Exemplos de gst_data_queue_locked_is_empty em C++ (Cpp)

Exemplo n.º 1

Arquivo: gstdataqueue.c Projeto: kkonopko/gstreamer

/**
 * gst_data_queue_pop:
 * @queue: a #GstDataQueue.
 * @item: pointer to store the returned #GstDataQueueItem.
 *
 * Retrieves the first @item available on the @queue. If the queue is currently
 * empty, the call will block until at least one item is available, OR the
 * @queue is set to the flushing state.
 * MT safe.
 *
 * Returns: #TRUE if an @item was successfully retrieved from the @queue.
 *
 * Since: 1.2.0
 */
gboolean
gst_data_queue_pop (GstDataQueue * queue, GstDataQueueItem ** item)
{
  GstDataQueuePrivate *priv = queue->priv;

  g_return_val_if_fail (GST_IS_DATA_QUEUE (queue), FALSE);
  g_return_val_if_fail (item != NULL, FALSE);

  GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);

  STATUS (queue, "before popping");

  if (gst_data_queue_locked_is_empty (queue)) {
    GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
    if (G_LIKELY (priv->emptycallback))
      priv->emptycallback (queue, priv->checkdata);
    else
      g_signal_emit (queue, gst_data_queue_signals[SIGNAL_EMPTY], 0);
    GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);

    while (gst_data_queue_locked_is_empty (queue)) {
      priv->waiting_add = TRUE;
      g_cond_wait (&priv->item_add, &priv->qlock);
      priv->waiting_add = FALSE;
      if (priv->flushing)
        goto flushing;
    }
  }

  /* Get the item from the GQueue */
  *item = gst_queue_array_pop_head (priv->queue);

  /* update current level counter */
  if ((*item)->visible)
    priv->cur_level.visible--;
  priv->cur_level.bytes -= (*item)->size;
  priv->cur_level.time -= (*item)->duration;

  STATUS (queue, "after popping");
  if (priv->waiting_del)
    g_cond_signal (&priv->item_del);

  GST_DATA_QUEUE_MUTEX_UNLOCK (queue);

  return TRUE;

  /* ERRORS */
flushing:
  {
    GST_DEBUG ("queue:%p, we are flushing", queue);
    GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
    return FALSE;
  }
}

Exemplo n.º 2

Arquivo: gstdataqueue.c Projeto: kuailexs/symbiandump-mw1

EXPORT_C
#endif

gboolean
gst_data_queue_pop (GstDataQueue * queue, GstDataQueueItem ** item)
{
  g_return_val_if_fail (GST_IS_DATA_QUEUE (queue), FALSE);
  g_return_val_if_fail (item != NULL, FALSE);

  GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);

  STATUS (queue, "before popping");

  if (gst_data_queue_locked_is_empty (queue)) {
    GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
    g_signal_emit (G_OBJECT (queue), gst_data_queue_signals[SIGNAL_EMPTY], 0);
    GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);

    while (gst_data_queue_locked_is_empty (queue)) {
      g_cond_wait (queue->item_add, queue->qlock);
      if (queue->flushing)
        goto flushing;
    }
  }

  /* Get the item from the GQueue */
  *item = g_queue_pop_head (queue->queue);

  /* update current level counter */
  if ((*item)->visible)
    queue->cur_level.visible--;
  queue->cur_level.bytes -= (*item)->size;
  queue->cur_level.time -= (*item)->duration;

  STATUS (queue, "after popping");
  g_cond_signal (queue->item_del);

  GST_DATA_QUEUE_MUTEX_UNLOCK (queue);

  return TRUE;

  /* ERRORS */
flushing:
  {
    GST_DEBUG ("queue:%p, we are flushing", queue);
    GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
    return FALSE;
  }
}

Exemplo n.º 3

Arquivo: gstdataqueue.c Projeto: chrisalex1117/zgstreamer

/**
 * gst_data_queue_is_empty:
 * @queue: a #GstDataQueue.
 *
 * Queries if there are any items in the @queue.
 * MT safe.
 *
 * Returns: #TRUE if @queue is empty.
 *
 * Since: 1.2.0
 */
gboolean
gst_data_queue_is_empty (GstDataQueue * queue)
{
  gboolean res;

  GST_DATA_QUEUE_MUTEX_LOCK (queue);
  res = gst_data_queue_locked_is_empty (queue);
  GST_DATA_QUEUE_MUTEX_UNLOCK (queue);

  return res;
}

Exemplo n.º 4

Arquivo: gstdataqueue.c Projeto: chrisalex1117/zgstreamer

static gboolean
_gst_data_queue_wait_non_empty (GstDataQueue * queue)
{
  GstDataQueuePrivate *priv = queue->priv;

  while (gst_data_queue_locked_is_empty (queue)) {
    priv->waiting_add = TRUE;
    g_cond_wait (&priv->item_add, &priv->qlock);
    priv->waiting_add = FALSE;
    if (priv->flushing)
      return FALSE;
  }
  return TRUE;
}

Exemplo n.º 5

Arquivo: gstdataqueue.c Projeto: chrisalex1117/zgstreamer

/**
 * gst_data_queue_peek:
 * @queue: a #GstDataQueue.
 * @item: pointer to store the returned #GstDataQueueItem.
 *
 * Retrieves the first @item available on the @queue without removing it.
 * If the queue is currently empty, the call will block until at least
 * one item is available, OR the @queue is set to the flushing state.
 * MT safe.
 *
 * Returns: #TRUE if an @item was successfully retrieved from the @queue.
 *
 * Since: 1.2.0
 */
gboolean
gst_data_queue_peek (GstDataQueue * queue, GstDataQueueItem ** item)
{
  GstDataQueuePrivate *priv = queue->priv;

  g_return_val_if_fail (GST_IS_DATA_QUEUE (queue), FALSE);
  g_return_val_if_fail (item != NULL, FALSE);

  GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);

  STATUS (queue, "before peeking");

  if (gst_data_queue_locked_is_empty (queue)) {
    GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
    if (G_LIKELY (priv->emptycallback))
      priv->emptycallback (queue, priv->checkdata);
    else
      g_signal_emit (queue, gst_data_queue_signals[SIGNAL_EMPTY], 0);
    GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);

    if (!_gst_data_queue_wait_non_empty (queue))
      goto flushing;
  }

  /* Get the item from the GQueue */
  *item = gst_queue_array_peek_head (priv->queue);

  STATUS (queue, "after peeking");
  GST_DATA_QUEUE_MUTEX_UNLOCK (queue);

  return TRUE;

  /* ERRORS */
flushing:
  {
    GST_DEBUG ("queue:%p, we are flushing", queue);
    GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
    return FALSE;
  }
}