gdb/testsuite/gdb.threads/main-thread-exit-during-detach.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2023-2024 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 #include <pthread.h>
  19 #include <unistd.h>
  20
  21 /* This is set from GDB to allow the main thread to exit.  */
  22
  23 volatile int dont_exit_just_yet = 1;
  24
  25 /* Somewhere to place a breakpoint.  */
  26
  27 void
  28 breakpt ()
  29 {
  30   /* Just spin.  When the test is started under GDB we never enter the spin
  31      loop, but when we attach, the worker thread will be spinning here.  */
  32   while (dont_exit_just_yet)
  33     sleep (1);
  34 }
  35
  36 /* Thread function, doesn't do anything but hit a breakpoint.  */
  37
  38 void *
  39 thread_worker (void *arg)
  40 {
  41   breakpt ();
  42   return NULL;
  43 }
  44
  45 int
  46 main ()
  47 {
  48   pthread_t thr;
  49
  50   alarm (300);
  51
  52   /* Create a thread.  */
  53   pthread_create (&thr, NULL, thread_worker, NULL);
  54   pthread_detach (thr);
  55
  56   /* Spin until GDB releases us.  */
  57   while (dont_exit_just_yet)
  58     sleep (1);
  59
  60   _exit (0);
  61 }