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/* Test malloc with concurrent thread termination.
Copyright (C) 2015-2016 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 <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define TIMEOUT 7
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 = malloc (malloc_size);
if (ptr == NULL)
{
printf ("error: malloc: %m\n");
abort ();
}
int ret = pthread_barrier_wait (barrier);
if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
{
errno = ret;
printf ("error: pthread_barrier_wait: %m\n");
abort ();
}
unoptimized_free (ptr);
return NULL;
}
static void *
wait_first_thread (void * closure)
{
pthread_barrier_t *barrier = closure;
int ret = pthread_barrier_wait (barrier);
if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
{
errno = ret;
printf ("error: pthread_barrier_wait: %m\n");
abort ();
}
void *ptr = malloc (malloc_size);
if (ptr == NULL)
{
printf ("error: malloc: %m\n");
abort ();
}
unoptimized_free (ptr);
return NULL;
}
static void *
outer_thread (void *closure)
{
pthread_t *threads = calloc (sizeof (*threads), inner_thread_count);
if (threads == NULL)
{
printf ("error: calloc: %m\n");
abort ();
}
while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
{
pthread_barrier_t barrier;
int ret = pthread_barrier_init (&barrier, NULL, inner_thread_count + 1);
if (ret != 0)
{
errno = ret;
printf ("pthread_barrier_init: %m\n");
abort ();
}
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;
ret = pthread_create (threads + i, NULL, func, &barrier);
if (ret != 0)
{
errno = ret;
printf ("error: pthread_create: %m\n");
abort ();
}
}
ret = pthread_barrier_wait (&barrier);
if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
{
errno = ret;
printf ("pthread_wait: %m\n");
abort ();
}
for (int i = 0; i < inner_thread_count; ++i)
{
ret = pthread_join (threads[i], NULL);
if (ret != 0)
{
ret = errno;
printf ("error: pthread_join: %m\n");
abort ();
}
}
ret = pthread_barrier_destroy (&barrier);
if (ret != 0)
{
ret = errno;
printf ("pthread_barrier_destroy: %m\n");
abort ();
}
}
free (threads);
return NULL;
}
static int
do_test (void)
{
/* The number of top-level threads should be equal to the number of
arenas. See arena_get2. */
long outer_thread_count = sysconf (_SC_NPROCESSORS_ONLN);
if (outer_thread_count >= 1)
{
/* See NARENAS_FROM_NCORES in malloc.c. */
if (sizeof (long) == 4)
outer_thread_count *= 2;
else
outer_thread_count *= 8;
}
/* Leave some room for shutting down all threads gracefully. */
int timeout = TIMEOUT - 2;
pthread_t *threads = calloc (sizeof (*threads), outer_thread_count);
if (threads == NULL)
{
printf ("error: calloc: %m\n");
abort ();
}
for (long i = 0; i < outer_thread_count; ++i)
{
int ret = pthread_create (threads + i, NULL, outer_thread, NULL);
if (ret != 0)
{
errno = ret;
printf ("error: pthread_create: %m\n");
abort ();
}
}
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)
{
int ret = pthread_join (threads[i], NULL);
if (ret != 0)
{
errno = ret;
printf ("error: pthread_join: %m\n");
abort ();
}
}
free (threads);
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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