sysdeps/pthread/tst-cond16.c

   1 /* Copyright (C) 2004-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <pthread.h>
  21 #include <stdbool.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
  27 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
  28 bool n, exiting;
  29 FILE *f;
  30 enum { count = 8 };             /* Number of worker threads.  */
  31
  32 void *
  33 tf (void *dummy)
  34 {
  35   bool loop = true;
  36
  37   while (loop)
  38     {
  39       pthread_mutex_lock (&lock);
  40       while (n && !exiting)
  41         pthread_cond_wait (&cv, &lock);
  42       n = true;
  43       pthread_mutex_unlock (&lock);
  44
  45       fputs (".", f);
  46
  47       pthread_mutex_lock (&lock);
  48       n = false;
  49       if (exiting)
  50         loop = false;
  51 #ifdef UNLOCK_AFTER_BROADCAST
  52       pthread_cond_broadcast (&cv);
  53       pthread_mutex_unlock (&lock);
  54 #else
  55       pthread_mutex_unlock (&lock);
  56       pthread_cond_broadcast (&cv);
  57 #endif
  58     }
  59
  60   return NULL;
  61 }
  62
  63 int
  64 do_test (void)
  65 {
  66   f = fopen ("/dev/null", "w");
  67   if (f == NULL)
  68     {
  69       printf ("couldn't open /dev/null, %m\n");
  70       return 1;
  71     }
  72
  73   pthread_t th[count];
  74   pthread_attr_t attr;
  75   int i, ret, sz;
  76   pthread_attr_init (&attr);
  77   sz = sysconf (_SC_PAGESIZE);
  78 #ifdef PTHREAD_STACK_MIN
  79   if (sz < PTHREAD_STACK_MIN)
  80           sz = PTHREAD_STACK_MIN;
  81 #endif
  82   pthread_attr_setstacksize (&attr, sz);
  83   for (i = 0; i < count; ++i)
  84     if ((ret = pthread_create (&th[i], &attr, tf, NULL)) != 0)
  85       {
  86         errno = ret;
  87         printf ("pthread_create %d failed: %m\n", i);
  88         return 1;
  89       }
  90
  91   struct timespec ts = { .tv_sec = 20, .tv_nsec = 0 };
  92   while (nanosleep (&ts, &ts) != 0);
  93
  94   pthread_mutex_lock (&lock);
  95   exiting = true;
  96   pthread_mutex_unlock (&lock);
  97
  98   for (i = 0; i < count; ++i)
  99     pthread_join (th[i], NULL);
 100
 101   fclose (f);
 102   return 0;
 103 }
 104
 105 #define TEST_FUNCTION do_test ()
 106 #define TIMEOUT 40
 107 #include "../test-skeleton.c"