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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2008-2024 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 <assert.h>
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <errno.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26
  27 #define NUMTHREADS 10
  28
  29 volatile int done = 0;
  30 static pthread_barrier_t barrier;
  31
  32 static void *
  33 start (void *arg)
  34 {
  35   while (!done)
  36     usleep (100);
  37   assert (0);
  38   return arg;
  39 }
  40
  41 void *
  42 thread_function (void *arg)
  43 {
  44   int x = * (int *) arg;
  45
  46   printf ("Thread <%d> executing\n", x);
  47
  48   pthread_barrier_wait (&barrier);
  49
  50   while (!done)
  51     usleep (100);
  52
  53   return NULL;
  54 }
  55
  56 void *
  57 thread_forker (void *arg)
  58 {
  59   int x = * (int *) arg;
  60   pid_t pid;
  61   int rv;
  62   int i;
  63   pthread_t thread;
  64
  65   printf ("Thread forker <%d> executing\n", x);
  66
  67   pthread_barrier_wait (&barrier);
  68
  69   switch ((pid = fork ()))
  70     {
  71     case -1:
  72       assert (0);
  73     default:
  74       wait (&rv);
  75       done = 1;
  76       break;
  77     case 0:
  78       i = pthread_create (&thread, NULL, start, NULL);
  79       assert (i == 0);
  80       i = pthread_join (thread, NULL);
  81       assert (i == 0);
  82
  83       assert (0);
  84     }
  85
  86   return NULL;
  87 }
  88
  89 int
  90 main (void)
  91 {
  92   pthread_t threads[NUMTHREADS];
  93   int args[NUMTHREADS];
  94   int i, j;
  95
  96   alarm (600);
  97
  98   i = pthread_barrier_init (&barrier, NULL, NUMTHREADS);
  99   assert (i == 0);
 100
 101   /* Create a few threads that do mostly nothing, and then one that
 102      forks.  */
 103   for (j = 0; j < NUMTHREADS - 1; ++j)
 104     {
 105       args[j] = j;
 106       pthread_create (&threads[j], NULL, thread_function, &args[j]);
 107     }
 108
 109   args[j] = j;
 110   pthread_create (&threads[j], NULL, thread_forker, &args[j]);
 111
 112   for (j = 0; j < NUMTHREADS; ++j)
 113     {
 114       pthread_join (threads[j], NULL);
 115     }
 116
 117   return 0;
 118 }