nptl/tst-tpp.h

   1 /* Copyright (C) 2006-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
   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 <sched.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/syscall.h>
  27
  28 /* This test is Linux specific.  */
  29 #define CHECK_TPP_PRIORITY(normal, boosted) \
  30   do                                                            \
  31     {                                                           \
  32       pid_t tid = syscall (__NR_gettid);                        \
  33                                                                 \
  34       struct sched_param cep_sp;                                \
  35       int cep_policy;                                           \
  36       if (pthread_getschedparam (pthread_self (), &cep_policy,  \
  37                                  &cep_sp) != 0)                 \
  38         {                                                       \
  39           puts ("getschedparam failed");                        \
  40           ret = 1;                                              \
  41         }                                                       \
  42       else if (cep_sp.sched_priority != (normal))               \
  43         {                                                       \
  44           printf ("unexpected priority %d != %d\n",             \
  45                   cep_sp.sched_priority, (normal));             \
  46         }                                                       \
  47       if (syscall (__NR_sched_getparam, tid, &cep_sp) == 0      \
  48           && cep_sp.sched_priority != (boosted))                \
  49         {                                                       \
  50           printf ("unexpected boosted priority %d != %d\n",     \
  51                   cep_sp.sched_priority, (boosted));            \
  52           ret = 1;                                              \
  53         }                                                       \
  54     }                                                           \
  55   while (0)
  56
  57 int fifo_min, fifo_max;
  58
  59 void
  60 init_tpp_test (void)
  61 {
  62   fifo_min = sched_get_priority_min (SCHED_FIFO);
  63   if (fifo_min < 0)
  64     {
  65       printf ("couldn't get min priority for SCHED_FIFO: %m\n");
  66       exit (1);
  67     }
  68
  69   fifo_max = sched_get_priority_max (SCHED_FIFO);
  70   if (fifo_max < 0)
  71     {
  72       printf ("couldn't get max priority for SCHED_FIFO: %m\n");
  73       exit (1);
  74     }
  75
  76   if (fifo_min > 4 || fifo_max < 10)
  77     {
  78       printf ("%d..%d SCHED_FIFO priority interval not suitable for this test\n",
  79               fifo_min, fifo_max);
  80       exit (0);
  81     }
  82
  83   struct sched_param sp;
  84   memset (&sp, 0, sizeof (sp));
  85   sp.sched_priority = 4;
  86   int e = pthread_setschedparam (pthread_self (), SCHED_FIFO, &sp);
  87   if (e != 0)
  88     {
  89       errno = e;
  90       printf ("cannot set scheduling params: %m\n");
  91       exit (0);
  92     }
  93 }