gdb/testsuite/gdb.threads/manythreads.c

   1 /* Manythreads test program.
   2    Copyright 2004-2024 Free Software Foundation, Inc.
   3
   4    Written by Jeff Johnston <jjohnstn@redhat.com>
   5    Contributed by Red Hat
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include <pthread.h>
  23 #ifdef DEBUG
  24 #include <stdio.h>
  25 #endif
  26 #include <limits.h>
  27
  28 void *
  29 thread_function (void *arg)
  30 {
  31   int x = * (int *) arg;
  32
  33 #ifdef DEBUG
  34   printf ("Thread <%d> executing\n", x);
  35 #endif /* DEBUG */
  36
  37   return NULL;
  38 }
  39
  40 int
  41 main (int argc, char **argv)
  42 {
  43   pthread_attr_t attr;
  44   pthread_t threads[256];
  45   int args[256];
  46   int i, j;
  47
  48   pthread_attr_init (&attr);
  49
  50 #ifdef PTHREAD_STACK_MIN
  51   pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN);
  52 #endif
  53
  54   /* Create a ton of quick-executing threads, then wait for them to
  55      complete.  */
  56   for (i = 0; i < 1000; ++i)
  57     {
  58       for (j = 0; j < 256; ++j)
  59         {
  60           args[j] = i * 1000 + j;
  61           pthread_create (&threads[j], &attr, thread_function, &args[j]);
  62         }
  63
  64       for (j = 0; j < 256; ++j)
  65         {
  66           pthread_join (threads[j], NULL);
  67         }
  68     }
  69
  70   pthread_attr_destroy (&attr);
  71
  72   return 0;
  73 }