[Bf-blender-cvs] [3819a9b15a1] master: Fix T103614: crash during geometry nodes evaluation with tbb disabled

[Jacques Lucke]

Commit: 3819a9b15a1936753cc50e4535d27aebe81ae568
Author: Jacques Lucke
Date:   Thu Jan 5 15:36:24 2023 +0100
Branches: master
https://developer.blender.org/rB3819a9b15a1936753cc50e4535d27aebe81ae568

Fix T103614: crash during geometry nodes evaluation with tbb disabled

===================================================================

M	source/blender/functions/intern/lazy_function_graph_executor.cc

===================================================================

diff --git a/source/blender/functions/intern/lazy_function_graph_executor.cc b/source/blender/functions/intern/lazy_function_graph_executor.cc
index fc74b3cd213..ab7dfba196a 100644
--- a/source/blender/functions/intern/lazy_function_graph_executor.cc
+++ b/source/blender/functions/intern/lazy_function_graph_executor.cc
@@ -1073,6 +1073,12 @@ class Executor {
 
   bool try_enable_multi_threading()
   {
+#ifndef WITH_TBB
+    /* The non-tbb task pool has the property that it immediately executes tasks under some
+     * circumstances. This is not supported here because tasks might be scheduled while another
+     * node is in the middle of being executed on the same thread. */
+    return false;
+#endif
     if (this->use_multi_threading()) {
       return true;
     }