gdb/testsuite/gdb.threads/process-exit-status-is-leader-exit-status.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 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 #include <pthread.h>
  19 #include <unistd.h>
  20 #include <sys/syscall.h>
  21
  22 #define NUM_THREADS 32
  23
  24 pthread_barrier_t barrier;
  25
  26 static void
  27 do_exit (int exitcode)
  28 {
  29   /* Synchronize all threads up to here so that they all exit at
  30      roughly the same time.  */
  31   pthread_barrier_wait (&barrier);
  32
  33   /* All threads exit with SYS_exit, even the main thread, to avoid
  34      exiting with a group-exit syscall, as that syscall changes the
  35      exit status of all still-alive threads, thus potentially masking
  36      a bug.  */
  37   syscall (SYS_exit, exitcode);
  38 }
  39
  40 static void *
  41 start (void *arg)
  42 {
  43   int thread_return_value = *(int *) arg;
  44
  45   do_exit (thread_return_value);
  46 }
  47
  48 int
  49 main(void)
  50 {
  51   pthread_t threads[NUM_THREADS];
  52   int thread_return_val[NUM_THREADS];
  53   int i;
  54
  55   pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1);
  56
  57   for (i = 0; i < NUM_THREADS; ++i)
  58     {
  59       thread_return_val[i] = i + 2;
  60       pthread_create (&threads[i], NULL, start, &thread_return_val[i]);
  61     }
  62
  63   do_exit (1);
  64 }