X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=chunk_queue.c;h=5b102f286641d7b93418f3ae92e7dcdf6f71d0f6;hb=5667dca4697c3bbbe4830699ee91df800bf2efd3;hp=ad28190a163d32c4731316a3bd609f626f7871ec;hpb=c1d6c466251d21d1fb7b513ba2297ebf94d44853;p=paraslash.git

diff --git a/chunk_queue.c b/chunk_queue.c
index ad28190a..5b102f28 100644
--- a/chunk_queue.c
+++ b/chunk_queue.c
@@ -92,6 +92,34 @@ 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.
  *