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/* Test malloc with concurrent thread termination.
Copyright (C) 2015-2025 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
<https://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_optimization_barrier__
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>
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