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/* g_once_init_*() test
* Copyright (C) 2007 Tim Janik
*
* This work is provided "as is"; redistribution and modification
* in whole or in part, in any medium, physical or electronic is
* permitted without restriction.
* This work 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.
* In no event shall the authors or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even
* if advised of the possibility of such damage.
*/
#include <glib.h>
#include <stdlib.h>
#define N_THREADS (13)
static GMutex *tmutex = NULL;
static GCond *tcond = NULL;
static volatile int thread_call_count = 0;
static char dummy_value = 'x';
static void
assert_singleton_execution1 (void)
{
static volatile int seen_execution = 0;
int old_seen_execution = g_atomic_int_add (&seen_execution, 1);
if (old_seen_execution != 0)
g_error ("%s: function executed more than once", G_STRFUNC);
}
static void
assert_singleton_execution2 (void)
{
static volatile int seen_execution = 0;
int old_seen_execution = g_atomic_int_add (&seen_execution, 1);
if (old_seen_execution != 0)
g_error ("%s: function executed more than once", G_STRFUNC);
}
static void
assert_singleton_execution3 (void)
{
static volatile int seen_execution = 0;
int old_seen_execution = g_atomic_int_add (&seen_execution, 1);
if (old_seen_execution != 0)
g_error ("%s: function executed more than once", G_STRFUNC);
}
static void
initializer1 (void)
{
static volatile gsize initialized = 0;
if (g_once_init_enter (&initialized))
{
gsize initval = 42;
assert_singleton_execution1();
g_once_init_leave (&initialized, initval);
}
}
static gpointer
initializer2 (void)
{
static volatile gsize initialized = 0;
if (g_once_init_enter (&initialized))
{
void *pointer_value = &dummy_value;
assert_singleton_execution2();
g_once_init_leave (&initialized, (gsize) pointer_value);
}
return (void*) initialized;
}
static void
initializer3 (void)
{
static volatile gsize initialized = 0;
if (g_once_init_enter (&initialized))
{
gsize initval = 42;
assert_singleton_execution3();
g_usleep (25 * 1000); /* waste time for multiple threads to wait */
g_once_init_leave (&initialized, initval);
}
}
static gpointer
tmain_call_initializer3 (gpointer user_data)
{
g_mutex_lock (tmutex);
g_cond_wait (tcond, tmutex);
g_mutex_unlock (tmutex);
//g_printf ("[");
initializer3();
//g_printf ("]\n");
g_atomic_int_add (&thread_call_count, 1);
return NULL;
}
static void* stress_concurrent_initializers (void*);
int
main (int argc,
char *argv[])
{
GThread *threads[N_THREADS];
int i;
/* test simple initializer */
initializer1();
initializer1();
/* test pointer initializer */
void *p = initializer2();
g_assert (p == &dummy_value);
p = initializer2();
g_assert (p == &dummy_value);
/* setup threads */
g_thread_init (NULL);
tmutex = g_mutex_new ();
tcond = g_cond_new ();
/* start multiple threads for initializer3() */
g_mutex_lock (tmutex);
for (i = 0; i < N_THREADS; i++)
threads[i] = g_thread_create (tmain_call_initializer3, 0, FALSE, NULL);
g_mutex_unlock (tmutex);
/* concurrently call initializer3() */
g_cond_broadcast (tcond);
/* loop until all threads passed the call to initializer3() */
while (g_atomic_int_get (&thread_call_count) < i)
{
if (rand() % 2)
g_thread_yield(); /* concurrent shuffling for single core */
else
g_usleep (1000); /* concurrent shuffling for multi core */
g_cond_broadcast (tcond);
}
/* call multiple (unoptimized) initializers from multiple threads */
g_mutex_lock (tmutex);
g_atomic_int_set (&thread_call_count, 0);
for (i = 0; i < N_THREADS; i++)
g_thread_create (stress_concurrent_initializers, 0, FALSE, NULL);
g_mutex_unlock (tmutex);
while (g_atomic_int_get (&thread_call_count) < 256 * 4 * N_THREADS)
g_usleep (50 * 1000); /* wait for all 5 threads to complete */
return 0;
}
/* get rid of g_once_init_enter-optimizations in the below definitions
* to uncover possible races in the g_once_init_enter_impl()/
* g_once_init_leave() implementations
*/
#define g_once_init_enter g_once_init_enter_impl
/* define 16 * 16 simple initializers */
#define DEFINE_TEST_INITIALIZER(N) \
static void \
test_initializer_##N (void) \
{ \
static volatile gsize initialized = 0; \
if (g_once_init_enter (&initialized)) \
{ \
g_free (g_strdup_printf ("cpuhog%5d", 1)); \
g_free (g_strdup_printf ("cpuhog%6d", 2)); \
g_free (g_strdup_printf ("cpuhog%7d", 3)); \
g_once_init_leave (&initialized, 1); \
} \
}
#define DEFINE_16_TEST_INITIALIZERS(P) \
DEFINE_TEST_INITIALIZER (P##0) \
DEFINE_TEST_INITIALIZER (P##1) \
DEFINE_TEST_INITIALIZER (P##2) \
DEFINE_TEST_INITIALIZER (P##3) \
DEFINE_TEST_INITIALIZER (P##4) \
DEFINE_TEST_INITIALIZER (P##5) \
DEFINE_TEST_INITIALIZER (P##6) \
DEFINE_TEST_INITIALIZER (P##7) \
DEFINE_TEST_INITIALIZER (P##8) \
DEFINE_TEST_INITIALIZER (P##9) \
DEFINE_TEST_INITIALIZER (P##a) \
DEFINE_TEST_INITIALIZER (P##b) \
DEFINE_TEST_INITIALIZER (P##c) \
DEFINE_TEST_INITIALIZER (P##d) \
DEFINE_TEST_INITIALIZER (P##e) \
DEFINE_TEST_INITIALIZER (P##f)
#define DEFINE_256_TEST_INITIALIZERS(P) \
DEFINE_16_TEST_INITIALIZERS (P##_0) \
DEFINE_16_TEST_INITIALIZERS (P##_1) \
DEFINE_16_TEST_INITIALIZERS (P##_2) \
DEFINE_16_TEST_INITIALIZERS (P##_3) \
DEFINE_16_TEST_INITIALIZERS (P##_4) \
DEFINE_16_TEST_INITIALIZERS (P##_5) \
DEFINE_16_TEST_INITIALIZERS (P##_6) \
DEFINE_16_TEST_INITIALIZERS (P##_7) \
DEFINE_16_TEST_INITIALIZERS (P##_8) \
DEFINE_16_TEST_INITIALIZERS (P##_9) \
DEFINE_16_TEST_INITIALIZERS (P##_a) \
DEFINE_16_TEST_INITIALIZERS (P##_b) \
DEFINE_16_TEST_INITIALIZERS (P##_c) \
DEFINE_16_TEST_INITIALIZERS (P##_d) \
DEFINE_16_TEST_INITIALIZERS (P##_e) \
DEFINE_16_TEST_INITIALIZERS (P##_f)
/* list 16 * 16 simple initializers */
#define LIST_16_TEST_INITIALIZERS(P) \
test_initializer_##P##0, \
test_initializer_##P##1, \
test_initializer_##P##2, \
test_initializer_##P##3, \
test_initializer_##P##4, \
test_initializer_##P##5, \
test_initializer_##P##6, \
test_initializer_##P##7, \
test_initializer_##P##8, \
test_initializer_##P##9, \
test_initializer_##P##a, \
test_initializer_##P##b, \
test_initializer_##P##c, \
test_initializer_##P##d, \
test_initializer_##P##e, \
test_initializer_##P##f
#define LIST_256_TEST_INITIALIZERS(P) \
LIST_16_TEST_INITIALIZERS (P##_0), \
LIST_16_TEST_INITIALIZERS (P##_1), \
LIST_16_TEST_INITIALIZERS (P##_2), \
LIST_16_TEST_INITIALIZERS (P##_3), \
LIST_16_TEST_INITIALIZERS (P##_4), \
LIST_16_TEST_INITIALIZERS (P##_5), \
LIST_16_TEST_INITIALIZERS (P##_6), \
LIST_16_TEST_INITIALIZERS (P##_7), \
LIST_16_TEST_INITIALIZERS (P##_8), \
LIST_16_TEST_INITIALIZERS (P##_9), \
LIST_16_TEST_INITIALIZERS (P##_a), \
LIST_16_TEST_INITIALIZERS (P##_b), \
LIST_16_TEST_INITIALIZERS (P##_c), \
LIST_16_TEST_INITIALIZERS (P##_d), \
LIST_16_TEST_INITIALIZERS (P##_e), \
LIST_16_TEST_INITIALIZERS (P##_f)
/* define 4 * 256 initializers */
DEFINE_256_TEST_INITIALIZERS (stress1);
DEFINE_256_TEST_INITIALIZERS (stress2);
DEFINE_256_TEST_INITIALIZERS (stress3);
DEFINE_256_TEST_INITIALIZERS (stress4);
/* call the above 1024 initializers */
static void*
stress_concurrent_initializers (void *user_data)
{
static void (*initializers[]) (void) = {
LIST_256_TEST_INITIALIZERS (stress1),
LIST_256_TEST_INITIALIZERS (stress2),
LIST_256_TEST_INITIALIZERS (stress3),
LIST_256_TEST_INITIALIZERS (stress4),
};
int i;
/* sync to main thread */
g_mutex_lock (tmutex);
g_mutex_unlock (tmutex);
/* initialize concurrently */
for (i = 0; i < G_N_ELEMENTS (initializers); i++)
{
initializers[i]();
g_atomic_int_add (&thread_call_count, 1);
}
return NULL;
}
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