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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2021-2024 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 #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   while (!release_forking_thread);
  36
  37   if (FORK_FUNCTION () == 0)
  38     {
  39       /* We create the file in a separate program that we exec: if FORK_FUNCTION
  40          is vfork, we shouldn't do anything more than an exec.  */
  41       execl (TOUCH_FILE_BIN, TOUCH_FILE_BIN, NULL);
  42     }
  43
  44 }
  45
  46 static void *
  47 thread_func (void *p)
  48 {
  49   pthread_barrier_wait (&barrier);
  50
  51 #if defined(MAIN_THREAD_FORKS)
  52   break_here ();
  53 #elif defined(OTHER_THREAD_FORKS)
  54   do_fork ();
  55 #else
  56 # error "MAIN_THREAD_FORKS or OTHER_THREAD_FORKS must be defined"
  57 #endif
  58 }
  59
  60
  61 int
  62 main (void)
  63 {
  64   pthread_t thread;
  65   int ret;
  66
  67   pthread_barrier_init (&barrier, NULL, 2);
  68
  69   alarm (30);
  70   ret = pthread_create (&thread, NULL, thread_func, NULL);
  71   assert (ret == 0);
  72
  73   pthread_barrier_wait (&barrier);
  74
  75 #if defined(MAIN_THREAD_FORKS)
  76   do_fork ();
  77 #elif defined(OTHER_THREAD_FORKS)
  78   break_here ();
  79 #else
  80 # error "MAIN_THREAD_FORKS or OTHER_THREAD_FORKS must be defined"
  81 #endif
  82
  83   pthread_join (thread, NULL);
  84
  85   return 0;
  86 }