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+/* reducer_impl.h                  -*-C++-*-
+ *
+ *************************************************************************
+ *
+ *  @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.
+ **************************************************************************/
+
+/**
+ * @file reducer_impl.h
+ *
+ * @brief Functions to implement reducers in the runtime.
+ */
+
+#ifndef INCLUDED_REDUCER_IMPL_DOT_H
+#define INCLUDED_REDUCER_IMPL_DOT_H
+
+#include <cilk/common.h>
+#include <internal/abi.h>
+#include "rts-common.h"
+
+__CILKRTS_BEGIN_EXTERN_C
+
+/**
+ * Construct an empty reducer map from the memory pool associated with the
+ * given worker.  This reducer map must be destroyed before the worker's
+ * associated global context is destroyed.
+ *
+ * @param w __cilkrts_worker the cilkred_map is being created for.
+ *
+ * @return Pointer to the initialized cilkred_map.
+ */
+COMMON_SYSDEP
+cilkred_map *__cilkrts_make_reducer_map(__cilkrts_worker *w);
+
+/**
+ * Destroy a reducer map.  The map must have been allocated from the worker's
+ * global context and should have been allocated from the same worker.
+ *
+ * @param w __cilkrts_worker the cilkred_map was created for.
+ * @param h The cilkred_map to be deallocated.
+ */
+COMMON_SYSDEP
+void __cilkrts_destroy_reducer_map(__cilkrts_worker *w,
+                                   cilkred_map *h);
+
+/**
+ * Set the specified reducer map as the leftmost map if is_leftmost is true,
+ * otherwise, set it to not be the leftmost map.
+ *
+ * @param h The cilkred_map to be modified.
+ * @param is_leftmost true if the reducer map is leftmost.
+ */
+COMMON_SYSDEP
+void __cilkrts_set_leftmost_reducer_map(cilkred_map *h,
+                                        int is_leftmost);
+
+/**
+ * Merge reducer map RIGHT_MAP into LEFT_MAP and return the result of the
+ * merge.  Both maps must be allocated from the global context associated
+ * with the specified worker.  The returned reducer map must be destroyed
+ * before the worker's associated global context is destroyed.
+ *
+ * If two cilkred_maps are specified, one will be destroyed and the other
+ * one will be returned as the merged cilkred_map.
+ *
+ * When reducers can contain nested parallelism, execution can return
+ * on a different worker than when it started (but still using the
+ * same stack).
+ *
+ * Upon return, *w_ptr stores the pointer to the worker that execution
+ * returns on.
+ *
+ * @param w_ptr      Pointer to the currently executing worker.
+ * @param left_map   The left cilkred_map.
+ * @param right_map  The right cilkred_map.
+ *                  
+ * @return pointer to merged cilkred_map.
+ */
+extern
+cilkred_map *merge_reducer_maps(__cilkrts_worker **w_ptr,
+				cilkred_map *left_map,
+				cilkred_map *right_map);
+
+/**
+ * Similar to merge_reducer_maps(), except that after merging
+ * RIGHT_MAP into LEFT_MAP, it repeatedly merges (*w_ptr)->reducer_map
+ * into LEFT_MAP.  This procedure ensures that any new reducers
+ * created by the reductions themselves also get merged into LEFT_MAP.
+ */ 
+extern
+cilkred_map *repeated_merge_reducer_maps(__cilkrts_worker **w_ptr,
+					 cilkred_map *left_map,
+					 cilkred_map *right_map);
+
+__CILKRTS_END_EXTERN_C
+
+#endif // ! defined(INCLUDED_REDUCER_IMPL_DOT_H)