gdb/testsuite/gdb.threads/inf-thr-count.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2023 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 <assert.h>
  20 #include <unistd.h>
  21
  22 /* Set to 0 by GDB to cause the inferior to drop out of a spin loop.  */
  23 volatile int spin = 1;
  24
  25 /* Set by the inferior to communicate to GDB what stage of the test we are
  26    in.  Initially 0, but set to 1 once a new thread has been created.  Then
  27    set to 2 once the extra thread has exited.  */
  28 volatile int stage = 0;
  29
  30 /* New thread worker function.  Just spins until GDB tells it to exit.  */
  31 void *
  32 thread_func (void *arg)
  33 {
  34   assert (arg == NULL);
  35
  36   stage = 1;
  37
  38   while (spin)
  39     sleep (1);
  40
  41   return NULL;
  42 }
  43
  44 /* Somewhere to place a breakpoint.  */
  45 void
  46 breakpt ()
  47 {
  48   /* Nothing.  */
  49 }
  50
  51 /* Create a new test that spins until GDB tells it to exit.  Then, once the
  52    new thread has exited, this thread spins until GDB tells us to exit.  */
  53 int
  54 main ()
  55 {
  56   alarm (600);
  57
  58   breakpt ();
  59
  60   pthread_t thr;
  61   int res;
  62
  63   res = pthread_create (&thr, NULL, thread_func, NULL);
  64   assert (res == 0);
  65
  66   void *retval;
  67   res = pthread_join (thr, &retval);
  68   assert (res == 0);
  69
  70   spin = 1;
  71   stage = 2;
  72
  73   while (spin)
  74     sleep (1);
  75
  76   breakpt ();
  77
  78   return 0;
  79 }
  80