File: threadpool-test.c

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#undef G_DISABLE_ASSERT
#undef G_LOG_DOMAIN

#include "config.h"

#include <glib.h>

/* #define DEBUG 1 */

#ifdef DEBUG
# define DEBUG_MSG(args) g_printerr args ; g_printerr ("\n");
#else
# define DEBUG_MSG(x)
#endif

#define WAIT                5    /* seconds */
#define MAX_THREADS         10

/* if > 0 the test will run continuously (since the test ends when
 * thread count is 0), if -1 it means no limit to unused threads
 * if 0 then no unused threads are possible */
#define MAX_UNUSED_THREADS -1

G_LOCK_DEFINE_STATIC (thread_counter_pools);

static gulong abs_thread_counter = 0;
static gulong running_thread_counter = 0;
static gulong leftover_task_counter = 0;

G_LOCK_DEFINE_STATIC (last_thread);

static guint last_thread_id = 0;

G_LOCK_DEFINE_STATIC (thread_counter_sort);

static gulong sort_thread_counter = 0;

static GThreadPool *idle_pool = NULL;

static GMainLoop *main_loop = NULL;

static void
test_thread_functions (void)
{
  gint max_unused_threads;
  guint max_idle_time;

  /* This function attempts to call functions which don't need a
   * threadpool to operate to make sure no uninitialised pointers
   * accessed and no errors occur.
   */

  max_unused_threads = 3;

  DEBUG_MSG (("[funcs] Setting max unused threads to %d",
	      max_unused_threads));
  g_thread_pool_set_max_unused_threads (max_unused_threads);

  DEBUG_MSG (("[funcs] Getting max unused threads = %d",
	     g_thread_pool_get_max_unused_threads ()));
  g_assert (g_thread_pool_get_max_unused_threads() == max_unused_threads);

  DEBUG_MSG (("[funcs] Getting num unused threads = %d",
	     g_thread_pool_get_num_unused_threads ()));
  g_assert (g_thread_pool_get_num_unused_threads () == 0);

  DEBUG_MSG (("[funcs] Stopping unused threads"));
  g_thread_pool_stop_unused_threads ();

  max_idle_time = 10 * G_USEC_PER_SEC;

  DEBUG_MSG (("[funcs] Setting max idle time to %d",
	      max_idle_time));
  g_thread_pool_set_max_idle_time (max_idle_time);

  DEBUG_MSG (("[funcs] Getting max idle time = %d",
	     g_thread_pool_get_max_idle_time ()));
  g_assert (g_thread_pool_get_max_idle_time () == max_idle_time);

  DEBUG_MSG (("[funcs] Setting max idle time to 0"));
  g_thread_pool_set_max_idle_time (0);

  DEBUG_MSG (("[funcs] Getting max idle time = %d",
	     g_thread_pool_get_max_idle_time ()));
  g_assert (g_thread_pool_get_max_idle_time () == 0);
}

static void
test_thread_stop_unused (void)
{
   GThreadPool *pool;
   guint i;
   guint limit = 100;

   /* Spawn a few threads. */
   g_thread_pool_set_max_unused_threads (-1);
   pool = g_thread_pool_new ((GFunc) g_usleep, NULL, -1, FALSE, NULL);

   for (i = 0; i < limit; i++)
     g_thread_pool_push (pool, GUINT_TO_POINTER (1000), NULL);

   DEBUG_MSG (("[unused] ===> pushed %d threads onto the idle pool",
	       limit));

   /* Wait for the threads to migrate. */
   g_usleep (G_USEC_PER_SEC);

   DEBUG_MSG (("[unused] stopping unused threads"));
   g_thread_pool_stop_unused_threads ();

   for (i = 0; i < 5; i++)
     {
       if (g_thread_pool_get_num_unused_threads () == 0)
         break;

       DEBUG_MSG (("[unused] waiting ONE second for threads to die"));

       /* Some time for threads to die. */
       g_usleep (G_USEC_PER_SEC);
     }

   DEBUG_MSG (("[unused] stopped idle threads, %d remain",
	       g_thread_pool_get_num_unused_threads ()));

   g_assert (g_thread_pool_get_num_unused_threads () == 0);

   g_thread_pool_set_max_unused_threads (MAX_THREADS);

   DEBUG_MSG (("[unused] cleaning up thread pool"));
   g_thread_pool_free (pool, FALSE, TRUE);
}

static void
test_thread_pools_entry_func (gpointer data, gpointer user_data)
{
#ifdef DEBUG
  guint id = 0;

  id = GPOINTER_TO_UINT (data);
#endif

  DEBUG_MSG (("[pool] ---> [%3.3d] entered thread.", id));

  G_LOCK (thread_counter_pools);
  abs_thread_counter++;
  running_thread_counter++;
  G_UNLOCK (thread_counter_pools);

  g_usleep (g_random_int_range (0, 4000));

  G_LOCK (thread_counter_pools);
  running_thread_counter--;
  leftover_task_counter--;

  DEBUG_MSG (("[pool] ---> [%3.3d] exiting thread (abs count:%ld, "
	      "running count:%ld, left over:%ld)",
	      id, abs_thread_counter,
	      running_thread_counter, leftover_task_counter));
  G_UNLOCK (thread_counter_pools);
}

static void
test_thread_pools (void)
{
  GThreadPool *pool1, *pool2, *pool3;
  guint runs;
  guint i;

  pool1 = g_thread_pool_new ((GFunc)test_thread_pools_entry_func, NULL, 3, FALSE, NULL);
  pool2 = g_thread_pool_new ((GFunc)test_thread_pools_entry_func, NULL, 5, TRUE, NULL);
  pool3 = g_thread_pool_new ((GFunc)test_thread_pools_entry_func, NULL, 7, TRUE, NULL);

  runs = 300;
  for (i = 0; i < runs; i++)
    {
      g_thread_pool_push (pool1, GUINT_TO_POINTER (i + 1), NULL);
      g_thread_pool_push (pool2, GUINT_TO_POINTER (i + 1), NULL);
      g_thread_pool_push (pool3, GUINT_TO_POINTER (i + 1), NULL);

      G_LOCK (thread_counter_pools);
      leftover_task_counter += 3;
      G_UNLOCK (thread_counter_pools);
    }

  g_thread_pool_free (pool1, TRUE, TRUE);
  g_thread_pool_free (pool2, FALSE, TRUE);
  g_thread_pool_free (pool3, FALSE, TRUE);

  g_assert (runs * 3 == abs_thread_counter + leftover_task_counter);
  g_assert (running_thread_counter == 0);
}

static gint
test_thread_sort_compare_func (gconstpointer a, gconstpointer b, gpointer user_data)
{
  guint32 id1, id2;

  id1 = GPOINTER_TO_UINT (a);
  id2 = GPOINTER_TO_UINT (b);

  return (id1 > id2 ? +1 : id1 == id2 ? 0 : -1);
}

static void
test_thread_sort_entry_func (gpointer data, gpointer user_data)
{
  guint thread_id;
  gboolean is_sorted;

  G_LOCK (last_thread);

  thread_id = GPOINTER_TO_UINT (data);
  is_sorted = GPOINTER_TO_INT (user_data);

  DEBUG_MSG (("%s ---> entered thread:%2.2d, last thread:%2.2d",
	      is_sorted ? "[  sorted]" : "[unsorted]",
	      thread_id, last_thread_id));

  if (is_sorted) {
    static gboolean last_failed = FALSE;

    if (last_thread_id > thread_id) {
      if (last_failed) {
	g_assert (last_thread_id <= thread_id);
      }

      /* Here we remember one fail and if it concurrently fails, it
       * can not be sorted. the last thread id might be < this thread
       * id if something is added to the queue since threads were
       * created
       */
      last_failed = TRUE;
    } else {
      last_failed = FALSE;
    }

    last_thread_id = thread_id;
  }

  G_UNLOCK (last_thread);

  g_usleep (WAIT * 1000);
}

static void
test_thread_sort (gboolean sort)
{
  GThreadPool *pool;
  guint limit;
  guint max_threads;
  gint i;

  limit = MAX_THREADS * 10;

  if (sort) {
    max_threads = 1;
  } else {
    max_threads = MAX_THREADS;
  }

  /* It is important that we only have a maximum of 1 thread for this
   * test since the results can not be guaranteed to be sorted if > 1.
   *
   * Threads are scheduled by the operating system and are executed at
   * random. It cannot be assumed that threads are executed in the
   * order they are created. This was discussed in bug #334943.
   */

  pool = g_thread_pool_new (test_thread_sort_entry_func,
			    GINT_TO_POINTER (sort),
			    max_threads,
			    FALSE,
			    NULL);

  g_thread_pool_set_max_unused_threads (MAX_UNUSED_THREADS);

  if (sort) {
    g_thread_pool_set_sort_function (pool,
				     test_thread_sort_compare_func,
				     GUINT_TO_POINTER (69));
  }

  for (i = 0; i < limit; i++) {
    guint id;

    id = g_random_int_range (1, limit) + 1;
    g_thread_pool_push (pool, GUINT_TO_POINTER (id), NULL);
    DEBUG_MSG (("%s ===> pushed new thread with id:%d, number "
		"of threads:%d, unprocessed:%d",
		sort ? "[  sorted]" : "[unsorted]",
		id,
		g_thread_pool_get_num_threads (pool),
		g_thread_pool_unprocessed (pool)));
  }

  g_assert (g_thread_pool_get_max_threads (pool) == max_threads);
  g_assert (g_thread_pool_get_num_threads (pool) == g_thread_pool_get_max_threads (pool));
}

static void
test_thread_idle_time_entry_func (gpointer data, gpointer user_data)
{
#ifdef DEBUG
  guint thread_id;

  thread_id = GPOINTER_TO_UINT (data);
#endif

  DEBUG_MSG (("[idle] ---> entered thread:%2.2d", thread_id));

  g_usleep (WAIT * 1000);

  DEBUG_MSG (("[idle] <--- exiting thread:%2.2d", thread_id));
}

static gboolean
test_thread_idle_timeout (gpointer data)
{
  gint i;

  for (i = 0; i < 2; i++) {
    g_thread_pool_push (idle_pool, GUINT_TO_POINTER (100 + i), NULL);
    DEBUG_MSG (("[idle] ===> pushed new thread with id:%d, number "
		"of threads:%d, unprocessed:%d",
		100 + i,
		g_thread_pool_get_num_threads (idle_pool),
		g_thread_pool_unprocessed (idle_pool)));
  }


  return FALSE;
}

static void
test_thread_idle_time (void)
{
  guint limit = 50;
  guint interval = 10000;
  gint i;

  idle_pool = g_thread_pool_new (test_thread_idle_time_entry_func,
				 NULL,
				 0,
				 FALSE,
				 NULL);

  g_thread_pool_set_max_threads (idle_pool, MAX_THREADS, NULL);
  g_thread_pool_set_max_unused_threads (MAX_UNUSED_THREADS);
  g_thread_pool_set_max_idle_time (interval);

  g_assert (g_thread_pool_get_max_threads (idle_pool) == MAX_THREADS);
  g_assert (g_thread_pool_get_max_unused_threads () == MAX_UNUSED_THREADS);
  g_assert (g_thread_pool_get_max_idle_time () == interval);

  for (i = 0; i < limit; i++) {
    g_thread_pool_push (idle_pool, GUINT_TO_POINTER (i + 1), NULL);
    DEBUG_MSG (("[idle] ===> pushed new thread with id:%d, "
		"number of threads:%d, unprocessed:%d",
		i,
		g_thread_pool_get_num_threads (idle_pool),
		g_thread_pool_unprocessed (idle_pool)));
  }

  g_assert_cmpint (g_thread_pool_unprocessed (idle_pool), <=, limit);

  g_timeout_add ((interval - 1000),
		 test_thread_idle_timeout,
		 GUINT_TO_POINTER (interval));
}

static gboolean
test_check_start_and_stop (gpointer user_data)
{
  static guint test_number = 0;
  static gboolean run_next = FALSE;
  gboolean continue_timeout = TRUE;
  gboolean quit = TRUE;

  if (test_number == 0) {
    run_next = TRUE;
    DEBUG_MSG (("***** RUNNING TEST %2.2d *****", test_number));
  }

  if (run_next) {
    test_number++;

    switch (test_number) {
    case 1:
      test_thread_functions ();
      break;
    case 2:
      test_thread_stop_unused ();
      break;
    case 3:
      test_thread_pools ();
      break;
    case 4:
      test_thread_sort (FALSE);
      break;
    case 5:
      test_thread_sort (TRUE);
      break;
    case 6:
      test_thread_stop_unused ();
      break;
    case 7:
      test_thread_idle_time ();
      break;
    default:
      DEBUG_MSG (("***** END OF TESTS *****"));
      g_main_loop_quit (main_loop);
      continue_timeout = FALSE;
      break;
    }

    run_next = FALSE;
    return TRUE;
  }

  if (test_number == 3) {
    G_LOCK (thread_counter_pools);
    quit &= running_thread_counter <= 0;
    DEBUG_MSG (("***** POOL RUNNING THREAD COUNT:%ld",
		running_thread_counter));
    G_UNLOCK (thread_counter_pools);
  }

  if (test_number == 4 || test_number == 5) {
    G_LOCK (thread_counter_sort);
    quit &= sort_thread_counter <= 0;
    DEBUG_MSG (("***** POOL SORT THREAD COUNT:%ld",
		sort_thread_counter));
    G_UNLOCK (thread_counter_sort);
  }

  if (test_number == 7) {
    guint idle;

    idle = g_thread_pool_get_num_unused_threads ();
    quit &= idle < 1;
    DEBUG_MSG (("***** POOL IDLE THREAD COUNT:%d, UNPROCESSED JOBS:%d",
		idle, g_thread_pool_unprocessed (idle_pool)));
  }

  if (quit) {
    run_next = TRUE;
  }

  return continue_timeout;
}

int
main (int argc, char *argv[])
{
  DEBUG_MSG (("Starting... (in one second)"));
  g_timeout_add (1000, test_check_start_and_stop, NULL);

  main_loop = g_main_loop_new (NULL, FALSE);
  g_main_loop_run (main_loop);
  g_main_loop_unref (main_loop);

  g_thread_pool_free (idle_pool, FALSE, TRUE);
  return 0;
}