X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=chunk_queue.c;h=3f5ac1d929262c116f6c7822f67f0ceb8cf1e7f6;hp=bb97c6902ae92379b04033990598c958a8dd76b4;hb=a4f75cecaaee538edb7aae3f0ff19168a1dab59d;hpb=eecc102ad0abeb0335fe994bb72031a15b9090d7

diff --git a/chunk_queue.c b/chunk_queue.c
index bb97c690..3f5ac1d9 100644
--- a/chunk_queue.c
+++ b/chunk_queue.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2010 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -82,16 +82,46 @@ struct queued_chunk *cq_peek(struct chunk_queue *cq)
 /**
  * Remove the current chunk from the queue.
  *
- * \param cq The chunk to remove.
+ * \param cq The queue to remove from.
  */
 void cq_dequeue(struct chunk_queue *cq)
 {
 	struct queued_chunk *qc = cq_peek(cq);
 	assert(qc);
+	assert(cq->num_pending >= qc->num_bytes);
+	cq->num_pending -= qc->num_bytes;
 	list_del(&qc->node);
 	free(qc);
 }
 
+/**
+ * Force to add a chunk to the given queue.
+ *
+ * \param cq See \ref cq_enqueue.
+ * \param buf See \ref cq_enqueue.
+ * \param num_bytes See \ref cq_enqueue.
+ *
+ * If queuing the given buffer would result in exceeding the maximal queue
+ * size, buffers are dropped from the beginning of the queue. Note that this
+ * function still might fail.
+ *
+ * \return Standard.
+ */
+int cq_force_enqueue(struct chunk_queue *cq, const char *buf, size_t num_bytes)
+{
+	int ret;
+
+	if (num_bytes > cq->max_pending)
+		return -E_QUEUE;
+	for (;;) {
+		ret = cq_enqueue(cq, buf, num_bytes);
+		if (ret >= 0)
+			return ret;
+		cq_dequeue(cq);
+	}
+	/* never reached */
+}
+
 /**
  * Change the number of bytes sent for the current queued chunk.
  *