[gegl] node: serialize computed emits

[Ãyvind KolÃs <ok src gnome org>]

commit 7f7226fa2d4f4f395dcbb2bd2c26f27bb3d7bd5d
Author: Ãyvind KolÃs <pippin gimp org>
Date:   Tue Mar 13 04:01:47 2012 +0000

    node: serialize computed emits
    
    This makes GIMP only deal with one such update at a time. Still not sufficient
    for some thread handling.

 gegl/graph/gegl-node.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gegl/graph/gegl-node.c b/gegl/graph/gegl-node.c
index 1be5753..ddfdb48 100644
--- a/gegl/graph/gegl-node.c
+++ b/gegl/graph/gegl-node.c
@@ -1979,7 +1979,10 @@ void
 gegl_node_emit_computed (GeglNode *node,
                          const GeglRectangle *rect)
 {
+  static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
+  g_static_mutex_lock (&mutex);
   g_signal_emit (node, gegl_node_signals[COMPUTED], 0, rect, NULL, NULL);
+  g_static_mutex_unlock (&mutex);
 }
 
 static void