gdb/testsuite/gdb.threads/pending-fork-event.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2021 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 <assert.h>
  21
  22 static volatile int release_forking_thread = 0;
  23 static int x;
  24 static pthread_barrier_t barrier;
  25
  26 static void
  27 break_here (void)
  28 {
  29   x++;
  30 }
  31
  32 static void
  33 do_fork (void)
  34 {
  35   pthread_barrier_wait (&barrier);
  36
  37   while (!release_forking_thread);
  38
  39   if (FORK_FUNCTION () == 0)
  40     _exit (0);
  41
  42 }
  43
  44 static void *
  45 thread_func (void *p)
  46 {
  47 #if defined(MAIN_THREAD_FORKS)
  48   break_here ();
  49 #elif defined(OTHER_THREAD_FORKS)
  50   do_fork ();
  51 #else
  52 # error "MAIN_THREAD_FORKS or OTHER_THREAD_FORKS must be defined"
  53 #endif
  54 }
  55
  56
  57 int
  58 main (void)
  59 {
  60   pthread_t thread;
  61   int ret;
  62
  63   pthread_barrier_init (&barrier, NULL, 2);
  64
  65   alarm (30);
  66   ret = pthread_create (&thread, NULL, thread_func, NULL);
  67   assert (ret == 0);
  68
  69   pthread_barrier_wait (&barrier);
  70
  71 #if defined(MAIN_THREAD_FORKS)
  72   do_fork ();
  73 #elif defined(OTHER_THREAD_FORKS)
  74   break_here ();
  75 #else
  76 # error "MAIN_THREAD_FORKS or OTHER_THREAD_FORKS must be defined"
  77 #endif
  78
  79   pthread_join (thread, NULL);
  80
  81   return 0;
  82 }