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/* Test with many dynamic TLS variables.
Copyright (C) 2016-2024 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 test intends to exercise dynamic TLS variable allocation. It
achieves this by combining dlopen (to avoid static TLS allocation
after static TLS resizing), many DSOs with a large variable (to
exceed the static TLS reserve), and an already-running thread (to
force full dynamic TLS initialization). */
#include "tst-tls-manydynamic.h"
#include <errno.h>
#include <dlfcn.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int do_test (void);
#include <support/xthread.h>
#include <support/test-driver.c>
void *handles[COUNT];
set_value_func set_value_funcs[COUNT];
get_value_func get_value_funcs[COUNT];
static void
init_functions (void)
{
for (int i = 0; i < COUNT; ++i)
{
/* Open the module. */
{
char soname[100];
snprintf (soname, sizeof (soname), "tst-tls-manydynamic%02dmod.so", i);
handles[i] = dlopen (soname, RTLD_LAZY);
if (handles[i] == NULL)
{
printf ("error: dlopen failed: %s\n", dlerror ());
exit (1);
}
}
/* Obtain the setter function. */
{
char fname[100];
snprintf (fname, sizeof (fname), "set_value_%02d", i);
void *func = dlsym (handles[i], fname);
if (func == NULL)
{
printf ("error: dlsym: %s\n", dlerror ());
exit (1);
}
set_value_funcs[i] = func;
}
/* Obtain the getter function. */
{
char fname[100];
snprintf (fname, sizeof (fname), "get_value_%02d", i);
void *func = dlsym (handles[i], fname);
if (func == NULL)
{
printf ("error: dlsym: %s\n", dlerror ());
exit (1);
}
get_value_funcs[i] = func;
}
}
}
static pthread_barrier_t barrier;
/* Running thread which forces real TLS initialization. */
static void *
blocked_thread_func (void *closure)
{
xpthread_barrier_wait (&barrier);
/* TLS test runs here in the main thread. */
xpthread_barrier_wait (&barrier);
return NULL;
}
static int
do_test (void)
{
{
int ret = pthread_barrier_init (&barrier, NULL, 2);
if (ret != 0)
{
errno = ret;
printf ("error: pthread_barrier_init: %m\n");
exit (1);
}
}
pthread_t blocked_thread = xpthread_create (NULL, blocked_thread_func, NULL);
xpthread_barrier_wait (&barrier);
init_functions ();
struct value values[COUNT];
/* Initialize the TLS variables. */
for (int i = 0; i < COUNT; ++i)
{
for (int j = 0; j < PER_VALUE_COUNT; ++j)
values[i].num[j] = rand ();
set_value_funcs[i] (&values[i]);
}
/* Read back their values to check that they do not overlap. */
for (int i = 0; i < COUNT; ++i)
{
struct value actual;
get_value_funcs[i] (&actual);
for (int j = 0; j < PER_VALUE_COUNT; ++j)
if (actual.num[j] != values[i].num[j])
{
printf ("error: mismatch at variable %d/%d: %d != %d\n",
i, j, actual.num[j], values[i].num[j]);
exit (1);
}
}
xpthread_barrier_wait (&barrier);
xpthread_join (blocked_thread);
/* Close the modules. */
for (int i = 0; i < COUNT; ++i)
dlclose (handles[i]);
return 0;
}
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