gdb/testsuite/gdb.base/watch_thread_num.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002-2022 Free Software Foundation, Inc.
   4
   5    Copyright 1992, 1993, 1994, 1995, 1999, 2002, 2003, 2007, 2008, 2009
   6    Free Software Foundation, Inc.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21    This file is copied from schedlock.c.  */
  22
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26 #include <pthread.h>
  27
  28 void *thread_function (void *arg); /* Pointer to function executed by each thread */
  29
  30 static pthread_barrier_t threads_started_barrier;
  31
  32 static pthread_barrier_t threads_started_barrier2;
  33
  34 #define NUM 15
  35
  36 static int num_threads = NUM;
  37
  38 static unsigned int shared_var = 1;
  39
  40 int main () {
  41     int res;
  42     pthread_t threads[NUM];
  43     void *thread_result;
  44     long i;
  45
  46     pthread_barrier_init (&threads_started_barrier, NULL, NUM + 1);
  47
  48     pthread_barrier_init (&threads_started_barrier2, NULL, 2);
  49
  50     for (i = 0; i < NUM; i++)
  51       {
  52         res = pthread_create (&threads[i],
  53                              NULL,
  54                              thread_function,
  55                              (void *) i);
  56       }
  57
  58     pthread_barrier_wait (&threads_started_barrier);
  59
  60     pthread_barrier_wait (&threads_started_barrier2);  /* all threads started */
  61
  62     pthread_join (threads[0], NULL);
  63
  64     sleep (180);  /* first child thread exited */
  65
  66     exit (EXIT_SUCCESS);
  67 }
  68
  69 void
  70 loop (void)
  71 {
  72 }
  73
  74 void *thread_function (void *arg) {
  75     int my_number = (long) arg;
  76
  77     pthread_barrier_wait (&threads_started_barrier);
  78
  79     if (my_number > 0)
  80       {
  81         /* Don't run forever.  Run just short of it :)  */
  82         while (shared_var > 0)
  83           {
  84             shared_var++;
  85             usleep (1); /* Loop increment.  */
  86             loop ();
  87           }
  88       }
  89     else
  90       pthread_barrier_wait (&threads_started_barrier2);
  91
  92     pthread_exit (NULL);
  93 }
  94