/* Smoke test for malloc_info.

   Copyright (C) 2017-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* The purpose of this test is to provide a quick way to run

   malloc_info in a multi-threaded process.  */

#include <array_length.h>

#include <malloc.h>

#include <stdlib.h>

#include <support/support.h>

#include <support/xthread.h>

/* This barrier is used to have the main thread wait until the helper

   threads have performed their allocations.  */

static pthread_barrier_t barrier;

enum

  {

    /* Number of threads performing allocations.  */

    thread_count  = 4,

    /* Amount of memory allocation per thread.  This should be large

       enough to cause the allocation of multiple heaps per arena.  */

    per_thread_allocations

      = sizeof (void *) == 4 ? 16 * 1024 * 1024 : 128 * 1024 * 1024,

  };

static void *

allocation_thread_function (void *closure)

{

  struct list

  {

    struct list *next;

    long dummy[4];

  };

  struct list *head = NULL;

  size_t allocated = 0;

  while (allocated < per_thread_allocations)

    {

      struct list *new_head = xmalloc (sizeof (*new_head));

      allocated += sizeof (*new_head);

      new_head->next = head;

      head = new_head;

    }

  xpthread_barrier_wait (&barrier);

  /* Main thread prints first statistics here.  */

  xpthread_barrier_wait (&barrier);

  while (head != NULL)

    {

      struct list *next_head = head->next;

      free (head);

      head = next_head;

    }

  return NULL;

}

static int

do_test (void)

{

  xpthread_barrier_init (&barrier, NULL, thread_count + 1);

  pthread_t threads[thread_count];

  for (size_t i = 0; i < array_length (threads); ++i)

    threads[i] = xpthread_create (NULL, allocation_thread_function, NULL);

  xpthread_barrier_wait (&barrier);

  puts ("info: After allocation:");

  malloc_info (0, stdout);

  xpthread_barrier_wait (&barrier);

  for (size_t i = 0; i < array_length (threads); ++i)

    xpthread_join (threads[i]);

  puts ("\ninfo: After deallocation:");

  malloc_info (0, stdout);

  return 0;

}

#include <support/test-driver.c>