evas: Don't wake up prepare thread when there is nothing to do.

SVN revision: 71543

legacy/evas/ChangeLog

@@ -771,4 +771,7 @@
 	* Fixed to clean up when map actually changed. Now rendering updates will be
 	correct after evas_map acutally disabled/enabled for the smart object.
 
+2012-05-30  Cedric Bail
+
+	* Don't wake up prepare thread if there is nothing to prepare.
 

legacy/evas/NEWS

@@ -6,6 +6,7 @@ Changes since Evas 1.2.0:
 Improvements:
    * Lock less font rendering.
    * Reduce cost of propagating event by limiting the object we explore by using a bouncing box.
+   * Don't wake up prepare thread if there is nothing to prepare.
 
 Fixes:
    * Add missing files in the tarball.

legacy/evas/src/lib/engines/common/evas_pipe.c

@@ -700,6 +700,8 @@ static void
 evas_common_pipe_load_do(void)
 {
 #ifdef BUILD_PTHREAD
+  if (!im_task && !text_task) return ;
+
   /* Notify worker thread. */
   pthread_barrier_wait(&(task_thbarrier[0]));