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glibc/malloc/tst-malloc-thread-exit.c
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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 <malloc.h> | |
#include <pthread.h> | |
#include <stdbool.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" | |
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 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 > TIMEOUT) | |
timeout = TIMEOUT - 1; | |
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; | |
} |