File: tst-malloc-thread-exit.c

package info (click to toggle)
glibc 2.28-8
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, experimental, sid
  • size: 271,788 kB
  • sloc: ansic: 1,008,637; asm: 259,607; makefile: 11,271; sh: 10,477; python: 6,910; cpp: 4,992; perl: 2,258; awk: 2,005; yacc: 290; pascal: 182; sed: 73
file content (137 lines) | stat: -rw-r--r-- 4,046 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/* Test malloc with concurrent thread termination.
   Copyright (C) 2015-2018 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/>.  */

/* This thread spawns a number of outer threads, equal to the arena
   limit.  The outer threads run a loop which start and join two
   different kinds of threads: the first kind allocates (attaching an
   arena to the thread; malloc_first_thread) and waits, the second
   kind waits and allocates (wait_first_threads).  Both kinds of
   threads exit immediately after waiting.  The hope is that this will
   exhibit races in thread termination and arena management,
   particularly related to the arena free list.  */

#include <errno.h>
#include <malloc.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <support/support.h>
#include <support/xthread.h>
#include <support/test-driver.h>

static bool termination_requested;
static int inner_thread_count = 4;
static size_t malloc_size = 32;

static void
__attribute__ ((noinline, noclone))
unoptimized_free (void *ptr)
{
  free (ptr);
}

static void *
malloc_first_thread (void * closure)
{
  pthread_barrier_t *barrier = closure;
  void *ptr = xmalloc (malloc_size);
  xpthread_barrier_wait (barrier);
  unoptimized_free (ptr);
  return NULL;
}

static void *
wait_first_thread (void * closure)
{
  pthread_barrier_t *barrier = closure;
  xpthread_barrier_wait (barrier);
  void *ptr = xmalloc (malloc_size);
  unoptimized_free (ptr);
  return NULL;
}

static void *
outer_thread (void *closure)
{
  pthread_t *threads = xcalloc (sizeof (*threads), inner_thread_count);
  while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
    {
      pthread_barrier_t barrier;
      xpthread_barrier_init (&barrier, NULL, inner_thread_count + 1);
      for (int i = 0; i < inner_thread_count; ++i)
        {
          void *(*func) (void *);
          if ((i  % 2) == 0)
            func = malloc_first_thread;
          else
            func = wait_first_thread;
          threads[i] = xpthread_create (NULL, func, &barrier);
        }
      xpthread_barrier_wait (&barrier);
      for (int i = 0; i < inner_thread_count; ++i)
        xpthread_join (threads[i]);
      xpthread_barrier_destroy (&barrier);
    }

  free (threads);

  return NULL;
}

static int
do_test (void)
{
  /* The number of threads should be smaller than the number of
     arenas, so that there will be some free arenas to add to the
     arena free list.  */
  enum { outer_thread_count = 2 };
  if (mallopt (M_ARENA_MAX, 8) == 0)
    {
      printf ("error: mallopt (M_ARENA_MAX) failed\n");
      return 1;
    }

  /* Leave some room for shutting down all threads gracefully.  */
  int timeout = 3;
  if (timeout > DEFAULT_TIMEOUT)
    timeout = DEFAULT_TIMEOUT - 1;

  pthread_t *threads = xcalloc (sizeof (*threads), outer_thread_count);
  for (long i = 0; i < outer_thread_count; ++i)
    threads[i] = xpthread_create (NULL, outer_thread, NULL);

  struct timespec ts = {timeout, 0};
  if (nanosleep (&ts, NULL))
    {
      printf ("error: error: nanosleep: %m\n");
      abort ();
    }

  __atomic_store_n (&termination_requested, true, __ATOMIC_RELAXED);

  for (long i = 0; i < outer_thread_count; ++i)
    xpthread_join (threads[i]);
  free (threads);

  return 0;
}

#include <support/test-driver.c>