diff --git a/Compiler/Template/CodegenC.tpl b/Compiler/Template/CodegenC.tpl
index 0776e0e45d9..787a0646895 100644
--- a/Compiler/Template/CodegenC.tpl
+++ b/Compiler/Template/CodegenC.tpl
@@ -5156,7 +5156,7 @@ template functionHeaderImpl(String fname, list<Variable> fargs, list<Variable> o
   let inFnStr = if boolAnd(boxed,inFunc) then
     <<
     DLLExport
-    int in_<%fname%>(type_description * inArgs, type_description * outVar);
+    int in_<%fname%>(threadData_t *threadData, type_description * inArgs, type_description * outVar);
     >>
   match visibility
     case PROTECTED(__) then
@@ -5663,13 +5663,13 @@ template generateInFunc(Text fname, list<Variable> functionArguments, list<Varia
 ::=
   <<
   DLLExport
-  int in_<%fname%>(type_description * inArgs, type_description * outVar)
+  int in_<%fname%>(threadData_t *threadData, type_description * inArgs, type_description * outVar)
   {
-    if (!mmc_GC_state) mmc_GC_init();
+    //if (!mmc_GC_state) mmc_GC_init();
     <%functionArguments |> var => '<%funArgDefinition(var)%>;' ;separator="\n"%>
     <%outVars |> var => '<%funArgDefinition(var)%>;' ;separator="\n"%>
     <%functionArguments |> arg => readInVar(arg) ;separator="\n"%>
-    MMC_TRY_TOP()
+    MMC_TRY_TOP_INTERNAL()
     <%match outVars
         case v::_ then '<%funArgName(v)%> = '
       %>omc_<%fname%>(threadData<%functionArguments |> var => (", " + funArgName(var) )%><%List.restOrEmpty(outVars) |> var => (", &" + funArgName(var) )%>);
diff --git a/Compiler/Util/DynLoad.mo b/Compiler/Util/DynLoad.mo
index de29a94ca15..7ef2f8e23ed 100644
--- a/Compiler/Util/DynLoad.mo
+++ b/Compiler/Util/DynLoad.mo
@@ -47,7 +47,7 @@ of values."
   input Boolean inPrintDebug;
   output Values.Value outVal;
 
-  external "C" outVal=DynLoad_executeFunction(inFuncHandle,inValLst,inPrintDebug) annotation(Library = "omcruntime");
+  external "C" outVal=DynLoad_executeFunction(OpenModelica.threadData(),inFuncHandle,inValLst,inPrintDebug) annotation(Library = "omcruntime");
 end executeFunction;
 
 annotation(__OpenModelica_Interface="frontend");
diff --git a/Compiler/runtime/Dynload.cpp b/Compiler/runtime/Dynload.cpp
index e7642041159..8819e00509d 100644
--- a/Compiler/runtime/Dynload.cpp
+++ b/Compiler/runtime/Dynload.cpp
@@ -43,8 +43,9 @@ extern "C" {
 
 static void *type_desc_to_value(type_description *desc);
 static int value_to_type_desc(void *value, type_description *desc);
-static int execute_function(void *in_arg, void **out_arg,
-                            int (* func)(type_description *,
+static int execute_function(threadData_t* threadData, void *in_arg, void **out_arg,
+                            int (* func)(threadData_t*,
+                                         type_description *,
                                          type_description *), int printDebug);
 static int parse_array(type_description *desc, void *arrdata, void *dimLst);
 static void *value_to_mmc(void* value);
@@ -158,8 +159,10 @@ static int value_to_type_desc(void *value, type_description *desc)
   return 0;
 }
 
-static int execute_function(void *in_arg, void **out_arg,
-                            int (* func)(type_description *,
+static int execute_function(threadData_t* threadData,
+                            void *in_arg, void **out_arg,
+                            int (* func)(threadData_t*,
+                                         type_description *,
                                          type_description *), int printDebug)
 {
   type_description arglst[MMC_NUM_ARGS + 1], crashbuf[50], *arg = NULL;
@@ -199,7 +202,7 @@ static int execute_function(void *in_arg, void **out_arg,
   fflush(stdout);
   /* call our function pointer! */
   try { /* Don't let external C functions throwing C++ exceptions kill OMC! */
-    retval = func(arglst, &retarg);
+    retval = func(threadData, arglst, &retarg);
   } catch (...) {
     retval = 1;
   }
diff --git a/Compiler/runtime/Dynload_omc.cpp b/Compiler/runtime/Dynload_omc.cpp
index 114c2be3bd4..062812286a3 100644
--- a/Compiler/runtime/Dynload_omc.cpp
+++ b/Compiler/runtime/Dynload_omc.cpp
@@ -43,7 +43,7 @@ extern "C" {
 #include "Dynload.cpp"
 #include "ModelicaUtilities.h"
 
-extern void* DynLoad_executeFunction(int _inFuncHandle, void* _inValLst, int _inPrintDebug)
+extern void* DynLoad_executeFunction(threadData_t*  threadData, int _inFuncHandle, void* _inValLst, int _inPrintDebug)
 {
   modelica_ptr_t func = NULL;
   int retval = -1;
@@ -51,12 +51,13 @@ extern void* DynLoad_executeFunction(int _inFuncHandle, void* _inValLst, int _in
   func = lookup_ptr(_inFuncHandle);
   if (func == NULL) MMC_THROW();
 
-  retval = execute_function(_inValLst, &retarg, func->data.func.handle, _inPrintDebug);
+  retval = execute_function(threadData, _inValLst, &retarg, func->data.func.handle, _inPrintDebug);
   if (retval) MMC_THROW();
   return retarg;
 }
 
 extern void* omc_Absyn_pathString2(threadData_t*,void*,void*);
+
 static const char* path_to_name(void* path, char del)
 {
   threadData_t *threadData = (threadData_t *) pthread_getspecific(mmc_thread_data_key);
diff --git a/Compiler/runtime/printimpl.c b/Compiler/runtime/printimpl.c
index 2ab7b63741d..6acfae6ba42 100644
--- a/Compiler/runtime/printimpl.c
+++ b/Compiler/runtime/printimpl.c
@@ -346,7 +346,7 @@ static int PrintImpl__writeBuf(threadData_t *threadData,const char* filename)
   if (buf == NULL || buf[0]=='\0') {
     /* nothing to write to file, just close it and return ! */
     fclose(file);
-    return 1;
+    return 0;
   }
 
   /*  write 1 element of size nfilled to file and check for errors */
diff --git a/Compiler/runtime/systemimpl.h b/Compiler/runtime/systemimpl.h
index 3b9dfbfba1c..3a13d14d8b7 100644
--- a/Compiler/runtime/systemimpl.h
+++ b/Compiler/runtime/systemimpl.h
@@ -36,7 +36,7 @@ char* _replace(const char* source_str,
                const char* search_str,
                const char* replace_str);
 
-typedef int (*function_t)(type_description*, type_description*);
+typedef int (*function_t)(threadData_t*, type_description*, type_description*);
 
 #if defined(_MSC_VER) /* no gettext for VS! */
 #define gettext(str) str