tests/thread-test.c - third_party/glib - Git at Google

 #undef G_DISABLE_ASSERT
 #undef G_LOG_DOMAIN

 #include <glib.h>

 /* GMutex */

 static GMutex test_g_mutex_mutex;
 static guint test_g_mutex_int = 0;
 static gboolean test_g_mutex_thread_ready;
 G_LOCK_DEFINE_STATIC (test_g_mutex);

 static gpointer
 test_g_mutex_thread (gpointer data)
 {
   g_assert (GPOINTER_TO_INT (data) == 42);
   g_assert (g_mutex_trylock (&test_g_mutex_mutex) == FALSE);
   g_assert (G_TRYLOCK (test_g_mutex) == FALSE);
   test_g_mutex_thread_ready = TRUE;
   g_mutex_lock (&test_g_mutex_mutex);
   g_assert (test_g_mutex_int == 42);
   g_mutex_unlock (&test_g_mutex_mutex);

   return GINT_TO_POINTER (41);
 }

 static void
 test_g_mutex (void)
 {
   GThread *thread;

   g_assert (g_mutex_trylock (&test_g_mutex_mutex));
   g_assert (G_TRYLOCK (test_g_mutex));
   test_g_mutex_thread_ready = FALSE;
   thread = g_thread_create (test_g_mutex_thread, GINT_TO_POINTER (42),
 			    TRUE, NULL);
   /* This busy wait is only for testing purposes and not an example of
    * good code!*/
   while (!test_g_mutex_thread_ready)
     g_usleep (G_USEC_PER_SEC / 5);
   test_g_mutex_int = 42;
   G_UNLOCK (test_g_mutex);
   g_mutex_unlock (&test_g_mutex_mutex);
   g_assert (GPOINTER_TO_INT (g_thread_join (thread)) == 41);
 }

 /* GStaticRecMutex */

 static GStaticRecMutex test_g_static_rec_mutex_mutex = G_STATIC_REC_MUTEX_INIT;
 static guint test_g_static_rec_mutex_int = 0;
 static gboolean test_g_static_rec_mutex_thread_ready;

 static gpointer
 test_g_static_rec_mutex_thread (gpointer data)
 {
   g_assert (GPOINTER_TO_INT (data) == 42);
   g_assert (g_static_rec_mutex_trylock (&test_g_static_rec_mutex_mutex)
 	    == FALSE);
   test_g_static_rec_mutex_thread_ready = TRUE;
   g_static_rec_mutex_lock (&test_g_static_rec_mutex_mutex);
   g_static_rec_mutex_lock (&test_g_static_rec_mutex_mutex);
   g_assert (test_g_static_rec_mutex_int == 42);
   test_g_static_rec_mutex_thread_ready = FALSE;
   g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);
   g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);

   g_thread_exit (GINT_TO_POINTER (43));

   g_assert_not_reached ();
   return NULL;
 }

 static void
 test_g_static_rec_mutex (void)
 {
   GThread *thread;

   g_assert (g_static_rec_mutex_trylock (&test_g_static_rec_mutex_mutex));
   test_g_static_rec_mutex_thread_ready = FALSE;
   thread = g_thread_create (test_g_static_rec_mutex_thread,
 			    GINT_TO_POINTER (42), TRUE, NULL);
   /* This busy wait is only for testing purposes and not an example of
    * good code!*/
   while (!test_g_static_rec_mutex_thread_ready)
     g_usleep (G_USEC_PER_SEC / 5);

   g_assert (g_static_rec_mutex_trylock (&test_g_static_rec_mutex_mutex));
   test_g_static_rec_mutex_int = 41;
   g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);
   test_g_static_rec_mutex_int = 42;
   g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);

   /* This busy wait is only for testing purposes and not an example of
    * good code!*/
   while (test_g_static_rec_mutex_thread_ready)
     g_usleep (G_USEC_PER_SEC / 5);

   g_static_rec_mutex_lock (&test_g_static_rec_mutex_mutex);
   test_g_static_rec_mutex_int = 0;
   g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);

   g_assert (GPOINTER_TO_INT (g_thread_join (thread)) == 43);
 }

 /* GStaticPrivate */

 #define THREADS 10

 static GStaticPrivate test_g_static_private_private1 = G_STATIC_PRIVATE_INIT;
 static GStaticPrivate test_g_static_private_private2 = G_STATIC_PRIVATE_INIT;
 static GMutex test_g_static_private_mutex;
 static guint test_g_static_private_counter = 0;
 static guint test_g_static_private_ready = 0;

 static gpointer
 test_g_static_private_constructor (void)
 {
   g_mutex_lock (&test_g_static_private_mutex);
   test_g_static_private_counter++;
   g_mutex_unlock (&test_g_static_private_mutex);
   return g_new (guint,1);
 }

 static void
 test_g_static_private_destructor (gpointer data)
 {
   g_mutex_lock (&test_g_static_private_mutex);
   test_g_static_private_counter--;
   g_mutex_unlock (&test_g_static_private_mutex);
   g_free (data);
 }


 static gpointer
 test_g_static_private_thread (gpointer data)
 {
   guint number = GPOINTER_TO_INT (data);
   guint i;
   guint *private1, *private2;
   for (i = 0; i < 10; i++)
     {
       number = number * 11 + 1; /* A very simple and bad RNG ;-) */
       private1 = g_static_private_get (&test_g_static_private_private1);
       if (!private1 || number % 7 > 3)
 	{
 	  private1 = test_g_static_private_constructor ();
 	  g_static_private_set (&test_g_static_private_private1, private1,
 				test_g_static_private_destructor);
 	}
       *private1 = number;
       private2 = g_static_private_get (&test_g_static_private_private2);
       if (!private2 || number % 13 > 5)
 	{
 	  private2 = test_g_static_private_constructor ();
 	  g_static_private_set (&test_g_static_private_private2, private2,
 				test_g_static_private_destructor);
 	}
       *private2 = number * 2;
       g_usleep (G_USEC_PER_SEC / 5);
       g_assert (number == *private1);
       g_assert (number * 2 == *private2);
     }
   g_mutex_lock (&test_g_static_private_mutex);
   test_g_static_private_ready++;
   g_mutex_unlock (&test_g_static_private_mutex);

   /* Busy wait is not nice but that's just a test */
   while (test_g_static_private_ready != 0)
     g_usleep (G_USEC_PER_SEC / 5);

   for (i = 0; i < 10; i++)
     {
       private2 = g_static_private_get (&test_g_static_private_private2);
       number = number * 11 + 1; /* A very simple and bad RNG ;-) */
       if (!private2 || number % 13 > 5)
 	{
 	  private2 = test_g_static_private_constructor ();
 	  g_static_private_set (&test_g_static_private_private2, private2,
 				test_g_static_private_destructor);
 	}
       *private2 = number * 2;
       g_usleep (G_USEC_PER_SEC / 5);
       g_assert (number * 2 == *private2);
     }

   return GINT_TO_POINTER (GPOINTER_TO_INT (data) * 3);
 }

 static void
 test_g_static_private (void)
 {
   GThread *threads[THREADS];
   guint i;

   test_g_static_private_ready = 0;

   for (i = 0; i < THREADS; i++)
     {
       threads[i] = g_thread_create (test_g_static_private_thread,
 				    GINT_TO_POINTER (i), TRUE, NULL);
     }

   /* Busy wait is not nice but that's just a test */
   while (test_g_static_private_ready != THREADS)
     g_usleep (G_USEC_PER_SEC / 5);

   /* Reuse the static private */
   g_static_private_free (&test_g_static_private_private2);
   g_static_private_init (&test_g_static_private_private2);

   test_g_static_private_ready = 0;

   for (i = 0; i < THREADS; i++)
     g_assert (GPOINTER_TO_INT (g_thread_join (threads[i])) == i * 3);

   g_assert (test_g_static_private_counter == 0);
 }

 /* GStaticRWLock */

 /* -1 = writing; >0 = # of readers */
 static gint test_g_static_rw_lock_state = 0;
 G_LOCK_DEFINE (test_g_static_rw_lock_state);

 static gboolean test_g_static_rw_lock_run = TRUE;
 static GStaticRWLock test_g_static_rw_lock_lock = G_STATIC_RW_LOCK_INIT;

 static gpointer
 test_g_static_rw_lock_thread (gpointer data)
 {
   while (test_g_static_rw_lock_run)
     {
       if (g_random_double() > .2) /* I'm a reader */
 	{

 	  if (g_random_double() > .2) /* I'll block */
 	    g_static_rw_lock_reader_lock (&test_g_static_rw_lock_lock);
 	  else /* I'll only try */
 	    if (!g_static_rw_lock_reader_trylock (&test_g_static_rw_lock_lock))
 	      continue;
 	  G_LOCK (test_g_static_rw_lock_state);
 	  g_assert (test_g_static_rw_lock_state >= 0);
 	  test_g_static_rw_lock_state++;
 	  G_UNLOCK (test_g_static_rw_lock_state);

 	  g_usleep (g_random_int_range (20,1000));

 	  G_LOCK (test_g_static_rw_lock_state);
 	  test_g_static_rw_lock_state--;
 	  G_UNLOCK (test_g_static_rw_lock_state);

 	  g_static_rw_lock_reader_unlock (&test_g_static_rw_lock_lock);
 	}
       else /* I'm a writer */
 	{

 	  if (g_random_double() > .2) /* I'll block */
 	    g_static_rw_lock_writer_lock (&test_g_static_rw_lock_lock);
 	  else /* I'll only try */
 	    if (!g_static_rw_lock_writer_trylock (&test_g_static_rw_lock_lock))
 	      continue;
 	  G_LOCK (test_g_static_rw_lock_state);
 	  g_assert (test_g_static_rw_lock_state == 0);
 	  test_g_static_rw_lock_state = -1;
 	  G_UNLOCK (test_g_static_rw_lock_state);

 	  g_usleep (g_random_int_range (20,1000));

 	  G_LOCK (test_g_static_rw_lock_state);
 	  test_g_static_rw_lock_state = 0;
 	  G_UNLOCK (test_g_static_rw_lock_state);

 	  g_static_rw_lock_writer_unlock (&test_g_static_rw_lock_lock);
 	}
     }
   return NULL;
 }

 static void
 test_g_static_rw_lock (void)
 {
   GThread *threads[THREADS];
   guint i;
   for (i = 0; i < THREADS; i++)
     {
       threads[i] = g_thread_create (test_g_static_rw_lock_thread,
 				    NULL, TRUE, NULL);
     }
   g_usleep (G_USEC_PER_SEC * 5);
   test_g_static_rw_lock_run = FALSE;
   for (i = 0; i < THREADS; i++)
     {
       g_thread_join (threads[i]);
     }
   g_assert (test_g_static_rw_lock_state == 0);
 }

 #define G_ONCE_SIZE 100
 #define G_ONCE_THREADS 10

 G_LOCK_DEFINE (test_g_once);
 static guint test_g_once_guint_array[G_ONCE_SIZE];
 static GOnce test_g_once_array[G_ONCE_SIZE];

 static gpointer
 test_g_once_init_func(gpointer arg)
 {
   guint *count = arg;
   g_usleep (g_random_int_range (20,1000));
   (*count)++;
   g_usleep (g_random_int_range (20,1000));
   return arg;
 }

 static gpointer
 test_g_once_thread (gpointer ignore)
 {
   guint i;
   G_LOCK (test_g_once);
   /* Don't start before all threads are created */
   G_UNLOCK (test_g_once);
   for (i = 0; i < 1000; i++)
     {
       guint pos = g_random_int_range (0, G_ONCE_SIZE);
       gpointer ret = g_once (test_g_once_array + pos, test_g_once_init_func,
 			     test_g_once_guint_array + pos);
       g_assert (ret == test_g_once_guint_array + pos);
     }

   /* Make sure, that all counters are touched at least once */
   for (i = 0; i < G_ONCE_SIZE; i++)
     {
       gpointer ret = g_once (test_g_once_array + i, test_g_once_init_func,
 			     test_g_once_guint_array + i);
       g_assert (ret == test_g_once_guint_array + i);
     }

   return NULL;
 }

 static void
 test_g_thread_once (void)
 {
   static GOnce once_init = G_ONCE_INIT;
   GThread *threads[G_ONCE_THREADS];
   guint i;
   for (i = 0; i < G_ONCE_SIZE; i++)
     {
       test_g_once_array[i] = once_init;
       test_g_once_guint_array[i] = i;
     }
   G_LOCK (test_g_once);
   for (i = 0; i < G_ONCE_THREADS; i++)
     {
       threads[i] = g_thread_create (test_g_once_thread, GUINT_TO_POINTER(i%2),
 				    TRUE, NULL);
     }
   G_UNLOCK (test_g_once);
   for (i = 0; i < G_ONCE_THREADS; i++)
     {
       g_thread_join (threads[i]);
     }

   for (i = 0; i < G_ONCE_SIZE; i++)
     {
       g_assert (test_g_once_guint_array[i] == i + 1);
     }
 }

 /* run all the tests */
 static void
 run_all_tests (void)
 {
   test_g_mutex ();
   test_g_static_rec_mutex ();
   test_g_static_private ();
   test_g_static_rw_lock ();
   test_g_thread_once ();
 }

 int
 main (int   argc,
       char *argv[])
 {
   run_all_tests ();

   /* Now we rerun all tests, but this time we fool the system into
    * thinking, that the available thread system is not native, but
    * userprovided. */

   g_thread_use_default_impl = FALSE;
   run_all_tests ();

   /* XXX: And this shows how silly the above non-native tests are */
   g_static_rw_lock_free (&test_g_static_rw_lock_lock);
   g_static_rec_mutex_free (&test_g_static_rec_mutex_mutex);
   g_static_private_free (&test_g_static_private_private2);

   return 0;
 }
	#undef G_DISABLE_ASSERT
	#undef G_LOG_DOMAIN

	#include <glib.h>

	/* GMutex */

	static GMutex test_g_mutex_mutex;
	static guint test_g_mutex_int = 0;
	static gboolean test_g_mutex_thread_ready;
	G_LOCK_DEFINE_STATIC (test_g_mutex);

	static gpointer
	test_g_mutex_thread (gpointer data)
	{
	g_assert (GPOINTER_TO_INT (data) == 42);
	g_assert (g_mutex_trylock (&test_g_mutex_mutex) == FALSE);
	g_assert (G_TRYLOCK (test_g_mutex) == FALSE);
	test_g_mutex_thread_ready = TRUE;
	g_mutex_lock (&test_g_mutex_mutex);
	g_assert (test_g_mutex_int == 42);
	g_mutex_unlock (&test_g_mutex_mutex);

	return GINT_TO_POINTER (41);
	}

	static void
	test_g_mutex (void)
	{
	GThread *thread;

	g_assert (g_mutex_trylock (&test_g_mutex_mutex));
	g_assert (G_TRYLOCK (test_g_mutex));
	test_g_mutex_thread_ready = FALSE;
	thread = g_thread_create (test_g_mutex_thread, GINT_TO_POINTER (42),
	TRUE, NULL);
	/* This busy wait is only for testing purposes and not an example of
	* good code!*/
	while (!test_g_mutex_thread_ready)
	g_usleep (G_USEC_PER_SEC / 5);
	test_g_mutex_int = 42;
	G_UNLOCK (test_g_mutex);
	g_mutex_unlock (&test_g_mutex_mutex);
	g_assert (GPOINTER_TO_INT (g_thread_join (thread)) == 41);
	}

	/* GStaticRecMutex */

	static GStaticRecMutex test_g_static_rec_mutex_mutex = G_STATIC_REC_MUTEX_INIT;
	static guint test_g_static_rec_mutex_int = 0;
	static gboolean test_g_static_rec_mutex_thread_ready;

	static gpointer
	test_g_static_rec_mutex_thread (gpointer data)
	{
	g_assert (GPOINTER_TO_INT (data) == 42);
	g_assert (g_static_rec_mutex_trylock (&test_g_static_rec_mutex_mutex)
	== FALSE);
	test_g_static_rec_mutex_thread_ready = TRUE;
	g_static_rec_mutex_lock (&test_g_static_rec_mutex_mutex);
	g_static_rec_mutex_lock (&test_g_static_rec_mutex_mutex);
	g_assert (test_g_static_rec_mutex_int == 42);
	test_g_static_rec_mutex_thread_ready = FALSE;
	g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);
	g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);

	g_thread_exit (GINT_TO_POINTER (43));

	g_assert_not_reached ();
	return NULL;
	}

	static void
	test_g_static_rec_mutex (void)
	{
	GThread *thread;

	g_assert (g_static_rec_mutex_trylock (&test_g_static_rec_mutex_mutex));
	test_g_static_rec_mutex_thread_ready = FALSE;
	thread = g_thread_create (test_g_static_rec_mutex_thread,
	GINT_TO_POINTER (42), TRUE, NULL);
	/* This busy wait is only for testing purposes and not an example of
	* good code!*/
	while (!test_g_static_rec_mutex_thread_ready)
	g_usleep (G_USEC_PER_SEC / 5);

	g_assert (g_static_rec_mutex_trylock (&test_g_static_rec_mutex_mutex));
	test_g_static_rec_mutex_int = 41;
	g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);
	test_g_static_rec_mutex_int = 42;
	g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);

	/* This busy wait is only for testing purposes and not an example of
	* good code!*/
	while (test_g_static_rec_mutex_thread_ready)
	g_usleep (G_USEC_PER_SEC / 5);

	g_static_rec_mutex_lock (&test_g_static_rec_mutex_mutex);
	test_g_static_rec_mutex_int = 0;
	g_static_rec_mutex_unlock (&test_g_static_rec_mutex_mutex);

	g_assert (GPOINTER_TO_INT (g_thread_join (thread)) == 43);
	}

	/* GStaticPrivate */

	#define THREADS 10

	static GStaticPrivate test_g_static_private_private1 = G_STATIC_PRIVATE_INIT;
	static GStaticPrivate test_g_static_private_private2 = G_STATIC_PRIVATE_INIT;
	static GMutex test_g_static_private_mutex;
	static guint test_g_static_private_counter = 0;
	static guint test_g_static_private_ready = 0;

	static gpointer
	test_g_static_private_constructor (void)
	{
	g_mutex_lock (&test_g_static_private_mutex);
	test_g_static_private_counter++;
	g_mutex_unlock (&test_g_static_private_mutex);
	return g_new (guint,1);
	}

	static void
	test_g_static_private_destructor (gpointer data)
	{
	g_mutex_lock (&test_g_static_private_mutex);
	test_g_static_private_counter--;
	g_mutex_unlock (&test_g_static_private_mutex);
	g_free (data);
	}


	static gpointer
	test_g_static_private_thread (gpointer data)
	{
	guint number = GPOINTER_TO_INT (data);
	guint i;
	guint private1, private2;
	for (i = 0; i < 10; i++)
	{
	number = number * 11 + 1; /* A very simple and bad RNG ;-) */
	private1 = g_static_private_get (&test_g_static_private_private1);
	if (!private1 \|\| number % 7 > 3)
	{
	private1 = test_g_static_private_constructor ();
	g_static_private_set (&test_g_static_private_private1, private1,
	test_g_static_private_destructor);
	}
	*private1 = number;
	private2 = g_static_private_get (&test_g_static_private_private2);
	if (!private2 \|\| number % 13 > 5)
	{
	private2 = test_g_static_private_constructor ();
	g_static_private_set (&test_g_static_private_private2, private2,
	test_g_static_private_destructor);
	}
	private2 = number 2;
	g_usleep (G_USEC_PER_SEC / 5);
	g_assert (number == *private1);
	g_assert (number * 2 == *private2);
	}
	g_mutex_lock (&test_g_static_private_mutex);
	test_g_static_private_ready++;
	g_mutex_unlock (&test_g_static_private_mutex);

	/* Busy wait is not nice but that's just a test */
	while (test_g_static_private_ready != 0)
	g_usleep (G_USEC_PER_SEC / 5);

	for (i = 0; i < 10; i++)
	{
	private2 = g_static_private_get (&test_g_static_private_private2);
	number = number * 11 + 1; /* A very simple and bad RNG ;-) */
	if (!private2 \|\| number % 13 > 5)
	{
	private2 = test_g_static_private_constructor ();
	g_static_private_set (&test_g_static_private_private2, private2,
	test_g_static_private_destructor);
	}
	private2 = number 2;
	g_usleep (G_USEC_PER_SEC / 5);
	g_assert (number * 2 == *private2);
	}

	return GINT_TO_POINTER (GPOINTER_TO_INT (data) * 3);
	}

	static void
	test_g_static_private (void)
	{
	GThread *threads[THREADS];
	guint i;

	test_g_static_private_ready = 0;

	for (i = 0; i < THREADS; i++)
	{
	threads[i] = g_thread_create (test_g_static_private_thread,
	GINT_TO_POINTER (i), TRUE, NULL);
	}

	/* Busy wait is not nice but that's just a test */
	while (test_g_static_private_ready != THREADS)
	g_usleep (G_USEC_PER_SEC / 5);

	/* Reuse the static private */
	g_static_private_free (&test_g_static_private_private2);
	g_static_private_init (&test_g_static_private_private2);

	test_g_static_private_ready = 0;

	for (i = 0; i < THREADS; i++)
	g_assert (GPOINTER_TO_INT (g_thread_join (threads[i])) == i * 3);

	g_assert (test_g_static_private_counter == 0);
	}

	/* GStaticRWLock */

	/* -1 = writing; >0 = # of readers */
	static gint test_g_static_rw_lock_state = 0;
	G_LOCK_DEFINE (test_g_static_rw_lock_state);

	static gboolean test_g_static_rw_lock_run = TRUE;
	static GStaticRWLock test_g_static_rw_lock_lock = G_STATIC_RW_LOCK_INIT;

	static gpointer
	test_g_static_rw_lock_thread (gpointer data)
	{
	while (test_g_static_rw_lock_run)
	{
	if (g_random_double() > .2) /* I'm a reader */
	{

	if (g_random_double() > .2) /* I'll block */
	g_static_rw_lock_reader_lock (&test_g_static_rw_lock_lock);
	else /* I'll only try */
	if (!g_static_rw_lock_reader_trylock (&test_g_static_rw_lock_lock))
	continue;
	G_LOCK (test_g_static_rw_lock_state);
	g_assert (test_g_static_rw_lock_state >= 0);
	test_g_static_rw_lock_state++;
	G_UNLOCK (test_g_static_rw_lock_state);

	g_usleep (g_random_int_range (20,1000));

	G_LOCK (test_g_static_rw_lock_state);
	test_g_static_rw_lock_state--;
	G_UNLOCK (test_g_static_rw_lock_state);

	g_static_rw_lock_reader_unlock (&test_g_static_rw_lock_lock);
	}
	else /* I'm a writer */
	{

	if (g_random_double() > .2) /* I'll block */
	g_static_rw_lock_writer_lock (&test_g_static_rw_lock_lock);
	else /* I'll only try */
	if (!g_static_rw_lock_writer_trylock (&test_g_static_rw_lock_lock))
	continue;
	G_LOCK (test_g_static_rw_lock_state);
	g_assert (test_g_static_rw_lock_state == 0);
	test_g_static_rw_lock_state = -1;
	G_UNLOCK (test_g_static_rw_lock_state);

	g_usleep (g_random_int_range (20,1000));

	G_LOCK (test_g_static_rw_lock_state);
	test_g_static_rw_lock_state = 0;
	G_UNLOCK (test_g_static_rw_lock_state);

	g_static_rw_lock_writer_unlock (&test_g_static_rw_lock_lock);
	}
	}
	return NULL;
	}

	static void
	test_g_static_rw_lock (void)
	{
	GThread *threads[THREADS];
	guint i;
	for (i = 0; i < THREADS; i++)
	{
	threads[i] = g_thread_create (test_g_static_rw_lock_thread,
	NULL, TRUE, NULL);
	}
	g_usleep (G_USEC_PER_SEC * 5);
	test_g_static_rw_lock_run = FALSE;
	for (i = 0; i < THREADS; i++)
	{
	g_thread_join (threads[i]);
	}
	g_assert (test_g_static_rw_lock_state == 0);
	}

	#define G_ONCE_SIZE 100
	#define G_ONCE_THREADS 10

	G_LOCK_DEFINE (test_g_once);
	static guint test_g_once_guint_array[G_ONCE_SIZE];
	static GOnce test_g_once_array[G_ONCE_SIZE];

	static gpointer
	test_g_once_init_func(gpointer arg)
	{
	guint *count = arg;
	g_usleep (g_random_int_range (20,1000));
	(*count)++;
	g_usleep (g_random_int_range (20,1000));
	return arg;
	}

	static gpointer
	test_g_once_thread (gpointer ignore)
	{
	guint i;
	G_LOCK (test_g_once);
	/* Don't start before all threads are created */
	G_UNLOCK (test_g_once);
	for (i = 0; i < 1000; i++)
	{
	guint pos = g_random_int_range (0, G_ONCE_SIZE);
	gpointer ret = g_once (test_g_once_array + pos, test_g_once_init_func,
	test_g_once_guint_array + pos);
	g_assert (ret == test_g_once_guint_array + pos);
	}

	/* Make sure, that all counters are touched at least once */
	for (i = 0; i < G_ONCE_SIZE; i++)
	{
	gpointer ret = g_once (test_g_once_array + i, test_g_once_init_func,
	test_g_once_guint_array + i);
	g_assert (ret == test_g_once_guint_array + i);
	}

	return NULL;
	}

	static void
	test_g_thread_once (void)
	{
	static GOnce once_init = G_ONCE_INIT;
	GThread *threads[G_ONCE_THREADS];
	guint i;
	for (i = 0; i < G_ONCE_SIZE; i++)
	{
	test_g_once_array[i] = once_init;
	test_g_once_guint_array[i] = i;
	}
	G_LOCK (test_g_once);
	for (i = 0; i < G_ONCE_THREADS; i++)
	{
	threads[i] = g_thread_create (test_g_once_thread, GUINT_TO_POINTER(i%2),
	TRUE, NULL);
	}
	G_UNLOCK (test_g_once);
	for (i = 0; i < G_ONCE_THREADS; i++)
	{
	g_thread_join (threads[i]);
	}

	for (i = 0; i < G_ONCE_SIZE; i++)
	{
	g_assert (test_g_once_guint_array[i] == i + 1);
	}
	}

	/* run all the tests */
	static void
	run_all_tests (void)
	{
	test_g_mutex ();
	test_g_static_rec_mutex ();
	test_g_static_private ();
	test_g_static_rw_lock ();
	test_g_thread_once ();
	}

	int
	main (int argc,
	char *argv[])
	{
	run_all_tests ();

	/* Now we rerun all tests, but this time we fool the system into
	* thinking, that the available thread system is not native, but
	* userprovided. */

	g_thread_use_default_impl = FALSE;
	run_all_tests ();

	/* XXX: And this shows how silly the above non-native tests are */
	g_static_rw_lock_free (&test_g_static_rw_lock_lock);
	g_static_rec_mutex_free (&test_g_static_rec_mutex_mutex);
	g_static_private_free (&test_g_static_private_private2);

	return 0;
	}