gdb/testsuite/gdb.mi/mi-cmd-user-context.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 #include <stdint.h>
  23
  24 #define NUM_THREADS 2
  25
  26 static volatile int unblock_main[NUM_THREADS];
  27
  28 static void
  29 child_sub_function (int child_idx)
  30 {
  31   volatile int dummy = 0;
  32
  33   unblock_main[child_idx] = 1;
  34
  35   while (1)
  36     /* Dummy loop body to allow setting breakpoint.  */
  37     dummy = !dummy; /* thread loop line */
  38 }
  39
  40 static void *
  41 child_function (void *args)
  42 {
  43   int child_idx = (int) (uintptr_t) args;
  44
  45   child_sub_function (child_idx); /* thread caller line */
  46
  47   return NULL;
  48 }
  49
  50 int
  51 main (void)
  52 {
  53   int i = 0;
  54   pthread_t threads[NUM_THREADS];
  55
  56   /* Make the test exit eventually.  */
  57   alarm (20);
  58
  59   for (i = 0; i < NUM_THREADS; i++)
  60     pthread_create (&threads[i], NULL, child_function, (void *) (uintptr_t) i);
  61
  62   /* Wait for child threads to reach child_sub_function.  */
  63   for (i = 0; i < NUM_THREADS; i++)
  64     while (!unblock_main[i])
  65       ;
  66
  67   volatile int dummy = 0;
  68   while (1)
  69     /* Dummy loop body to allow setting breakpoint.  */
  70     dummy = !dummy; /* main break line */
  71
  72   return 0;
  73 }