new file mode 100644
--- /dev/null
+++ b/packages/language/c/libc/current/src/support/mainthread.cxx
@@ -0,0 +1,122 @@
+//=======================================================================
+//
+//      mainthread.cxx
+//
+//      Support for startup of ISO C environment
+//
+//========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// 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 Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):     jlarmour
+// Contributors:  jlarmour
+// Date:          1999-01-21
+// 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.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_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
+class cyg_libc_dummy_constructor_class {
+public:
+    cyg_libc_dummy_constructor_class(void) { ++cyg_hal_stop_constructors; }
+};
+
+static cyg_libc_dummy_constructor_class cyg_libc_dummy_constructor_obj
+                                            CYG_INIT_PRIORITY(PREDEFAULT);
+#endif
+
+// override stack size on some platforms
+#ifdef CYGNUM_HAL_STACK_SIZE_TYPICAL
+# if CYGNUM_LIBC_MAIN_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_TYPICAL
+#  undef CYGNUM_LIBC_MAIN_STACK_SIZE
+#  define CYGNUM_LIBC_MAIN_STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL
+# endif
+#endif
+
+// Make this weak so that users can override this from their own code
+// if they really want. FIXME: but its still allocated
+cyg_uint8 cyg_libc_main_stack[ CYGNUM_LIBC_MAIN_STACK_SIZE ]
+                                                        CYGBLD_ATTRIB_WEAK;
+
+// 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_WEAK CYG_INIT_PRIORITY(LIBC) =
+     Cyg_Thread(CYG_SCHED_DEFAULT_INFO,
+                &cyg_libc_invoke_main, (CYG_ADDRWORD) 0,
+                "main",
+                (CYG_ADDRESS) &cyg_libc_main_stack,
+                CYGNUM_LIBC_MAIN_STACK_SIZE);
+
+#endif // ifdef CYGSEM_LIBC_STARTUP_MAIN_THREAD
+
+// EOF mainthread.cxx