nptl/tst-cond18.c

   1 /* Copyright (C) 2004-2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <pthread.h>
  22 #include <stdbool.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26
  27 pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
  28 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
  29 bool exiting;
  30 int fd, count, spins, nn;
  31
  32 void *
  33 tf (void *id)
  34 {
  35   pthread_mutex_lock (&lock);
  36
  37   if ((long) id == 0)
  38     {
  39       while (!exiting)
  40         {
  41           if ((spins++ % 1000) == 0)
  42             write (fd, ".", 1);
  43           pthread_mutex_unlock (&lock);
  44
  45           pthread_mutex_lock (&lock);
  46           int njobs = rand () % (count + 1);
  47           nn = njobs;
  48           if ((rand () % 30) == 0)
  49             pthread_cond_broadcast (&cv);
  50           else
  51             while (njobs--)
  52               pthread_cond_signal (&cv);
  53         }
  54
  55       pthread_cond_broadcast (&cv);
  56     }
  57   else
  58     {
  59       while (!exiting)
  60         {
  61           while (!nn && !exiting)
  62             pthread_cond_wait (&cv, &lock);
  63           --nn;
  64           pthread_mutex_unlock (&lock);
  65
  66           pthread_mutex_lock (&lock);
  67         }
  68     }
  69
  70   pthread_mutex_unlock (&lock);
  71   return NULL;
  72 }
  73
  74 int
  75 do_test (void)
  76 {
  77   fd = open ("/dev/null", O_WRONLY);
  78   if (fd < 0)
  79     {
  80       printf ("couldn't open /dev/null, %m\n");
  81       return 1;
  82     }
  83
  84   count = sysconf (_SC_NPROCESSORS_ONLN);
  85   if (count <= 0)
  86     count = 1;
  87   count *= 8;
  88
  89   pthread_t th[count + 1];
  90   pthread_attr_t attr;
  91   int i, ret, sz;
  92   pthread_attr_init (&attr);
  93   sz = __getpagesize ();
  94   if (sz < PTHREAD_STACK_MIN)
  95           sz = PTHREAD_STACK_MIN;
  96   pthread_attr_setstacksize (&attr, sz);
  97
  98   for (i = 0; i <= count; ++i)
  99     if ((ret = pthread_create (&th[i], &attr, tf, (void *) (long) i)) != 0)
 100       {
 101         errno = ret;
 102         printf ("pthread_create %d failed: %m\n", i);
 103         return 1;
 104       }
 105
 106   struct timespec ts = { .tv_sec = 20, .tv_nsec = 0 };
 107   while (nanosleep (&ts, &ts) != 0);
 108
 109   pthread_mutex_lock (&lock);
 110   exiting = true;
 111   pthread_mutex_unlock (&lock);
 112
 113   for (i = 0; i < count; ++i)
 114     pthread_join (th[i], NULL);
 115
 116   close (fd);
 117   return 0;
 118 }
 119
 120 #define TEST_FUNCTION do_test ()
 121 #define TIMEOUT 40
 122 #include "../test-skeleton.c"