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diff --git a/libcilkrts/include/cilk/cilk_undocumented.h b/libcilkrts/include/cilk/cilk_undocumented.h
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+++ b/libcilkrts/include/cilk/cilk_undocumented.h
@@ -0,0 +1,131 @@
+/*
+ *  @copyright
+ *  Copyright (C) 2009-2013, Intel Corporation
+ *  All rights reserved.
+ *  
+ *  @copyright
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *  
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *  
+ *  @copyright
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ *  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ *  WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ *
+ * cilk_undocumented.h
+ *
+ * This file defines exported functions that are not included in the standard
+ * documentation.
+ */
+
+#ifndef INCLUDED_CILK_UNDOCUMENTED_H
+#define INCLUDED_CILK_UNDOCUMENTED_H
+
+#include <cilk/common.h>
+
+#ifndef CILK_STUB
+
+__CILKRTS_BEGIN_EXTERN_C
+
+/*
+ * __cilkrts_synched
+ *
+ * Allows an application to determine if there are any outstanding children at
+ * this instant. This function will examine the current full frame to
+ * determine this. This function will return a valid result only when called
+ * within a spawn continuation, within the stack frame of the continuation
+ * itself.
+ */
+
+CILK_EXPORT __CILKRTS_NOTHROW
+int __cilkrts_synched(void);
+
+/*
+ * __cilkrts_cilkscreen_puts
+ *
+ * Allows an application to write a string to the Cilkscreen log.
+ * The standard error stream will be flushed after the write.
+ */
+
+CILK_EXPORT __CILKRTS_NOTHROW
+void __cilkrts_cilkscreen_puts(const char *);
+
+/*
+ * __cilkrts_get_sf
+ *
+ * A debugging aid that allows an application to get the __cilkrts_stack_frame
+ * for the current function.  Only compiled into the DLL in debug builds.
+ */
+
+CILK_EXPORT __CILKRTS_NOTHROW
+void *__cilkrts_get_sf(void);
+
+/**
+ * Returns the size of stacks created by Cilk.
+ */
+CILK_EXPORT __CILKRTS_NOTHROW
+size_t __cilkrts_get_stack_size(void);
+
+/** 
+ * Dumps runtime statistics to stderr.
+ * Undocumented API for debugging. 
+ */
+CILK_EXPORT __CILKRTS_NOTHROW
+void __cilkrts_dump_stats(void);
+
+CILK_EXPORT __CILKRTS_NOTHROW
+int __cilkrts_irml_version(void);
+
+struct __cilk_tbb_unwatch_thunk;
+struct __cilk_tbb_stack_op_thunk;
+
+CILK_EXPORT __CILKRTS_NOTHROW
+int __cilkrts_watch_stack(struct __cilk_tbb_unwatch_thunk *u,
+                          struct __cilk_tbb_stack_op_thunk o);
+
+#ifndef IN_CILK_RUNTIME
+#ifdef _WIN32
+/* Do not use CILK_API because __cilkrts_worker_stub must be __stdcall */
+CILK_EXPORT unsigned __CILKRTS_NOTHROW __stdcall
+__cilkrts_worker_stub(void *arg);
+#else
+/* Do not use CILK_API because __cilkrts_worker_stub have default visibility */
+CILK_EXPORT void* __CILKRTS_NOTHROW
+__cilkrts_worker_stub(void *arg);
+#endif /* _WIN32 */
+#endif /* IN_CILK_RUNTIME */
+
+__CILKRTS_END_EXTERN_C
+
+#else /* CILK_STUB */
+
+/* Stubs for the api functions */
+
+#define __cilkrts_get_stack_size() (0)
+#define __cilkrts_synched() (1)
+
+#endif /* CILK_STUB */
+
+#endif /* INCLUDED_CILK_UNDOCUMENTED_H */