nptl/tst-barrier5.c

   1 /* This tests the barrier reset mechanism.
   2    Copyright (C) 2004-2021 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 <stdio.h>
  22 #include <stdlib.h>
  23 #include <internaltypes.h>
  24
  25
  26 static pthread_barrier_t b1;
  27 static pthread_barrier_t b2;
  28
  29
  30 #define N 20
  31 #define ROUNDS_PER_RUN 20
  32 #define START ((BARRIER_IN_THRESHOLD / N - ROUNDS_PER_RUN / 2) * N)
  33
  34 static void *
  35 tf (void *arg)
  36 {
  37   int runs = 0;
  38
  39   while (runs++ < 30)
  40     {
  41       /* In each run, we execute a number of rounds and initialize the barrier
  42          so that we will go over the reset threshold with those rounds.  */
  43       for (int rounds = 0; rounds < ROUNDS_PER_RUN; rounds++)
  44         pthread_barrier_wait (&b1);
  45
  46       if (pthread_barrier_wait (&b1) == PTHREAD_BARRIER_SERIAL_THREAD)
  47         {
  48           pthread_barrier_destroy (&b1);
  49           if (pthread_barrier_init (&b1, NULL, N) != 0)
  50             {
  51               puts ("tf: 1st barrier_init failed");
  52               exit (1);
  53             }
  54           puts ("b1 reinitialized");
  55           /* Trigger a reset.  */
  56           struct pthread_barrier *bar = (struct pthread_barrier *) &b1;
  57           bar->in = START;
  58           bar->out = START;
  59           /* We deliberately don't set bar->current_round so that we also
  60              test whether the helping for the updates of current_round
  61              works correctly.  */
  62         }
  63
  64       /* Same as above, just for b2.  */
  65       for (int rounds = 0; rounds < ROUNDS_PER_RUN; rounds++)
  66         pthread_barrier_wait (&b2);
  67
  68       if (pthread_barrier_wait (&b2) == PTHREAD_BARRIER_SERIAL_THREAD)
  69         {
  70           pthread_barrier_destroy (&b2);
  71           if (pthread_barrier_init (&b2, NULL, N) != 0)
  72             {
  73               puts ("tf: 2nd barrier_init failed");
  74               exit (1);
  75             }
  76           puts ("b2 reinitialized");
  77           /* Trigger a reset.  See above.  */
  78           struct pthread_barrier *bar = (struct pthread_barrier *) &b2;
  79           bar->in = START;
  80           bar->out = START;
  81         }
  82     }
  83
  84   return NULL;
  85 }
  86
  87
  88 static int
  89 do_test (void)
  90 {
  91   pthread_attr_t at;
  92   int cnt;
  93
  94   if (pthread_attr_init (&at) != 0)
  95     {
  96       puts ("attr_init failed");
  97       return 1;
  98     }
  99
 100   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
 101     {
 102       puts ("attr_setstacksize failed");
 103       return 1;
 104     }
 105
 106   if (pthread_barrier_init (&b1, NULL, N) != 0)
 107     {
 108       puts ("1st barrier_init failed");
 109       return 1;
 110     }
 111
 112   if (pthread_barrier_init (&b2, NULL, N) != 0)
 113     {
 114       puts ("2nd barrier_init failed");
 115       return 1;
 116     }
 117
 118   pthread_t th[N - 1];
 119   for (cnt = 0; cnt < N - 1; ++cnt)
 120     if (pthread_create (&th[cnt], &at, tf, NULL) != 0)
 121       {
 122         puts ("pthread_create failed");
 123         return 1;
 124       }
 125
 126   if (pthread_attr_destroy (&at) != 0)
 127     {
 128       puts ("attr_destroy failed");
 129       return 1;
 130     }
 131
 132   tf (NULL);
 133
 134   for (cnt = 0; cnt < N - 1; ++cnt)
 135     if (pthread_join (th[cnt], NULL) != 0)
 136       {
 137         puts ("pthread_join failed");
 138         return 1;
 139       }
 140
 141   return 0;
 142 }
 143
 144 #define TEST_FUNCTION do_test ()
 145 #include "../test-skeleton.c"