nptl/tst-thread-affinity-pthread2.c

   1 /* Separate thread test for pthread_getaffinity_np, pthread_setaffinity_np.
   2    Copyright (C) 2015-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <pthread.h>
  21 #include <stdbool.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 /* Defined for the benefit of tst-skeleton-thread-affinity.c, included
  26    below.  This variant runs the functions on a separate thread.  */
  27
  28 struct affinity_access_task
  29 {
  30   pthread_t thread;
  31   cpu_set_t *set;
  32   size_t size;
  33   bool get;
  34   int result;
  35 };
  36
  37 static void *
  38 affinity_access_thread (void *closure)
  39 {
  40   struct affinity_access_task *task = closure;
  41   if (task->get)
  42     task->result = pthread_getaffinity_np
  43       (task->thread, task->size, task->set);
  44   else
  45     task->result = pthread_setaffinity_np
  46       (task->thread, task->size, task->set);
  47   return NULL;
  48 }
  49
  50 static int
  51 run_affinity_access_thread (cpu_set_t *set, size_t size, bool get)
  52 {
  53   struct affinity_access_task task =
  54     {
  55       .thread = pthread_self (),
  56       .set = set,
  57       .size = size,
  58       .get = get
  59     };
  60   pthread_t thr;
  61   int ret = pthread_create (&thr, NULL, affinity_access_thread, &task);
  62   if (ret != 0)
  63     {
  64       errno = ret;
  65       printf ("error: could not create affinity access thread: %m\n");
  66       abort ();
  67     }
  68   ret = pthread_join (thr, NULL);
  69   if (ret != 0)
  70     {
  71       errno = ret;
  72       printf ("error: could not join affinity access thread: %m\n");
  73       abort ();
  74     }
  75   if (task.result != 0)
  76     {
  77       errno = task.result;
  78       return -1;
  79     }
  80   return 0;
  81 }
  82
  83 static int
  84 setaffinity (size_t size, const cpu_set_t *set)
  85 {
  86   return run_affinity_access_thread ((cpu_set_t *) set, size, false);
  87 }
  88
  89 static int
  90 getaffinity (size_t size, cpu_set_t *set)
  91 {
  92   return run_affinity_access_thread (set, size, true);
  93 }
  94
  95 #include "tst-skeleton-thread-affinity.c"