Terminate early. */ | |
__atomic_store_n (&still_running, 1, __ATOMIC_RELAXED); | |
} | |
} | |
return NULL; | |
} | |
struct burn_thread | |
{ | |
pthread_t self; | |
struct conf *conf; | |
cpu_set_t *initial_set; | |
cpu_set_t *seen_set; | |
int thread; | |
}; | |
static void * | |
thread_burn_any_cpu (void *closure) | |
{ | |
struct burn_thread *param = closure; | |
/* Schedule this thread around a bit to see if it lands on another | |
CPU. Run this for 2 seconds, once with sched_yield, once | |
without. */ | |
for (int pass = 1; pass <= 2; ++pass) | |
{ | |
time_t start = time (NULL); | |
while (time (NULL) - start <= PASS_TIMEOUT) | |
{ | |
int cpu = sched_getcpu (); | |
if (cpu > param->conf->last_cpu | |
|| !CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (param->conf->set_size), | |
param->initial_set)) | |
{ | |
printf ("error: Unpinned thread %d ran on impossible CPU %d\n", | |
param->thread, cpu); | |
__atomic_store_n (&failed, 1, __ATOMIC_RELAXED); | |
return NULL; | |
} | |
CPU_SET_S (cpu, CPU_ALLOC_SIZE (param->conf->set_size), | |
param->seen_set); | |
if (pass == 1) | |
sched_yield (); | |
} | |
} | |
return NULL; | |
} | |
static void | |
stop_and_join_threads (struct conf *conf, cpu_set_t *set, | |
pthread_t *pinned_first, pthread_t *pinned_last, | |
struct burn_thread *other_first, | |
struct burn_thread *other_last) | |
{ | |
__atomic_store_n (&still_running, 1, __ATOMIC_RELAXED); | |
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; | |
int ret = pthread_join (*p, NULL); | |
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 (); | |
} | |
} | |
for (struct burn_thread *p = other_first; p < other_last; ++p) | |
{ | |
int cpu = p - other_first; | |
if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), set)) | |
continue; | |
int ret = pthread_join (p->self, NULL); | |
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 (); | |
} | |
} | |
} | |
/* Tries to check that the initial set of CPUs is complete and that | |
the main thread will not run on any other threads. */ | |
static bool | |
early_test (struct conf *conf) | |
{ | |
pthread_t *pinned_threads | |
= calloc (conf->last_cpu + 1, sizeof (*pinned_threads)); | |
struct burn_thread *other_threads | |
= calloc (conf->last_cpu + 1, sizeof (*other_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 || other_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; | |
} | |
for (int cpu = 0; cpu <= conf->last_cpu; ++cpu) | |
{ | |
if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set)) | |
continue; | |
other_threads[cpu].conf = conf; | |
other_threads[cpu].initial_set = initial_set; | |
other_threads[cpu].thread = cpu; | |
other_threads[cpu].seen_set = CPU_ALLOC (conf->set_size); | |
if (other_threads[cpu].seen_set == NULL) | |
{ | |
puts ("error: Memory allocation failure"); | |
return false; | |
} | |
CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), | |
other_threads[cpu].seen_set); | |
} | |
pthread_attr_t attr; | |
int ret = pthread_attr_init (&attr); | |
if (ret != 0) | |
{ | |
printf ("error: pthread_attr_init failed: %s\n", strerror (ret)); | |
return false; | |
} | |
/* 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, | |
NULL, NULL); | |
return false; | |
} | |
ret = pthread_create (pinned_threads + cpu, &attr, | |
thread_burn_one_cpu, (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, | |
NULL, NULL); | |
return false; | |
} | |
} | |
/* Spawn another set of threads running on all CPUs. */ | |
for (int cpu = 0; cpu <= conf->last_cpu; ++cpu) | |
{ | |
if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set)) | |
continue; | |
ret = pthread_create (&other_threads[cpu].self, NULL, | |
thread_burn_any_cpu, other_threads + cpu); | |
if (ret != 0) | |
{ | |
printf ("error: pthread_create for thread %d failed: %s\n", | |
cpu, strerror (ret)); | |
stop_and_join_threads (conf, initial_set, | |
pinned_threads, | |
pinned_threads + conf->last_cpu + 1, | |
other_threads, other_threads + cpu); | |
return false; | |
} | |
} | |
/* Main thread. */ | |
struct burn_thread main_thread; | |
main_thread.conf = conf; | |
main_thread.initial_set = initial_set; | |
main_thread.seen_set = scratch_set; | |
main_thread.thread = -1; | |
CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), main_thread.seen_set); | |
thread_burn_any_cpu (&main_thread); | |
stop_and_join_threads (conf, initial_set, | |
pinned_threads, | |
pinned_threads + conf->last_cpu + 1, | |
other_threads, other_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)); | |
CPU_ZERO_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set); | |
for (int cpu = 0; cpu <= conf->last_cpu; ++cpu) | |
{ | |
if (!CPU_ISSET_S (cpu, CPU_ALLOC_SIZE (conf->set_size), initial_set)) | |
continue; | |
CPU_OR_S (CPU_ALLOC_SIZE (conf->set_size), | |
scratch_set, scratch_set, other_threads[cpu].seen_set); | |
CPU_FREE (other_threads[cpu].seen_set); | |
} | |
printf ("info: Other threads ran on %d CPU(s)\n", | |
CPU_COUNT_S (CPU_ALLOC_SIZE (conf->set_size), scratch_set));; | |
pthread_attr_destroy (&attr); | |
CPU_FREE (scratch_set); | |
CPU_FREE (initial_set); | |
free (pinned_threads); | |
free (other_threads); | |
return failed == 0; | |
} |