diff --git a/src/misc/alloc.c b/src/misc/alloc.c
index 425c7fe9f..62c98e411 100644
--- a/src/misc/alloc.c
+++ b/src/misc/alloc.c
@@ -2,6 +2,11 @@
 Copyright 1990 Regents of the University of California.  All rights reserved.
 **********/
 
+/* for thread handling */
+#if defined __MINGW32__ || defined _MSC_VER
+#include <windows.h>
+#endif
+
 /*
  * Memory alloction functions
  */
@@ -9,10 +14,32 @@ Copyright 1990 Regents of the University of California.  All rights reserved.
 
 /* We need this because some tests in cmaths and some executables other
    than ngspice and ngnutmeg under LINUX don't know about controlled_exit */
-#ifdef HAS_WINGUI
+#if defined HAS_WINGUI || defined SHARED_MODULE
 extern void controlled_exit(int status);
 #endif
 
+#ifdef SHARED_MODULE
+#ifndef HAVE_LIBPTHREAD
+#ifdef SRW
+#define mutex_lock(a) AcquireSRWLockExclusive(a)
+#define mutex_unlock(a) ReleaseSRWLockExclusive(a)
+typedef SRWLOCK mutexType;
+#else
+#define mutex_lock(a) EnterCriticalSection(a)
+#define mutex_unlock(a) LeaveCriticalSection(a)
+typedef CRITICAL_SECTION mutexType;
+#endif
+extern mutexType allocMutex;
+#else
+#include <pthread.h>
+#define mutex_lock(a) pthread_mutex_lock(a)
+#define mutex_unlock(a) pthread_mutex_unlock(a)
+typedef pthread_mutex_t mutexType;
+extern mutexType allocMutex;
+#endif
+#endif
+
+
 #ifndef HAVE_LIBGC
 
 /*saj For Tcl module locking*/
@@ -40,15 +67,19 @@ tmalloc(size_t num)
 /*saj*/
 #ifdef TCL_MODULE
   Tcl_MutexLock(alloc);
+#elif defined SHARED_MODULE
+  mutex_lock(&allocMutex);
 #endif
     s = calloc(num,1);
 /*saj*/
 #ifdef TCL_MODULE
   Tcl_MutexUnlock(alloc);
+#elif defined SHARED_MODULE
+  mutex_unlock(&allocMutex);
 #endif
     if (!s){
       fprintf(stderr,"malloc: Internal Error: can't allocate %ld bytes. \n",(long)num);
-#ifdef HAS_WINGUI
+#if defined HAS_WINGUI || defined SHARED_MODULE
       controlled_exit(EXIT_FAILURE);
 #else
       exit(EXIT_FAILURE);
@@ -79,16 +110,20 @@ trealloc(void *ptr, size_t num)
 /*saj*/
 #ifdef TCL_MODULE
     Tcl_MutexLock(alloc);
+#elif defined SHARED_MODULE
+  mutex_lock(&allocMutex);
 #endif
     s = realloc(ptr, num);
 /*saj*/
 #ifdef TCL_MODULE
   Tcl_MutexUnlock(alloc);
+#elif defined SHARED_MODULE
+  mutex_unlock(&allocMutex);
 #endif
   }
   if (!s) {
     fprintf(stderr,"realloc: Internal Error: can't allocate %ld bytes.\n", (long)num);
-#ifdef HAS_WINGUI
+#if defined HAS_WINGUI || defined SHARED_MODULE
       controlled_exit(EXIT_FAILURE);
 #else
       exit(EXIT_FAILURE);
@@ -106,12 +141,17 @@ txfree(void *ptr)
   Tcl_Mutex *alloc;
   alloc = Tcl_GetAllocMutex();
   Tcl_MutexLock(alloc);
+#endif
+#ifdef SHARED_MODULE
+  mutex_lock(&allocMutex);
 #endif
 	if (ptr)
 		free(ptr);
 /*saj*/
 #ifdef TCL_MODULE
   Tcl_MutexUnlock(alloc);
+#elif defined SHARED_MODULE
+  mutex_unlock(&allocMutex);
 #endif
 }
 
diff --git a/src/sharedspice.c b/src/sharedspice.c
index 2b3eb22f2..ea4820db2 100644
--- a/src/sharedspice.c
+++ b/src/sharedspice.c
@@ -8,7 +8,6 @@
 /*******************/
 /*   Defines       */
 /*******************/
-#define CS
 
 #ifdef _MSC_VER
 #define SHAREDSPICE_version "25.1"
@@ -61,14 +60,14 @@ myfputc(int inp, FILE* f)
 
 #if defined(__MINGW32__) || defined(_MSC_VER)
 //#if defined(_MSC_VER)
-#ifdef CS
-#define mutex_lock(a) EnterCriticalSection(a)
-#define mutex_unlock(a) LeaveCriticalSection(a)
-typedef CRITICAL_SECTION mutexType;
-#else
+#ifdef SRW
 #define mutex_lock(a) AcquireSRWLockExclusive(a)
 #define mutex_unlock(a) ReleaseSRWLockExclusive(a)
 typedef SRWLOCK mutexType;
+#else
+#define mutex_lock(a) EnterCriticalSection(a)
+#define mutex_unlock(a) LeaveCriticalSection(a)
+typedef CRITICAL_SECTION mutexType;
 #endif
 #define thread_self() GetCurrentThread()
 #define threadid_self() GetThreadId(GetCurrentThread())
@@ -313,7 +312,7 @@ _thread_stop(void)
             ft_intrpt = TRUE;
             timeout++;
 #if defined(__MINGW32__) || defined(_MSC_VER)
-            Sleep(100); // va: windows native
+            Sleep(50); // va: windows native
 #else
             usleep(10000);
 #endif
@@ -479,14 +478,14 @@ ngSpice_Init(SendChar* printfcn, SendStat* statusfcn, ControlledExit* ngspiceexi
     pthread_mutex_init(&allocMutex, NULL);
     pthread_mutex_init(&fputsMutex, NULL);
 #else
-#ifdef CS
-    InitializeCriticalSection(&triggerMutex);
-    InitializeCriticalSection(&allocMutex);
-    InitializeCriticalSection(&fputsMutex);
-#else
+#ifdef SRW
     InitializeSRWLock(&triggerMutex);
     InitializeSRWLock(&allocMutex);
     InitializeSRWLock(&fputsMutex);
+#else
+    InitializeCriticalSection(&triggerMutex);
+    InitializeCriticalSection(&allocMutex);
+    InitializeCriticalSection(&fputsMutex);
 #endif
 #endif
     // Id of primary thread
@@ -1384,6 +1383,7 @@ int sh_ExecutePerLoop(void)
 {
     struct dvec *d;
     int i, veclen;
+    double testval;
     struct plot *pl = plot_cur;
     /* return immediately if callback not wanted */
     if (nodatawanted)
@@ -1395,6 +1395,7 @@ int sh_ExecutePerLoop(void)
         /* test if real */
         if (d->v_flags & VF_REAL) {
             curvecvalsall->vecsa[i]->is_complex = FALSE;
+            testval = d->v_realdata[veclen];
             curvecvalsall->vecsa[i]->creal = d->v_realdata[veclen];
             curvecvalsall->vecsa[i]->cimag = 0.;
         }