Don't create thunk for CreateThread16 proc, call it directly.

scheduler/thread.c

@@ -27,6 +27,7 @@
 #include "server.h"
 #include "services.h"
 #include "stackframe.h"
+#include "builtin16.h"
 #include "debugtools.h"
 #include "queue.h"
 #include "hook.h"
@@ -307,6 +308,30 @@ HANDLE WINAPI CreateThread( SECURITY_ATTRIBUTES *sa, DWORD stack,
     return handle;
 }
 
+/***********************************************************************
+ *           CreateThread16   (KERNEL.441)
+ */
+static DWORD CALLBACK THREAD_StartThread16( LPVOID threadArgs )
+{
+    FARPROC16 start = ((FARPROC16 *)threadArgs)[0];
+    DWORD     param = ((DWORD *)threadArgs)[1];
+    HeapFree( GetProcessHeap(), 0, threadArgs );
+
+    ((LPDWORD)CURRENT_STACK16)[-1] = param;
+    return CallTo16Long( start, sizeof(DWORD) );
+}
+HANDLE WINAPI CreateThread16( SECURITY_ATTRIBUTES *sa, DWORD stack,
+                              FARPROC16 start, SEGPTR param,
+                              DWORD flags, LPDWORD id )
+{
+    DWORD *threadArgs = HeapAlloc( GetProcessHeap(), 0, 2*sizeof(DWORD) );
+    if (!threadArgs) return INVALID_HANDLE_VALUE;
+    threadArgs[0] = (DWORD)start;
+    threadArgs[1] = (DWORD)param;
+
+    return CreateThread( sa, stack, THREAD_StartThread16, threadArgs, flags, id );
+}
+
 
 /***********************************************************************
  * ExitThread [KERNEL32.215]  Ends a thread