gdb/testsuite/gdb.mi/user-selected-context-sync.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2016-2022 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 */
  19
  20 #include <pthread.h>
  21 #include <unistd.h>
  22
  23 #define NUM_THREADS 2
  24
  25 static pthread_barrier_t barrier;
  26
  27 static void
  28 child_sub_function (void)
  29 {
  30   volatile int dummy = 0;
  31   while (1)
  32     /* Dummy loop body to allow setting breakpoint.  */
  33     dummy = !dummy; /* thread loop line */
  34 }
  35
  36 static void *
  37 child_function (void *args)
  38 {
  39   pthread_barrier_wait (&barrier);
  40
  41   child_sub_function (); /* thread caller line */
  42
  43   return NULL;
  44 }
  45
  46 int
  47 main (void)
  48 {
  49   int i = 0;
  50   pthread_t threads[NUM_THREADS];
  51
  52   /* Make the test exit eventually.  */
  53   alarm (20);
  54
  55   /* Initialize the barrier, NUM_THREADS plus the main thread.  */
  56   pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1);
  57
  58   for (i = 0; i < NUM_THREADS; i++)
  59     pthread_create (&threads[i], NULL, child_function, NULL);
  60
  61   pthread_barrier_wait (&barrier);
  62
  63   volatile int dummy = 0;
  64   while (1)
  65     /* Dummy loop body to allow setting breakpoint.  */
  66     dummy = !dummy; /* main break line */
  67
  68   return 0;
  69 }