sysdeps/pthread/tst-cond16.c

   1 /* Copyright (C) 2004-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
   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 <limits.h>
  21 #include <pthread.h>
  22 #include <stdbool.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27 pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
  28 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
  29 bool n, exiting;
  30 FILE *f;
  31 enum { count = 8 };             /* Number of worker threads.  */
  32
  33 void *
  34 tf (void *dummy)
  35 {
  36   bool loop = true;
  37
  38   while (loop)
  39     {
  40       pthread_mutex_lock (&lock);
  41       while (n && !exiting)
  42         pthread_cond_wait (&cv, &lock);
  43       n = true;
  44       pthread_mutex_unlock (&lock);
  45
  46       fputs (".", f);
  47
  48       pthread_mutex_lock (&lock);
  49       n = false;
  50       if (exiting)
  51         loop = false;
  52 #ifdef UNLOCK_AFTER_BROADCAST
  53       pthread_cond_broadcast (&cv);
  54       pthread_mutex_unlock (&lock);
  55 #else
  56       pthread_mutex_unlock (&lock);
  57       pthread_cond_broadcast (&cv);
  58 #endif
  59     }
  60
  61   return NULL;
  62 }
  63
  64 int
  65 do_test (void)
  66 {
  67   f = fopen ("/dev/null", "w");
  68   if (f == NULL)
  69     {
  70       printf ("couldn't open /dev/null, %m\n");
  71       return 1;
  72     }
  73
  74   pthread_t th[count];
  75   pthread_attr_t attr;
  76   int i, ret, sz;
  77   pthread_attr_init (&attr);
  78   sz = sysconf (_SC_PAGESIZE);
  79 #ifdef PTHREAD_STACK_MIN
  80   if (sz < PTHREAD_STACK_MIN)
  81           sz = PTHREAD_STACK_MIN;
  82 #endif
  83   pthread_attr_setstacksize (&attr, sz);
  84   for (i = 0; i < count; ++i)
  85     if ((ret = pthread_create (&th[i], &attr, tf, NULL)) != 0)
  86       {
  87         errno = ret;
  88         printf ("pthread_create %d failed: %m\n", i);
  89         return 1;
  90       }
  91
  92   struct timespec ts = { .tv_sec = 20, .tv_nsec = 0 };
  93   while (nanosleep (&ts, &ts) != 0);
  94
  95   pthread_mutex_lock (&lock);
  96   exiting = true;
  97   pthread_mutex_unlock (&lock);
  98
  99   for (i = 0; i < count; ++i)
 100     pthread_join (th[i], NULL);
 101
 102   fclose (f);
 103   return 0;
 104 }
 105
 106 #define TEST_FUNCTION do_test ()
 107 #define TIMEOUT 40
 108 #include "../test-skeleton.c"