X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=chunk_queue.c;h=3f5ac1d929262c116f6c7822f67f0ceb8cf1e7f6;hp=e8ea07d93ff1cc10cfe1888ce283630505642a24;hb=ffb2eaa90429f6d5c3d369509efcdf91c5463dad;hpb=b0fe6d882dd35b01360a66e130d6714aff7b6a0d

diff --git a/chunk_queue.c b/chunk_queue.c
index e8ea07d9..3f5ac1d9 100644
--- a/chunk_queue.c
+++ b/chunk_queue.c
@@ -94,6 +94,34 @@ void cq_dequeue(struct chunk_queue *cq)
 	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.
  *