From 15b079d79c99ed77b90ed510f9666612d518c5cc Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@rambler-co.ru>
Date: Mon, 7 Nov 2011 19:58:54 +0300
Subject: [PATCH] Release read lock lately.

---
 src/buffer.c           |  3 +++
 src/kvstorage_server.c | 26 ++++++++++++++++++++++++--
 src/kvstorage_server.h |  1 +
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/buffer.c b/src/buffer.c
index e647374c2..2413fbbeb 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -187,6 +187,9 @@ write_buffers (gint fd, rspamd_io_dispatcher_t * d, gboolean is_delayed)
 	len = g_queue_get_length (d->out_buffers);
 	if (len > 1) {
 		/* IOV version */
+
+		/* Unset delayed as actually we HAVE buffers to write */
+		is_delayed = TRUE;
 		cur = d->out_buffers->tail;
 		iov = g_slice_alloc (len * sizeof (struct iovec));
 		i = 0;
diff --git a/src/kvstorage_server.c b/src/kvstorage_server.c
index 370384159..620c5c73f 100644
--- a/src/kvstorage_server.c
+++ b/src/kvstorage_server.c
@@ -396,6 +396,8 @@ kvstorage_read_socket (f_str_t * in, void *arg)
 					}
 				}
 				else {
+					session->elt = elt;
+
 					if (!is_redis) {
 						r = rspamd_snprintf (outbuf, sizeof (outbuf), "VALUE %s %ud %ud" CRLF,
 								ELT_KEY (elt), elt->flags, elt->size);
@@ -421,7 +423,10 @@ kvstorage_read_socket (f_str_t * in, void *arg)
 						res = rspamd_dispatcher_write (session->dispather, CRLF,
 								sizeof (CRLF) - 1, FALSE, TRUE);
 					}
-					g_static_rw_lock_reader_unlock (&session->cf->storage->rwlock);
+					if (!res) {
+						g_static_rw_lock_reader_unlock (&session->cf->storage->rwlock);
+					}
+
 					return res;
 				}
 			}
@@ -525,6 +530,22 @@ kvstorage_read_socket (f_str_t * in, void *arg)
 	return TRUE;
 }
 
+/*
+ * Called if buffers were written
+ */
+static gboolean
+kvstorage_write_socket (void *arg)
+{
+	struct kvstorage_session			*session = (struct kvstorage_session *) arg;
+
+	if (session->elt) {
+		g_static_rw_lock_reader_unlock (&session->cf->storage->rwlock);
+		session->elt = NULL;
+	}
+
+	return TRUE;
+}
+
 /*
  * Called if something goes wrong
  */
@@ -573,8 +594,9 @@ thr_accept_socket (gint fd, short what, void *arg)
 	session->thr = thr;
 	session->sock = nfd;
 	session->dispather = rspamd_create_dispatcher (thr->ev_base, nfd, BUFFER_LINE,
-			kvstorage_read_socket, NULL,
+			kvstorage_read_socket, kvstorage_write_socket,
 			kvstorage_err_socket, thr->tv, session);
+	session->elt = NULL;
 
 	if (su.ss.ss_family == AF_UNIX) {
 		session->client_addr.s_addr = INADDR_NONE;
diff --git a/src/kvstorage_server.h b/src/kvstorage_server.h
index 4f9e8c951..3b475ebd0 100644
--- a/src/kvstorage_server.h
+++ b/src/kvstorage_server.h
@@ -73,6 +73,7 @@ struct kvstorage_session {
 	gchar *key;
 	struct kvstorage_config *cf;
 	struct kvstorage_worker_thread *thr;
+	struct rspamd_kv_element *elt;
 	struct in_addr client_addr;
 	gint sock;
 	guint flags;
-- 
2.39.5