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/* Test of thread-local storage in multithreaded situations.
Copyright (C) 2005, 2008-2014 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
#include <config.h>
#if USE_POSIX_THREADS || USE_SOLARIS_THREADS || USE_PTH_THREADS || USE_WINDOWS_THREADS
#if USE_POSIX_THREADS
# define TEST_POSIX_THREADS 1
#endif
#if USE_SOLARIS_THREADS
# define TEST_SOLARIS_THREADS 1
#endif
#if USE_PTH_THREADS
# define TEST_PTH_THREADS 1
#endif
#if USE_WINDOWS_THREADS
# define TEST_WINDOWS_THREADS 1
#endif
/* Whether to help the scheduler through explicit yield().
Uncomment this to see if the operating system has a fair scheduler. */
#define EXPLICIT_YIELD 1
/* Whether to print debugging messages. */
#define ENABLE_DEBUGGING 0
/* Number of simultaneous threads. */
#define THREAD_COUNT 16
/* Number of operations performed in each thread. */
#define REPEAT_COUNT 50000
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "glthread/tls.h"
#include "glthread/thread.h"
#include "glthread/yield.h"
#if ENABLE_DEBUGGING
# define dbgprintf printf
#else
# define dbgprintf if (0) printf
#endif
#if EXPLICIT_YIELD
# define yield() gl_thread_yield ()
#else
# define yield()
#endif
static void
perhaps_yield (void)
{
/* Call yield () only with a certain probability, otherwise with GNU Pth
the sequence of thread activations is too predictable. */
if ((((unsigned int) rand () >> 3) % 4) == 0)
yield ();
}
/* ----------------------- Test thread-local storage ----------------------- */
#define KEYS_COUNT 4
static gl_tls_key_t mykeys[KEYS_COUNT];
static void *
worker_thread (void *arg)
{
unsigned int id = (unsigned int) (unsigned long) arg;
int i, j, repeat;
unsigned int values[KEYS_COUNT];
dbgprintf ("Worker %p started\n", gl_thread_self_pointer ());
/* Initialize the per-thread storage. */
for (i = 0; i < KEYS_COUNT; i++)
{
values[i] = (((unsigned int) rand () >> 3) % 1000000) * THREAD_COUNT + id;
/* Hopefully no arithmetic overflow. */
if ((values[i] % THREAD_COUNT) != id)
abort ();
}
perhaps_yield ();
/* Verify that the initial value is NULL. */
dbgprintf ("Worker %p before initial verify\n", gl_thread_self_pointer ());
for (i = 0; i < KEYS_COUNT; i++)
if (gl_tls_get (mykeys[i]) != NULL)
abort ();
dbgprintf ("Worker %p after initial verify\n", gl_thread_self_pointer ());
perhaps_yield ();
/* Initialize the per-thread storage. */
dbgprintf ("Worker %p before first tls_set\n", gl_thread_self_pointer ());
for (i = 0; i < KEYS_COUNT; i++)
{
unsigned int *ptr = (unsigned int *) malloc (sizeof (unsigned int));
*ptr = values[i];
gl_tls_set (mykeys[i], ptr);
}
dbgprintf ("Worker %p after first tls_set\n", gl_thread_self_pointer ());
perhaps_yield ();
/* Shuffle around the pointers. */
for (repeat = REPEAT_COUNT; repeat > 0; repeat--)
{
dbgprintf ("Worker %p doing value swapping\n", gl_thread_self_pointer ());
i = ((unsigned int) rand () >> 3) % KEYS_COUNT;
j = ((unsigned int) rand () >> 3) % KEYS_COUNT;
if (i != j)
{
void *vi = gl_tls_get (mykeys[i]);
void *vj = gl_tls_get (mykeys[j]);
gl_tls_set (mykeys[i], vj);
gl_tls_set (mykeys[j], vi);
}
perhaps_yield ();
}
/* Verify that all the values are from this thread. */
dbgprintf ("Worker %p before final verify\n", gl_thread_self_pointer ());
for (i = 0; i < KEYS_COUNT; i++)
if ((*(unsigned int *) gl_tls_get (mykeys[i]) % THREAD_COUNT) != id)
abort ();
dbgprintf ("Worker %p after final verify\n", gl_thread_self_pointer ());
perhaps_yield ();
dbgprintf ("Worker %p dying.\n", gl_thread_self_pointer ());
return NULL;
}
static void
test_tls (void)
{
int pass, i;
for (pass = 0; pass < 2; pass++)
{
gl_thread_t threads[THREAD_COUNT];
if (pass == 0)
for (i = 0; i < KEYS_COUNT; i++)
gl_tls_key_init (mykeys[i], free);
else
for (i = KEYS_COUNT - 1; i >= 0; i--)
gl_tls_key_init (mykeys[i], free);
/* Spawn the threads. */
for (i = 0; i < THREAD_COUNT; i++)
threads[i] = gl_thread_create (worker_thread, NULL);
/* Wait for the threads to terminate. */
for (i = 0; i < THREAD_COUNT; i++)
gl_thread_join (threads[i], NULL);
for (i = 0; i < KEYS_COUNT; i++)
gl_tls_key_destroy (mykeys[i]);
}
}
/* -------------------------------------------------------------------------- */
int
main ()
{
#if TEST_PTH_THREADS
if (!pth_init ())
abort ();
#endif
printf ("Starting test_tls ..."); fflush (stdout);
test_tls ();
printf (" OK\n"); fflush (stdout);
return 0;
}
#else
/* No multithreading available. */
#include <stdio.h>
int
main ()
{
fputs ("Skipping test: multithreading not enabled\n", stderr);
return 77;
}
#endif
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