Home | History | Annotate | Line # | Download | only in gdb.threads 
      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2015-2024 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 <assert.h>
     19 #include <pthread.h>
     20 #include <unistd.h>
     21 #include <stdio.h>
     22 #include <sys/types.h>
     23 #include <sys/wait.h>
     24 
     25 
     26 /* Number of times the main process forks.  */
     27 #define NFORKS 10
     28 
     29 /* Number of threads by each fork child.  */
     30 #define NTHREADS 10
     31 
     32 static void *
     33 thread_func (void *arg)
     34 {
     35   /* Empty.  */
     36   return NULL;
     37 }
     38 
     39 static void
     40 fork_child (void)
     41 {
     42   pthread_t threads[NTHREADS];
     43   int i;
     44   int ret;
     45 
     46   for (i = 0; i < NTHREADS; i++)
     47     {
     48       ret = pthread_create (&threads[i], NULL, thread_func, NULL);
     49       assert (ret == 0);
     50     }
     51 
     52   for (i = 0; i < NTHREADS; i++)
     53     {
     54       ret = pthread_join (threads[i], NULL);
     55       assert (ret == 0);
     56     }
     57 }
     58 
     59 int
     60 main (void)
     61 {
     62   pid_t childs[NFORKS];
     63   int i;
     64   int status;
     65   int num_exited = 0;
     66 
     67   /* Don't run forever if the wait loop below gets stuck.  */
     68   alarm (180);
     69 
     70   for (i = 0; i < NFORKS; i++)
     71     {
     72       pid_t pid;
     73 
     74       pid = fork ();
     75 
     76       if (pid > 0)
     77 	{
     78 	  /* Parent.  */
     79 	  childs[i] = pid;
     80 	}
     81       else if (pid == 0)
     82 	{
     83 	  /* Child.  */
     84 	  fork_child ();
     85 	  return 0;
     86 	}
     87       else
     88 	{
     89 	  perror ("fork");
     90 	  return 1;
     91 	}
     92     }
     93 
     94   while (num_exited != NFORKS)
     95     {
     96       pid_t pid = wait (&status);
     97 
     98       if (pid == -1)
     99 	{
    100 	  perror ("wait");
    101 	  return 1;
    102 	}
    103 
    104       if (WIFEXITED (status))
    105 	{
    106 	  num_exited++;
    107 	}
    108       else
    109 	{
    110 	  printf ("Hmm, unexpected wait status 0x%x from child %d\n", status,
    111 		  pid);
    112 	}
    113     }
    114 
    115   return 0;
    116 }
    117