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72 lines
2.3 KiB
72 lines
2.3 KiB
/* ----------------------------------------------------------------------------
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* SchedMCore - A MultiCore Scheduling Framework
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* Copyright (C) 2009-2011, ONERA, Toulouse, FRANCE - LIFL, Lille, FRANCE
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*
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* This file is part of Prelude
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*
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* Prelude is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation ; either version 2 of
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* the License, or (at your option) any later version.
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*
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* Prelude is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY ; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program ; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*---------------------------------------------------------------------------- */
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#ifndef com_patterns_H_
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#define com_patterns_H_
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// Description of communication protocols using ultimately periodic
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// words: prefix.(periodic pattern). Each communication uses a circular
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// buffer shared between the writer and the reader.
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// The task instance i writes to the communication buffer iff proto[n]
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// is true (modulo the size of the periodic word). After each write, the
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// index where the writer writes is incremented.
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struct write_proto_t {
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int* write_pref;
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int wpref_size;
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int* write_pat;
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int wpat_size;
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};
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// The task instance n must increment the index at which the task reads
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// in the communication buffer iff proto[n] is true (modulo the size of the
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// periodic word).
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struct read_proto_t {
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int* change_pref;
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int rpref_size;
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int* change_pat;
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int rpat_size;
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};
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/**
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* Returns 1 if instance n must write in the com buffer.
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*/
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static inline int must_write(struct write_proto_t wp, int n)
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{
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if(n < wp.wpref_size)
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return wp.write_pref[n];
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else
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return wp.write_pat[(n-wp.wpref_size)%wp.wpat_size];
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}
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/**
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* Returns 1 if instance n must change the cell from which it reads.
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*/
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static inline int must_change(struct read_proto_t rp, int n)
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{
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if(n < rp.rpref_size)
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return rp.change_pref[n];
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else
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return rp.change_pat[(n-rp.rpref_size)%rp.rpat_size];
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}
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#endif
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