new file mode 100644
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+++ b/packages/language/c/libc/startup/current/src/mainthread.cxx
@@ -0,0 +1,125 @@
+//=======================================================================
+//
+//      mainthread.cxx
+//
+//      Support for startup of ISO C environment
+//
+//========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):     jlarmour
+// Contributors:  
+// Date:          2000-04-30
+// Purpose:       Provides a thread object to call into a user-supplied
+//                main()
+// Description:   Here we define the thread object that calls
+//                cyg_libc_invoke_main() which in turn will invoke
+//                the user-supplied main() entry point function (or
+//                alternatively the dummy empty one supplied by eCos)
+// Usage:         Both the stack (cyg_libc_main_stack) and the thread
+//                (cyg_libc_main_thread) can be overriden if you provide
+//                your own symbols with those names. In the case of the
+//                stack obviously you need to ensure
+//                CYGNUM_LIBC_MAIN_STACK_SIZE corresponds to your own
+//                stack.
+//                The thread object is also available externally if you
+//                want to control it (suspend/resume/etc.) either by
+//                extern Cyg_Thread cyg_libc_main_thread; from C++, using
+//                the kernel C++ API, or
+//                extern cyg_handle_t cyg_libc_main_thread; from C using
+//                the kernel C API.
+//
+//####DESCRIPTIONEND####
+//
+//========================================================================
+
+// CONFIGURATION
+
+#include <pkgconf/libc_startup.h>          // C library configuration
+
+#ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
+
+// INCLUDES
+
+#include <cyg/infra/cyg_type.h>    // Common type definitions and support
+#include <pkgconf/kernel.h>        // eCos kernel configuration
+#include <cyg/kernel/thread.hxx>   // eCos thread support
+#include <cyg/kernel/thread.inl>
+#include <cyg/hal/hal_arch.h>      // for CYGNUM_HAL_STACK_SIZE_TYPICAL
+
+
+// EXTERNS
+
+#ifdef CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
+extern cyg_bool cyg_hal_stop_constructors;
+#endif
+
+// FUNCTION PROTOTYPES
+
+externC void
+cyg_libc_invoke_main( CYG_ADDRWORD );
+
+// STATICS
+
+#ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
+
+// override stack size on some platforms
+#ifdef CYGNUM_HAL_STACK_SIZE_TYPICAL
+# if CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_TYPICAL
+#  undef CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE
+#  define CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
+# endif
+#endif
+
+static cyg_uint8 cyg_libc_main_stack[ CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE ];
+
+#else // !ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
+
+extern char *cyg_libc_main_stack;
+extern int cyg_libc_main_stack_size;
+
+#endif // !ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
+
+// GLOBALS
+
+// let the main thread be global so people can play with it (e.g. suspend
+// or resume etc.) if that's what they want to do
+Cyg_Thread cyg_libc_main_thread CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_LIBC) =
+    Cyg_Thread(CYGNUM_LIBC_MAIN_THREAD_PRIORITY,
+                &cyg_libc_invoke_main, (CYG_ADDRWORD) 0,
+                "main",
+                (CYG_ADDRESS) &cyg_libc_main_stack[0],
+#ifdef CYGSEM_LIBC_MAIN_STACK_FROM_SYSTEM
+                CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE
+#else
+                cyg_libc_main_stack_size
+#endif
+              );
+
+#endif // ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
+
+// EOF mainthread.cxx