From 835b3cbee620e86b8bf9f11148610719f1400864 Mon Sep 17 00:00:00 2001
From: dpasukhi <dpasukhi@opencascade.com>
Date: Thu, 14 Mar 2024 22:56:41 +0000
Subject: [PATCH] 0033643: Data Exchange, Step Import - Multithread loading
 model issue

Workaround for isolate loading entities functionality
  Needs to update logic to process in different threads different model three
---
 src/StepFile/StepFile_Read.cxx | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/StepFile/StepFile_Read.cxx b/src/StepFile/StepFile_Read.cxx
index 26319a7c43..72a4a27749 100644
--- a/src/StepFile/StepFile_Read.cxx
+++ b/src/StepFile/StepFile_Read.cxx
@@ -42,10 +42,17 @@
 
 #include <stdio.h>
 
+#include <Standard_Mutex.hxx>
+
 #ifdef OCCT_DEBUG
 #define CHRONOMESURE
 #endif
 
+namespace
+{
+  static Standard_Mutex THE_GLOBAL_READ_MUTEX;
+}
+
 void StepFile_Interrupt(Standard_CString theErrorMessage, const Standard_Boolean theIsFail)
 {
   if (theErrorMessage == NULL)
@@ -109,7 +116,7 @@ static Standard_Integer StepFile_Read (const char* theName,
 #endif
 
   sout << "      ...    STEP File   Read    ...\n";
-
+  Standard_Mutex::Sentry aLocker(THE_GLOBAL_READ_MUTEX);
   Standard_Integer nbhead, nbrec, nbpar;
   aFileDataModel.GetFileNbR (&nbhead,&nbrec,&nbpar);  // renvoi par lex/yacc
   Handle(StepData_StepReaderData) undirec =