2 This file is a part of libcds - Concurrent Data Structures library
4 (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2016
6 Source code repo: http://github.com/khizmax/libcds/
7 Download: http://sourceforge.net/projects/libcds/files/
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions are met:
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13 list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 this list of conditions and the following disclaimer in the documentation
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19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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31 #ifndef CDSLIB_ALGO_FLAT_COMBINING_DEFS_H
32 #define CDSLIB_ALGO_FLAT_COMBINING_DEFS_H
34 #include <cds/algo/atomic.h>
37 namespace cds { namespace algo { namespace flat_combining {
39 /// Special values of \p publication_record::nRequest
42 req_EmptyRecord, ///< Publication record is empty
43 req_Response, ///< Operation is done
45 req_Operation ///< First operation id for derived classes
48 /// \p publication_record state
50 inactive, ///< Record is inactive
51 active, ///< Record is active
52 removed ///< Record should be removed
55 /// Record of publication list
57 Each data structure based on flat combining contains a class derived from \p %publication_record
59 struct publication_record {
60 atomics::atomic<unsigned int> nRequest; ///< Request field (depends on data structure)
61 atomics::atomic<unsigned int> nState; ///< Record state: inactive, active, removed
62 atomics::atomic<unsigned int> nAge; ///< Age of the record
63 atomics::atomic<publication_record *> pNext; ///< Next record in publication list
64 void * pOwner; ///< [internal data] Pointer to \ref kernel object that manages the publication list
66 /// Initializes publication record
68 : nRequest( req_EmptyRecord )
75 /// Returns the value of \p nRequest field
76 unsigned int op( atomics::memory_order mo = atomics::memory_order_relaxed ) const
78 return nRequest.load( mo );
81 /// Checks if the operation is done
84 return nRequest.load( atomics::memory_order_relaxed ) == req_Response;
89 }}} // namespace cds::algo::flat_combining
91 #endif // CDSLIB_ALGO_FLAT_COMBINING_DEFS_H