[Spice-devel] [spice-gtk v2 3/7] channel-main: clipboard grab: wakeup only when needed

[Victor Toso]

From: Victor Toso <me at victortoso.com>

This patch makes agent_clipboard_grab() to return true only when the
message request to the agent is successfully queued to be sent.

By checking the return value, we can avoid wakup the channel
unnecessarily at spice_main_channel_clipboard_selection_request()

Signed-off-by: Victor Toso <victortoso at redhat.com>
---
 src/channel-main.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/channel-main.c b/src/channel-main.c
index fb7175e..21afd87 100644
--- a/src/channel-main.c
+++ b/src/channel-main.c
@@ -1341,8 +1341,9 @@ static void agent_announce_caps(SpiceMainChannel *channel)
 }
 
 /* any context: the message is not flushed immediately,
-   you can wakeup() the channel coroutine or send_msg_queue() */
-static void agent_clipboard_grab(SpiceMainChannel *channel, guint selection,
+   you can wakeup() the channel coroutine or send_msg_queue()
+   Returns true if message was queued. */
+static bool agent_clipboard_grab(SpiceMainChannel *channel, guint selection,
                                  guint32 *types, int ntypes)
 {
     SpiceMainChannelPrivate *c = channel->priv;
@@ -1352,16 +1353,16 @@ static void agent_clipboard_grab(SpiceMainChannel *channel, guint selection,
     int i;
 
     if (!c->agent_connected)
-        return;
+        return false;
 
-    g_return_if_fail(test_agent_cap(channel, VD_AGENT_CAP_CLIPBOARD_BY_DEMAND));
+    g_return_val_if_fail(test_agent_cap(channel, VD_AGENT_CAP_CLIPBOARD_BY_DEMAND), false);
 
     size = sizeof(VDAgentClipboardGrab) + sizeof(uint32_t) * ntypes;
     if (test_agent_cap(channel, VD_AGENT_CAP_CLIPBOARD_SELECTION)) {
         size += 4;
     } else if (selection != VD_AGENT_CLIPBOARD_SELECTION_CLIPBOARD) {
         CHANNEL_DEBUG(channel, "Ignoring clipboard grab");
-        return;
+        return false;
     }
 
     msg = g_alloca(size);
@@ -1379,6 +1380,7 @@ static void agent_clipboard_grab(SpiceMainChannel *channel, guint selection,
     }
 
     agent_msg_queue(channel, VD_AGENT_CLIPBOARD_GRAB, size, msg);
+    return true;
 }
 
 /* any context: the message is not flushed immediately,
@@ -2771,8 +2773,9 @@ void spice_main_channel_clipboard_selection_grab(SpiceMainChannel *channel, guin
     g_return_if_fail(channel != NULL);
     g_return_if_fail(SPICE_IS_MAIN_CHANNEL(channel));
 
-    agent_clipboard_grab(channel, selection, types, ntypes);
-    spice_channel_wakeup(SPICE_CHANNEL(channel), FALSE);
+    if (agent_clipboard_grab(channel, selection, types, ntypes)) {
+        spice_channel_wakeup(SPICE_CHANNEL(channel), FALSE);
+    }
 }
 
 /**
-- 
2.19.2