kernel32: Add ExecuteUmsThread stub.

dlls/kernel32/kernel32.spec

@@ -437,7 +437,7 @@
 @ stdcall -arch=x86_64 EnterUmsSchedulingMode(ptr)
 @ stdcall EraseTape(ptr long long)
 @ stdcall EscapeCommFunction(long long)
-# @ stub -arch=x86_64 ExecuteUmsThread
+@ stdcall -arch=x86_64 ExecuteUmsThread(ptr)
 @ stdcall ExitProcess(long)
 @ stdcall ExitThread(long)
 @ stub ExitVDM

dlls/kernel32/process.c

@@ -4292,6 +4292,16 @@ BOOL WINAPI EnterUmsSchedulingMode(UMS_SCHEDULER_STARTUP_INFO *info)
     return FALSE;
 }
 
+/***********************************************************************
+ *           ExecuteUmsThread   (KERNEL32.@)
+ */
+BOOL WINAPI ExecuteUmsThread(PUMS_CONTEXT ctx)
+{
+    FIXME( "%p: stub\n", ctx );
+    SetLastError( ERROR_CALL_NOT_IMPLEMENTED );
+    return FALSE;
+}
+
 /**********************************************************************
  *           BaseFlushAppcompatCache     (KERNEL32.@)
  */

include/winbase.h

@@ -1957,6 +1957,7 @@ WINADVAPI  BOOL        WINAPI EqualPrefixSid(PSID,PSID);
 WINBASEAPI DWORD       WINAPI EraseTape(HANDLE,DWORD,BOOL);
 WINBASEAPI VOID DECLSPEC_NORETURN WINAPI ExitProcess(DWORD);
 WINBASEAPI VOID DECLSPEC_NORETURN WINAPI ExitThread(DWORD);
+WINBASEAPI BOOL        WINAPI ExecuteUmsThread(PUMS_CONTEXT);
 WINBASEAPI DWORD       WINAPI ExpandEnvironmentStringsA(LPCSTR,LPSTR,DWORD);
 WINBASEAPI DWORD       WINAPI ExpandEnvironmentStringsW(LPCWSTR,LPWSTR,DWORD);
 #define                       ExpandEnvironmentStrings WINELIB_NAME_AW(ExpandEnvironmentStrings)