138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
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/* Test malloc with concurrent thread termination.
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Copyright (C) 2015-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This thread spawns a number of outer threads, equal to the arena
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limit. The outer threads run a loop which start and join two
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different kinds of threads: the first kind allocates (attaching an
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arena to the thread; malloc_first_thread) and waits, the second
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kind waits and allocates (wait_first_threads). Both kinds of
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threads exit immediately after waiting. The hope is that this will
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exhibit races in thread termination and arena management,
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particularly related to the arena free list. */
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#include <errno.h>
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#include <malloc.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <support/support.h>
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#include <support/xthread.h>
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#include <support/test-driver.h>
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static bool termination_requested;
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static int inner_thread_count = 4;
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static size_t malloc_size = 32;
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static void
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__attribute__ ((noinline, noclone))
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unoptimized_free (void *ptr)
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{
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free (ptr);
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}
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static void *
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malloc_first_thread (void * closure)
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{
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pthread_barrier_t *barrier = closure;
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void *ptr = xmalloc (malloc_size);
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xpthread_barrier_wait (barrier);
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unoptimized_free (ptr);
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return NULL;
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}
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static void *
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wait_first_thread (void * closure)
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{
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pthread_barrier_t *barrier = closure;
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xpthread_barrier_wait (barrier);
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void *ptr = xmalloc (malloc_size);
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unoptimized_free (ptr);
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return NULL;
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}
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static void *
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outer_thread (void *closure)
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{
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pthread_t *threads = xcalloc (sizeof (*threads), inner_thread_count);
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while (!__atomic_load_n (&termination_requested, __ATOMIC_RELAXED))
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{
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pthread_barrier_t barrier;
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xpthread_barrier_init (&barrier, NULL, inner_thread_count + 1);
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for (int i = 0; i < inner_thread_count; ++i)
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{
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void *(*func) (void *);
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if ((i % 2) == 0)
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func = malloc_first_thread;
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else
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func = wait_first_thread;
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threads[i] = xpthread_create (NULL, func, &barrier);
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}
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xpthread_barrier_wait (&barrier);
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for (int i = 0; i < inner_thread_count; ++i)
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xpthread_join (threads[i]);
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xpthread_barrier_destroy (&barrier);
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}
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free (threads);
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return NULL;
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}
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static int
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do_test (void)
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{
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/* The number of threads should be smaller than the number of
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arenas, so that there will be some free arenas to add to the
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arena free list. */
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enum { outer_thread_count = 2 };
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if (mallopt (M_ARENA_MAX, 8) == 0)
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{
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printf ("error: mallopt (M_ARENA_MAX) failed\n");
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return 1;
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}
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/* Leave some room for shutting down all threads gracefully. */
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int timeout = 3;
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if (timeout > DEFAULT_TIMEOUT)
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timeout = DEFAULT_TIMEOUT - 1;
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pthread_t *threads = xcalloc (sizeof (*threads), outer_thread_count);
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for (long i = 0; i < outer_thread_count; ++i)
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threads[i] = xpthread_create (NULL, outer_thread, NULL);
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struct timespec ts = {timeout, 0};
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if (nanosleep (&ts, NULL))
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{
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printf ("error: error: nanosleep: %m\n");
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abort ();
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}
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__atomic_store_n (&termination_requested, true, __ATOMIC_RELAXED);
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for (long i = 0; i < outer_thread_count; ++i)
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xpthread_join (threads[i]);
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free (threads);
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return 0;
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}
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#include <support/test-driver.c>
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