From 09dc4e3b8455e302ee42547f39a6bfbb13a87378 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Fri, 22 Aug 2008 23:43:05 +0000
Subject: [PATCH] add async-load-delay

---
 panda/src/pgraph/config_pgraph.cxx    | 10 ++++++++++
 panda/src/pgraph/config_pgraph.h      |  1 +
 panda/src/pgraph/modelLoadRequest.cxx |  6 ++++++
 3 files changed, 17 insertions(+)

diff --git a/panda/src/pgraph/config_pgraph.cxx b/panda/src/pgraph/config_pgraph.cxx
index 82f61aef50..7164850d35 100644
--- a/panda/src/pgraph/config_pgraph.cxx
+++ b/panda/src/pgraph/config_pgraph.cxx
@@ -274,6 +274,16 @@ ConfigVariableBool flatten_geoms
           "only the NodePath interfaces; you may still make the lower-level "
           "SceneGraphReducer calls directly."));
 
+ConfigVariableDouble async_load_delay
+("async-load-delay", 0.0,
+PRC_DESC("If this is nonzero, it represents an artificial delay, "
+         "in seconds, that is imposed on every asynchronous load attempt "
+         "(within the thread).  Its purpose is to help debug errors that "
+         "may occur when an asynchronous load is delayed.  The "
+         "delay is per-model, and all aync loads will be queued "
+         "up behind the delay--it is as if the time it takes to read a "
+         "file is increased by this amount per read."));
+
 ConfigVariableBool polylight_info
 ("polylight-info", false,
  PRC_DESC("Set this true to view some info statements regarding the polylight. "
diff --git a/panda/src/pgraph/config_pgraph.h b/panda/src/pgraph/config_pgraph.h
index 09d88daef7..f163825042 100644
--- a/panda/src/pgraph/config_pgraph.h
+++ b/panda/src/pgraph/config_pgraph.h
@@ -53,6 +53,7 @@ extern ConfigVariableInt max_collect_indices;
 extern ConfigVariableBool premunge_data;
 extern ConfigVariableBool preserve_geom_nodes;
 extern ConfigVariableBool flatten_geoms;
+extern ConfigVariableDouble async_load_delay;
 
 extern ConfigVariableBool polylight_info;
 extern ConfigVariableDouble lod_fade_time;
diff --git a/panda/src/pgraph/modelLoadRequest.cxx b/panda/src/pgraph/modelLoadRequest.cxx
index e406353494..ea9bf4e14e 100644
--- a/panda/src/pgraph/modelLoadRequest.cxx
+++ b/panda/src/pgraph/modelLoadRequest.cxx
@@ -14,6 +14,7 @@
 
 #include "modelLoadRequest.h"
 #include "loader.h"
+#include "config_pgraph.h"
 
 TypeHandle ModelLoadRequest::_type_handle;
 
@@ -24,6 +25,11 @@ TypeHandle ModelLoadRequest::_type_handle;
 ////////////////////////////////////////////////////////////////////
 bool ModelLoadRequest::
 do_task() {
+  double delay = async_load_delay;
+  if (delay != 0.0) {
+    Thread::sleep(delay);
+  }
+
   Loader *loader;
   DCAST_INTO_R(loader, _manager, false);